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morphic.js

Uploaded on Oct 08 2021 02:59 by w.g.ross999

/*

morphic.js

a lively Web-GUI
inspired by Squeak

written by Jens Mönig
jens@moenig.org

Copyright (C) 2010-2021 by Jens Mönig

This file is part of Snap!.

Snap! is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as
published by the Free Software Foundation, either version 3 of
the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.


documentation contents
----------------------
I. inheritance hierarchy
II. object definition toc
III. yet to implement
IV. open issues
V. browser compatibility
VI. the big picture
VII. programming guide
(1) setting up a web page
(a) single world
(b) multiple worlds
(c) an application
(2) manipulating morphs
(3) events
(a) mouse events
(b) context menu
(c) dragging
(d) dropping
(e) keyboard events
(f) resize event
(g) combined mouse-keyboard events
(h) text editing events
(4) stepping
(5) creating new kinds of morphs
(a) drawing the shape
(b) determining extent and arranging submorphs
(c) pixel-perfect pointing events
(d) caching the shape
(e) holes
(f) updating
(g) duplicating
(6) development and user modes
(7) turtle graphics
(8) supporting high-resolution "retina" screens
(9 animations
(10) minifying morphic.js
VIII. acknowledgements
IX. contributors


I. hierarchy
-------------
the following tree lists all constructors hierarchically,
indentation indicating inheritance. Refer to this list to get a
contextual overview:

Animation
Color
Node
Morph
BlinkerMorph
CursorMorph
BouncerMorph*
BoxMorph
InspectorMorph
MenuMorph
MouseSensorMorph*
SpeechBubbleMorph
CircleBoxMorph
SliderButtonMorph
SliderMorph
ColorPaletteMorph
GrayPaletteMorph
ColorPickerMorph
DialMorph
FrameMorph
ScrollFrameMorph
ListMorph
StringFieldMorph
WorldMorph
HandleMorph
HandMorph
PenMorph
ShadowMorph
StringMorph
TextMorph
TriggerMorph
MenuItemMorph
Point
Rectangle


II. toc
-------
the following list shows the order in which all constructors are
defined. Use this list to locate code in this document:

Global settings
Global functions

Animation
Color
Point
Rectangle
Node
Morph
ShadowMorph
HandleMorph
PenMorph
ColorPaletteMorph
GrayPaletteMorph
ColorPickerMorph
BlinkerMorph
CursorMorph
BoxMorph
SpeechBubbleMorph
DialMorph
CircleBoxMorph
SliderButtonMorph
SliderMorph
MouseSensorMorph*
InspectorMorph
MenuMorph
StringMorph
TextMorph
TriggerMorph
MenuItemMorph
FrameMorph
ScrollFrameMorph
ListMorph
StringFieldMorph
BouncerMorph*
HandMorph
WorldMorph

* included only for demo purposes


III. yet to implement
---------------------
- keyboard support for scroll frames and lists
- virtual keyboard support for Android


IV. open issues
----------------
- clipboard support (copy & paste) for non-textual data


V. browser compatibility
------------------------
I have taken great care and considerable effort to make morphic.js
runnable and appearing exactly the same on all current browsers
available to me:

- Firefox for Windows
- Firefox for Mac
- Firefox for Android
- Chrome for Windows
- Chrome for Mac
- Chrome for Android
- Safari for Windows (deprecated)
- safari for Mac
- Safari for iOS (mobile)
- IE for Windows (partial support)
- Edge for Windows
- Opera for Windows
- Opera for Mac


VI. the big picture
-------------------
Morphic.js is completely based on Canvas and JavaScript, it is just
Morphic, nothing else. Morphic.js is very basic and covers only the
bare essentials:

* a stepping mechanism (a time-sharing multiplexer for lively
user interaction ontop of a single OS/browser thread)
* progressive display updates (only dirty rectangles are
redrawn at each display cycle)
* a tree structure
* a single World per Canvas element (although you can have
multiple worlds in multiple Canvas elements on the same web
page)
* a single Hand per World (but you can support multi-touch
events)
* a single text entry focus per World

In its current state morphic.js doesn't support transforms (you
cannot rotate Morphs), but with PenMorph there already is a simple
LOGO-like turtle that you can use to draw onto any Morph it is
attached to. I'm planning to add special Morphs that support these
operations later on, but not for every Morph in the system.
Therefore these additions ("sprites" etc.) are likely to be part of
other libraries ("microworld.js") in separate files.

the purpose of morphic.js is to provide a malleable framework that
will let me experiment with lively GUIs for my hobby horse, which
is drag-and-drop, blocks based programming languages. Those things
(BYOB4 - http://byob.berkeley.edu) will be written using morphic.js
as a library.


VII. programming guide
----------------------
Morphic.js provides a library for lively GUIs inside single HTML
Canvas elements. Each such canvas element functions as a "world" in
which other visible shapes ("morphs") can be positioned and
manipulated, often directly and interactively by the user. Morphs
are tree nodes and may contain any number of submorphs ("children").

All things visible in a morphic World are morphs themselves, i.e.
all text rendering, blinking cursors, entry fields, menus, buttons,
sliders, windows and dialog boxes etc. are created with morphic.js
rather than using HTML DOM elements, and as a consequence can be
changed and adjusted by the programmer regardless of proprietary
browser behavior.

Each World has an - invisible - "Hand" resembling the mouse cursor
(or the user's finger on touch screens) which handles mouse events,
and may also have a keyboard focus to handle key events.

The basic idea of Morphic is to continuously run display cycles and
to incrementally update the screen by only redrawing those World
regions which have been "dirtied" since the last redraw. Before
each shape is processed for redisplay it gets the chance to perform
a "step" procedure, thus allowing for an illusion of concurrency.


(1) setting up a web page
-------------------------
Setting up a web page for Morphic always involves three steps:
adding one or more Canvas elements, defining one or more worlds,
initializing and starting the main loop.


(a) single world
-----------------
Most commonly you will want your World to fill the browsers's whole
client area. This default situation is easiest and most straight
forward.

example html file:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Morphic!</title>
<script type="text/javascript" src="morphic.js"></script>
<script type="text/javascript">
var world;

window.onload = function () {
world = new WorldMorph(document.getElementById('world'));
world.isDevMode = true;
loop();
};

function loop() {
requestAnimationFrame(loop);
world.doOneCycle();
}
</script>
</head>
<body style="margin: 0;">
<canvas id="world" tabindex="1" width="800" height="600"
style="position: absolute;"></canvas>
</body>
</html>

if you use ScrollFrames or otherwise plan to support mouse wheel
scrolling events, make sure to add the following inline-CSS
attribute to the Canvas element:

style="position: absolute;"

which will prevent the World to be scrolled around instead of the
elements inside of it in some browsers.


(b) multiple worlds
-------------------
If you wish to create a web page with more than one world, make
sure to prevent each world from auto-filling the whole page and
include it in the main loop. It's also a good idea to give each
world its own tabindex:

example html file:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Morphic!</title>
<script type="text/javascript" src="morphic.js"></script>
<script type="text/javascript">
var world1, world2;

window.onload = function () {
disableRetinaSupport();
world1 = new WorldMorph(
document.getElementById('world1'), false);
world2 = new WorldMorph(
document.getElementById('world2'), false);
loop();
};

function loop() {
requestAnimationFrame(loop);
world1.doOneCycle();
world2.doOneCycle();
}
</script>
</head>
<body>
<p>first world:</p>
<canvas id="world1" tabindex="1" width="600" height="400"></canvas>
<p>second world:</p>
<canvas id="world2" tabindex="2" width="400" height="600"></canvas>
</body>
</html>


(c) an application
-------------------
Of course, most of the time you don't want to just plain use the
standard Morphic World "as is" out of the box, but write your own
application (something like Scratch!) in it. For such an
application you'll create your own morph prototypes, perhaps
assemble your own "window frame" and bring it all to life in a
customized World state. the following example creates a simple
snake-like mouse drawing game.

example html file:

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>touch me!</title>
<script type="text/javascript" src="morphic.js"></script>
<script type="text/javascript">
var worldCanvas, sensor;

window.onload = function () {
var x, y, w, h;

worldCanvas = document.getElementById('world');
world = new WorldMorph(worldCanvas);
world.isDevMode = false;
world.setColor(new Color());

w = 100;
h = 100;

x = 0;
y = 0;

while ((y * h) < world.height()) {
while ((x * w) < world.width()) {
sensor = new MouseSensorMorph();
sensor.setPosition(new Point(x * w, y * h));
sensor.alpha = 0;
sensor.setExtent(new Point(w, h));
world.add(sensor);
x += 1;
}
x = 0;
y += 1;
}
loop();
};

function loop() {
requestAnimationFrame(loop);
world.doOneCycle();
}
</script>
</head>
<body bgcolor='black' style="margin: 0;">
<canvas id="world" width="800" height="600"
style="position: absolute;"></canvas>
</body>
</html>

To get an idea how you can craft your own custom morph prototypes
I've included two examples which should give you an idea how to add
properties, override inherited methods and use the stepping
mechanism for "livelyness":

BouncerMorph
MouseSensorMorph

For the sake of sharing a single file I've included those examples
in morphic.js itself. Usually you'll define your additions in a
separate file and keep morphic.js untouched.


(2) manipulating morphs
-----------------------
There are many methods to programmatically manipulate morphs. Among
the most important and common ones among all morphs are the
following nine:

* hide()
* show()

* setPosition(aPoint)
* setExtent(aPoint)
* setColor(aColor)

* add(submorph) - attaches submorph ontop
* addBack(submorph) - attaches submorph underneath

* fullCopy() - duplication
* destroy() - deletion


(3) events
----------
All user (and system) interaction is triggered by events, which are
passed on from the root element - the World - to its submorphs. The
World contains a list of system (browser) events it reacts to in its

initEventListeners()

method. Currently there are

- mouse
- drop
- keyboard
- (window) resize

events.

These system events are dispatched within the morphic World by the
World's Hand and its keyboardFocus (usually the active text
cursor).


(a) mouse events:
-----------------
The Hand dispatches the following mouse events to relevant morphs:

mouseDownLeft
mouseDownRight
mouseClickLeft
mouseClickRight
mouseDoubleClick
mouseEnter
mouseLeave
mouseEnterDragging
mouseLeaveDragging
mouseEnterBounds
mouseLeaveBounds
mouseMove
mouseScroll

If you wish your morph to react to any such event, simply add a
method of the same name as the event, e.g:

MyMorph.prototype.mouseMove = function(pos) {};

Most of these methods have as optional parameter a Point object
indicating the current position of the Hand inside the World's
coordinate system. The

mouseMove(pos, button)

event method has an additional optional parameter indicating the
currently pressed mouse button, which is either 'left' or 'right'.
You can use this to let users interact with 3D environments.

The

mouseEnterDragging(morph)
mouseLeaveDragging(morph)
mouseEnterBounds(morph)
mouseLeaveBounds(morph)

event methods have as optional parameter the morph currently dragged by
the Hand, if any.

Events may be "bubbled" up a morph's owner chain by calling

this.escalateEvent(functionName, arg)

in the event handler method's code.

Likewise, removing the event handler method will render your morph
passive to the event in question.


(b) context menu:
-----------------
By default right-clicking (or single-finger tap-and-hold) on a morph
also invokes its context menu (in addition to firing the
mouseClickRight event). A morph's context menu can be customized by
assigning a Menu instance to its

customContextMenu

property, or altogether suppressed by overriding its inherited

contextMenu()

method.


(c) dragging:
-------------
Dragging a morph is initiated when the left mouse button is pressed,
held and the mouse is moved.

You can control whether a morph is draggable by setting its

isDraggable

property either to false or true. If a morph isn't draggable itself
it will pass the pick-up request up its owner chain. This lets you
create draggable composite morphs like Windows, DialogBoxes,
Sliders etc.

Sometimes it is desireable to make "template" shapes which cannot be
moved themselves, but from which instead duplicates can be peeled
off. This is especially useful for building blocks in construction
kits, e.g. the MIT-Scratch palette. Morphic.js lets you control this
functionality by setting the

isTemplate

property flag to true for any morph whose "isDraggable" property is
turned off. When dragging such a Morph the hand will instead grab
a duplicate of the template whose "isDraggable" flag is true and
whose "isTemplate" flag is false, in other words: a non-template.

When creating a copy from a template, the copy's

reactToTemplateCopy

is invoked, if it is present.

Dragging is indicated by adding a drop shadow to the morph in hand.
If a morph follows the hand without displaying a drop shadow it is
merely being moved about without changing its parent (owner morph),
e.g. when "dragging" a morph handle to resize its owner, or when
"dragging" a slider button.

Right before a morph is picked up its

selectForEdit

and

prepareToBeGrabbed(handMorph)

methods are invoked, each if it is present. the optional

selectForEdit

if implemented, must return the object that is to be picked up.
In addition to just returning the original object chosen by the user
your method can also modify the target's environment and instead return
a copy of the selected morph if, for example, you would like to implement
a copy-on-write mechanism such as in Snap.

Immediately after the pick-up the former parent's

reactToGrabOf(grabbedMorph)

method is called, again only if it exists.

Similar to events, these methods are optional and don't exist by
default. For a simple example of how they can be used to adjust
scroll bars in a scroll frame please have a look at their
implementation in FrameMorph.


(d) dropping:
-------------
Dropping is triggered when the left mouse button is either pressed
or released while the Hand is dragging a morph.

Dropping a morph causes it to become embedded in a new owner morph.
You can control this embedding behavior by setting the prospective
drop target's

acceptsDrops

property to either true or false, or by overriding its inherited

wantsDropOf(aMorph)

method.

Right before dropping a morph the designated new parent's optional

selectForEdit

method is invoked if it is present. Again, if implemented this method
must return the new parent for the morph that is about to be dropped.
Again, in addition to just returning the designeted drop-target
your method can also modify its environment and instead return
a copy of the new parent if, for example, you would like to implement
a copy-on-write mechanism such as in Snap.

Right after a morph has been dropped its

justDropped(handMorph)

method is called, and its new parent's

reactToDropOf(droppedMorph, handMorph)

method is invoked, again only if each method exists.

Similar to events, these methods are optional and by default are
not present in morphs by default (watch out for inheritance,
though!). For a simple example of how they can be used to adjust
scroll bars in a scroll frame please have a look at their
implementation in FrameMorph.

Drops of image elements from outside the world canvas are dispatched as

droppedImage(aCanvas, name)
droppedSVG(anImage, name)

events to interested Morphs at the mouse pointer. If you want your Morph
to e.g. import outside images you can add the droppedImage() and / or the
droppedSVG() methods to it. The parameter passed to the event handles is
a new offscreen canvas element representing a copy of the original image
element which can be directly used, e.g. by assigning it to another
Morph's cachedImage property. In the case of a dropped SVG it is an image
element (not a canvas), which has to be rasterized onto a canvas before
it can be used. The benefit of handling SVGs as image elements is that
rasterization can be deferred until the destination scale is known, taking
advantage of SVG's ability for smooth scaling. If instead SVGs are to be
rasterized right away, you can set the

MorphicPreferences.rasterizeSVGs

preference to <true>. In this case dropped SVGs also trigger the
droppedImage() event with a canvas containing a rasterized version of the
SVG.

The same applies to drops of audio or text files from outside the world
canvas.

Those are dispatched as

droppedAudio(anAudio, name)
droppedText(aString, name, type)

events to interested Morphs at the mouse pointer.

if none of the above content types can be determined, the file contents
is dispatched as an ArrayBuffer to interested Morphs:

droppedBinary(anArrayBuffer, name)

In case multiple files are dropped simulateneously the events

beginBulkDrop()
endBulkDrop()

are dispatched to to Morphs interested in bracketing the bulk operation,
and the endBulkDrop() event is only signalled after the contents last file
has been asynchronously made available.


(e) keyboard events
-------------------
The World dispatches the following key events to its active
keyboard focus:

keypress
keydown
keyup

Currently the only morphs which acts as keyboard focus are
CursorMorph - the basic text editing widget - and MenuMorph elements.
If you wish to add keyboard support to your morph you need to add event
handling methods for

processKeyPress(event)
processKeyDown(event)
processKeyUp(event)

and activate them by assigning your morph to the World's

keyboardFocus

property.

Note that processKeyUp() is optional and doesn't have to be present
if your morph doesn't require it.


(f) resize event
----------------
The Window resize event is handled by the World and allows the
World's extent to be adjusted so that it always completely fills
the browser's visible page. You can turn off this default behavior
by setting the World's

useFillPage

property to false.

Alternatively you can also initialize the World with the
useFillPage switch turned off from the beginning by passing the
false value as second parameter to the World's constructor:

world = new World(aCanvas, false);

Use this when creating a web page with multiple Worlds.

if "useFillPage" is turned on the World dispatches an

reactToWorldResize(newBounds)

events to all of its children (toplevel only), allowing each to
adjust to the new World bounds by implementing a corresponding
method, the passed argument being the World's new dimensions after
completing the resize. By default, the "reactToWorldResize" Method
does not exist.

Example:

Add the following method to your Morph to let it automatically
fill the whole World, but leave a 10 pixel border uncovered:

MyMorph.prototype.reactToWorldResize = function (rect) {
this.changed();
this.bounds = rect.insetBy(10);
this.rerender();
};


(g) combined mouse-keyboard events
----------------------------------
Occasionally you'll want an object to react differently to a mouse
click or to some other mouse event while the user holds down a key
on the keyboard. Such "shift-click", "ctl-click", or "alt-click"
events can be implemented by querying the World's

currentKey

property inside the function that reacts to the mouse event. This
property stores the keyCode of the key that's currently pressed.
Once the key is released by the user it reverts to null.


(h) text editing events
-----------------------
Much of Morphic's "liveliness" comes out of allowing text elements
(instances of either single-lined StringMorph or multi-lined TextMorph)
to be directly manipulated and edited by users. This requires other
objects which may have an interest in the text element's state to react
appropriately. Therefore text elements and their manipulators emit
a stream of events, mostly by "bubbling" them up the text element's
owner chain. Text elements' parents are notified about the following
events:

Whenever the user presses a key on the keyboard while a text element
is being edited, first a

reactToKeystroke(event)

is escalated up its parent chain, the "event" parameter being the
original one received by the World.

Whenever the input changes, by adding or removing one or more characters,
an additional

reactToInput(event)

is escalated up its parent chain, the "event" parameter again being the
original one received by the World or by the IME element.

Note that the "reactToKeystroke" event gets triggered before the input
changes, and thus befgore the "reactToInput" event fires.

Once the user has completed the edit, the following events are
dispatched:

accept() - <enter> was pressed on a single line of text
cancel() - <esc> was pressed on any text element

Note that "accept" only gets triggered by single-line texte elements,
as the <enter> key is used to insert line breaks in multi-line
elements. Therefore, whenever a text edit is terminated by the user
(accepted, cancelled or otherwise),

reactToEdit(StringOrTextMorph)

is triggered.

If the MorphicPreference's

useSliderForInput

setting is turned on, a slider is popped up underneath the currently
edited text element letting the user insert numbers out of the given
slider range. Whenever this happens, i.e. whenever the slider is moved
or while the slider button is pressed, a stream of

reactToSliderEdit(StringOrTextMorph)

events is dispatched, allowing for "Bret-Victor" style "scrubbing"
applications.

In addition to user-initiated events text elements also emit
change notifications to their direct parents whenever their contents
changes. That way complex Morphs containing text elements
get a chance to react if something about the embedded text has been
modified programmatically. These events are:

layoutChanged() - sent only from instances of TextMorph
fixLayout() - sent from instances of all Morphs, including StringMorphs

they are different so that Morphs which contain both multi-line and
single-line text elements can hold them apart.


(4) stepping
------------
Stepping is what makes Morphic "magical". Two properties control
a morph's stepping behavior: the fps attribute and the step()
method.

By default the

step()

method does nothing. As you can see in the examples of BouncerMorph
and MouseSensorMorph you can easily override this inherited method
to suit your needs.

By default the step() method is called once per display cycle.
Depending on the number of actively stepping morphs and the
complexity of your step() methods this can cause quite a strain on
your CPU, and also result in your application behaving differently
on slower computers than on fast ones.

setting

myMorph.fps

to a number lower than the interval for the main loop lets you free
system resources (albeit at the cost of a less responsive or slower
behavior for this particular morph).


(5) creating new kinds of morphs
--------------------------------
The real fun begins when you start to create new kinds of morphs
with customized shapes. Imagine, e.g. jigsaw puzzle pieces or
musical notes.

When you create your own morphs, you'll want to think about how to
graphically render it, how to determine its size and whether it needs
to arrange any other parts ("submorphs). There are also ways to specify
its collision detection behavior and define "untouchable" regions
("holes").


(a) drawing the shape
---------------------
For this you have to override the default

render(ctx)

method.

This method draws the morph's shape using a given 2d graphics context.
Note that any coordinates used in the render() method must be relative
to the morph's own position, i.e. you don't need to worry about
translating the shape yourself.

You can use the following template for a start:

MyMorph.prototype.render = function(ctx) {
ctx.fillStyle = this.color.toString();
ctx.fillRect(0, 0, this.width(), this.height());
};

it renders the morph as a solid rectangle completely filling its
area with its current color.

Notice how the coordinates for the fillRect() call are relative
to the morph's own position: The rendered rectangle's origin is always
located at (0, 0) regardless of the morph's actual position in the World.


(b) determining extent and arranging submorphs
----------------------------------------------
If your new morph also needs to determine its extent and, e.g. to
encompass one or several other morphs, or arrange the layout of its
submorphs, make sure to also override the default

fixLayout()

method.

NOTE: If you need to set the morph's extent inside, in order to avoid
infinite recursion instead of calling morph.setExtent() - which will
in turn call morph.fixLayout() again - directly modify the morph's

bounds

property. Bounds is a rectable on which you can also use the same
size-setters, e.g. by calling:

this.bounds.setExtent()


(c) pixel-perfect pointing events
---------------------------------
In case your new morph needs to support pixel-perfect collision detection
with other morphs or pointing devices such as the mouse or a stylus you
can set the inherited attribute

isFreeForm = bool

to "true" (default is "false"). This makes sense the more your morph's
visual shape diverges from a rectangle. For example, if you create a
circular filled morph the default setting will register mouse-events
anywhere within its bounding box, e.g. also in the transparent parts
between the bounding box's corners outside of the circle's bounds.
Instead you can specify your irregulary shaped morph to only register
pointing events (mouse and touch) on solid, non-transparent parts.

Notice, however, that such pixel-perfect collision detection might
strain processing resources, especially if applied liberally.

In order to mitigate unfavorable processor loads for pixel-perfect
collision deteciton of irregularly shaped morphs there are two strategies
to consider: Caching the shape and specifying "untouchable" regions.


(d) caching the shape
---------------------
In case of pixel-perfect free-form collision detection it makes sense to
cache your morph's current shape, so it doesn't have to be re-drawn onto a
new Canvas element every time the mouse moves over its bounding box.
For this you can set then inherited

isCachingImage = bool

attribute to "true" instead of the default "false" value. This will
significantly speed up collision detection and smoothen animations that
continuously perform collision detection. However, it will also consume
more memory. Therefore it's best to use this setting with caution.

Snap! caches the shapes of sprites but not those of blocks. Instead it
manages the insides of C- and E-shaped blocks through the morphic "holes"
mechanism.


(e) holes
---------
An alternative albeit not as precise and general way for handling
irregularly shaped morphs with "untouchable" regions is to specify a set
of rectangular areas in which pointing events (mouse or touch) are not
registered.

By default the inherited

holes = []

property is an empty array. You can add one or more morphic Rectangle
objects to this list, representing regions, in which occurring events will
instead be passed on to the morph underneath.

Note that, same with the render() method, the coordinates of these
rectangular holes must be specified relative to your morph's position.

If you specify holes you might find the need to adjust their layout
depending on the layout of your morph. To accomplish this you can override
the inherited

fixHolesLayout()

method.


(f) updating
------------
One way for morphs to become alive is form them to literally "morph" their
shape depending on whicher contest you wish them to react to. For example,
you might want the user to interactively draw a shape using their fingers
on a touch screen device, or you want the user to be able to "pinch" or
otherwise distort a shape interactively. In all of these situations you'll
want your morph to frequently rerender its shape.

You can accomplish this, by calling

rerender()

after every change to your morph's appearance that requires rerendering.

Such changes are usually only happening when the morph's dimensions or
other visual properties - such as its color - changes.


(g) duplicating
---------------
If your new morph stores or references to other morphs outside of
the submorph tree in other properties, be sure to also override the
default

updateReferences()

method if you want it to support duplication.


(6) development and user modes
------------------------------
When working with Squeak on Scratch or BYOB among the features I
like the best and use the most is inspecting what's going on in
the World while it is up and running. That's what development mode
is for (you could also call it debug mode). In essence development
mode controls which context menu shows up. In user mode right
clicking (or double finger tapping) a morph invokes its

customContextMenu

property, whereas in development mode only the general

developersMenu()

method is called and the resulting menu invoked. The developers'
menu features Gui-Builder-wise functionality to directly inspect,
take apart, reassamble and otherwise manipulate morphs and their
contents.

Instead of using the "customContextMenu" property you can also
assign a more dynamic contextMenu by overriding the general

userMenu()

method with a customized menu constructor. The difference between
the customContextMenu property and the userMenu() method is that
the former is also present in development mode and overrides the
developersMenu() result. For an example of how to use the
customContextMenu property have a look at TextMorph's evaluation
menu, which is used for the Inspector's evaluation pane.

When in development mode you can inspect every Morph's properties
with the inspector, including all of its methods. The inspector
also lets you add, remove and rename properties, and even edit
their values at runtime. Like in a Smalltalk environment the inspect
features an evaluation pane into which you can type in arbitrary
JavaScript code and evaluate it in the context of the inspectee.

Use switching between user and development modes while you are
developing an application and disable switching to development once
you're done and deploying, because generally you don't want to
confuse end-users with inspectors and meta-level stuff.


(7) turtle graphics
-------------------

The basic Morphic kernel features a simple LOGO turtle constructor
called

PenMorph

which you can use to draw onto its parent Morph. By default every
Morph in the system (including the World) is able to act as turtle
canvas and can display pen trails. Pen trails will be lost whenever
the trails morph (the pen's parent) performs a "render()"
operation. If you want to create your own pen trails canvas, you
may wish to modify its

penTrails()

property, so that it keeps a separate offscreen canvas for pen
trails (and doesn't loose these on redraw).

the following properties of PenMorph are relevant for turtle
graphics:

color - a Color
size - line width of pen trails
heading - degrees
isDown - drawing state

the following commands can be used to actually draw something:

up() - lift the pen up, further movements leave no trails
down() - set down, further movements leave trails
clear() - remove all trails from the current parent
forward(n) - move n steps in the current direction (heading)
turn(n) - turn right n degrees

Turtle graphics can best be explored interactively by creating a
new PenMorph object and by manipulating it with the inspector
widget.

NOTE: PenMorph has a special optimization for recursive operations
called

warp(function)

You can significantly speed up recursive ops and increase the depth
of recursion that's displayable by wrapping WARP around your
recursive function call:

example:

myPen.warp(function () {
myPen.tree(12, 120, 20);
})

will be much faster than just invoking the tree function, because it
prevents the parent's parent from keeping track of every single line
segment and instead redraws the outcome in a single pass.


(8) supporting high-resolution "retina" screens
-----------------------------------------------
By default retina support gets installed when Morphic.js loads. There
are two global functions that let you test for retina availability:

isRetinaSupported() - Bool, answers if retina support is available
isRetinaEnabled() - Bool, answers if currently in retina mode

and two more functions that let you control retina support if it is
available:

enableRetinaSupport()
disableRetinaSupport()

Both of these internally test whether retina is available, so they are
safe to call directly. For an example how to make retina support
user-specifiable refer to

Snap! >> guis.js >> toggleRetina()

Even when in retina mode it often makes sense to use normal-resolution
canvasses for simple shapes in order to save system resources and
optimize performance. Examples are costumes and backgrounds in Snap.
In Morphic you can create new canvas elements using

newCanvas(extentPoint [, nonRetinaFlag])

If retina support is enabled such new canvasses will automatically be
high-resolution canvasses, unless the newCanvas() function is given an
otherwise optional second Boolean <true> argument that explicitly makes
it a non-retina canvas.

Not the whole canvas API is supported by Morphic's retina utilities.
Especially if your code uses putImageData() you will want to "downgrade"
a target high-resolution canvas to a normal-resolution ("non-retina")
one before using

normalizeCanvas(aCanvas [, copyFlag])

This will change the target canvas' resolution in place (!). If you
pass in the optional second Boolean <true> flag the function returns
a non-retina copy and leaves the target canvas unchanged. An example
of this normalize mechanism is converting the penTrails layer of Snap's
stage (high-resolution) into a sprite-costume (normal resolution).


(9) animations
---------------
Animations handle gradual transitions between one state and another over a
period of time. Transition effects can be specified using easing functions.
An easing function maps a fraction of the transition time to a fraction of
the state delta. This way accelerating / decelerating and bouncing sliding
effects can be accomplished.

Animations are generic and not limited to motion, i.e. they can also handle
other transitions such as color changes, transparency fadings, growing,
shrinking, turning etc.

Animations need to be stepped by a scheduler, e. g. an interval function.
In Morphic the preferred way to run an animation is to register it with
the World by adding it to the World's animation queue. The World steps each
registered animation once per display cycle independently of the Morphic
stepping mechanism.

For an example how to use animations look at how the Morph's methods

glideTo()
fadeTo()

and

slideBackTo()

are implemented.


(10) minifying morphic.js
-------------------------
Coming from Smalltalk and being a Squeaker at heart I am a huge fan
of browsing the code itself to make sense of it. Therefore I have
included this documentation and (too little) inline comments so all
you need to get going is this very file.

Nowadays with live streaming HD video even on mobile phones 250 KB
shouldn't be a big strain on bandwith, still minifying and even
compressing morphic.js down do about 100 KB may sometimes improve
performance in production use.

Being an attorney-at-law myself you programmer folk keep harassing
me with rabulistic nitpickings about free software licenses. I'm
releasing morphic.js under an AGPL license. Therefore please make
sure to adhere to that license in any minified or compressed version.


VIII. acknowledgements
----------------------
The original Morphic was designed and written by Randy Smith and
John Maloney for the SELF programming language, and later ported to
Squeak (Smalltalk) by John Maloney and Dan Ingalls, who has also
ported it to JavaScript (the Lively Kernel), once again setting
a "Gold Standard" for self sustaining systems which morphic.js
cannot and does not aspire to meet.

This Morphic implementation for JavaScript is not a direct port of
Squeak's Morphic, but still many individual functions have been
ported almost literally from Squeak, sometimes even including their
comments, e.g. the morph duplication mechanism fullCopy(). Squeak
has been a treasure trove, and if morphic.js looks, feels and
smells a lot like Squeak, I'll take it as a compliment.

Evelyn Eastmond has inspired and encouraged me with her wonderful
implementation of DesignBlocksJS. Thanks for sharing code, ideas
and enthusiasm for programming.

John Maloney has been my mentor and my source of inspiration for
these Morphic experiments. Thanks for the critique, the suggestions
and explanations for all things Morphic and for being my all time
programming hero.

I have originally written morphic.js in Florian Balmer's Notepad2
editor for Windows, later switched to Apple's Dashcode and later
still to Apple's Xcode. I've also come to depend on both Douglas
Crockford's JSLint and later the JSHint project, as well as on
Mozilla's Firebug and Google's Chrome to get it right.


IX. contributors
----------------------
Joe Otto found and fixed many early bugs and taught me some tricks.
Nathan Dinsmore contributed mouse wheel scrolling, cached
background texture handling, countless bug fixes and optimizations.
Ian Reynolds contributed backspace key handling for Chrome.
Davide Della Casa contributed performance optimizations for Firefox.
Jason N (@cyderize) contributed native copy & paste for text editing.
Bartosz Leper contributed retina display support.
Zhenlei Jia and Dariusz Doro┼╝alski pioneered IME text editing.
Bernat Romagosa contributed to text editing and to the core design.
Michael Ball found and fixed a longstanding scrolling bug.
Brian Harvey contributed to the design and implementation of submenus.
Ken Kahn contributed to Chinese keboard entry and Android support.
Brian Broll contributed clickable URLs in text elements and many bugfixes.

- Jens Mönig
*/

// Global settings /////////////////////////////////////////////////////

/*global window, HTMLCanvasElement, FileReader, Audio, FileList, Map*/

/*jshint esversion: 6*/

var morphicVersion = '2021-July-09';
var modules = {}; // keep track of additional loaded modules
var useBlurredShadows = true;

const ZERO = new Point();
const BLACK = new Color();
const WHITE = new Color(255, 255, 255);
const CLEAR = new Color(0, 0, 0, 0);

Object.freeze(ZERO);
Object.freeze(BLACK);
Object.freeze(WHITE);

var standardSettings = {
minimumFontHeight: getMinimumFontHeight(), // browser settings
globalFontFamily: '',
menuFontName: 'sans-serif',
menuFontSize: 12,
bubbleHelpFontSize: 10,
prompterFontName: 'sans-serif',
prompterFontSize: 12,
prompterSliderSize: 10,
handleSize: 15,
scrollBarSize: 9, // was 12,
mouseScrollAmount: 40,
useSliderForInput: false,
isTouchDevice: false, // turned on by touch events, don't set
rasterizeSVGs: false,
isFlat: false,
grabThreshold: 5,
showHoles: false
};

var touchScreenSettings = {
minimumFontHeight: standardSettings.minimumFontHeight,
globalFontFamily: '',
menuFontName: 'sans-serif',
menuFontSize: 24,
bubbleHelpFontSize: 18,
prompterFontName: 'sans-serif',
prompterFontSize: 24,
prompterSliderSize: 20,
handleSize: 26,
scrollBarSize: 24,
mouseScrollAmount: 40,
useSliderForInput: false,
isTouchDevice: true,
rasterizeSVGs: false,
isFlat: false,
grabThreshold: 5,
showHoles: false
};

var MorphicPreferences = standardSettings;

// first, try enabling support for retina displays - can be turned off later

/*
Support for retina displays has been pioneered and contributed by
Bartosz Leper.

NOTE: this will make changes to the HTMLCanvasElement that - mostly -
make Morphic usable on retina displays in very high resolution mode
with crisp fonts and clear fine lines without you (the programmer)
needing to know any specifics, provided both the display and the browser
support these (Safari currently doesn't), otherwise these utilities will
not be installed.
If you don't want your Morphic application to support retina resolutions
you don't have to edit this morphic.js file to comment out the next line
of code, instead you can simply call

disableRetinaSupport();

before you create your World(s) in the html page. Disabling retina
support also will simply do nothing if retina support is not possible
or already disabled, so it's equally safe to call.

For an example how to make retina support user-specifiable refer to
Snap! >> guis.js >> toggleRetina()
*/

enableRetinaSupport();

// Global Functions ////////////////////////////////////////////////////

function nop() {
// do explicitly nothing
return null;
}

function localize(string) {
// override this function with custom localizations
return string;
}

function isNil(thing) {
return thing === undefined || thing === null;
}

function contains(list, element) {
// answer true if element is a member of list
return list.indexOf(element) !== -1;
}

function detect(list, predicate) {
// answer the first element of list for which predicate evaluates
// true, otherwise answer null
var i, size = list.length;
for (i = 0; i < size; i += 1) {
if (predicate.call(null, list[i])) {
return list[i];
}
}
return null;
}

function sizeOf(object) {
// answer the number of own properties
var size = 0, key;
for (key in object) {
if (Object.prototype.hasOwnProperty.call(object, key)) {
size += 1;
}
}
return size;
}

function isString(target) {
return typeof target === 'string' || target instanceof String;
}

function isObject(target) {
return target !== null &&
(typeof target === 'object' || target instanceof Object);
}

function radians(degrees) {
return degrees * Math.PI / 180;
}

function degrees(radians) {
return radians * 180 / Math.PI;
}

function fontHeight(height) {
var minHeight = Math.max(height, MorphicPreferences.minimumFontHeight);
return minHeight * 1.2; // assuming 1/5 font size for ascenders
}

function isWordChar(aCharacter) {
// can't use \b or \w because they ignore diacritics
return aCharacter.match(/[A-zÀ-ÿ0-9]/);
}

function isURLChar(aCharacter) {
return aCharacter.match(/[A-z0-9./:?&_+%-]/);
}

function isURL(text) {
return /^https?:\/\//.test(text);
}

function newCanvas(extentPoint, nonRetina, recycleMe) {
// answer a new empty instance of Canvas, don't display anywhere
// nonRetina - optional Boolean "false"
// by default retina support is automatic
// optional existing canvas to be used again, unless it is marked as
// being shared among Morphs (dataset property "morphicShare")
var canvas, ext;
nonRetina = nonRetina || false;
ext = (extentPoint ||
(recycleMe ? new Point(recycleMe.width, recycleMe.height)
: new Point(0, 0))).ceil();
if (recycleMe &&
!recycleMe.dataset.morphicShare &&
(recycleMe.isRetinaEnabled || false) !== nonRetina &&
ext.x === recycleMe.width && ext.y === recycleMe.height
) {
canvas = recycleMe;
canvas.getContext("2d").clearRect(0, 0, canvas.width, canvas.height);
return canvas;
} else {
canvas = document.createElement('canvas');
canvas.width = ext.x;
canvas.height = ext.y;
}
if (nonRetina && canvas.isRetinaEnabled) {
canvas.isRetinaEnabled = false;
}
return canvas;
}

function copyCanvas(aCanvas) {
// answer a deep copy of a canvas element respecting its retina status
var c;
if (aCanvas && aCanvas.width && aCanvas.height) {
c = newCanvas(
new Point(aCanvas.width, aCanvas.height),
!aCanvas.isRetinaEnabled
);
c.getContext("2d").drawImage(aCanvas, 0, 0);
return c;
}
return aCanvas;
}

function getMinimumFontHeight() {
// answer the height of the smallest font renderable in pixels
var str = 'I',
size = 50,
canvas = document.createElement('canvas'),
ctx,
maxX,
data,
x,
y;
canvas.width = size;
canvas.height = size;
ctx = canvas.getContext('2d');
ctx.font = '1px serif';
maxX = ctx.measureText(str).width;
ctx.fillStyle = 'black';
ctx.textBaseline = 'bottom';
ctx.fillText(str, 0, size);
for (y = 0; y < size; y += 1) {
for (x = 0; x < maxX; x += 1) {
data = ctx.getImageData(x, y, 1, 1);
if (data.data[3] !== 0) {
return size - y + 1;
}
}
}
return 0;
}

function getDocumentPositionOf(aDOMelement) {
// answer the relative coordinates of a DOM element in the viewport
var rect = aDOMelement.getBoundingClientRect(),
scrollLeft = window.pageXOffset || document.documentElement.scrollLeft,
scrollTop = window.pageYOffset || document.documentElement.scrollTop;
return {x: rect.left + scrollLeft, y:rect.top + scrollTop};
}

function copy(target) {
// answer a shallow copy of target
var value, c, property, keys, l, i;
if (typeof target !== 'object') {
return target;
}
value = target.valueOf();
if (target !== value) {
return new target.constructor(value);
}
if (target instanceof target.constructor &&
target.constructor !== Object) {
c = Object.create(target.constructor.prototype);
keys = Object.keys(target);
for (l = keys.length, i = 0; i < l; i += 1) {
property = keys[i];
if (target[property] instanceof HTMLCanvasElement) {
// tag canvas elements as being shared,
// so the next time when rerendering a Morph
// instead of recycling the shared canvas a
// new unshared one get created
// see newCanvas() function
target[property].dataset.morphicShare = 'true';
}
c[property] = target[property];
}
} else {
c = {};
for (property in target) {
c[property] = target[property];
}
}
return c;
}

// Retina Display Support //////////////////////////////////////////////

/*
By default retina support gets installed when Morphic.js loads. There
are two global functions that let you test for retina availability:

isRetinaSupported() - Boolean, whether retina support is available
isRetinaEnabled() - Boolean, whether currently in retina mode

and two more functions that let you control retina support if it is
available:

enableRetinaSupport()
disableRetinaSupport()

Both of these internally test whether retina is available, so they are
safe to call directly.

Even when in retina mode it often makes sense to use non-high-resolution
canvasses for simple shapes in order to save system resources and
optimize performance. Examples are costumes and backgrounds in Snap.
In Morphic you can create new canvas elements using

newCanvas(extentPoint [, nonRetinaFlag])

If retina support is enabled such new canvasses will automatically be
high-resolution canvasses, unless the newCanvas() function is given an
otherwise optional second Boolean <true> argument that explicitly makes
it a non-retina canvas.

Not the whole canvas API is supported by Morphic's retina utilities.
Especially if your code uses putImageData() you will want to "downgrade"
a target high-resolution canvas to a normal-resolution ("non-retina")
one before using

normalizeCanvas(aCanvas [, copyFlag])

This will change the target canvas' resolution in place (!). If you
pass in the optional second Boolean <true> flag the function returns
a non-retina copy and leaves the target canvas unchanged. An example
of this normalize mechanism is converting the penTrails layer of Snap's
stage (high-resolution) into a sprite-costume (normal resolution).
*/

function enableRetinaSupport() {
/*
=== contributed by Bartosz Leper ===

This installs a series of utilities that allow using Canvas the same way
on retina and non-retina displays. If the display is a retina one, the
underlying dimensions of the Canvas elements are doubled, but this will
be transparent to the code that uses Canvas. All dimensions read or
written to the Canvas element will be scaled appropriately.

NOTE: This implementation is not exhaustive; it only implements what is
needed by the Snap! UI.

[Jens]: like all other retina screen support implementations I've seen
Bartosz's patch also does not address putImageData() compatibility when
mixing retina-enabled and non-retina canvasses. If you need to manipulate
pixels in such mixed canvasses, make sure to "downgrade" them all using
normalizeCanvas() below.
*/

// Get the window's pixel ratio for canvas elements.
// See: http://www.html5rocks.com/en/tutorials/canvas/hidpi/
var ctx = document.createElement("canvas").getContext("2d"),
backingStorePixelRatio = ctx.webkitBackingStorePixelRatio ||
ctx.mozBackingStorePixelRatio ||
ctx.msBackingStorePixelRatio ||
ctx.oBackingStorePixelRatio ||
ctx.backingStorePixelRatio || 1,

// Unfortunately, it's really hard to make this work well when changing
// zoom level, so let's leave it like this right now, and stick to
// whatever the ratio was in the beginning.

// originalDevicePixelRatio = window.devicePixelRatio,

// [Jens]: As of summer 2016 non-integer devicePixelRatios lead to
// artifacts when blitting images onto canvas elements in all browsers
// except Chrome, especially Firefox, Edge, IE (Safari doesn't even
// support retina mode as implemented here).
// therefore - to ensure crisp fonts - use the ceiling of whatever
// the devicePixelRatio is. This needs more memory, but looks nicer.

originalDevicePixelRatio = Math.ceil(window.devicePixelRatio),

canvasProto = HTMLCanvasElement.prototype,
contextProto = CanvasRenderingContext2D.prototype,

// [Jens]: keep track of original properties in a dictionary
// so they can be iterated over and restored
uber = {
drawImage: contextProto.drawImage,
getImageData: contextProto.getImageData,

width: Object.getOwnPropertyDescriptor(
canvasProto,
'width'
),
height: Object.getOwnPropertyDescriptor(
canvasProto,
'height'
),
shadowOffsetX: Object.getOwnPropertyDescriptor(
contextProto,
'shadowOffsetX'
),
shadowOffsetY: Object.getOwnPropertyDescriptor(
contextProto,
'shadowOffsetY'
),
shadowBlur: Object.getOwnPropertyDescriptor(
contextProto,
'shadowBlur'
)
};

// [Jens]: only install retina utilities if the display supports them
if (backingStorePixelRatio === originalDevicePixelRatio) {return; }
// [Jens]: check whether properties can be overridden, needed for Safari
if (Object.keys(uber).some(any => {
var prop = uber[any];
return prop.hasOwnProperty('configurable') && (!prop.configurable);
})) {return; }

function getPixelRatio(imageSource) {
return imageSource.isRetinaEnabled ?
(originalDevicePixelRatio || 1) / backingStorePixelRatio : 1;
}

canvasProto._isRetinaEnabled = true;
// [Jens]: remember the original non-retina properties,
// so they can be restored again
canvasProto._bak = uber;

Object.defineProperty(canvasProto, 'isRetinaEnabled', {
get: function() {
return this._isRetinaEnabled;
},
set: function(enabled) {
var prevPixelRatio = getPixelRatio(this),
prevWidth = this.width,
prevHeight = this.height;

this._isRetinaEnabled = enabled;
if (getPixelRatio(this) != prevPixelRatio) {
this.width = prevWidth;
this.height = prevHeight;
}
},
configurable: true // [Jens]: allow to be deleted an reconfigured
});

Object.defineProperty(canvasProto, 'width', {
get: function() {
return uber.width.get.call(this) / getPixelRatio(this);
},
set: function(width) {
try { // workaround one of FF's dreaded NS_ERROR_FAILURE bugs
// this should be taken out as soon as FF gets fixed again
var pixelRatio = getPixelRatio(this),
context;
uber.width.set.call(this, width * pixelRatio);
context = this.getContext('2d');
/*
context.restore();
context.save();
*/
context.scale(pixelRatio, pixelRatio);
} catch (err) {
console.log('Retina Display Support Problem', err);
uber.width.set.call(this, width);
}
}
});

Object.defineProperty(canvasProto, 'height', {
get: function() {
return uber.height.get.call(this) / getPixelRatio(this);
},
set: function(height) {
var pixelRatio = getPixelRatio(this),
context;
uber.height.set.call(this, height * pixelRatio);
context = this.getContext('2d');
/*
context.restore();
context.save();
*/
context.scale(pixelRatio, pixelRatio);
}
});

contextProto.drawImage = function(image) {
var pixelRatio = getPixelRatio(image),
sx, sy, sWidth, sHeight, dx, dy, dWidth, dHeight;

// Different signatures of drawImage() method have different
// parameter assignments.
switch (arguments.length) {
case 9:
sx = arguments[1];
sy = arguments[2];
sWidth = arguments[3];
sHeight = arguments[4];
dx = arguments[5];
dy = arguments[6];
dWidth = arguments[7];
dHeight = arguments[8];
break;

case 5:
sx = 0;
sy = 0;
sWidth = image.width;
sHeight = image.height;
dx = arguments[1];
dy = arguments[2];
dWidth = arguments[3];
dHeight = arguments[4];
break;

case 3:
sx = 0;
sy = 0;
sWidth = image.width;
sHeight = image.height;
dx = arguments[1];
dy = arguments[2];
dWidth = image.width;
dHeight = image.height;
break;

default:
throw Error('Called drawImage() with ' + arguments.length +
' arguments');
}
uber.drawImage.call(
this, image,
sx * pixelRatio, sy * pixelRatio,
sWidth * pixelRatio, sHeight * pixelRatio,
dx, dy,
dWidth, dHeight);
};

contextProto.getImageData = function(sx, sy, sw, sh) {
var pixelRatio = getPixelRatio(this.canvas);
return uber.getImageData.call(
this,
sx * pixelRatio, sy * pixelRatio,
sw * pixelRatio, sh * pixelRatio);
};

Object.defineProperty(contextProto, 'shadowOffsetX', {
get: function() {
return uber.shadowOffsetX.get.call(this) /
getPixelRatio(this.canvas);
},
set: function(offset) {
var pixelRatio = getPixelRatio(this.canvas);
uber.shadowOffsetX.set.call(this, offset * pixelRatio);
}
});

Object.defineProperty(contextProto, 'shadowOffsetY', {
get: function() {
return uber.shadowOffsetY.get.call(this) /
getPixelRatio(this.canvas);
},
set: function(offset) {
var pixelRatio = getPixelRatio(this.canvas);
uber.shadowOffsetY.set.call(this, offset * pixelRatio);
}
});

Object.defineProperty(contextProto, 'shadowBlur', {
get: function() {
return uber.shadowBlur.get.call(this) /
getPixelRatio(this.canvas);
},
set: function(blur) {
var pixelRatio = getPixelRatio(this.canvas);
uber.shadowBlur.set.call(this, blur * pixelRatio);
}
});
}

function isRetinaSupported () {
var ctx = document.createElement("canvas").getContext("2d"),
backingStorePixelRatio = ctx.webkitBackingStorePixelRatio ||
ctx.mozBackingStorePixelRatio ||
ctx.msBackingStorePixelRatio ||
ctx.oBackingStorePixelRatio ||
ctx.backingStorePixelRatio || 1,
canvasProto = HTMLCanvasElement.prototype,
contextProto = CanvasRenderingContext2D.prototype,
uber = {
drawImage: contextProto.drawImage,
getImageData: contextProto.getImageData,

width: Object.getOwnPropertyDescriptor(
canvasProto,
'width'
),
height: Object.getOwnPropertyDescriptor(
canvasProto,
'height'
),
shadowOffsetX: Object.getOwnPropertyDescriptor(
contextProto,
'shadowOffsetX'
),
shadowOffsetY: Object.getOwnPropertyDescriptor(
contextProto,
'shadowOffsetY'
),
shadowBlur: Object.getOwnPropertyDescriptor(
contextProto,
'shadowBlur'
)
};
return backingStorePixelRatio !== window.devicePixelRatio &&
!(Object.keys(uber).some(any => {
var prop = uber[any];
return prop.hasOwnProperty('configurable') && (!prop.configurable);
})
);
}

function isRetinaEnabled () {
return HTMLCanvasElement.prototype.hasOwnProperty('_isRetinaEnabled');
}

function disableRetinaSupport() {
// uninstalls Retina utilities. Make sure to re-create every Canvas
// element afterwards
var canvasProto, contextProto, uber;
if (!isRetinaEnabled()) {return; }
canvasProto = HTMLCanvasElement.prototype;
contextProto = CanvasRenderingContext2D.prototype;
uber = canvasProto._bak;
Object.defineProperty(canvasProto, 'width', uber.width);
Object.defineProperty(canvasProto, 'height', uber.height);
contextProto.drawImage = uber.drawImage;
contextProto.getImageData = uber.getImageData;
Object.defineProperty(contextProto, 'shadowOffsetX', uber.shadowOffsetX);
Object.defineProperty(contextProto, 'shadowOffsetY', uber.shadowOffsetY);
Object.defineProperty(contextProto, 'shadowBlur', uber.shadowBlur);
delete canvasProto._isRetinaEnabled;
delete canvasProto.isRetinaEnabled;
delete canvasProto._bak;
}

function normalizeCanvas(aCanvas, getCopy) {
// make sure aCanvas is non-retina, otherwise convert it in place (!)
// or answer a normalized copy if the "getCopy" flag is <true>
var cpy;
if (!aCanvas.isRetinaEnabled) {return aCanvas; }
cpy = newCanvas(new Point(aCanvas.width, aCanvas.height), true);
cpy.getContext('2d').drawImage(aCanvas, 0, 0);
if (getCopy) {return cpy; }
aCanvas.isRetinaEnabled = false;
aCanvas.width = cpy.width;
aCanvas.height = cpy.height;
aCanvas.getContext('2d').drawImage(cpy, 0, 0);
return aCanvas;
}

// Animations //////////////////////////////////////////////////////////////

/*
Animations handle gradual transitions between one state and another over a
period of time. Transition effects can be specified using easing functions.
An easing function maps a fraction of the transition time to a fraction of
the state delta. This way accelerating / decelerating and bouncing sliding
effects can be accomplished.

Animations are generic and not limited to motion, i.e. they can also handle
other transitions such as color changes, transparency fadings, growing,
shrinking, turning etc.

Animations need to be stepped by a scheduler, e. g. an interval function.
In Morphic the preferred way to run an animation is to register it with
the World by adding it to the World's animation queue. The World steps each
registered animation once per display cycle independently of the Morphic
stepping mechanism.

For an example how to use animations look at how the Morph's methods

glideTo()
fadeTo()

and

slideBackTo()

are implemented.
*/

// Animation instance creation:

function Animation(setter, getter, delta, duration, easing, onComplete) {
this.setter = setter; // function
this.getter = getter; // function
this.delta = delta || 0; // number
this.duration = duration || 0; // milliseconds
this.easing = isString(easing) ? // string or function
this.easings[easing] || this.easings.sinusoidal
: easing || this.easings.sinusoidal;
this.onComplete = onComplete || null; // optional callback
this.endTime = null;
this.destination = null;
this.isActive = false;
this.start();
}

Animation.prototype.easings = {
// dictionary of a few pre-defined easing functions used to transition
// two states

// ease both in and out:
linear: t => t,
sinusoidal: t => 1 - Math.cos(radians(t * 90)),
quadratic: t => t < 0.5 ? 2 * t * t : ((4 - (2 * t)) * t) - 1,
cubic: t => {
return t < 0.5 ?
4 * t * t * t
: ((t - 1) * ((2 * t) - 2) * ((2 * t) - 2)) + 1;
},
elastic: t => {
return (t -= 0.5) < 0 ?
(0.01 + 0.01 / t) * Math.sin(50 * t)
: (0.02 - 0.01 / t) * Math.sin(50 * t) + 1;
},

// ease in only:
sine_in: t => 1 - Math.sin(radians(90 + (t * 90))),
quad_in: t => t * t,
cubic_in: t => t * t * t,
elastic_in: t => (0.04 - 0.04 / t) * Math.sin(25 * t) + 1,

// ease out only:
sine_out: t => Math.sin(radians(t * 90)),
quad_out: t => t * (2 - t),
elastic_out: t => 0.04 * t / (--t) * Math.sin(25 * t)
};

Animation.prototype.start = function () {
// (re-) activate the animation, e.g. if is has previously completed,
// make sure to plug it into something that repeatedly triggers step(),
// e.g. the World's animations queue
this.endTime = Date.now() + this.duration;
this.destination = this.getter.call(this) + this.delta;
this.isActive = true;
};

Animation.prototype.step = function () {
if (!this.isActive) {return; }
var now = Date.now();
if (now > this.endTime) {
this.setter(this.destination);
this.isActive = false;
if (this.onComplete) {this.onComplete(); }
} else {
this.setter(
this.destination -
(this.delta * this.easing((this.endTime - now) / this.duration))
);
}
};

// Colors //////////////////////////////////////////////////////////////

// Color instance creation:

function Color(r, g, b, a) {
// all values are optional, just (r, g, b) is fine
this.r = r || 0;
this.g = g || 0;
this.b = b || 0;
this.a = a || ((a === 0) ? 0 : 1);
}

// Color string representation: e.g. 'rgba(255,165,0,1)'

Color.prototype.toString = function () {
return 'rgba(' +
Math.round(this.r) + ',' +
Math.round(this.g) + ',' +
Math.round(this.b) + ',' +
this.a + ')';
};

Color.prototype.toRGBstring = function () {
return 'rgb(' +
Math.round(this.r) + ',' +
Math.round(this.g) + ',' +
Math.round(this.b) + ')';
};

Color.fromString = function (aString) {
// I parse rgb/rgba strings into a Color object
var components = aString.split(/[\(),]/).slice(1,5);
return new Color(components[0], components[1], components[2], components[3]);
};

// Color copying:

Color.prototype.copy = function () {
return new Color(
this.r,
this.g,
this.b,
this.a
);
};

// Color comparison:

Color.prototype.eq = function (aColor, observeAlpha) {
// ==
return aColor &&
this.r === aColor.r &&
this.g === aColor.g &&
this.b === aColor.b &&
(observeAlpha ? this.a === aColor.a : true);
};

Color.prototype.isCloseTo = function (aColor, observeAlpha, tolerance) {
// experimental - answer whether a color is "close" to another one by
// a given percentage. tolerance is the percentage by which each color
// channel may diverge, alpha needs to be the exact same unless ignored
var thres = 2.55 * (tolerance || 10);

function dist(a, b) {
var diff = a - b;
return diff < 0 ? 255 + diff : diff;
}

return aColor &&
dist(this.r, aColor.r) < thres &&
dist(this.g, aColor.g) < thres &&
dist(this.b, aColor.b) < thres &&
(observeAlpha ? this.a === aColor.a : true);
};

// Color conversion (hsv):

Color.prototype.hsv = function () {
// ignore alpha
var max, min, h, s, v, d,
rr = this.r / 255,
gg = this.g / 255,
bb = this.b / 255;
max = Math.max(rr, gg, bb);
min = Math.min(rr, gg, bb);
h = max;
s = max;
v = max;
d = max - min;
s = max === 0 ? 0 : d / max;
if (max === min) {
h = 0;
} else {
switch (max) {
case rr:
h = (gg - bb) / d + (gg < bb ? 6 : 0);
break;
case gg:
h = (bb - rr) / d + 2;
break;
case bb:
h = (rr - gg) / d + 4;
break;
}
h /= 6;
}
return [h, s, v];
};

Color.prototype.set_hsv = function (h, s, v) {
// ignore alpha, h, s and v are to be within [0, 1]
var i, f, p, q, t;
i = Math.floor(h * 6);
f = h * 6 - i;
p = v * (1 - s);
q = v * (1 - f * s);
t = v * (1 - (1 - f) * s);
switch (i % 6) {
case 0:
this.r = v;
this.g = t;
this.b = p;
break;
case 1:
this.r = q;
this.g = v;
this.b = p;
break;
case 2:
this.r = p;
this.g = v;
this.b = t;
break;
case 3:
this.r = p;
this.g = q;
this.b = v;
break;
case 4:
this.r = t;
this.g = p;
this.b = v;
break;
case 5:
this.r = v;
this.g = p;
this.b = q;
break;
}

this.r *= 255;
this.g *= 255;
this.b *= 255;

};

// Color conversion (hsl):

Color.prototype.hsl = function () {
// ignore alpha
var rr = this.r / 255,
gg = this.g / 255,
bb = this.b / 255,
max = Math.max(rr, gg, bb), min = Math.min(rr, gg, bb),
h,
s,
l = (max + min) / 2,
d;
if (max === min) { // achromatic
h = 0;
s = 0;
} else {
d = max - min;
s = l > 0.5 ? d / (2 - max - min) : d / (max + min);
switch (max) {
case rr:
h = (gg - bb) / d + (gg < bb ? 6 : 0);
break;
case gg:
h = (bb - rr) / d + 2;
break;
case bb:
h = (rr - gg) / d + 4;
break;
}
h /= 6;
}
return [h, s, l];
};

Color.prototype.set_hsl = function (h, s, l) {
// ignore alpha, h, s and l are to be within [0, 1]
var q, p;

function hue2rgb(p, q, t) {
if (t < 0) {
t += 1;
}
if (t > 1) {
t -= 1;
}
if (t < 1/6) {
return p + (q - p) * 6 * t;
}
if (t < 1/2) {
return q;
}
if (t < 2/3) {
return p + (q - p) * (2/3 - t) * 6;
}
return p;
}

if (s == 0) { // achromatic
this.r = l;
this.g = l;
this.b = l;
} else {
q = l < 0.5 ? l * (1 + s) : l + s - l * s;
p = 2 * l - q;
this.r = hue2rgb(p, q, h + 1/3);
this.g = hue2rgb(p, q, h);
this.b = hue2rgb(p, q, h - 1/3);
}

this.r *= 255;
this.g *= 255;
this.b *= 255;
};

// Color mixing:

Color.prototype.mixed = function (proportion, otherColor) {
// answer a copy of this color mixed with another color, ignore alpha
var frac1 = Math.min(Math.max(proportion, 0), 1),
frac2 = 1 - frac1;
return new Color(
this.r * frac1 + otherColor.r * frac2,
this.g * frac1 + otherColor.g * frac2,
this.b * frac1 + otherColor.b * frac2
);
};

Color.prototype.darker = function (percent) {
// return an rgb-interpolated darker copy of me, ignore alpha
var fract = 0.8333;
if (percent) {
fract = (100 - percent) / 100;
}
return this.mixed(fract, new Color(0, 0, 0));
};

Color.prototype.lighter = function (percent) {
// return an rgb-interpolated lighter copy of me, ignore alpha
var fract = 0.8333;
if (percent) {
fract = (100 - percent) / 100;
}
return this.mixed(fract, WHITE);
};

Color.prototype.dansDarker = function () {
// return an hsv-interpolated darker copy of me, ignore alpha
var hsv = this.hsv(),
result = new Color(),
vv = Math.max(hsv[2] - 0.16, 0);
result.set_hsv(hsv[0], hsv[1], vv);
return result;
};

Color.prototype.inverted = function () {
return new Color(
255 - this.r,
255 - this.g,
255 - this.b
);
};

Color.prototype.solid = function () {
return new Color(
this.r,
this.g,
this.b
);
};

// Points //////////////////////////////////////////////////////////////

// Point instance creation:

function Point(x, y) {
this.x = x || 0;
this.y = y || 0;
}

// Point string representation: e.g. '12@68'

Point.prototype.toString = function () {
return Math.round(this.x.toString()) +
'@' + Math.round(this.y.toString());
};

// Point copying:

Point.prototype.copy = function () {
return new Point(this.x, this.y);
};

// Point comparison:

Point.prototype.eq = function (aPoint) {
// ==
return this.x === aPoint.x && this.y === aPoint.y;
};

Point.prototype.lt = function (aPoint) {
// <
return this.x < aPoint.x && this.y < aPoint.y;
};

Point.prototype.gt = function (aPoint) {
// >
return this.x > aPoint.x && this.y > aPoint.y;
};

Point.prototype.ge = function (aPoint) {
// >=
return this.x >= aPoint.x && this.y >= aPoint.y;
};

Point.prototype.le = function (aPoint) {
// <=
return this.x <= aPoint.x && this.y <= aPoint.y;
};

Point.prototype.max = function (aPoint) {
return new Point(Math.max(this.x, aPoint.x),
Math.max(this.y, aPoint.y));
};

Point.prototype.min = function (aPoint) {
return new Point(Math.min(this.x, aPoint.x),
Math.min(this.y, aPoint.y));
};

// Point conversion:

Point.prototype.round = function () {
return new Point(Math.round(this.x), Math.round(this.y));
};

Point.prototype.abs = function () {
return new Point(Math.abs(this.x), Math.abs(this.y));
};

Point.prototype.neg = function () {
return new Point(-this.x, -this.y);
};

Point.prototype.mirror = function () {
return new Point(this.y, this.x);
};

Point.prototype.floor = function () {
return new Point(
Math.max(Math.floor(this.x), 0),
Math.max(Math.floor(this.y), 0)
);
};

Point.prototype.ceil = function () {
return new Point(Math.ceil(this.x), Math.ceil(this.y));
};

// Point arithmetic:

Point.prototype.add = function (other) {
if (other instanceof Point) {
return new Point(this.x + other.x, this.y + other.y);
}
return new Point(this.x + other, this.y + other);
};

Point.prototype.subtract = function (other) {
if (other instanceof Point) {
return new Point(this.x - other.x, this.y - other.y);
}
return new Point(this.x - other, this.y - other);
};

Point.prototype.multiplyBy = function (other) {
if (other instanceof Point) {
return new Point(this.x * other.x, this.y * other.y);
}
return new Point(this.x * other, this.y * other);
};

Point.prototype.divideBy = function (other) {
if (other instanceof Point) {
return new Point(this.x / other.x, this.y / other.y);
}
return new Point(this.x / other, this.y / other);
};

Point.prototype.floorDivideBy = function (other) {
if (other instanceof Point) {
return new Point(Math.floor(this.x / other.x),
Math.floor(this.y / other.y));
}
return new Point(Math.floor(this.x / other),
Math.floor(this.y / other));
};

// Point polar coordinates:

Point.prototype.r = function () {
var t = (this.multiplyBy(this));
return Math.sqrt(t.x + t.y);
};

Point.prototype.degrees = function () {
/*
answer the angle I make with origin in degrees.
Right is 0, down is 90
*/
var tan, theta;

if (this.x === 0) {
if (this.y >= 0) {
return 90;
}
return 270;
}
tan = this.y / this.x;
theta = Math.atan(tan);
if (this.x >= 0) {
if (this.y >= 0) {
return degrees(theta);
}
return 360 + (degrees(theta));
}
return 180 + degrees(theta);
};

Point.prototype.theta = function () {
/*
answer the angle I make with origin in radians.
Right is 0, down is 90
*/
var tan, theta;

if (this.x === 0) {
if (this.y >= 0) {
return radians(90);
}
return radians(270);
}
tan = this.y / this.x;
theta = Math.atan(tan);
if (this.x >= 0) {
if (this.y >= 0) {
return theta;
}
return radians(360) + theta;
}
return radians(180) + theta;
};

// Point functions:

Point.prototype.crossProduct = function (aPoint) {
return this.multiplyBy(aPoint.mirror());
};

Point.prototype.distanceTo = function (aPoint) {
return (aPoint.subtract(this)).r();
};

Point.prototype.rotate = function (direction, center) {
// direction must be 'right', 'left' or 'pi'
var offset = this.subtract(center);
if (direction === 'right') {
return new Point(-offset.y, offset.y).add(center);
}
if (direction === 'left') {
return new Point(offset.y, -offset.y).add(center);
}
// direction === 'pi'
return center.subtract(offset);
};

Point.prototype.flip = function (direction, center) {
// direction must be 'vertical' or 'horizontal'
if (direction === 'vertical') {
return new Point(this.x, center.y * 2 - this.y);
}
// direction === 'horizontal'
return new Point(center.x * 2 - this.x, this.y);
};

Point.prototype.distanceAngle = function (dist, angle) {
var deg = angle, x, y;
if (deg > 270) {
deg = deg - 360;
} else if (deg < -270) {
deg = deg + 360;
}
if (-90 <= deg && deg <= 90) {
x = Math.sin(radians(deg)) * dist;
y = Math.sqrt((dist * dist) - (x * x));
return new Point(x + this.x, this.y - y);
}
x = Math.sin(radians(180 - deg)) * dist;
y = Math.sqrt((dist * dist) - (x * x));
return new Point(x + this.x, this.y + y);
};

// Point transforming:

Point.prototype.scaleBy = function (scalePoint) {
return this.multiplyBy(scalePoint);
};

Point.prototype.translateBy = function (deltaPoint) {
return this.add(deltaPoint);
};

Point.prototype.rotateBy = function (angle, centerPoint) {
var center = centerPoint || ZERO,
p = this.subtract(center),
r = p.r(),
theta = angle - p.theta();
return new Point(
center.x + (r * Math.cos(theta)),
center.y - (r * Math.sin(theta))
);
};

// Point conversion:

Point.prototype.asArray = function () {
return [this.x, this.y];
};

// Rectangles //////////////////////////////////////////////////////////

// Rectangle instance creation:

function Rectangle(left, top, right, bottom) {
this.init(new Point((left || 0), (top || 0)),
new Point((right || 0), (bottom || 0)));
}

Rectangle.prototype.init = function (originPoint, cornerPoint) {
this.origin = originPoint;
this.corner = cornerPoint;
};

// Rectangle string representation: e.g. '[0@0 | 160@80]'

Rectangle.prototype.toString = function () {
return '[' + this.origin.toString() + ' | ' +
this.extent().toString() + ']';
};

// Rectangle copying:

Rectangle.prototype.copy = function () {
return new Rectangle(
this.left(),
this.top(),
this.right(),
this.bottom()
);
};

// creating Rectangle instances from Points:

Point.prototype.corner = function (cornerPoint) {
// answer a new Rectangle
return new Rectangle(
this.x,
this.y,
cornerPoint.x,
cornerPoint.y
);
};

Point.prototype.rectangle = function (aPoint) {
// answer a new Rectangle
var org, crn;
org = this.min(aPoint);
crn = this.max(aPoint);
return new Rectangle(org.x, org.y, crn.x, crn.y);
};

Point.prototype.extent = function (aPoint) {
//answer a new Rectangle
var crn = this.add(aPoint);
return new Rectangle(this.x, this.y, crn.x, crn.y);
};

// Rectangle accessing - setting:

Rectangle.prototype.setTo = function (left, top, right, bottom) {
// note: all inputs are optional and can be omitted

this.origin = new Point(
left || ((left === 0) ? 0 : this.left()),
top || ((top === 0) ? 0 : this.top())
);

this.corner = new Point(
right || ((right === 0) ? 0 : this.right()),
bottom || ((bottom === 0) ? 0 : this.bottom())
);
};

// Rectangle mutating

Rectangle.prototype.setExtent = function(aPoint) {
this.setWidth(aPoint.x);
this.setHeight(aPoint.y);
};

Rectangle.prototype.setWidth = function (width) {
this.corner.x = this.origin.x + width;
};

Rectangle.prototype.setHeight = function (height) {
this.corner.y = this.origin.y + height;
};

// Rectangle accessing - getting:

Rectangle.prototype.area = function () {
//requires width() and height() to be defined
var w = this.width();
if (w < 0) {
return 0;
}
return Math.max(w * this.height(), 0);
};

Rectangle.prototype.bottom = function () {
return this.corner.y;
};

Rectangle.prototype.bottomCenter = function () {
return new Point(this.center().x, this.bottom());
};

Rectangle.prototype.bottomLeft = function () {
return new Point(this.origin.x, this.corner.y);
};

Rectangle.prototype.bottomRight = function () {
return this.corner.copy();
};

Rectangle.prototype.boundingBox = function () {
return this;
};

Rectangle.prototype.center = function () {
return this.origin.add(
this.corner.subtract(this.origin).floorDivideBy(2)
);
};

Rectangle.prototype.corners = function () {
return [this.origin,
this.bottomLeft(),
this.corner,
this.topRight()];
};

Rectangle.prototype.extent = function () {
return this.corner.subtract(this.origin);
};

Rectangle.prototype.height = function () {
return this.corner.y - this.origin.y;
};

Rectangle.prototype.left = function () {
return this.origin.x;
};

Rectangle.prototype.leftCenter = function () {
return new Point(this.left(), this.center().y);
};

Rectangle.prototype.right = function () {
return this.corner.x;
};

Rectangle.prototype.rightCenter = function () {
return new Point(this.right(), this.center().y);
};

Rectangle.prototype.top = function () {
return this.origin.y;
};

Rectangle.prototype.topCenter = function () {
return new Point(this.center().x, this.top());
};

Rectangle.prototype.topLeft = function () {
return this.origin;
};

Rectangle.prototype.topRight = function () {
return new Point(this.corner.x, this.origin.y);
};

Rectangle.prototype.width = function () {
return this.corner.x - this.origin.x;
};

Rectangle.prototype.position = function () {
return this.origin;
};

// Rectangle comparison:

Rectangle.prototype.eq = function (aRect) {
return this.origin.eq(aRect.origin) &&
this.corner.eq(aRect.corner);
};

Rectangle.prototype.abs = function () {
var newOrigin, newCorner;

newOrigin = this.origin.abs();
newCorner = this.corner.max(newOrigin);
return newOrigin.corner(newCorner);
};

// Rectangle functions:

Rectangle.prototype.insetBy = function (delta) {
// delta can be either a Point or a Number
var result = new Rectangle();
result.origin = this.origin.add(delta);
result.corner = this.corner.subtract(delta);
return result;
};

Rectangle.prototype.expandBy = function (delta) {
// delta can be either a Point or a Number
var result = new Rectangle();
result.origin = this.origin.subtract(delta);
result.corner = this.corner.add(delta);
return result;
};

Rectangle.prototype.growBy = function (delta) {
// delta can be either a Point or a Number
var result = new Rectangle();
result.origin = this.origin.copy();
result.corner = this.corner.add(delta);
return result;
};

Rectangle.prototype.intersect = function (aRect) {
var result = new Rectangle();
result.origin = this.origin.max(aRect.origin);
result.corner = this.corner.min(aRect.corner);
return result;
};

Rectangle.prototype.merge = function (aRect) {
var result = new Rectangle();
result.origin = this.origin.min(aRect.origin);
result.corner = this.corner.max(aRect.corner);
return result;
};

Rectangle.prototype.mergeWith = function (aRect) {
// mutates myself
this.origin = this.origin.min(aRect.origin);
this.corner = this.corner.max(aRect.corner);
};

Rectangle.prototype.round = function () {
return this.origin.round().corner(this.corner.round());
};

Rectangle.prototype.spread = function () {
// round me by applying floor() to my origin and ceil() to my corner
// avoids artefacts on retina displays
return this.origin.floor().corner(this.corner.ceil());
};

Rectangle.prototype.amountToTranslateWithin = function (aRect) {
/*
Answer a Point, delta, such that self + delta is forced within
aRectangle. when all of me cannot be made to fit, prefer to keep
my topLeft inside. Taken from Squeak.
*/
var dx = 0, dy = 0;

if (this.right() > aRect.right()) {
dx = aRect.right() - this.right();
}
if (this.bottom() > aRect.bottom()) {
dy = aRect.bottom() - this.bottom();
}
if ((this.left() + dx) < aRect.left()) {
dx = aRect.left() - this.left();
}
if ((this.top() + dy) < aRect.top()) {
dy = aRect.top() - this.top();
}
return new Point(dx, dy);
};

Rectangle.prototype.regionsAround = function (aRect) {
// answer a list of rectangles surrounding another one,
// use this to clip "holes"
var regions = [];
if (!this.intersects(aRect)) {
return regions;
}
// left
if (aRect.left() > this.left()) {
regions.push(
new Rectangle(
this.left(),
this.top(),
aRect.left(),
this.bottom()
)
);
}
// above:
if (aRect.top() > this.top()) {
regions.push(
new Rectangle(
this.left(),
this.top(),
this.right(),
aRect.top()
)
);
}
// right:
if (aRect.right() < this.right()) {
regions.push(
new Rectangle(
aRect.right(),
this.top(),
this.right(),
this.bottom()
)
);
}
// below:
if (aRect.bottom() < this.bottom()) {
regions.push(
new Rectangle(
this.left(),
aRect.bottom(),
this.right(),
this.bottom()
)
);
}
return regions;
};

// Rectangle testing:

Rectangle.prototype.containsPoint = function (aPoint) {
return this.origin.le(aPoint) && aPoint.lt(this.corner);
};

Rectangle.prototype.containsRectangle = function (aRect) {
return aRect.origin.gt(this.origin) &&
aRect.corner.lt(this.corner);
};

Rectangle.prototype.intersects = function (aRect) {
var ro = aRect.origin, rc = aRect.corner;
return (rc.x >= this.origin.x) &&
(rc.y >= this.origin.y) &&
(ro.x <= this.corner.x) &&
(ro.y <= this.corner.y);
};

Rectangle.prototype.isNearTo = function (aRect, threshold) {
var ro = aRect.origin, rc = aRect.corner, border = threshold || 0;
return (rc.x + border >= this.origin.x) &&
(rc.y + border >= this.origin.y) &&
(ro.x - border <= this.corner.x) &&
(ro.y - border <= this.corner.y);
};

// Rectangle transforming:

Rectangle.prototype.scaleBy = function (scale) {
// scale can be either a Point or a scalar
var o = this.origin.multiplyBy(scale),
c = this.corner.multiplyBy(scale);
return new Rectangle(o.x, o.y, c.x, c.y);
};

Rectangle.prototype.translateBy = function (delta) {
// delta can be either a Point or a number
var o = this.origin.add(delta),
c = this.corner.add(delta);
return new Rectangle(o.x, o.y, c.x, c.y);
};

// Rectangle converting:

Rectangle.prototype.asArray = function () {
return [this.left(), this.top(), this.right(), this.bottom()];
};

Rectangle.prototype.asArray_xywh = function () {
return [this.left(), this.top(), this.width(), this.height()];
};

// Nodes ///////////////////////////////////////////////////////////////

// Node instance creation:

function Node(parent, childrenArray) {
this.init(parent || null, childrenArray || []);
}

Node.prototype.init = function (parent, childrenArray) {
this.parent = parent || null;
this.children = childrenArray || [];
};

// Node string representation: e.g. 'a Node[3]'

Node.prototype.toString = function () {
return 'a Node' + '[' + this.children.length.toString() + ']';
};

// Node accessing:

Node.prototype.addChild = function (aNode) {
this.children.push(aNode);
aNode.parent = this;
};

Node.prototype.addChildFirst = function (aNode) {
this.children.splice(0, null, aNode);
aNode.parent = this;
};

Node.prototype.removeChild = function (aNode) {
var idx = this.children.indexOf(aNode);
if (idx !== -1) {
this.children.splice(idx, 1);
}
};

// Node functions:

Node.prototype.root = function () {
if (this.parent === null) {
return this;
}
return this.parent.root();
};

Node.prototype.depth = function () {
if (this.parent === null) {
return 0;
}
return this.parent.depth() + 1;
};

Node.prototype.allChildren = function () {
// includes myself
var result = [this];
this.children.forEach(child => {
result = result.concat(child.allChildren());
});
return result;
};

Node.prototype.forAllChildren = function (aFunction) {
if (this.children.length > 0) {
this.children.forEach(child => child.forAllChildren(aFunction));
}
aFunction.call(null, this);
};

Node.prototype.anyChild = function (aPredicate) {
// includes myself
var i;
if (aPredicate.call(null, this)) {
return true;
}
for (i = 0; i < this.children.length; i += 1) {
if (this.children[i].anyChild(aPredicate)) {
return true;
}
}
return false;
};

Node.prototype.allLeafs = function () {
var result = [];
this.allChildren().forEach(element => {
if (element.children.length === 0) {
result.push(element);
}
});
return result;
};

Node.prototype.allParents = function () {
// includes myself
var result = [this];
if (this.parent !== null) {
result = result.concat(this.parent.allParents());
}
return result;
};

Node.prototype.siblings = function () {
if (this.parent === null) {
return [];
}
return this.parent.children.filter(child => child !== this);
};

Node.prototype.parentThatIsA = function () {
// including myself
// Note: you can pass in multiple constructors to test for
var i;
for (i = 0; i < arguments.length; i += 1) {
if (this instanceof arguments[i]) {
return this;
}
}
if (!this.parent) {
return null;
}
return this.parentThatIsA.apply(this.parent, arguments);
};

Node.prototype.parentThatIsAnyOf = function (constructors) {
// deprecated, use parentThatIsA instead
return this.parentThatIsA.apply(this, constructors);
};

// Morphs //////////////////////////////////////////////////////////////

// Morph: referenced constructors

var Morph;
var WorldMorph;
var HandMorph;
var ShadowMorph;
var FrameMorph;
var MenuMorph;
var HandleMorph;
var StringFieldMorph;
var ColorPickerMorph;
var SliderMorph;
var ScrollFrameMorph;
var InspectorMorph;
var StringMorph;
var TextMorph;

// Morph inherits from Node:

Morph.prototype = new Node();
Morph.prototype.constructor = Morph;
Morph.uber = Node.prototype;

// Morph settings:

Morph.prototype.shadowBlur = 4;

// Morph instance creation:

function Morph() {
this.init();
}

// Morph initialization:

Morph.prototype.init = function () {
Morph.uber.init.call(this);
this.isMorph = true; // used to optimize deep copying
this.cachedImage = null;
this.isCachingImage = false;
this.shouldRerender = false;
this.bounds = new Rectangle(0, 0, 50, 40);
this.holes = []; // list of "untouchable" regions (rectangles)
this.color = new Color(80, 80, 80);
this.texture = null; // optional url of a fill-image
this.cachedTexture = null; // internal cache of actual bg image
this.alpha = 1;
this.isVisible = true;
this.isDraggable = false;
this.isTemplate = false;
this.acceptsDrops = false;
this.isFreeForm = false;
this.noDropShadow = false;
this.fullShadowSource = true;
this.fps = 0;
this.customContextMenu = null;
this.lastTime = Date.now();
this.onNextStep = null; // optional function to be run once
};

// Morph string representation: e.g. 'a Morph 2 [20@45 | 130@250]'

Morph.prototype.toString = function () {
return 'a ' +
(this.constructor.name ||
this.constructor.toString().split(' ')[1].split('(')[0]) +
' ' +
this.children.length.toString() + ' ' +
this.bounds;
};

// Morph deleting:

Morph.prototype.destroy = function () {
if (this.parent !== null) {
this.fullChanged();
this.parent.removeChild(this);
}
};

// Morph stepping:

Morph.prototype.stepFrame = function () {
if (!this.step) {
return null;
}
var current, elapsed, leftover, nxt;
current = Date.now();
elapsed = current - this.lastTime;
if (this.fps > 0) {
leftover = (1000 / this.fps) - elapsed;
} else {
leftover = 0;
}
if (leftover < 1) {
this.lastTime = current;
if (this.onNextStep) {
nxt = this.onNextStep;
this.onNextStep = null;
nxt.call(this);
}
this.step();
this.children.forEach(child => child.stepFrame());
}
};

Morph.prototype.nextSteps = function (arrayOfFunctions) {
var lst = arrayOfFunctions || [],
nxt = lst.shift();
if (nxt) {
this.onNextStep = () => {
nxt.call(this);
this.nextSteps(lst);
};
}
};

Morph.prototype.step = nop;

// Morph accessing - geometry getting:

Morph.prototype.left = function () {
return this.bounds.left();
};

Morph.prototype.right = function () {
return this.bounds.right();
};

Morph.prototype.top = function () {
return this.bounds.top();
};

Morph.prototype.bottom = function () {
return this.bounds.bottom();
};

Morph.prototype.center = function () {
return this.bounds.center();
};

Morph.prototype.bottomCenter = function () {
return this.bounds.bottomCenter();
};

Morph.prototype.bottomLeft = function () {
return this.bounds.bottomLeft();
};

Morph.prototype.bottomRight = function () {
return this.bounds.bottomRight();
};

Morph.prototype.boundingBox = function () {
return this.bounds;
};

Morph.prototype.corners = function () {
return this.bounds.corners();
};

Morph.prototype.leftCenter = function () {
return this.bounds.leftCenter();
};

Morph.prototype.rightCenter = function () {
return this.bounds.rightCenter();
};

Morph.prototype.topCenter = function () {
return this.bounds.topCenter();
};

Morph.prototype.topLeft = function () {
return this.bounds.topLeft();
};

Morph.prototype.topRight = function () {
return this.bounds.topRight();
};
Morph.prototype.position = function () {
return this.bounds.origin;
};

Morph.prototype.extent = function () {
return this.bounds.extent();
};

Morph.prototype.width = function () {
return this.bounds.width();
};

Morph.prototype.height = function () {
return this.bounds.height();
};

Morph.prototype.fullBounds = function () {
var result;
result = this.bounds;
this.children.forEach(child => {
if (child.isVisible) {
result = result.merge(child.fullBounds());
}
});
return result;
};

Morph.prototype.fullBoundsNoShadow = function () {
// answer my full bounds but ignore any shadow
var result;
result = this.bounds;
this.children.forEach(child => {
if (!(child instanceof ShadowMorph) && (child.isVisible)) {
result = result.merge(child.fullBounds());
}
});
return result;
};

Morph.prototype.visibleBounds = function () {
// answer which part of me is not clipped by a Frame
var visible = this.bounds,
frames = this.allParents().filter(p => p instanceof FrameMorph);
frames.forEach(f => visible = visible.intersect(f.bounds));
return visible;
};

// Morph accessing - simple changes:

Morph.prototype.moveBy = function (delta) {
var children = this.children,
i = children.length;
this.changed();
this.bounds = this.bounds.translateBy(delta);
this.changed();
for (i; i > 0; i -= 1) {
children[i - 1].moveBy(delta);
}
};

Morph.prototype.setPosition = function (aPoint) {
var delta = aPoint.subtract(this.topLeft());
if (!(delta.eq(ZERO))) {
this.moveBy(delta);
}
};

Morph.prototype.setLeft = function (x) {
this.setPosition(
new Point(
x,
this.top()
)
);
};

Morph.prototype.setRight = function (x) {
this.setPosition(
new Point(
x - this.width(),
this.top()
)
);
};

Morph.prototype.setTop = function (y) {
this.setPosition(
new Point(
this.left(),
y
)
);
};

Morph.prototype.setBottom = function (y) {
this.setPosition(
new Point(
this.left(),
y - this.height()
)
);
};

Morph.prototype.setCenter = function (aPoint) {
this.setPosition(
aPoint.subtract(
this.extent().floorDivideBy(2)
)
);
};

Morph.prototype.setFullCenter = function (aPoint) {
this.setPosition(
aPoint.subtract(
this.fullBounds().extent().floorDivideBy(2)
)
);
};

Morph.prototype.keepWithin = function (aMorph) {
// make sure I am completely within another Morph's bounds
var leftOff, rightOff, topOff, bottomOff;
rightOff = this.fullBounds().right() - aMorph.right();
if (rightOff > 0) {
this.moveBy(new Point(-rightOff, 0));
}
leftOff = this.fullBounds().left() - aMorph.left();
if (leftOff < 0) {
this.moveBy(new Point(-leftOff, 0));
}
bottomOff = this.fullBounds().bottom() - aMorph.bottom();
if (bottomOff > 0) {
this.moveBy(new Point(0, -bottomOff));
}
topOff = this.fullBounds().top() - aMorph.top();
if (topOff < 0) {
this.moveBy(new Point(0, -topOff));
}
};

Morph.prototype.scrollIntoView = function () {
var leftOff, rightOff, topOff, bottomOff,
sf = this.parentThatIsA(ScrollFrameMorph);
if (!sf) {return; }
rightOff = Math.min(
this.fullBounds().right() - sf.right(),
sf.contents.right() - sf.right()
);
if (rightOff > 0) {
sf.contents.moveBy(new Point(-rightOff, 0));
}
leftOff = this.fullBounds().left() - sf.left();
if (leftOff < 0) {
sf.contents.moveBy(new Point(-leftOff, 0));
}
topOff = this.fullBounds().top() - sf.top();
if (topOff < 0) {
sf.contents.moveBy(new Point(0, -topOff));
}
bottomOff = this.fullBounds().bottom() - sf.bottom();
if (bottomOff > 0) {
sf.contents.moveBy(new Point(0, -bottomOff));
}
sf.adjustScrollBars();
};

// Morph accessing - dimensional changes requiring a complete redraw

Morph.prototype.setExtent = function (aPoint) {
if (aPoint.eq(this.extent())) {return; }
this.changed();
this.bounds.setWidth(aPoint.x);
this.bounds.setHeight(aPoint.y);
this.fixLayout();
this.rerender();
};

Morph.prototype.setWidth = function (width) {
this.setExtent(new Point(width || 0, this.height()));
};

Morph.prototype.setHeight = function (height) {
this.setExtent(new Point(this.width(), height || 0));
};

Morph.prototype.setColor = function (aColor) {
if (aColor) {
if (!this.color.eq(aColor)) {
this.color = aColor;
this.rerender();
}
}
};

// Morph rendering:

Morph.prototype.getImage = function () {
var img;
if (this.cachedImage && !this.shouldRerender) {
return this.cachedImage;
}
img = newCanvas(this.extent(), false, this.cachedImage);
if (this.isCachingImage) {
this.cachedImage = img;
}
this.render(img.getContext('2d'));
this.shouldRerender = false;
return img;
};

Morph.prototype.render = function (aContext) {
aContext.fillStyle = this.getRenderColor().toString();
aContext.fillRect(0, 0, this.width(), this.height());
if (this.cachedTexture) {
this.renderCachedTexture(aContext);
} else if (this.texture) {
this.renderTexture(this.texture, aContext);
}
};

Morph.prototype.getRenderColor = function () {
// can be overriden by my heirs or instances
return this.color;
};

Morph.prototype.fixLayout = function () {
// implemented by my heirs
// determine my extent and arrange my submorphs, if any
// default is to do nothing
// NOTE: If you need to set the extent, in order to avoid
// infinite recursion instead of calling setExtent() (which will
// in turn call fixLayout() again) directly modify the bounds
// property, e.g. like this: this.bounds.setExtent()
return;
};

Morph.prototype.fixHolesLayout = function () {
// implemented by my heirs
// arrange my untouchable areas, if any
// default is to do nothing
return;
};

// Morph displaying:

Morph.prototype.renderTexture = function (url, ctx) {
this.cachedTexture = new Image();
this.cachedTexture.onload = () => this.changed();
this.cachedTexture.src = this.texture = url;
};

Morph.prototype.renderCachedTexture = function (ctx) {
var bg = this.cachedTexture,
cols = Math.floor(this.width() / bg.width),
lines = Math.floor(this.height() / bg.height),
x,
y;

ctx.save();
ctx.globalAlpha = this.alpha;
ctx.beginPath();
ctx.rect(0, 0, this.width(), this.height());
ctx.clip();
for (y = 0; y <= lines; y += 1) {
for (x = 0; x <= cols; x += 1) {
ctx.drawImage(bg, x * bg.width, y * bg.height);
}
}
ctx.restore();
};

Morph.prototype.drawOn = function (ctx, rect) {
var clipped = rect.intersect(this.bounds),
pos = this.position(),
pic, src, w, h, sl, st;

if (!clipped.extent().gt(ZERO)) {return; }
ctx.save();
ctx.globalAlpha = this.alpha;
if (this.isCachingImage) {
pic = this.getImage();
src = clipped.translateBy(pos.neg());
sl = src.left();
st = src.top();
w = Math.min(src.width(), pic.width - sl);
h = Math.min(src.height(), pic.height - st);
if (w < 1 || h < 1) {return; }
ctx.drawImage(
pic,
sl,
st,
w,
h,
clipped.left(),
clipped.top(),
w,
h
);
} else { // render directly on target canvas
ctx.beginPath();
ctx.rect(clipped.left(), clipped.top(), clipped.width(), clipped.height());
ctx.clip();
ctx.translate(pos.x, pos.y);
this.render(ctx);
if (MorphicPreferences.showHoles) { // debug hole rendering
ctx.translate(-pos.x, -pos.y);
ctx.globalAlpha = 0.25;
ctx.fillStyle = 'white';
this.holes.forEach(hole => {
var sect = hole.translateBy(pos).intersect(clipped);
ctx.fillRect(
sect.left(),
sect.top(),
sect.width(),
sect.height()
);
});
}
}
ctx.restore();
};

Morph.prototype.fullDrawOn = function (aContext, aRect) {
if (!this.isVisible) {return; }
this.drawOn(aContext, aRect);
this.children.forEach(child => child.fullDrawOn(aContext, aRect));
};

Morph.prototype.hide = function () {
this.isVisible = false;
this.changed();
};

Morph.prototype.show = function () {
this.isVisible = true;
this.changed();
};

Morph.prototype.toggleVisibility = function () {
this.isVisible = !this.isVisible;
this.changed();
};

// Morph full image:

Morph.prototype.fullImage = function () {
var fb = this.fullBounds(),
img = newCanvas(fb.extent()),
ctx = img.getContext('2d');
ctx.translate(-fb.origin.x, -fb.origin.y);
this.fullDrawOn(ctx, fb);
return img;
};

// Morph shadow:

Morph.prototype.shadowImage = function (off, color) {
// for flat design mode
var fb, img, outline, sha, ctx,
offset = off || new Point(7, 7),
clr = color || new Color(0, 0, 0);
if (this.fullShadowSource) {
fb = this.fullBounds().extent();
img = this.fullImage();
} else { // optimization when all submorphs are contained inside
fb = this.extent();
img = this.getImage();
}
outline = newCanvas(fb);
ctx = outline.getContext('2d');
ctx.drawImage(img, 0, 0);
ctx.globalCompositeOperation = 'destination-out';
ctx.drawImage(
img,
-offset.x,
-offset.y
);
sha = newCanvas(fb);
ctx = sha.getContext('2d');
ctx.drawImage(outline, 0, 0);
ctx.globalCompositeOperation = 'source-atop';
ctx.fillStyle = clr.toString();
ctx.fillRect(0, 0, fb.x, fb.y);
return sha;
};

Morph.prototype.shadowImageBlurred = function (off, color) {
var fb, img, sha, ctx,
offset = off || new Point(7, 7),
blur = this.shadowBlur,
clr = color || new Color(0, 0, 0);
if (this.fullShadowSource) {
fb = this.fullBounds().extent().add(blur * 2);
img = this.fullImage();
} else { // optimization when all submorphs are contained inside
fb = this.extent().add(blur * 2);
img = this.getImage();
}
sha = newCanvas(fb);
ctx = sha.getContext('2d');
ctx.shadowOffsetX = offset.x;
ctx.shadowOffsetY = offset.y;
ctx.shadowBlur = blur;
ctx.shadowColor = clr.toString();
ctx.drawImage(
img,
blur - offset.x,
blur - offset.y
);
ctx.shadowOffsetX = 0;
ctx.shadowOffsetY = 0;
ctx.shadowBlur = 0;
ctx.globalCompositeOperation = 'destination-out';
ctx.drawImage(
img,
blur - offset.x,
blur - offset.y
);
return sha;
};

Morph.prototype.shadow = function (off, a, color) {
var shadow = new ShadowMorph(),
offset = off || new Point(7, 7),
alpha = a || ((a === 0) ? 0 : 0.2),
fb = this.fullBounds();
shadow.setExtent(fb.extent().add(this.shadowBlur * 2));
if (useBlurredShadows /*&& !MorphicPreferences.isFlat*/) {
shadow.cachedImage = this.shadowImageBlurred(offset, color);
shadow.alpha = alpha;
shadow.setPosition(fb.origin.add(offset).subtract(this.shadowBlur));
} else {
shadow.cachedImage = this.shadowImage(offset, color);
shadow.alpha = alpha;
shadow.setPosition(fb.origin.add(offset));
}
shadow.shouldRerender = false;
return shadow;
};

Morph.prototype.addShadow = function (off, a, color) {
var shadow,
offset = off || new Point(7, 7),
alpha = a || ((a === 0) ? 0 : 0.2);
shadow = this.shadow(offset, alpha, color);
this.addBack(shadow);
this.fullChanged();
return shadow;
};

Morph.prototype.getShadow = function () {
var shadows;
shadows = this.children.slice(0).reverse().filter(
child => child instanceof ShadowMorph
);
if (shadows.length !== 0) {
return shadows[0];
}
return null;
};

Morph.prototype.removeShadow = function () {
var shadow = this.getShadow();
if (shadow !== null) {
this.fullChanged();
this.removeChild(shadow);
}
};

// Morph pen trails:

Morph.prototype.penTrails = function () {
// answer my pen trails canvas. default is to answer my image
// NOTE: clients calling this also want to make sure the
// obtained canvas will be around at the next display cycle,
// so they might also wish to set the receiver's "isCachingImage"
// property to "true".
return this.getImage();
};

// Morph updating:

Morph.prototype.rerender = function () {
this.shouldRerender = true;
this.changed();
};

Morph.prototype.changed = function () {
var w = this.root();
if (w instanceof WorldMorph) {
w.broken.push(this.visibleBounds().spread());
}
if (this.parent) {
this.parent.childChanged(this);
}
};

Morph.prototype.fullChanged = function () {
var w = this.root();
if (w instanceof WorldMorph) {
w.broken.push(
this.fullBounds().spread()
);
}
};

Morph.prototype.childChanged = function () {
// react to a change in one of my children,
// default is to just pass this message on upwards
// override this method for Morphs that need to adjust accordingly
if (this.parent) {
this.parent.childChanged(this);
}
};

// Morph accessing - structure:

Morph.prototype.world = function () {
var root = this.root();
if (root instanceof WorldMorph) {
return root;
}
if (root instanceof HandMorph) {
return root.world;
}
return null;
};

Morph.prototype.add = function (aMorph) {
var owner = aMorph.parent;
if (owner !== null) {
owner.removeChild(aMorph);
}
this.addChild(aMorph);
};

Morph.prototype.addBack = function (aMorph) {
var owner = aMorph.parent;
if (owner !== null) {
owner.removeChild(aMorph);
}
this.addChildFirst(aMorph);
};

Morph.prototype.topMorphAt = function (point) {
var i, result;
if (!this.isVisible) {return null; }
for (i = this.children.length - 1; i >= 0; i -= 1) {
result = this.children[i].topMorphAt(point);
if (result) {return result; }
}
if (this.bounds.containsPoint(point)) {
if (this.holes.some(
any => any.translateBy(this.position()).containsPoint(point))
) {
return null;
}
if (this.isFreeForm) {
if (!this.isTransparentAt(point)) {
return this;
}
} else {
return this;
}
}
return null;
};

Morph.prototype.topMorphSuchThat = function (predicate) {
var next;
if (predicate.call(null, this)) {
next = detect(
this.children.slice(0).reverse(),
predicate
);
if (next) {
return next.topMorphSuchThat(predicate);
}
return this;
}
return null;
};

Morph.prototype.overlappedMorphs = function () {
//exclude the World
var world = this.world(),
fb = this.fullBounds(),
allParents = this.allParents(),
allChildren = this.allChildren(),
morphs;

morphs = world.allChildren();
return morphs.filter(m => {
return m.isVisible &&
m !== this &&
m !== world &&
!contains(allParents, m) &&
!contains(allChildren, m) &&
m.fullBounds().intersects(fb);
});
};

// Morph pixel access:

Morph.prototype.getPixelColor = function (aPoint) {
var point, context, data;
point = aPoint.subtract(this.bounds.origin);
context = this.getImage().getContext('2d');
data = context.getImageData(point.x, point.y, 1, 1);
return new Color(
data.data[0],
data.data[1],
data.data[2],
data.data[3] / 255
);
};

Morph.prototype.isTransparentAt = function (aPoint) {
var point, context, data;
if (this.bounds.containsPoint(aPoint)) {
if (this.texture) {
return false;
}
point = aPoint.subtract(this.bounds.origin);
context = this.getImage().getContext('2d');
data = context.getImageData(
Math.floor(point.x),
Math.floor(point.y),
1,
1
);
return data.data[3] === 0;
}
return false;
};

// Morph duplicating:

Morph.prototype.copy = function () {
var c = copy(this);
c.parent = null;
c.children = [];
c.bounds = this.bounds.copy();
return c;
};

Morph.prototype.fullCopy = function () {
/*
Produce a copy of me with my entire tree of submorphs. Morphs
mentioned more than once are all directed to a single new copy.
Other properties are also *shallow* copied, so you must override
to deep copy Arrays and (complex) Objects
*/
var map = new Map(), c;
c = this.copyRecordingReferences(map);
c.forAllChildren(m => m.updateReferences(map));
return c;
};

Morph.prototype.copyRecordingReferences = function (map) {
/*
Recursively copy this entire composite morph, recording the
correspondence between old and new morphs in the given dictionary.
This dictionary will be used to update intra-composite references
in the copy. See updateReferences().

Note: This default implementation copies ONLY morphs. If a morph
stores morphs in other properties that it wants to copy, then it
should override this method to do so. The same goes for morphs that
contain other complex data that should be copied when the morph is
duplicated.
*/
var c = this.copy();
map.set(this, c);
this.children.forEach(m => c.add(m.copyRecordingReferences(map)));
return c;
};

Morph.prototype.updateReferences = function (map) {
/*
Update intra-morph references within a composite morph that has
been copied. For example, if a button refers to morph X in the
orginal composite then the copy of that button in the new composite
should refer to the copy of X in new composite, not the original X.
*/
var properties = Object.keys(this),
l = properties.length,
property,
value,
reference,
i;
for (i = 0; i < l; i += 1) {
property = properties[i];
value = this[property];
if (value && value.isMorph) {
reference = map.get(value);
if (reference) { this[property] = reference; }
}
}
};

// Morph dragging and dropping:

Morph.prototype.rootForGrab = function () {
if (this instanceof ShadowMorph) {
return this.parent.rootForGrab();
}
if (this.parent instanceof ScrollFrameMorph) {
return this.parent;
}
if (this.parent === null ||
this.parent instanceof WorldMorph ||
this.parent instanceof FrameMorph ||
this.isDraggable === true) {
return this;
}
return this.parent.rootForGrab();
};

Morph.prototype.isCorrectingOutsideDrag = function () {
// make sure I don't "trail behind" the hand when dragged
// override for morphs that you want to be dragged outside
// their full bounds
return true;
};

Morph.prototype.wantsDropOf = function (aMorph) {
// default is to answer the general flag - change for my heirs
if ((aMorph instanceof HandleMorph) ||
(aMorph instanceof MenuMorph) ||
(aMorph instanceof InspectorMorph)) {
return false;
}
return this.acceptsDrops;
};

Morph.prototype.pickUp = function (wrrld) {
var world = wrrld || this.world();
this.setPosition(
world.hand.position().subtract(
this.extent().floorDivideBy(2)
)
);
world.hand.grab(this);
};

Morph.prototype.isPickedUp = function () {
return this.parentThatIsA(HandMorph) !== null;
};

Morph.prototype.situation = function () {
// answer a dictionary specifying where I am right now, so
// I can slide back to it if I'm dropped somewhere else
if (this.parent) {
return {
origin: this.parent,
position: this.position().subtract(this.parent.position())
};
}
return null;
};

Morph.prototype.slideBackTo = function (
situation,
msecs,
onBeforeDrop,
onComplete
) {
var pos = situation.origin.position().add(situation.position);
this.glideTo(
pos,
msecs,
null, // easing
() => {
situation.origin.add(this);
if (onBeforeDrop) {onBeforeDrop(); }
if (this.justDropped) {this.justDropped(); }
if (situation.origin.reactToDropOf) {
situation.origin.reactToDropOf(this);
}
if (onComplete) {onComplete(); }
}
);
};

// Morph animating:

Morph.prototype.glideTo = function (endPoint, msecs, easing, onComplete) {
var world = this.world(),
horizontal = new Animation(
x => this.setLeft(x),
() => this.left(),
-(this.left() - endPoint.x),
msecs === 0 ? 0 : msecs || 100,
easing
);
world.animations.push(horizontal);
world.animations.push(new Animation(
y => this.setTop(y),
() => this.top(),
-(this.top() - endPoint.y),
msecs === 0 ? 0 : msecs || 100,
easing,
() => {
horizontal.setter(horizontal.destination);
horizontal.isActive = false;
onComplete();
}

));
};

Morph.prototype.fadeTo = function (endAlpha, msecs, easing, onComplete) {
// include all my children, restore all original transparencies
// on completion, so I can be recovered
var world = this.world(),
oldAlpha = this.alpha;
this.children.forEach(child => child.fadeTo(endAlpha, msecs, easing));
world.animations.push(new Animation(
n => {
this.alpha = n;
this.changed();
},
() => this.alpha,
endAlpha - this.alpha,
msecs === 0 ? 0 : msecs || 200,
easing,
() => {
this.alpha = oldAlpha;
if (onComplete) {onComplete(); }
}
));
};

Morph.prototype.perish = function (msecs, onComplete) {
this.fadeTo(
0,
msecs === 0 ? 0 : msecs || 100,
null,
() => {
this.destroy();
if (onComplete) {onComplete(); }
}
);
};

// Morph utilities:

Morph.prototype.nop = nop;

Morph.prototype.resize = function () {
this.world().activeHandle = new HandleMorph(this);
};

Morph.prototype.move = function () {
this.world().activeHandle = new HandleMorph(
this,
null,
null,
null,
null,
'move'
);
};

Morph.prototype.moveCenter = function () {
this.world().activeHandle = new HandleMorph(
this,
null,
null,
null,
null,
'moveCenter'
);
};

Morph.prototype.hint = function (msg) {
var m, text;
text = msg;
if (msg) {
if (msg.toString) {
text = msg.toString();
}
} else {
text = 'NULL';
}
m = new MenuMorph(this, text);
m.isDraggable = true;
m.popUpCenteredAtHand(this.world());
};

Morph.prototype.inform = function (msg) {
var m, text;
text = msg;
if (msg) {
if (msg.toString) {
text = msg.toString();
}
} else {
text = 'NULL';
}
m = new MenuMorph(this, text);
m.addItem("Ok");
m.isDraggable = true;
m.popUpCenteredAtHand(this.world());
};

Morph.prototype.prompt = function (
msg,
callback,
environment,
defaultContents,
width,
floorNum,
ceilingNum,
isRounded,
action = nop
) {
var menu, entryField, slider, isNumeric;
if (ceilingNum) {
isNumeric = true;
}
menu = new MenuMorph(
callback || null,
msg || '',
environment || null
);
entryField = new StringFieldMorph(
defaultContents || '',
width || 100,
MorphicPreferences.prompterFontSize,
MorphicPreferences.prompterFontName,
false,
false,
isNumeric
);
menu.items.push(entryField);
if (ceilingNum || MorphicPreferences.useSliderForInput) {
slider = new SliderMorph(
floorNum || 0,
ceilingNum,
parseFloat(defaultContents),
Math.floor((ceilingNum - floorNum) / 4),
'horizontal'
);
slider.alpha = 1;
slider.color = new Color(225, 225, 225);
slider.button.color = menu.borderColor;
slider.button.highlightColor = slider.button.color.copy();
slider.button.highlightColor.b += 100;
slider.button.pressColor = slider.button.color.copy();
slider.button.pressColor.b += 150;
slider.setHeight(MorphicPreferences.prompterSliderSize);
if (isRounded) {
slider.action = (num) => {
entryField.changed();
entryField.text.text = Math.round(num).toString();
entryField.text.fixLayout();
entryField.text.changed();
entryField.text.edit();
action(Math.round(num));
};
} else {
slider.action = (num) => {
entryField.changed();
entryField.text.text = num.toString();
entryField.text.fixLayout();
entryField.text.changed();
action(num);
};
}
menu.items.push(slider);
}

menu.addLine(2);
menu.addItem('Ok', () => entryField.string());
menu.addItem(
'Cancel',
() => {
action(defaultContents);
return null;
}
);
menu.isDraggable = true;
menu.popUpAtHand(this.world());
entryField.text.edit();
};

Morph.prototype.pickColor = function (
msg,
callback,
environment,
defaultContents
) {
var menu, colorPicker;
menu = new MenuMorph(
callback || null,
msg || '',
environment || null
);
colorPicker = new ColorPickerMorph(defaultContents);
menu.items.push(colorPicker);
menu.addLine(2);
menu.addItem('Ok', () => colorPicker.getChoice());
menu.addItem('Cancel', () => null);
menu.isDraggable = true;
menu.popUpAtHand(this.world());
};

Morph.prototype.inspect = function (anotherObject) {
var world = this.world instanceof Function ?
this.world() : this.root() || this.world,
inspector,
inspectee = this;

if (anotherObject) {
inspectee = anotherObject;
}
inspector = new InspectorMorph(inspectee);
inspector.setPosition(world.hand.position());
inspector.keepWithin(world);
world.add(inspector);
inspector.changed();
};

Morph.prototype.inspectKeyEvent = function (event) {
this.inform(
'Key pressed: ' +
String.fromCharCode(event.charCode) +
'\n------------------------' +
'\ncharCode: ' +
event.charCode.toString() +
'\nkeyCode: ' +
event.keyCode.toString() +
'\nkey: ' +
event.key.toString() +
'\nshiftKey: ' +
event.shiftKey.toString() +
'\naltKey: ' +
event.altKey.toString() +
'\nctrlKey: ' +
event.ctrlKey.toString() +
'\ncmdKey: ' +
event.metaKey.toString()
);
};

// Morph menus:

Morph.prototype.contextMenu = function () {
var world;

if (this.customContextMenu) {
return this.customContextMenu;
}
world = this.world instanceof Function ? this.world() : this.world;
if (world && world.isDevMode) {
if (this.parent === world) {
return this.developersMenu();
}
return this.hierarchyMenu();
}
return this.userMenu() ||
(this.parent && this.parent.userMenu());
};

Morph.prototype.hierarchyMenu = function () {
var parents = this.allParents(),
world = this.world instanceof Function ? this.world() : this.world,
menu = new MenuMorph(this, null);

parents.forEach(each => {
if (each.developersMenu && (each !== world)) {
menu.addMenu(
each.toString().slice(0, 50),
each.developersMenu()
);
}
});
return menu;
};

Morph.prototype.developersMenu = function () {
// 'name' is not an official property of a function, hence:
var world = this.world instanceof Function ? this.world() : this.world,
userMenu = this.userMenu() ||
(this.parent && this.parent.userMenu()),
menu = new MenuMorph(this, this.constructor.name ||
this.constructor.toString().split(' ')[1].split('(')[0]);
if (userMenu) {
menu.addMenu('user features', userMenu);
menu.addLine();
}
menu.addItem(
"color...",
() => {
this.pickColor(
menu.title + localize('\ncolor:'),
this.setColor,
this,
this.color
);
},
'choose another color \nfor this morph'
);
menu.addItem(
"transparency...",
() => {
this.prompt(
menu.title + localize('\nalpha\nvalue:'),
this.setAlphaScaled,
this,
(this.alpha * 100).toString(),
null,
1,
100,
true
);
},
'set this morph\'s\nalpha value'
);
menu.addItem(
"resize...",
'resize',
'show a handle\nwhich can be dragged\nto change this morph\'s' +
' extent'
);
menu.addLine();
menu.addItem(
"duplicate",
() => this.fullCopy().pickUp(this.world()),
'make a copy\nand pick it up'
);
menu.addItem(
"pick up",
'pickUp',
'detach and put \ninto the hand'
);
menu.addItem(
"attach...",
'attach',
'stick this morph\nto another one'
);
menu.addItem(
"move...",
'move',
'show a handle\nwhich can be dragged\nto move this morph'
);
menu.addItem(
"inspect...",
'inspect',
'open a window\non all properties'
);
menu.addItem(
"pic...",
() => window.open(this.fullImage().toDataURL()),
'open a new window\nwith a picture of this morph'
);
menu.addLine();
if (this.isDraggable) {
menu.addItem(
"lock",
'toggleIsDraggable',
'make this morph\nunmovable'
);
} else {
menu.addItem(
"unlock",
'toggleIsDraggable',
'make this morph\nmovable'
);
}
menu.addItem("hide", 'hide');
menu.addItem("delete", 'destroy');
if (!(this instanceof WorldMorph)) {
menu.addLine();
menu.addItem(
"World...",
() => world.contextMenu().popUpAtHand(world),
'show the\nWorld\'s menu'
);
}
return menu;
};

Morph.prototype.userMenu = function () {
return null;
};

Morph.prototype.addToDemoMenu = function (aMorphOrMenuArray) {
// register a Morph or a Menu with Morphs with the World's demos menu
// a menu can be added in the form of a two-item array: [name, [morphs]]
WorldMorph.prototype.customMorphs.push(aMorphOrMenuArray);
};

// Morph menu actions

Morph.prototype.setAlphaScaled = function (alpha) {
// for context menu demo purposes
var newAlpha, unscaled;
if (typeof alpha === 'number') {
unscaled = alpha / 100;
this.alpha = Math.min(Math.max(unscaled, 0), 1);
} else {
newAlpha = parseFloat(alpha);
if (!isNaN(newAlpha)) {
unscaled = newAlpha / 100;
this.alpha = Math.min(Math.max(unscaled, 0), 1);
}
}
this.changed();
};

Morph.prototype.attach = function () {
var choices = this.overlappedMorphs(),
menu = new MenuMorph(this, 'choose new parent:');

choices.forEach(each => {
menu.addItem(each.toString().slice(0, 50), () => {
each.add(this);
this.isDraggable = false;
});
});
if (choices.length > 0) {
menu.popUpAtHand(this.world());
}
};

Morph.prototype.toggleIsDraggable = function () {
// for context menu demo purposes
this.isDraggable = !this.isDraggable;
};

Morph.prototype.colorSetters = function () {
// for context menu demo purposes
return ['color'];
};

Morph.prototype.numericalSetters = function () {
// for context menu demo purposes
return [
'setLeft',
'setTop',
'setWidth',
'setHeight',
'setAlphaScaled'
];
};

// Morph entry field tabbing:

Morph.prototype.allEntryFields = function () {
return this.allChildren().filter(each => {
return each.isEditable &&
(each instanceof StringMorph ||
each instanceof TextMorph);
});
};

Morph.prototype.nextEntryField = function (current) {
var fields = this.allEntryFields(),
idx = fields.indexOf(current);
if (idx !== -1) {
if (fields.length > idx + 1) {
return fields[idx + 1];
}
}
return fields[0];
};

Morph.prototype.previousEntryField = function (current) {
var fields = this.allEntryFields(),
idx = fields.indexOf(current);
if (idx !== -1) {
if (idx > 0) {
return fields[idx - 1];
}
return fields[fields.length - 1];
}
return fields[0];
};

Morph.prototype.tab = function (editField) {
/*
the <tab> key was pressed in one of my edit fields.
invoke my "nextTab()" function if it exists, else
propagate it up my owner chain.
*/
if (this.nextTab) {
this.nextTab(editField);
} else if (this.parent) {
this.parent.tab(editField);
}
};

Morph.prototype.backTab = function (editField) {
/*
the <back tab> key was pressed in one of my edit fields.
invoke my "previousTab()" function if it exists, else
propagate it up my owner chain.
*/
if (this.previousTab) {
this.previousTab(editField);
} else if (this.parent) {
this.parent.backTab(editField);
}
};

/*
the following are examples of what the navigation methods should
look like. Insert these at the World level for fallback, and at lower
levels in the Morphic tree (e.g. dialog boxes) for a more fine-grained
control over the tabbing cycle.

Morph.prototype.nextTab = function (editField) {
var next = this.nextEntryField(editField);
editField.clearSelection();
next.selectAll();
next.edit();
};

Morph.prototype.previousTab = function (editField) {
var prev = this.previousEntryField(editField);
editField.clearSelection();
prev.selectAll();
prev.edit();
};

*/

// Morph events:

Morph.prototype.escalateEvent = function (functionName, arg) {
var handler = this.parent;
while (!handler[functionName] && handler.parent !== null) {
handler = handler.parent;
}
if (handler[functionName]) {
handler[functionName](arg);
}
};

// Morph eval:

Morph.prototype.evaluateString = function (code) {
var result;

try {
result = eval(code);
this.changed();
} catch (err) {
this.inform(err);
}
return result;
};

// Morph collision detection:

Morph.prototype.isTouching = function (otherMorph) {
var data = this.overlappingPixels(otherMorph),
len, i;

if (!data) {return false; }
len = data[0].length;
for (i = 3; i < len; i += 4) {
if (data[0][i] && data[1][i]) {return true; }
}
return false;
};

Morph.prototype.overlappingPixels = function (otherMorph) {
var fb = this.fullBounds(),
otherFb = otherMorph.fullBounds(),
oRect = fb.intersect(otherFb),
thisImg, thatImg;

if (oRect.width() < 1 || oRect.height() < 1) {
return false;
}
thisImg = this.fullImage();
thatImg = otherMorph.fullImage();
if (thisImg.isRetinaEnabled !== thatImg.isRetinaEnabled) {
thisImg = normalizeCanvas(thisImg, true);
thatImg = normalizeCanvas(thatImg, true);
}
return [
thisImg.getContext("2d").getImageData(
oRect.left() - this.left(),
oRect.top() - this.top(),
oRect.width(),
oRect.height()
).data,
thatImg.getContext("2d").getImageData(
oRect.left() - otherMorph.left(),
oRect.top() - otherMorph.top(),
oRect.width(),
oRect.height()
).data
];
};

// ShadowMorph /////////////////////////////////////////////////////////

// ShadowMorph inherits from Morph:

ShadowMorph.prototype = new Morph();
ShadowMorph.prototype.constructor = ShadowMorph;
ShadowMorph.uber = Morph.prototype;

// ShadowMorph instance creation:

function ShadowMorph() {
this.init();
}

ShadowMorph.prototype.init = function () {
ShadowMorph.uber.init.call(this);
this.isCachingImage = true;
};

ShadowMorph.prototype.topMorphAt = function () {
return null;
};

// HandleMorph ////////////////////////////////////////////////////////

// I am a resize / move handle that can be attached to any Morph

// HandleMorph inherits from Morph:

HandleMorph.prototype = new Morph();
HandleMorph.prototype.constructor = HandleMorph;
HandleMorph.uber = Morph.prototype;

// HandleMorph instance creation:

function HandleMorph(target, minX, minY, insetX, insetY, type) {
// if insetY is missing, it will be the same as insetX
this.init(target, minX, minY, insetX, insetY, type);
}

HandleMorph.prototype.init = function (
target,
minX,
minY,
insetX,
insetY,
type
) {
var size = MorphicPreferences.handleSize;
this.target = target || null;
this.minExtent = new Point(minX || 0, minY || 0);
this.inset = new Point(insetX || 0, insetY || insetX || 0);
this.type = type || 'resize'; // also: 'move', 'moveCenter', 'movePivot'
this.isHighlighted = false;
HandleMorph.uber.init.call(this);
this.color = WHITE;
this.isDraggable = false;
if (this.type === 'movePivot') {
size *= 2;
}
this.setExtent(new Point(size, size));
this.fixLayout();
};

// HandleMorph drawing:

HandleMorph.prototype.fixLayout = function () {
if (this.target) {
if (this.type === 'moveCenter') {
this.setCenter(this.target.center());
} else if (this.type === 'movePivot') {
this.setCenter(this.target.rotationCenter());
} else { // 'resize', 'move'
this.setPosition(
this.target.bottomRight().subtract(
this.extent().add(this.inset)
)
);
}
this.target.add(this);
this.target.changed();
}
};

HandleMorph.prototype.render = function (ctx) {
if (this.type === 'movePivot') {
if (this.isHighlighted) {
this.renderCrosshairsOn(ctx, 0.5);
} else {
this.renderCrosshairsOn(ctx, 0.6);
}
} else {
if (this.isHighlighted) {
this.renderHandleOn(
ctx,
new Color(100, 100, 255),
WHITE
);
} else {
this.renderHandleOn(
ctx,
this.color,
new Color(100, 100, 100)
);
}
}
};

HandleMorph.prototype.renderCrosshairsOn = function (ctx, fract) {
var r = this.width() / 2;

// semi-transparent white background blob
ctx.fillStyle = 'rgba(255, 255, 255, 0.5)';
ctx.beginPath();
ctx.arc(
r,
r,
r * 0.9,
radians(0),
radians(360),
false
);
ctx.fill();

// solid black ring
ctx.strokeStyle = 'black';
ctx.lineWidth = 1;
ctx.beginPath();
ctx.arc(
r,
r,
r * fract,
radians(0),
radians(360),
false
);
ctx.stroke();

// vertically centered horizontal line
ctx.moveTo(0, r);
ctx.lineTo(this.width(), r);
ctx.stroke();

// horizontally centered vertical line
ctx.moveTo(r, 0);
ctx.lineTo(r, this.height());
ctx.stroke();
};

HandleMorph.prototype.renderHandleOn = function (
ctx,
color,
shadowColor
) {
var isSquare = (this.type.indexOf('move') === 0),
p1 = new Point(0, this.height()), // bottom left
p2 = new Point(this.width(), 0), // top right
p11, p22, i;

ctx.lineWidth = 1;
ctx.lineCap = 'round';
ctx.strokeStyle = color.toString();

if (isSquare) {
p11 = p1.copy();
p22 = p2.copy();
for (i = 0; i <= this.height(); i = i + 6) {
p11.y = p1.y - i;
p22.y = p2.y - i;

ctx.beginPath();
ctx.moveTo(p11.x, p11.y);
ctx.lineTo(p22.x, p22.y);
ctx.closePath();
ctx.stroke();
}
}

p11 = p1.copy();
p22 = p2.copy();
for (i = 0; i <= this.width(); i = i + 6) {
p11.x = p1.x + i;
p22.x = p2.x + i;

ctx.beginPath();
ctx.moveTo(p11.x, p11.y);
ctx.lineTo(p22.x, p22.y);
ctx.closePath();
ctx.stroke();
}
ctx.strokeStyle = shadowColor.toString();

if (isSquare) {
p11 = p1.copy();
p22 = p2.copy();
for (i = -2; i <= this.height(); i = i + 6) {
p11.y = p1.y - i;
p22.y = p2.y - i;

ctx.beginPath();
ctx.moveTo(p11.x, p11.y);
ctx.lineTo(p22.x, p22.y);
ctx.closePath();
ctx.stroke();
}
}

p11 = p1.copy();
p22 = p2.copy();
for (i = 2; i <= this.width(); i = i + 6) {
p11.x = p1.x + i;
p22.x = p2.x + i;

ctx.beginPath();
ctx.moveTo(p11.x, p11.y);
ctx.lineTo(p22.x, p22.y);
ctx.closePath();
ctx.stroke();
}
};

// HandleMorph stepping:

HandleMorph.prototype.step = null;

HandleMorph.prototype.mouseDownLeft = function (pos) {
var world = this.root(),
offset;

if (!this.target) {
return null;
}
if (this.type.indexOf('move') === 0) {
offset = pos.subtract(this.center());
} else {
offset = pos.subtract(this.bounds.origin);
}

this.step = () => {
var newPos, newExt;
if (world.hand.mouseButton) {
newPos = world.hand.bounds.origin.copy().subtract(offset);
if (this.type === 'resize') {
newExt = newPos.add(
this.extent().add(this.inset)
).subtract(this.target.bounds.origin);
newExt = newExt.max(this.minExtent);
this.target.setExtent(newExt);

this.setPosition(
this.target.bottomRight().subtract(
this.extent().add(this.inset)
)
);
} else if (this.type === 'moveCenter') {
this.target.setCenter(newPos);
} else if (this.type === 'movePivot') {
this.target.setPivot(newPos);
this.setCenter(this.target.rotationCenter());
} else { // type === 'move'
this.target.setPosition(
newPos.subtract(this.target.extent())
.add(this.extent())
);
}
} else {
this.step = null;
}
};

if (!this.target.step) {
this.target.step = nop;
}
};

// HandleMorph dragging and dropping:

HandleMorph.prototype.rootForGrab = function () {
return this;
};

// HandleMorph events:

HandleMorph.prototype.mouseEnter = function () {
this.isHighlighted = true;
this.changed();
};

HandleMorph.prototype.mouseLeave = function () {
this.isHighlighted = false;
this.changed();
};

// HandleMorph menu:

HandleMorph.prototype.attach = function () {
var choices = this.overlappedMorphs(),
menu = new MenuMorph(this, 'choose target:');

choices.forEach(each => {
menu.addItem(each.toString().slice(0, 50), () => {
this.isDraggable = false;
this.target = each;
this.fixLayout();
});
});
if (choices.length > 0) {
menu.popUpAtHand(this.world());
}
};

// PenMorph ////////////////////////////////////////////////////////////

// I am a simple LOGO-wise turtle.

// PenMorph: referenced constructors

var PenMorph;

// PenMorph inherits from Morph:

PenMorph.prototype = new Morph();
PenMorph.prototype.constructor = PenMorph;
PenMorph.uber = Morph.prototype;

// PenMorph instance creation:

function PenMorph() {
this.init();
}

PenMorph.prototype.init = function () {
var size = MorphicPreferences.handleSize * 4;

// additional properties:
this.isWarped = false; // internal optimization
this.heading = 0;
this.isDown = true;
this.size = 1;
this.penPoint = 'tip'; // or 'center"
this.penBounds = null; // rect around the visible arrow shape

HandleMorph.uber.init.call(this);
this.setExtent(new Point(size, size));
};

// PenMorph updating - optimized for warping, i.e atomic recursion

PenMorph.prototype.changed = function () {
if (this.isWarped) {return; }
PenMorph.uber.changed.call(this);

};

// PenMorph display:

PenMorph.prototype.render = function (ctx, facing) {
// my orientation can be overridden with the "facing" parameter to
// implement Scratch-style rotation styles

var start, dest, left, right, len,
direction = facing || this.heading;

len = this.width() / 2;
start = this.center().subtract(this.bounds.origin);

if (this.penPoint === 'tip') {
dest = start.distanceAngle(len * 0.75, direction - 180);
left = start.distanceAngle(len, direction + 195);
right = start.distanceAngle(len, direction - 195);
} else { // 'middle'
dest = start.distanceAngle(len * 0.75, direction);
left = start.distanceAngle(len * 0.33, direction + 230);
right = start.distanceAngle(len * 0.33, direction - 230);
}

// cache penBounds
this.penBounds = new Rectangle(
Math.min(start.x, dest.x, left.x, right.x),
Math.min(start.y, dest.y, left.y, right.y),
Math.max(start.x, dest.x, left.x, right.x),
Math.max(start.y, dest.y, left.y, right.y)
);

// draw arrow shape
ctx.fillStyle = this.color.toString();
ctx.beginPath();

ctx.moveTo(start.x, start.y);
ctx.lineTo(left.x, left.y);
ctx.lineTo(dest.x, dest.y);
ctx.lineTo(right.x, right.y);

ctx.closePath();
ctx.strokeStyle = 'white';
ctx.lineWidth = 3;
ctx.stroke();
ctx.strokeStyle = 'black';
ctx.lineWidth = 1;
ctx.stroke();
ctx.fill();
};

// PenMorph access:

PenMorph.prototype.setHeading = function (degrees) {
this.heading = ((+degrees % 360) + 360) % 360;
this.fixLayout();
this.rerender();
};

PenMorph.prototype.numericalSetters = function () {
// for context menu demo purposes
return [
'setLeft',
'setTop',
'setWidth',
'setHeight',
'setAlphaScaled',
'setHeading'
];
};

// PenMorph menu:

PenMorph.prototype.developersMenu = function () {
var menu = PenMorph.uber.developersMenu.call(this);
menu.addLine();
menu.addItem(
'set rotation',
"setRotation",
'interactively turn this morph\nusing a dial widget'
);
return menu;
};

PenMorph.prototype.setRotation = function () {
var menu, dial,
name = this.name || this.constructor.name;
if (name.length > 10) {
name = name.slice(0, 9) + '...';
}
menu = new MenuMorph(this, name);
dial = new DialMorph(null, null, this.heading);
dial.rootForGrab = () => dial;
dial.target = this;
dial.action = 'setHeading';
menu.items.push(dial);
menu.addLine();
menu.addItem('(90) right', () => this.setHeading(90));
menu.addItem('(-90) left', () => this.setHeading(-90));
menu.addItem('(0) up', () => this.setHeading(0));
menu.addItem('(180) down', () => this.setHeading(180));
menu.isDraggable = true;
menu.popUpAtHand(this.world());
};

// PenMorph drawing:

PenMorph.prototype.drawLine = function (start, dest) {
var context = this.parent.penTrails().getContext('2d'),
from = start.subtract(this.parent.bounds.origin),
to = dest.subtract(this.parent.bounds.origin);
if (this.isDown) {
context.lineWidth = this.size;
context.strokeStyle = this.color.toString();
context.lineCap = 'round';
context.lineJoin = 'round';
context.beginPath();
context.moveTo(from.x, from.y);
context.lineTo(to.x, to.y);
context.stroke();
if (this.isWarped === false) {
this.world().broken.push(
start.rectangle(dest).expandBy(
Math.max(this.size / 2, 1)
).intersect(this.parent.visibleBounds()).spread()
);
}
}
};

// PenMorph turtle ops:

PenMorph.prototype.turn = function (degrees) {
this.setHeading(this.heading + parseFloat(degrees));
};

PenMorph.prototype.forward = function (steps) {
var start = this.center(),
dest,
dist = parseFloat(steps);
if (dist >= 0) {
dest = this.position().distanceAngle(dist, this.heading);
} else {
dest = this.position().distanceAngle(
Math.abs(dist),
(this.heading - 180)
);
}
this.setPosition(dest);
this.drawLine(start, this.center());
};

PenMorph.prototype.down = function () {
this.isDown = true;
};

PenMorph.prototype.up = function () {
this.isDown = false;
};

PenMorph.prototype.clear = function () {
this.parent.rerender();
};

// PenMorph optimization for atomic recursion:

PenMorph.prototype.startWarp = function () {
this.isWarped = true;
};

PenMorph.prototype.endWarp = function () {
this.isWarped = false;
this.parent.changed();
};

PenMorph.prototype.warp = function (fun) {
this.startWarp();
fun.call(this);
this.endWarp();
};

PenMorph.prototype.warpOp = function (selector, argsArray) {
this.startWarp();
this[selector].apply(this, argsArray);
this.endWarp();
};

// PenMorph demo ops:
// try these with WARP eg.: this.warp(function () {tree(12, 120, 20)})

PenMorph.prototype.warpSierpinski = function (length, min) {
this.warpOp('sierpinski', [length, min]);
};

PenMorph.prototype.sierpinski = function (length, min) {
var i;
if (length > min) {
for (i = 0; i < 3; i += 1) {
this.sierpinski(length * 0.5, min);
this.turn(120);
this.forward(length);
}
}
};

PenMorph.prototype.warpTree = function (level, length, angle) {
this.warpOp('tree', [level, length, angle]);
};

PenMorph.prototype.tree = function (level, length, angle) {
if (level > 0) {
this.size = level;
this.forward(length);
this.turn(angle);
this.tree(level - 1, length * 0.75, angle);
this.turn(angle * -2);
this.tree(level - 1, length * 0.75, angle);
this.turn(angle);
this.forward(-length);
}
};

// ColorPaletteMorph ///////////////////////////////////////////////////

var ColorPaletteMorph;

// ColorPaletteMorph inherits from Morph:

ColorPaletteMorph.prototype = new Morph();
ColorPaletteMorph.prototype.constructor = ColorPaletteMorph;
ColorPaletteMorph.uber = Morph.prototype;

// ColorPaletteMorph instance creation:

function ColorPaletteMorph(target, sizePoint) {
this.init(
target || null,
sizePoint || new Point(80, 50)
);
}

ColorPaletteMorph.prototype.init = function (target, size) {
ColorPaletteMorph.uber.init.call(this);
this.isCachingImage = true;
this.target = target;
this.targetSetter = 'color';
this.setExtent(size);
this.choice = null;
};

ColorPaletteMorph.prototype.render = function (ctx) {
var ext = this.extent(),
x, y, h, l;

this.choice = BLACK;
for (x = 0; x <= ext.x; x += 1) {
h = 360 * x / ext.x;
for (y = 0; y <= ext.y; y += 1) {
l = 100 - (y / ext.y * 100);
ctx.fillStyle = 'hsl(' + h + ',100%,' + l + '%)';
ctx.fillRect(x, y, 1, 1);
}
}
};

ColorPaletteMorph.prototype.mouseMove = function (pos) {
this.choice = this.getPixelColor(pos);
this.updateTarget();
};

ColorPaletteMorph.prototype.mouseDownLeft = function (pos) {
this.choice = this.getPixelColor(pos);
this.updateTarget();
};

ColorPaletteMorph.prototype.updateTarget = function () {
if (this.target instanceof Morph && this.choice !== null) {
if (this.target[this.targetSetter] instanceof Function) {
this.target[this.targetSetter](this.choice);
} else {
this.target[this.targetSetter] = this.choice;
this.target.rerender();
}
}
};

// ColorPaletteMorph menu:

ColorPaletteMorph.prototype.developersMenu = function () {
var menu = ColorPaletteMorph.uber.developersMenu.call(this);
menu.addLine();
menu.addItem(
'set target',
"setTarget",
'choose another morph\nwhose color property\n will be' +
' controlled by this one'
);
return menu;
};

ColorPaletteMorph.prototype.setTarget = function () {
var choices = this.overlappedMorphs(),
menu = new MenuMorph(this, 'choose target:');

choices.push(this.world());
choices.forEach(each => {
menu.addItem(each.toString().slice(0, 50), () => {
this.target = each;
this.setTargetSetter();
});
});
if (choices.length === 1) {
this.target = choices[0];
this.setTargetSetter();
} else if (choices.length > 0) {
menu.popUpAtHand(this.world());
}
};

ColorPaletteMorph.prototype.setTargetSetter = function () {
var choices = this.target.colorSetters(),
menu = new MenuMorph(this, 'choose target property:');

choices.forEach(each => {
menu.addItem(each, () => this.targetSetter = each);
});
if (choices.length === 1) {
this.targetSetter = choices[0];
} else if (choices.length > 0) {
menu.popUpAtHand(this.world());
}
};

// GrayPaletteMorph ///////////////////////////////////////////////////

var GrayPaletteMorph;

// GrayPaletteMorph inherits from ColorPaletteMorph:

GrayPaletteMorph.prototype = new ColorPaletteMorph();
GrayPaletteMorph.prototype.constructor = GrayPaletteMorph;
GrayPaletteMorph.uber = ColorPaletteMorph.prototype;

// GrayPaletteMorph instance creation:

function GrayPaletteMorph(target, sizePoint) {
this.init(
target || null,
sizePoint || new Point(80, 10)
);
}

GrayPaletteMorph.prototype.render = function (ctx) {
var ext = this.extent(),
gradient;

this.choice = BLACK;
gradient = ctx.createLinearGradient(0, 0, ext.x, ext.y);
gradient.addColorStop(0, 'black');
gradient.addColorStop(1, 'white');
ctx.fillStyle = gradient;
ctx.fillRect(0, 0, ext.x, ext.y);
};

// ColorPickerMorph ///////////////////////////////////////////////////

// ColorPickerMorph inherits from Morph:

ColorPickerMorph.prototype = new Morph();
ColorPickerMorph.prototype.constructor = ColorPickerMorph;
ColorPickerMorph.uber = Morph.prototype;

// ColorPickerMorph instance creation:

function ColorPickerMorph(defaultColor) {
this.init(defaultColor || WHITE);
}

ColorPickerMorph.prototype.init = function (defaultColor) {
this.choice = defaultColor;
ColorPickerMorph.uber.init.call(this);
this.color = WHITE;
this.setExtent(new Point(80, 80));
};

ColorPickerMorph.prototype.fixLayout = function () {
var cpal, gpal, x, y;

this.children.forEach(child => child.destroy());
this.children = [];
this.feedback = new Morph();
this.feedback.color = this.choice;
this.feedback.setExtent(new Point(20, 20));
cpal = new ColorPaletteMorph(
this.feedback,
new Point(this.width(), 50)
);
gpal = new GrayPaletteMorph(
this.feedback,
new Point(this.width(), 5)
);
cpal.setPosition(this.bounds.origin);
this.add(cpal);
gpal.setPosition(cpal.bottomLeft());
this.add(gpal);
x = (gpal.left() +
Math.floor((gpal.width() - this.feedback.width()) / 2));
y = gpal.bottom() + Math.floor((this.bottom() -
gpal.bottom() - this.feedback.height()) / 2);
this.feedback.setPosition(new Point(x, y));
this.add(this.feedback);
};

ColorPickerMorph.prototype.getChoice = function () {
return this.feedback.color;
};

ColorPickerMorph.prototype.rootForGrab = function () {
return this;
};

// BlinkerMorph ////////////////////////////////////////////////////////

// can be used for text cursors

var BlinkerMorph;

// BlinkerMorph inherits from Morph:

BlinkerMorph.prototype = new Morph();
BlinkerMorph.prototype.constructor = BlinkerMorph;
BlinkerMorph.uber = Morph.prototype;

// BlinkerMorph instance creation:

function BlinkerMorph(rate) {
this.init(rate);
}

BlinkerMorph.prototype.init = function (rate) {
BlinkerMorph.uber.init.call(this);
this.color = new Color(0, 0, 0);
this.fps = rate || 2;
};

// BlinkerMorph stepping:

BlinkerMorph.prototype.step = function () {
this.toggleVisibility();
};

// CursorMorph /////////////////////////////////////////////////////////

// I am a String/Text editing widget

// CursorMorph: referenced constructors

var CursorMorph;

// CursorMorph inherits from BlinkerMorph:

CursorMorph.prototype = new BlinkerMorph();
CursorMorph.prototype.constructor = CursorMorph;
CursorMorph.uber = BlinkerMorph.prototype;

// CursorMorph preferences settings:

CursorMorph.prototype.viewPadding = 1;

// CursorMorph instance creation:

function CursorMorph(aStringOrTextMorph, aTextarea) {
this.init(aStringOrTextMorph, aTextarea);
}

CursorMorph.prototype.init = function (aStringOrTextMorph, aTextarea) {
var ls;

// additional properties:
this.keyDownEventUsed = false;
this.target = aStringOrTextMorph;
this.originalContents = this.target.text;
this.originalAlignment = this.target.alignment;
this.slot = this.target.text.length;
this.textarea = aTextarea;

CursorMorph.uber.init.call(this);

// override inherited defaults
ls = fontHeight(this.target.fontSize);
this.setExtent(new Point(Math.max(Math.floor(ls / 20), 1), ls));

if (this.target instanceof TextMorph &&
(this.target.alignment !== 'left')) {
this.target.setAlignmentToLeft();
}
this.textarea.value = this.target.text;
this.textarea.style.fontSize = this.target.fontSize + 'px';
this.gotoSlot(this.slot);
this.updateTextAreaPosition();
this.syncTextareaSelectionWith(this.target);
};

// CursorMorph event handling

/*
There are three cases when the textarea gets inputs:

1. Inputs that represent special shortcuts of Snap!, so we
don't want the textarea to handle it. These events are captured in
"keydown" event handler.

2. inputs that change the content of the textarea, we need to update
the content of its target morph accordingly. This is handled in
the "input" event handler.

3. input that change the textarea without triggering an "input" event,
e.g. selection change, cursor movements. These are handled in the
"keyup" event handler.

Note that some changes in case 2 are not caused by keyboards (for
example, select a word by clicking in IME window), so there are overlaps
between case 2 and case 3. but no one can replace the other.
*/

CursorMorph.prototype.processKeyDown = function (event) {
/* Special shortcuts
- ctrl-d, ctrl-i and ctrl-p: doit, inspect it and print it
- tab: goto next text field
- esc: discard the editing
- enter / shift+enter: accept the editing
*/
var keyName = event.key,
shift = event.shiftKey,
singleLineText = this.target instanceof StringMorph,
dest;

if (!isNil(this.target.receiver) && (event.ctrlKey || event.metaKey)) {
if (keyName === 'd') {
event.preventDefault();
this.target.doIt();
return;
} else if (keyName === 'i') {
event.preventDefault();
this.target.inspectIt();
return;
} else if (keyName === 'p') {
event.preventDefault();
this.target.showIt();
return;
}
}

if (keyName === 'Tab' || keyName === 'U+0009') {
if (shift) {
this.target.backTab(this.target);
} else {
this.target.tab(this.target);
}
event.preventDefault();
this.target.escalateEvent('reactToEdit', this.target);
} else if (keyName === 'Escape') {
this.cancel();
} else if (keyName === "Enter" && (singleLineText || shift)) {
this.accept();
} else {
// catch "up arrow" and "down arrow" keys
if (keyName === 'ArrowDown') {
dest = this.target.downFrom(this.slot);
this.textarea.setSelectionRange(dest, dest);
// to do: allow holding shift to select
event.preventDefault();
}
if (keyName === 'ArrowUp') {
dest = this.target.upFrom(this.slot);
this.textarea.setSelectionRange(dest, dest);
// to do: allow holding shift to select
event.preventDefault();
}
this.target.escalateEvent('reactToKeystroke', event);
}
};

CursorMorph.prototype.processKeyUp = function (event) {
// handle selection change and cursor position change.
var textarea = this.textarea,
target = this.target;

if (textarea.selectionStart === textarea.selectionEnd) {
target.startMark = null;
target.endMark = null;
} else {
if (textarea.selectionDirection === 'backward') {
target.startMark = textarea.selectionEnd;
target.endMark = textarea.selectionStart;
} else {
target.startMark = textarea.selectionStart;
target.endMark = textarea.selectionEnd;
}
}
target.fixLayout();
target.rerender();
this.gotoSlot(textarea.selectionEnd);
};

CursorMorph.prototype.processInput = function (event) {
// handle content change.
var target = this.target,
textarea = this.textarea,
filteredContent,
caret;

// filter invalid chars for numeric fields
function filterText (content) {
var points = 0,
hasE = false,
result = '',
i, ch, valid;
for (i = 0; i < content.length; i += 1) {
ch = content.charAt(i);
valid = (
('0' <= ch && ch <= '9') || // digits
(ch.toLowerCase() === 'e') || // scientific notation
((i === 0 || hasE) && ch === '-') || // leading '-' or sc. not.
(ch === '.' && points === 0) // at most '.'
);
if (valid) {
result += ch;
if (ch === '.') {
points += 1;
}
if (ch.toLowerCase() === 'e') {
hasE = true;
}
}
}
return result;
}

if (target.isNumeric) {
filteredContent = filterText(textarea.value);
} else {
filteredContent = textarea.value;
}

if (filteredContent.length < textarea.value.length) {
textarea.value = filteredContent;
caret = Math.min(textarea.selectionStart, filteredContent.length);
textarea.selectionEnd = caret;
textarea.selectionStart = caret;
}
// target morph: copy the content and selection status to the target.
target.text = filteredContent;

if (textarea.selectionStart === textarea.selectionEnd) {
target.startMark = null;
target.endMark = null;
} else {
if (textarea.selectionDirection === 'backward') {
target.startMark = textarea.selectionEnd;
target.endMark = textarea.selectionStart;
} else {
target.startMark = textarea.selectionStart;
target.endMark = textarea.selectionEnd;
}
}
target.changed();
target.fixLayout();
target.rerender();

// cursor morph: copy the caret position to cursor morph.
this.gotoSlot(textarea.selectionStart);

this.updateTextAreaPosition();

// the "reactToInput" event gets triggered AFTER "reactToKeystroke"
this.target.escalateEvent('reactToInput', event);
};

// CursorMorph synching:

CursorMorph.prototype.updateTextAreaPosition = function () {
var pos = getDocumentPositionOf(this.target.world().worldCanvas),
origin = this.target.bounds.origin.add(new Point(pos.x, pos.y));

function number2px (n) {
return Math.ceil(n) + 'px';
}

this.textarea.style.top = number2px(origin.y);
this.textarea.style.left = number2px(origin.x);
};

CursorMorph.prototype.syncTextareaSelectionWith = function (targetMorph) {
var start = targetMorph.startMark,
end = targetMorph.endMark;

if (start === end) {
this.textarea.setSelectionRange(this.slot, this.slot, 'none');
} else if (start < end) {
this.textarea.setSelectionRange(start, end, 'forward');
} else {
this.textarea.setSelectionRange(end, start, 'backward');
}
this.textarea.focus();
};

// CursorMorph navigation:

CursorMorph.prototype.gotoSlot = function (slot) {
var length = this.target.text.length,
pos = this.target.slotPosition(slot),
right,
left;
this.slot = slot < 0 ? 0 : slot > length ? length : slot;
if (this.parent && this.target.isScrollable) {
right = this.parent.right() - this.viewPadding;
left = this.parent.left() + this.viewPadding;
if (pos.x > right) {
this.target.setLeft(this.target.left() + right - pos.x);
pos.x = right;
}
if (pos.x < left) {
left = Math.min(this.parent.left(), left);
this.target.setLeft(this.target.left() + left - pos.x);
pos.x = left;
}
if (this.target.right() < right &&
right - this.target.width() < left) {
pos.x += right - this.target.right();
this.target.setRight(right);
}
}
this.show();
this.setPosition(pos);
if (this.parent
&& this.parent.parent instanceof ScrollFrameMorph
&& this.target.isScrollable) {
this.parent.parent.scrollCursorIntoView(this);
}
};

CursorMorph.prototype.gotoPos = function (aPoint) {
this.gotoSlot(this.target.slotAt(aPoint));
this.show();
};

// CursorMorph selecting:

CursorMorph.prototype.updateSelection = function (shift) {
if (shift) {
if (isNil(this.target.endMark) && isNil(this.target.startMark)) {
this.target.startMark = this.slot;
this.target.endMark = this.slot;
} else if (this.target.endMark !== this.slot) {
this.target.endMark = this.slot;
this.target.changed();
}
} else {
this.target.clearSelection();
}
};

// CursorMorph editing:

CursorMorph.prototype.accept = function () {
var world = this.root();
if (world) {
world.stopEditing();
}
this.escalateEvent('accept', this);
};

CursorMorph.prototype.cancel = function () {
var world = this.root();
this.undo();
if (world) {
world.stopEditing();
}
this.escalateEvent('cancel', this);
};

CursorMorph.prototype.undo = function () {
this.target.text = this.originalContents;
this.target.changed();
this.target.fixLayout();
this.target.changed();
this.gotoSlot(0);
};

// CursorMorph destroying:

CursorMorph.prototype.destroy = function () {
if (this.target.alignment !== this.originalAlignment) {
this.target.alignment = this.originalAlignment;
this.target.changed();
}
CursorMorph.uber.destroy.call(this);
this.target.world().resetKeyboardHandler();
};

// BoxMorph ////////////////////////////////////////////////////////////

// I can have an optionally rounded border

var BoxMorph;

// BoxMorph inherits from Morph:

BoxMorph.prototype = new Morph();
BoxMorph.prototype.constructor = BoxMorph;
BoxMorph.uber = Morph.prototype;

// BoxMorph instance creation:

function BoxMorph(edge, border, borderColor) {
this.init(edge, border, borderColor);
}

BoxMorph.prototype.init = function (edge, border, borderColor) {
this.edge = edge || 4;
this.border = border || ((border === 0) ? 0 : 2);
this.borderColor = borderColor || BLACK;
BoxMorph.uber.init.call(this);
};

// BoxMorph drawing:

BoxMorph.prototype.render = function (ctx) {
if ((this.edge === 0) && (this.border === 0)) {
BoxMorph.uber.render.call(this, ctx);
return;
}
ctx.fillStyle = this.color.toString();
ctx.beginPath();
this.outlinePath(
ctx,
Math.max(this.edge - this.border, 0),
this.border
);
ctx.closePath();
ctx.fill();
if (this.border > 0) {
ctx.lineWidth = this.border;
ctx.strokeStyle = this.borderColor.toString();
ctx.beginPath();
this.outlinePath(ctx, this.edge, this.border / 2);
ctx.closePath();
ctx.stroke();
}
};

BoxMorph.prototype.outlinePath = function (ctx, corner, inset) {
var w = this.width(),
h = this.height(),
radius = Math.min(corner, (Math.min(w, h) - inset) / 2),
offset = radius + inset;

// top left:
ctx.arc(
offset,
offset,
radius,
radians(-180),
radians(-90),
false
);
// top right:
ctx.arc(
w - offset,
offset,
radius,
radians(-90),
radians(-0),
false
);
// bottom right:
ctx.arc(
w - offset,
h - offset,
radius,
radians(0),
radians(90),
false
);
// bottom left:
ctx.arc(
offset,
h - offset,
radius,
radians(90),
radians(180),
false
);
};

// BoxMorph menus:

BoxMorph.prototype.developersMenu = function () {
var menu = BoxMorph.uber.developersMenu.call(this);
menu.addLine();
menu.addItem(
"border width...",
() => {
this.prompt(
menu.title + '\nborder\nwidth:',
this.setBorderWidth,
this,
this.border.toString(),
null,
0,
100,
true
);
},
'set the border\'s\nline size'
);
menu.addItem(
"border color...",
() => {
this.pickColor(
menu.title + '\nborder color:',
this.setBorderColor,
this,
this.borderColor
);
},
'set the border\'s\nline color'
);
menu.addItem(
"corner size...",
() => {
this.prompt(
menu.title + '\ncorner\nsize:',
this.setCornerSize,
this,
this.edge.toString(),
null,
0,
100,
true
);
},
'set the corner\'s\nradius'
);
return menu;
};

BoxMorph.prototype.setBorderWidth = function (size) {
// for context menu demo purposes
var newSize;
if (typeof size === 'number') {
this.border = Math.max(size, 0);
} else {
newSize = parseFloat(size);
if (!isNaN(newSize)) {
this.border = Math.max(newSize, 0);
}
}
this.changed();
};

BoxMorph.prototype.setBorderColor = function (color) {
// for context menu demo purposes
if (color) {
this.borderColor = color;
this.changed();
}
};

BoxMorph.prototype.setCornerSize = function (size) {
// for context menu demo purposes
var newSize;
if (typeof size === 'number') {
this.edge = Math.max(size, 0);
} else {
newSize = parseFloat(size);
if (!isNaN(newSize)) {
this.edge = Math.max(newSize, 0);
}
}
this.changed();
};

BoxMorph.prototype.colorSetters = function () {
// for context menu demo purposes
return ['color', 'borderColor'];
};

BoxMorph.prototype.numericalSetters = function () {
// for context menu demo purposes
var list = BoxMorph.uber.numericalSetters.call(this);
list.push('setBorderWidth', 'setCornerSize');
return list;
};

// SpeechBubbleMorph ///////////////////////////////////////////////////

/*
I am a comic-style speech bubble that can display either a string,
a Morph, a Canvas or a toString() representation of anything else.
If I am invoked using popUp() I behave like a tool tip.
*/

// SpeechBubbleMorph: referenced constructors

var SpeechBubbleMorph;

// SpeechBubbleMorph inherits from BoxMorph:

SpeechBubbleMorph.prototype = new BoxMorph();
SpeechBubbleMorph.prototype.constructor = SpeechBubbleMorph;
SpeechBubbleMorph.uber = BoxMorph.prototype;

// SpeechBubbleMorph instance creation:

function SpeechBubbleMorph(
contents,
color,
edge,
border,
borderColor,
padding,
isThought,
noShadow
) {
this.init(
contents,
color,
edge,
border,
borderColor,
padding,
isThought,
noShadow
);
}

SpeechBubbleMorph.prototype.init = function (
contents,
color,
edge,
border,
borderColor,
padding,
isThought, // bool or anything but "true" to draw no hook at all
noShadow // explicit TRUE to suppress
) {
this.isPointingRight = true; // orientation of text
this.contents = contents || '';
this.padding = padding || 0; // additional vertical pixels
this.isThought = isThought || false; // draw "think" bubble
this.isClickable = false;
SpeechBubbleMorph.uber.init.call(
this,
edge || 6,
border || ((border === 0) ? 0 : 1),
borderColor || new Color(140, 140, 140)
);
this.hasShadow = noShadow !== true;
this.noDropShadow = true;
this.fullShadowSource = false;
this.color = color || new Color(230, 230, 230);
this.fixLayout();
};

// SpeechBubbleMorph invoking:

SpeechBubbleMorph.prototype.popUp = function (world, pos, isClickable) {
this.fixLayout();
this.setPosition(pos.subtract(new Point(0, this.height())));
this.keepWithin(world);
world.add(this);
this.fullChanged();
world.hand.destroyTemporaries();
world.hand.temporaries.push(this);

if (!isClickable) {
this.mouseEnter = this.destroy;
} else {
this.isClickable = true;
}
};

// SpeechBubbleMorph drawing:

SpeechBubbleMorph.prototype.fixLayout = function () {
// determine my extent and arrange my contents

if (this.contentsMorph) {
this.contentsMorph.destroy();
}
if (this.contents instanceof Morph) {
this.contentsMorph = this.contents;
} else if (isString(this.contents)) {
this.contentsMorph = new TextMorph(
this.contents,
MorphicPreferences.bubbleHelpFontSize,
null,
false,
true,
'center'
);
} else if (this.contents instanceof HTMLCanvasElement) {
this.contentsMorph = new Morph();
this.contentsMorph.setExtent(new Point(
this.contents.width,
this.contents.height
));
this.contentsMorph.cachedImage = this.contents;
} else {
this.contentsMorph = new TextMorph(
this.contents.toString(),
MorphicPreferences.bubbleHelpFontSize,
null,
false,
true,
'center'
);
}
this.add(this.contentsMorph);

// adjust my layout
this.bounds.setExtent(
new Point(
this.contentsMorph.width() +
(this.padding ? this.padding * 2 : this.edge * 2),
this.contentsMorph.height() +
this.edge +
this.border * 2 +
this.padding * 2 +
2
)
);

// position my contents
this.contentsMorph.setPosition(this.position().add(
new Point(
this.padding || this.edge,
this.border + this.padding + 1
)
));

// refresh a shallow shadow
if (this.hasShadow) {
this.removeShadow();
this.addShadow(new Point(2, 2), 80);
}
};

SpeechBubbleMorph.prototype.outlinePath = function (ctx, radius, inset) {
var offset = radius + inset,
w = this.width(),
h = this.height(),
rad;

function circle(x, y, r) {
ctx.moveTo(x + r, y);
ctx.arc(x, y, r, radians(0), radians(360));
}

// top left:
ctx.arc(
offset,
offset,
radius,
radians(-180),
radians(-90),
false
);
// top right:
ctx.arc(
w - offset,
offset,
radius,
radians(-90),
radians(-0),
false
);
// bottom right:
ctx.arc(
w - offset,
h - offset - radius,
radius,
radians(0),
radians(90),
false
);
if (!this.isThought) { // draw speech bubble hook
if (this.isPointingRight) {
ctx.lineTo(
offset + radius,
h - offset
);
ctx.lineTo(
radius / 2 + inset,
h - inset
);
} else { // pointing left
ctx.lineTo(
w - (radius / 2 + inset),
h - inset
);
ctx.lineTo(
w - (offset + radius),
h - offset
);
}
}
// bottom left:
ctx.arc(
offset,
h - offset - radius,
radius,
radians(90),
radians(180),
false
);
if (this.isThought === true) { // use anything but "true" to draw nothing
// close large bubble:
ctx.lineTo(
inset,
offset
);
// draw thought bubbles:
if (this.isPointingRight) {
// tip bubble:
rad = radius / 4;
circle(
rad + inset,
h - rad - inset,
rad
);
// middle bubble:
rad = radius / 3.2;
circle(
(rad * 2) + inset,
h - rad - (inset * 2),
rad
);
// top bubble:
rad = radius / 2.8;
circle(
(rad * 3) + inset * 2,
h - rad - (inset * 4),
rad
);
} else { // pointing left
// tip bubble:
rad = radius / 4;
circle(
w - (rad + inset),
h - rad - inset,
rad
);
// middle bubble:
rad = radius / 3.2;
circle(
w - (rad * 2 + inset),
h - rad - inset * 2,
rad
);
// top bubble:
rad = radius / 2.8;
circle(
w - (rad * 3 + inset * 2),
h - rad - inset * 4,
rad
);
}
}
};

// SpeechBubbleMorph shadow

/*
only take the 'plain' image, so the box rounding and the
shadow doesn't become conflicted by embedded scrolling panes
*/

SpeechBubbleMorph.prototype.shadowImage = function (off, color) {
// for "flat" design mode
var fb, img, outline, sha, ctx,
offset = off || new Point(7, 7),
clr = color || new Color(0, 0, 0);
fb = this.extent();
img = this.getImage();
outline = newCanvas(fb);
ctx = outline.getContext('2d');
ctx.drawImage(img, 0, 0);
ctx.globalCompositeOperation = 'destination-out';
ctx.drawImage(
img,
-offset.x,
-offset.y
);
sha = newCanvas(fb);
ctx = sha.getContext('2d');
ctx.drawImage(outline, 0, 0);
ctx.globalCompositeOperation = 'source-atop';
ctx.fillStyle = clr.toString();
ctx.fillRect(0, 0, fb.x, fb.y);
return sha;
};

SpeechBubbleMorph.prototype.shadowImageBlurred = function (off, color) {
var fb, img, sha, ctx,
offset = off || new Point(7, 7),
blur = this.shadowBlur,
clr = color || new Color(0, 0, 0);
fb = this.extent().add(blur * 2);
img = this.getImage();
sha = newCanvas(fb);
ctx = sha.getContext('2d');
ctx.shadowOffsetX = offset.x;
ctx.shadowOffsetY = offset.y;
ctx.shadowBlur = blur;
ctx.shadowColor = clr.toString();
ctx.drawImage(
img,
blur - offset.x,
blur - offset.y
);
ctx.shadowOffsetX = 0;
ctx.shadowOffsetY = 0;
ctx.shadowBlur = 0;
ctx.globalCompositeOperation = 'destination-out';
ctx.drawImage(
img,
blur - offset.x,
blur - offset.y
);
return sha;
};

// DialMorph //////////////////////////////////////////////////////

// I am a knob than can be turned to select a number

var DialMorph;

// DialMorph inherits from Morph:

DialMorph.prototype = new Morph();
DialMorph.prototype.constructor = DialMorph;
DialMorph.uber = Morph.prototype;

function DialMorph(min, max, value, tick, radius) {
this.init(min, max, value, tick, radius);
}

DialMorph.prototype.init = function (min, max, value, tick, radius) {
this.target = null;
this.action = null;
this.min = min || 0;
this.max = max || 360;
this.value = Math.max(this.min, (value || 0) % this.max);
this.tick = tick || 15;
this.fillColor = null;

DialMorph.uber.init.call(this);

this.color = new Color(230, 230, 230);
this.setRadius(radius || MorphicPreferences.menuFontSize * 4);
};

DialMorph.prototype.setRadius = function (radius) {
this.radius = radius;
this.setExtent(new Point(this.radius * 2, this.radius * 2));
};

DialMorph.prototype.setValue = function (value, snapToTick, noUpdate) {
var range = this.max - this.min;
value = value || 0;
this.value = this.min + (((+value % range) + range) % range);
if (snapToTick) {
if (this.value < this.tick) {
this.value = this.min;
} else {
this.value -= this.value % this.tick % this.value;
}
}
this.changed();
if (noUpdate) {return; }
this.updateTarget();
};

DialMorph.prototype.getValueOf = function (point) {
var range = this.max - this.min,
center = this.center(),
deltaX = point.x - center.x,
deltaY = center.y - point.y,
angle = Math.abs(deltaX) < 0.001 ? (deltaY < 0 ? 90 : 270)
: Math.round(
(deltaX >= 0 ? 0 : 180)
- (Math.atan(deltaY / deltaX) * 57.2957795131)
),
value = angle + 90 % 360,
ratio = value / 360;
return range * ratio + this.min;
};

DialMorph.prototype.setExtent = function (aPoint) {
var size = Math.min(aPoint.x, aPoint.y);
this.radius = size / 2;
DialMorph.uber.setExtent.call(this, new Point(size, size));
};

DialMorph.prototype.render = function (ctx) {
var i, angle, x1, y1, x2, y2,
light = this.color.lighter().toString(),
range = this.max - this.min,
ticks = range / this.tick,
face = this.radius * 0.75,
inner = face * 0.85,
outer = face * 0.95;

// draw a light border:
ctx.fillStyle = light;
ctx.beginPath();
ctx.arc(
this.radius,
this.radius,
face + Math.min(1, this.radius - face),
0,
2 * Math.PI,
false
);
ctx.closePath();
ctx.fill();

// fill circle:
ctx.fillStyle = this.color.toString();
ctx.beginPath();
ctx.arc(
this.radius,
this.radius,
face,
0,
2 * Math.PI,
false
);
ctx.closePath();
ctx.fill();

// fill value
angle = (this.value - this.min) * (Math.PI * 2) / range - Math.PI / 2;
ctx.fillStyle = (this.fillColor || this.color.darker()).toString();
ctx.beginPath();
ctx.arc(
this.radius,
this.radius,
face,
Math.PI / -2,
angle,
false
);
ctx.lineTo(this.radius, this.radius);
ctx.closePath();
ctx.fill();

// draw ticks:
ctx.strokeStyle = new Color(35, 35, 35).toString();
ctx.lineWidth = 1;
for (i = 0; i < ticks; i += 1) {
angle = (i - 3) * (Math.PI * 2) / ticks - Math.PI / 2;
ctx.beginPath();
x1 = this.radius + Math.cos(angle) * inner;
y1 = this.radius + Math.sin(angle) * inner;
x2 = this.radius + Math.cos(angle) * outer;
y2 = this.radius + Math.sin(angle) * outer;
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.stroke();
}

// draw a filled center:
inner = face * 0.05;
ctx.fillStyle = 'black';
ctx.beginPath();
ctx.arc(
this.radius,
this.radius,
inner,
0,
2 * Math.PI,
false
);
ctx.closePath();
ctx.fill();

// draw the inner hand:
ctx.strokeStyle = 'black';
ctx.lineWidth = 1;
angle = (this.value - this.min) * (Math.PI * 2) / range - Math.PI / 2;
outer = face * 0.8;
x1 = this.radius + Math.cos(angle) * inner;
y1 = this.radius + Math.sin(angle) * inner;
x2 = this.radius + Math.cos(angle) * outer;
y2 = this.radius + Math.sin(angle) * outer;
ctx.beginPath();
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.stroke();

// draw a read-out circle:
inner = inner * 2;
x2 = this.radius + Math.cos(angle) * (outer + inner);
y2 = this.radius + Math.sin(angle) * (outer + inner);
ctx.fillStyle = 'black';
ctx.beginPath();
ctx.arc(
x2,
y2,
inner,
0,
2 * Math.PI,
false
);
ctx.closePath();
ctx.stroke();

// draw the outer hand:
angle = (this.value - this.min) * (Math.PI * 2) / range - Math.PI / 2;
x1 = this.radius + Math.cos(angle) * face;
y1 = this.radius + Math.sin(angle) * face;
x2 = this.radius + Math.cos(angle) * (this.radius - 1);
y2 = this.radius + Math.sin(angle) * (this.radius - 1);
ctx.beginPath();
ctx.moveTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.lineWidth = 3;
ctx.strokeStyle = light;
ctx.stroke();
ctx.lineWidth = 1;
ctx.strokeStyle = 'black';
ctx.stroke();

// draw arrow tip:
angle = radians(degrees(angle) - 4);
x1 = this.radius + Math.cos(angle) * this.radius * 0.9;
y1 = this.radius + Math.sin(angle) * this.radius * 0.9;
ctx.beginPath();
ctx.moveTo(x1, y1);
angle = radians(degrees(angle) + 8);
x1 = this.radius + Math.cos(angle) * this.radius * 0.9;
y1 = this.radius + Math.sin(angle) * this.radius * 0.9;
ctx.lineTo(x1, y1);
ctx.lineTo(x2, y2);
ctx.closePath();
ctx.lineWidth = 3;
ctx.strokeStyle = light;
ctx.stroke();
ctx.lineWidth = 1;
ctx.strokeStyle = 'black';
ctx.stroke();
ctx.fill();
};

// DialMorph stepping:

DialMorph.prototype.step = null;

DialMorph.prototype.mouseDownLeft = function (pos) {
var world = this.root();

this.step = () => {
if (world.hand.mouseButton) {
this.setValue(
this.getValueOf(world.hand.bounds.origin),
world.currentKey !== 16 // snap to tick
);
} else {
this.step = null;
}
};
};

// DialMorph menu:

DialMorph.prototype.developersMenu = function () {
var menu = DialMorph.uber.developersMenu.call(this);
menu.addLine();
menu.addItem(
'set target',
"setTarget",
'select another morph\nwhose numerical property\nwill be ' +
'controlled by this one'
);
return menu;
};

DialMorph.prototype.setTarget = function () {
var choices = this.overlappedMorphs(),
menu = new MenuMorph(this, 'choose target:');

choices.push(this.world());
choices.forEach(each => {
menu.addItem(each.toString().slice(0, 50), () => {
this.target = each;
this.setTargetSetter();
});
});
if (choices.length === 1) {
this.target = choices[0];
this.setTargetSetter();
} else if (choices.length > 0) {
menu.popUpAtHand(this.world());
}
};

DialMorph.prototype.setTargetSetter = function () {
var choices = this.target.numericalSetters(),
menu = new MenuMorph(this, 'choose target property:');

choices.forEach(each => {
menu.addItem(each, () => this.action = each);
});
if (choices.length === 1) {
this.action = choices[0];
} else if (choices.length > 0) {
menu.popUpAtHand(this.world());
}
};

DialMorph.prototype.updateTarget = function () {
if (this.action) {
if (typeof this.action === 'function') {
this.action.call(this.target, this.value);
} else { // assume it's a String
this.target[this.action](this.value);
}
}
};

// CircleBoxMorph //////////////////////////////////////////////////////

// I can be used for sliders

var CircleBoxMorph;

// CircleBoxMorph inherits from Morph:

CircleBoxMorph.prototype = new Morph();
CircleBoxMorph.prototype.constructor = CircleBoxMorph;
CircleBoxMorph.uber = Morph.prototype;

function CircleBoxMorph(orientation) {
this.init(orientation || 'vertical');
}

CircleBoxMorph.prototype.init = function (orientation) {
CircleBoxMorph.uber.init.call(this);
this.orientation = orientation;
this.autoOrient = true;
this.setExtent(new Point(20, 100));
};

CircleBoxMorph.prototype.autoOrientation = function () {
if (this.height() > this.width()) {
this.orientation = 'vertical';
} else {
this.orientation = 'horizontal';
}
};

CircleBoxMorph.prototype.render = function (ctx) {
var w = this.width(),
h = this.height(),
radius;

if (this.autoOrient) {
this.autoOrientation();
}

if (this.orientation === 'vertical') {
radius = w / 2;
ctx.beginPath();

// top semi-circle
ctx.arc(
radius,
radius,
radius,
radians(180),
radians(0),
false
);

// right line
ctx.lineTo(
w,
h - radius
);

// bottom semi-circle
ctx.arc(
radius,
h - radius,
radius,
radians(0),
radians(180),
false
);

} else {
radius = h / 2;
ctx.beginPath();

// left semi-circle
ctx.arc(
radius,
radius,
radius,
radians(90),
radians(-90),
false
);

// top line
ctx.lineTo(
w - radius,
0
);

// right semi-circle
ctx.arc(
w - radius,
radius,
radius,
radians(-90),
radians(90),
false
);
}
ctx.closePath();
ctx.fillStyle = this.color.toString();
ctx.fill();
};

// CircleBoxMorph menu:

CircleBoxMorph.prototype.developersMenu = function () {
var menu = CircleBoxMorph.uber.developersMenu.call(this);
menu.addLine();
if (this.orientation === 'vertical') {
menu.addItem(
"horizontal...",
'toggleOrientation',
'toggle the\norientation'
);
} else {
menu.addItem(
"vertical...",
'toggleOrientation',
'toggle the\norientation'
);
}
return menu;
};

CircleBoxMorph.prototype.toggleOrientation = function () {
var center = this.center();
this.changed();
if (this.orientation === 'vertical') {
this.orientation = 'horizontal';
} else {
this.orientation = 'vertical';
}
this.setExtent(new Point(this.height(), this.width()));
this.setCenter(center);
};

// SliderButtonMorph ///////////////////////////////////////////////////

var SliderButtonMorph;

// SliderButtonMorph inherits from CircleBoxMorph:

SliderButtonMorph.prototype = new CircleBoxMorph();
SliderButtonMorph.prototype.constructor = SliderButtonMorph;
SliderButtonMorph.uber = CircleBoxMorph.prototype;

function SliderButtonMorph(orientation) {
this.init(orientation);
}

SliderButtonMorph.prototype.init = function (orientation) {
this.color = new Color(80, 80, 80);
this.highlightColor = new Color(90, 90, 140);
this.pressColor = new Color(80, 80, 160);
this.userState = 'normal'; // 'highlight', 'pressed'
this.is3D = false;
this.hasMiddleDip = true;
SliderButtonMorph.uber.init.call(this, orientation);
};

SliderButtonMorph.prototype.autoOrientation = nop;

SliderButtonMorph.prototype.render = function (ctx) {
var colorBak = this.color;
if (this.userState === 'highlight') {
this.color = this.highlightColor;
} else if (this.userState === 'pressed') {
this.color = this.pressColor;
}
SliderButtonMorph.uber.render.call(this, ctx);
if (this.is3D || !MorphicPreferences.isFlat) {
this.renderEdges(ctx);
}
this.color = colorBak;
};

SliderButtonMorph.prototype.renderEdges = function (ctx) {
var gradient,
radius,
w = this.width(),
h = this.height();

ctx.lineJoin = 'round';
ctx.lineCap = 'round';

if (this.orientation === 'vertical') {
ctx.lineWidth = w / 3;
gradient = ctx.createLinearGradient(
0,
0,
ctx.lineWidth,
0
);
gradient.addColorStop(0, 'white');
gradient.addColorStop(1, this.color.toString());

ctx.strokeStyle = gradient;
ctx.beginPath();
ctx.moveTo(ctx.lineWidth * 0.5, w / 2);
ctx.lineTo(ctx.lineWidth * 0.5, h - w / 2);
ctx.stroke();

gradient = ctx.createLinearGradient(
w - ctx.lineWidth,
0,
w,
0
);
gradient.addColorStop(0, this.color.toString());
gradient.addColorStop(1, 'black');

ctx.strokeStyle = gradient;
ctx.beginPath();
ctx.moveTo(w - ctx.lineWidth * 0.5, w / 2);
ctx.lineTo(w - ctx.lineWidth * 0.5, h - w / 2);
ctx.stroke();

if (this.hasMiddleDip) {
gradient = ctx.createLinearGradient(
ctx.lineWidth,
0,
w - ctx.lineWidth,
0
);

radius = w / 4;
gradient.addColorStop(0, 'black');
gradient.addColorStop(0.35, this.color.toString());
gradient.addColorStop(0.65, this.color.toString());
gradient.addColorStop(1, 'white');

ctx.fillStyle = gradient;
ctx.beginPath();
ctx.arc(
w / 2,
h / 2,
radius,
radians(0),
radians(360),
false
);
ctx.closePath();
ctx.fill();
}
} else if (this.orientation === 'horizontal') {
ctx.lineWidth = h / 3;
gradient = ctx.createLinearGradient(
0,
0,
0,
ctx.lineWidth
);
gradient.addColorStop(0, 'white');
gradient.addColorStop(1, this.color.toString());

ctx.strokeStyle = gradient;
ctx.beginPath();
ctx.moveTo(h / 2, ctx.lineWidth * 0.5);
ctx.lineTo(w - h / 2, ctx.lineWidth * 0.5);
ctx.stroke();

gradient = ctx.createLinearGradient(
0,
h - ctx.lineWidth,
0,
h
);
gradient.addColorStop(0, this.color.toString());
gradient.addColorStop(1, 'black');

ctx.strokeStyle = gradient;
ctx.beginPath();
ctx.moveTo(h / 2, h - ctx.lineWidth * 0.5);
ctx.lineTo(w - h / 2, h - ctx.lineWidth * 0.5);
ctx.stroke();

if (this.hasMiddleDip) {
gradient = ctx.createLinearGradient(
0,
ctx.lineWidth,
0,
h - ctx.lineWidth
);

radius = h / 4;
gradient.addColorStop(0, 'black');
gradient.addColorStop(0.35, this.color.toString());
gradient.addColorStop(0.65, this.color.toString());
gradient.addColorStop(1, 'white');

ctx.fillStyle = gradient;
ctx.beginPath();
ctx.arc(
this.width() / 2,
this.height() / 2,
radius,
radians(0),
radians(360),
false
);
ctx.closePath();
ctx.fill();
}
}
};

//SliderButtonMorph events:

SliderButtonMorph.prototype.mouseEnter = function () {
this.userState = 'highlight';
this.rerender();
};

SliderButtonMorph.prototype.mouseLeave = function () {
this.userState = 'normal';
this.rerender();
};

SliderButtonMorph.prototype.mouseDownLeft = function (pos) {
this.userState = 'pressed';
this.rerender();
this.escalateEvent('mouseDownLeft', pos);
};

SliderButtonMorph.prototype.mouseClickLeft = function () {
this.userState = 'highlight';
this.rerender();
};

SliderButtonMorph.prototype.mouseMove = function () {
// prevent my parent from getting picked up
nop();
};

// SliderMorph ///////////////////////////////////////////////////

// SliderMorph inherits from CircleBoxMorph:

SliderMorph.prototype = new CircleBoxMorph();
SliderMorph.prototype.constructor = SliderMorph;
SliderMorph.uber = CircleBoxMorph.prototype;

function SliderMorph(start, stop, value, size, orientation, color) {
this.init(
start || 0,
stop || 100,
value || 0,
size || 10,
orientation || 'vertical',
color
);
}

SliderMorph.prototype.init = function (
start,
stop,
value,
size,
orientation,
color
) {
this.target = null;
this.action = null;
this.start = start;
this.stop = stop;
this.value = value;
this.size = size;
this.offset = null;
this.button = new SliderButtonMorph();
this.button.isDraggable = false;
this.button.alpha = MorphicPreferences.isFlat ? 0.7 : 1;
this.button.color = new Color(200, 200, 200);
this.button.highlightColor = new Color(210, 210, 255);
this.button.pressColor = new Color(180, 180, 255);
SliderMorph.uber.init.call(this, orientation);
this.add(this.button);
this.alpha = MorphicPreferences.isFlat ? 0 : 0.3;
this.color = color || new Color(0, 0, 0);
this.setExtent(new Point(20, 100));
this.fixLayout();
};

SliderMorph.prototype.autoOrientation = nop;

SliderMorph.prototype.rangeSize = function () {
return this.stop - this.start;
};

SliderMorph.prototype.ratio = function () {
return this.size / (this.rangeSize() + 1);
};

SliderMorph.prototype.unitSize = function () {
if (this.orientation === 'vertical') {
return (this.height() - this.button.height()) /
this.rangeSize();
}
return (this.width() - this.button.width()) /
this.rangeSize();
};

SliderMorph.prototype.fixLayout = function () {
var bw, bh, posX, posY;

this.button.orientation = this.orientation;
if (this.orientation === 'vertical') {
bw = this.width() - 2;
bh = Math.max(bw, Math.round(this.height() * this.ratio()));
this.button.setExtent(new Point(bw, bh));
posX = 1;
posY = Math.max(
Math.min(
Math.round((this.value - this.start) * this.unitSize()),
this.height() - this.button.height()
),
0
);
} else {
bh = this.height() - 2;
bw = Math.max(bh, Math.round(this.width() * this.ratio()));
this.button.setExtent(new Point(bw, bh));
posY = 1;
posX = Math.max(
Math.min(
Math.round((this.value - this.start) * this.unitSize()),
this.width() - this.button.width()
),
0
);
}
this.button.setPosition(
new Point(posX, posY).add(this.bounds.origin)
);
};

SliderMorph.prototype.updateValue = function () {
var relPos;
if (this.orientation === 'vertical') {
relPos = this.button.top() - this.top();
} else {
relPos = this.button.left() - this.left();
}
this.value = Math.round(relPos / this.unitSize() + this.start);
this.updateTarget();
};

SliderMorph.prototype.updateTarget = function () {
if (this.action) {
if (typeof this.action === 'function') {
this.action.call(this.target, this.value);
} else { // assume it's a String
this.target[this.action](this.value);
}
}
};

// SliderMorph menu:

SliderMorph.prototype.developersMenu = function () {
var menu = SliderMorph.uber.developersMenu.call(this);
menu.addItem(
"show value...",
'showValue',
'display a dialog box\nshowing the selected number'
);
menu.addItem(
"floor...",
() => {
this.prompt(
menu.title + '\nfloor:',
this.setStart,
this,
this.start.toString(),
null,
0,
this.stop - this.size,
true
);
},
'set the minimum value\nwhich can be selected'
);
menu.addItem(
"ceiling...",
() => {
this.prompt(
menu.title + '\nceiling:',
this.setStop,
this,
this.stop.toString(),
null,
this.start + this.size,
this.size * 100,
true
);
},
'set the maximum value\nwhich can be selected'
);
menu.addItem(
"button size...",
() => {
this.prompt(
menu.title + '\nbutton size:',
this.setSize,
this,
this.size.toString(),
null,
1,
this.stop - this.start,
true
);
},
'set the range\ncovered by\nthe slider button'
);
menu.addLine();
menu.addItem(
'set target',
"setTarget",
'select another morph\nwhose numerical property\nwill be ' +
'controlled by this one'
);
return menu;
};

SliderMorph.prototype.showValue = function () {
this.inform(this.value);
};

SliderMorph.prototype.userSetStart = function (num) {
// for context menu demo purposes
this.start = Math.max(num, this.stop);
};

SliderMorph.prototype.setStart = function (num, noUpdate) {
// for context menu demo purposes
var newStart;
if (typeof num === 'number') {
this.start = Math.min(
num,
this.stop - this.size
);
} else {
newStart = parseFloat(num);
if (!isNaN(newStart)) {
this.start = Math.min(
newStart,
this.stop - this.size
);
}
}
this.value = Math.max(this.value, this.start);
if (!noUpdate) {this.updateTarget(); }
this.fixLayout();
this.rerender();
};

SliderMorph.prototype.setStop = function (num, noUpdate) {
// for context menu demo purposes
var newStop;
if (typeof num === 'number') {
this.stop = Math.max(num, this.start + this.size);
} else {
newStop = parseFloat(num);
if (!isNaN(newStop)) {
this.stop = Math.max(newStop, this.start + this.size);
}
}
this.value = Math.min(this.value, this.stop);
if (!noUpdate) {this.updateTarget(); }
this.fixLayout();
this.rerender();
};

SliderMorph.prototype.setSize = function (num, noUpdate) {
// for context menu demo purposes
var newSize;
if (typeof num === 'number') {
this.size = Math.min(
Math.max(num, 1),
this.stop - this.start
);
} else {
newSize = parseFloat(num);
if (!isNaN(newSize)) {
this.size = Math.min(
Math.max(newSize, 1),
this.stop - this.start
);
}
}
this.value = Math.min(this.value, this.stop - this.size);
if (!noUpdate) {this.updateTarget(); }
this.fixLayout();
this.rerender();
};

SliderMorph.prototype.setTarget = function () {
var choices = this.overlappedMorphs(),
menu = new MenuMorph(this, 'choose target:');

choices.push(this.world());
choices.forEach(each => {
menu.addItem(each.toString().slice(0, 50), () => {
this.target = each;
this.setTargetSetter();
});
});
if (choices.length === 1) {
this.target = choices[0];
this.setTargetSetter();
} else if (choices.length > 0) {
menu.popUpAtHand(this.world());
}
};

SliderMorph.prototype.setTargetSetter = function () {
var choices = this.target.numericalSetters(),
menu = new MenuMorph(this, 'choose target property:');

choices.forEach(each => {
menu.addItem(each, () => this.action = each);
});
if (choices.length === 1) {
this.action = choices[0];
} else if (choices.length > 0) {
menu.popUpAtHand(this.world());
}
};

SliderMorph.prototype.numericalSetters = function () {
// for context menu demo purposes
var list = SliderMorph.uber.numericalSetters.call(this);
list.push('setStart', 'setStop', 'setSize');
return list;
};

// SliderMorph stepping:

SliderMorph.prototype.step = null;

SliderMorph.prototype.mouseDownLeft = function (pos) {
var world;

if (!this.button.bounds.containsPoint(pos)) {
this.offset = new Point(); // return null;
} else {
this.offset = pos.subtract(this.button.bounds.origin);
}
world = this.root();

this.step = () => {
var mousePos, newX, newY;
if (world.hand.mouseButton) {
mousePos = world.hand.bounds.origin;
if (this.orientation === 'vertical') {
newX = this.button.bounds.origin.x;
newY = Math.max(
Math.min(
mousePos.y - this.offset.y,
this.bottom() - this.button.height()
),
this.top()
);
} else {
newY = this.button.bounds.origin.y;
newX = Math.max(
Math.min(
mousePos.x - this.offset.x,
this.right() - this.button.width()
),
this.left()
);
}
this.button.setPosition(new Point(newX, newY));
this.updateValue();
} else {
this.step = null;
}
};
};

// MouseSensorMorph ////////////////////////////////////////////////////

// for demo and debuggin purposes only, to be removed later

var MouseSensorMorph;

// MouseSensorMorph inherits from BoxMorph:

MouseSensorMorph.prototype = new BoxMorph();
MouseSensorMorph.prototype.constructor = MouseSensorMorph;
MouseSensorMorph.uber = BoxMorph.prototype;

// MouseSensorMorph instance creation:

function MouseSensorMorph(edge, border, borderColor) {
this.init(edge, border, borderColor);
}

MouseSensorMorph.prototype.init = function (edge, border, borderColor) {
MouseSensorMorph.uber.init.call(this);
this.edge = edge || 4;
this.border = border || 2;
this.color = WHITE;
this.borderColor = borderColor || BLACK;
this.isTouched = false;
this.upStep = 0.05;
this.downStep = 0.02;
};

MouseSensorMorph.prototype.touch = function () {
if (!this.isTouched) {
this.isTouched = true;
this.alpha = 0.6;

this.step = () => {
if (this.isTouched) {
if (this.alpha < 1) {
this.alpha += this.upStep;
}
} else if (this.alpha > this.downStep) {
this.alpha -= this.downStep;
} else {
this.alpha = 0;
this.step = null;
}
this.changed();
};
}
};

MouseSensorMorph.prototype.unTouch = function () {
this.isTouched = false;
};

MouseSensorMorph.prototype.mouseEnter = function () {
this.touch();
};

MouseSensorMorph.prototype.mouseLeave = function () {
this.unTouch();
};

MouseSensorMorph.prototype.mouseDownLeft = function () {
this.touch();
};

MouseSensorMorph.prototype.mouseClickLeft = function () {
this.unTouch();
};

// InspectorMorph //////////////////////////////////////////////////////

// InspectorMorph: referenced constructors

var ListMorph;
var TriggerMorph;

// InspectorMorph inherits from BoxMorph:

InspectorMorph.prototype = new BoxMorph();
InspectorMorph.prototype.constructor = InspectorMorph;
InspectorMorph.uber = BoxMorph.prototype;

// InspectorMorph instance creation:

function InspectorMorph(target) {
this.init(target);
}

InspectorMorph.prototype.init = function (target) {
// additional properties:
this.target = target;
this.currentProperty = null;
this.showing = 'attributes';
this.markOwnProperties = false;
this.hasUserEditedDetails = false;

// initialize inherited properties:
InspectorMorph.uber.init.call(this);

// override inherited properties:
this.isDraggable = true;
this.border = 1;
this.edge = MorphicPreferences.isFlat ? 1 : 5;
this.color = new Color(60, 60, 60);
this.borderColor = new Color(95, 95, 95);
this.fps = 25;

// panes:
this.label = null;
this.list = null;
this.detail = null;
this.work = null;
this.buttonInspect = null;
this.buttonClose = null;
this.buttonSubset = null;
this.buttonEdit = null;
this.resizer = null;

if (this.target) {
this.buildPanes();
}

this.setExtent(
new Point(
MorphicPreferences.handleSize * 20,
MorphicPreferences.handleSize * 20 * 2 / 3
)
);
};

InspectorMorph.prototype.setTarget = function (target) {
this.target = target;
this.currentProperty = null;
this.buildPanes();
};

InspectorMorph.prototype.updateCurrentSelection = function () {
var val, txt, cnts,
sel = this.list.selected,
currentTxt = this.detail.contents.children[0],
root = this.root();

if (root &&
(root.keyboardFocus instanceof CursorMorph) &&
(root.keyboardFocus.target === currentTxt)) {
this.hasUserEditedDetails = true;
return;
}
if (isNil(sel) || this.hasUserEditedDetails) {return; }
val = this.target[sel];
this.currentProperty = val;
if (isNil(val)) {
txt = 'NULL';
} else if (isString(val)) {
txt = val;
} else {
txt = val.toString();
}
if (currentTxt.text === txt) {return; }
cnts = new TextMorph(txt);
cnts.isEditable = true;
cnts.enableSelecting();
cnts.setReceiver(this.target);
this.detail.setContents(cnts);
};

InspectorMorph.prototype.buildPanes = function () {
var attribs = [], property, ctrl, ev, doubleClickAction;

// remove existing panes
this.children.forEach(m => {
if (m !== this.work) { // keep work pane around
m.destroy();
}
});
this.children = [];

// label
this.label = new TextMorph(this.target.toString());
this.label.fontSize = MorphicPreferences.menuFontSize;
this.label.isBold = true;
this.label.color = WHITE;
this.add(this.label);

// properties list
for (property in this.target) {
if (property) { // dummy condition, to be refined
attribs.push(property);
}
}
if (this.showing === 'attributes') {
attribs = attribs.filter(
prop => typeof this.target[prop] !== 'function'
);
} else if (this.showing === 'methods') {
attribs = attribs.filter(
prop => typeof this.target[prop] === 'function'
);
} // otherwise show all properties

doubleClickAction = () => {
var world, inspector;
if (!isObject(this.currentProperty)) {return; }
world = this.world();
inspector = new InspectorMorph(
this.currentProperty
);
inspector.setPosition(world.hand.position());
inspector.keepWithin(world);
world.add(inspector);
inspector.changed();
};

this.list = new ListMorph(
this.target instanceof Array ? attribs : attribs.sort(),
null, // label getter
this.markOwnProperties ?
[ // format list
[ // format element: [color, predicate(element]
new Color(0, 0, 180),
element => {
return Object.prototype.hasOwnProperty.call(
this.target,
element
);
}
]
]
: null,
doubleClickAction
);

this.list.action = () => {
this.hasUserEditedDetails = false;
this.updateCurrentSelection();
};

this.list.hBar.alpha = 0.6;
this.list.vBar.alpha = 0.6;
this.list.contents.step = null;
this.add(this.list);

// details pane
this.detail = new ScrollFrameMorph();
this.detail.acceptsDrops = false;
this.detail.contents.acceptsDrops = false;
this.detail.isTextLineWrapping = true;
this.detail.color = WHITE;
this.detail.hBar.alpha = 0.6;
this.detail.vBar.alpha = 0.6;
ctrl = new TextMorph('');
ctrl.isEditable = true;
ctrl.enableSelecting();
ctrl.setReceiver(this.target);
this.detail.setContents(ctrl);
this.add(this.detail);

// work ('evaluation') pane
// don't refresh the work pane if it already exists
if (this.work === null) {
this.work = new ScrollFrameMorph();
this.work.acceptsDrops = false;
this.work.contents.acceptsDrops = false;
this.work.isTextLineWrapping = true;
this.work.color = WHITE;
this.work.hBar.alpha = 0.6;
this.work.vBar.alpha = 0.6;
ev = new TextMorph('');
ev.isEditable = true;
ev.enableSelecting();
ev.setReceiver(this.target);
this.work.setContents(ev);
}
this.add(this.work);

// properties button
this.buttonSubset = new TriggerMorph();
this.buttonSubset.labelString = 'show...';
this.buttonSubset.createLabel();
this.buttonSubset.action = () => {
var menu;
menu = new MenuMorph();
menu.addItem(
'attributes',
() => {
this.showing = 'attributes';
this.buildPanes();
}
);
menu.addItem(
'methods',
() => {
this.showing = 'methods';
this.buildPanes();
}
);
menu.addItem(
'all',
() => {
this.showing = 'all';
this.buildPanes();
}
);
menu.addLine();
menu.addItem(
(this.markOwnProperties ?
'un-mark own' : 'mark own'),
() => {
this.markOwnProperties = !this.markOwnProperties;
this.buildPanes();
},
'highlight\n\'own\' properties'
);
menu.popUpAtHand(this.world());
};

this.add(this.buttonSubset);

// inspect button
this.buttonInspect = new TriggerMorph();
this.buttonInspect.labelString = 'inspect...';
this.buttonInspect.createLabel();
this.buttonInspect.action = () => {
var menu, world, inspector;
if (isObject(this.currentProperty)) {
menu = new MenuMorph();
menu.addItem(
'in new inspector...',
() => {
world = this.world();
inspector = new InspectorMorph(
this.currentProperty
);
inspector.setPosition(world.hand.position());
inspector.keepWithin(world);
world.add(inspector);
inspector.changed();
}
);
menu.addItem(
'here...',
() => this.setTarget(this.currentProperty)
);
menu.popUpAtHand(this.world());
} else {
this.inform(
(this.currentProperty === null ?
'null' : typeof this.currentProperty) +
'\nis not inspectable'
);
}
};
this.add(this.buttonInspect);

// edit button
this.buttonEdit = new TriggerMorph();
this.buttonEdit.labelString = 'edit...';
this.buttonEdit.createLabel();
this.buttonEdit.action = () => {
var menu = new MenuMorph(this);
menu.addItem("save", 'save', 'accept changes');
menu.addLine();
menu.addItem("add property...", 'addProperty');
menu.addItem("rename...", 'renameProperty');
menu.addItem("remove...", 'removeProperty');
menu.popUpAtHand(this.world());
};
this.add(this.buttonEdit);

// close button
this.buttonClose = new TriggerMorph();
this.buttonClose.labelString = 'close';
this.buttonClose.createLabel();
this.buttonClose.action = () => this.destroy();
this.add(this.buttonClose);

// resizer
this.resizer = new HandleMorph(
this,
150,
100,
this.edge,
this.edge
);

// update layout
this.fixLayout();
};

InspectorMorph.prototype.fixLayout = function () {
var x, y, r, b, w, h;

// label
x = this.left() + this.edge;
y = this.top() + this.edge;
r = this.right() - this.edge;
w = r - x;
this.label.setPosition(new Point(x, y));
this.label.setWidth(w);
if (this.label.height() > (this.height() - 50)) {
this.bounds.setHeight(this.label.height() + 50);
}

// list
y = this.label.bottom() + 2;
w = Math.min(
Math.floor(this.width() / 3),
this.list.listContents.width()
);

w -= this.edge;
b = this.bottom() - (2 * this.edge) -
MorphicPreferences.handleSize;
h = b - y;
this.list.setPosition(new Point(x, y));
this.list.setExtent(new Point(w, h));

// detail
x = this.list.right() + this.edge;
r = this.right() - this.edge;
w = r - x;
this.detail.setPosition(new Point(x, y));
this.detail.setExtent(new Point(w, (h * 2 / 3) - this.edge));

// work
y = this.detail.bottom() + this.edge;
this.work.setPosition(new Point(x, y));
this.work.setExtent(new Point(w, h / 3));

// properties button
x = this.list.left();
y = this.list.bottom() + this.edge;
w = this.list.width();
h = MorphicPreferences.handleSize;
this.buttonSubset.setPosition(new Point(x, y));
this.buttonSubset.setExtent(new Point(w, h));

// inspect button
x = this.detail.left();
w = this.detail.width() - this.edge -
MorphicPreferences.handleSize;
w = w / 3 - this.edge / 3;
this.buttonInspect.setPosition(new Point(x, y));
this.buttonInspect.setExtent(new Point(w, h));

// edit button
x = this.buttonInspect.right() + this.edge;
this.buttonEdit.setPosition(new Point(x, y));
this.buttonEdit.setExtent(new Point(w, h));

// close button
x = this.buttonEdit.right() + this.edge;
r = this.detail.right() - this.edge -
MorphicPreferences.handleSize;
w = r - x;
this.buttonClose.setPosition(new Point(x, y));
this.buttonClose.setExtent(new Point(w, h));

// resizer
this.resizer.fixLayout();
};

// InspectorMorph editing ops:

InspectorMorph.prototype.save = function () {
var txt = this.detail.contents.children[0].text.toString(),
prop = this.list.selected;
try {
this.target.evaluateString('this.' + prop + ' = ' + txt);
this.hasUserEditedDetails = false;
this.target.changed();
} catch (err) {
this.inform(err);
}
};

InspectorMorph.prototype.addProperty = function () {
this.prompt(
'new property name:',
prop => {
if (prop) {
this.target[prop] = null;
this.buildPanes();
this.target.changed();
}
},
this,
'property'
);
};

InspectorMorph.prototype.renameProperty = function () {
var propertyName = this.list.selected;
this.prompt(
'property name:',
prop => {
try {
delete (this.target[propertyName]);
this.target[prop] = this.currentProperty;
} catch (err) {
this.inform(err);
}
this.buildPanes();
this.target.changed();
},
this,
propertyName
);
};

InspectorMorph.prototype.removeProperty = function () {
var prop = this.list.selected;
try {
delete (this.target[prop]);
this.currentProperty = null;
this.buildPanes();
this.target.changed();
} catch (err) {
this.inform(err);
}
};

// InspectorMorph stepping

InspectorMorph.prototype.step = function () {
this.updateCurrentSelection();
var lbl = this.target.toString();
if (this.label.text === lbl) {return; }
this.label.text = lbl;
this.fixLayout();
};

// InspectorMorph duplicating:

InspectorMorph.prototype.updateReferences = function (map) {
var active = this.list.activeIndex();
InspectorMorph.uber.updateReferences.call(this, map);
this.buildPanes();
this.list.activateIndex(active);
};

// MenuMorph ///////////////////////////////////////////////////////////

// MenuMorph: referenced constructors

var MenuItemMorph;

// MenuMorph inherits from BoxMorph:

MenuMorph.prototype = new BoxMorph();
MenuMorph.prototype.constructor = MenuMorph;
MenuMorph.uber = BoxMorph.prototype;

// MenuMorph instance creation:

function MenuMorph(target, title, environment, fontSize) {
this.init(target, title, environment, fontSize);

/*
if target is a function, use it as callback:
execute target as callback function with the action property
of the triggered MenuItem as argument.
Use the environment, if it is specified.
Note: if action is also a function, instead of becoming
the argument itself it will be called to answer the argument.
For selections, Yes/No Choices etc.

else (if target is not a function):

if action is a function:
execute the action with target as environment (can be null)
for lambdafied (inline) actions

else if action is a String:
treat it as function property of target and execute it
for selector-like actions
*/
}

MenuMorph.prototype.init = function (target, title, environment, fontSize) {
// additional properties:
this.target = target;
this.title = title || null;
this.environment = environment || null;
this.fontSize = fontSize || null;
this.items = [];
this.label = null;
this.world = null;
this.isListContents = false;
this.hasFocus = false;
this.selection = null;
this.submenu = null;

// initialize inherited properties:
MenuMorph.uber.init.call(this);

// override inherited properties:
this.isDraggable = false;
this.noDropShadow = true;
this.fullShadowSource = false;

// immutable properties:
this.border = null;
this.edge = null;
};

MenuMorph.prototype.addItem = function (
labelString,
action,
hint,
color,
bold, // bool
italic, // bool
doubleClickAction, // optional, when used as list contents
shortcut, // optional string, icon (Morph or Canvas) or tuple [icon, string]
verbatim // optional bool, don't translate if true
) {
/*
labelString is normally a single-line string. But it can also be one
of the following:

* a multi-line string (containing line breaks)
* an icon (either a Morph or a Canvas)
* a tuple of format: [icon, string]
*/
this.items.push([
verbatim ? labelString || 'close' : localize(labelString || 'close'),
action === 0 ? 0 : action || nop,
hint,
color,
bold || false,
italic || false,
doubleClickAction,
shortcut,
verbatim]);
};

MenuMorph.prototype.addMenu = function (label, aMenu, indicator, verbatim) {
this.addPair(
label,
aMenu,
isNil(indicator) ? '\u25ba' : indicator,
null,
verbatim // don't translate
);
};

MenuMorph.prototype.addPair = function (
label,
action,
shortcut,
hint,
verbatim // don't translate
) {
this.addItem(
label,
action,
hint,
null,
null,
null,
null,
shortcut,
verbatim
);
};

MenuMorph.prototype.addLine = function (width) {
this.items.push([0, width || 1]);
};

MenuMorph.prototype.createLabel = function () {
var text;
if (this.label !== null) {
this.label.destroy();
}
text = new TextMorph(
localize(this.title),
this.fontSize || MorphicPreferences.menuFontSize,
MorphicPreferences.menuFontName,
true,
false,
'center'
);
text.alignment = 'center';
text.color = WHITE;
text.backgroundColor = this.borderColor;
text.fixLayout();
this.label = new BoxMorph(3, 0);
if (MorphicPreferences.isFlat) {
this.label.edge = 0;
}
this.label.color = this.borderColor;
this.label.borderColor = this.borderColor;
this.label.setExtent(text.extent().add(4));
this.label.add(text);
this.label.text = text;
};

MenuMorph.prototype.createItems = function () {
var item,
fb,
x,
y,
isLine = false;

this.children.forEach(m => m.destroy());
this.children = [];
if (!this.isListContents) {
this.edge = MorphicPreferences.isFlat ? 0 : 5;
this.border = MorphicPreferences.isFlat ? 1 : 2;
}
this.color = WHITE;
this.borderColor = new Color(60, 60, 60);
this.setExtent(new Point(0, 0));

y = 2;
x = this.left() + 4;
if (!this.isListContents) {
if (this.title) {
this.createLabel();
this.label.setPosition(this.bounds.origin.add(4));
this.add(this.label);
y = this.label.bottom();
} else {
y = this.top() + 4;
}
}
y += 1;
this.items.forEach(tuple => {
isLine = false;
if (tuple instanceof StringFieldMorph ||
tuple instanceof ColorPickerMorph ||
tuple instanceof SliderMorph ||
tuple instanceof DialMorph) {
item = tuple;
} else if (tuple[0] === 0) {
isLine = true;
item = new Morph();
item.color = this.borderColor;
item.setHeight(tuple[1]);
} else {
item = new MenuItemMorph(
this.target,
tuple[1],
tuple[0],
this.fontSize || MorphicPreferences.menuFontSize,
MorphicPreferences.menuFontName,
this.environment,
tuple[2], // bubble help hint
tuple[3], // color
tuple[4], // bold
tuple[5], // italic
tuple[6], // doubleclick action
tuple[7] // shortcut
);
}
if (isLine) {
y += 1;
}
item.setPosition(new Point(x, y));
this.add(item);
y = y + item.height();
if (isLine) {
y += 1;
}
});

fb = this.fullBounds();
this.setExtent(fb.extent().add(4));
this.adjustWidths();
};

MenuMorph.prototype.maxWidth = function () {
var w = 0;

if (this.parent instanceof FrameMorph) {
if (this.parent.scrollFrame instanceof ScrollFrameMorph) {
w = this.parent.scrollFrame.width();
}
}
this.children.forEach(item => {
if (item instanceof MenuItemMorph) {
w = Math.max(
w,
item.label.width() + 8 +
(item.shortcut ? item.shortcut.width() + 4 : 0)
);
} else if ((item instanceof StringFieldMorph) ||
(item instanceof ColorPickerMorph) ||
(item instanceof SliderMorph) ||
(item instanceof DialMorph)) {
w = Math.max(w, item.width());
}
});
if (this.label) {
w = Math.max(w, this.label.width());
}
return w;
};

MenuMorph.prototype.adjustWidths = function () {
var w = this.maxWidth();
this.children.forEach(item => {
if (!(item instanceof DialMorph)) {
item.setWidth(w);
}
item.fixLayout();
if (item === this.label) {
item.text.setPosition(
item.center().subtract(
item.text.extent().floorDivideBy(2)
)
);
}
});
};

MenuMorph.prototype.unselectAllItems = function () {
this.children.forEach(item => {
if (item instanceof MenuItemMorph) {
if (item.userState !== 'normal') {
item.userState = 'normal';
item.rerender();
}
} else if (item instanceof ScrollFrameMorph) {
item.contents.children.forEach(morph => {
if (morph instanceof MenuItemMorph &&
morph.userState !== 'normal') {
morph.userState = 'normal';
morph.rerender();
}
});
}
});
};

// MenuMorph popping up

MenuMorph.prototype.popup = function (world, pos) {
var scroller;

this.createItems();
this.setPosition(pos);
this.addShadow(new Point(2, 2), 80);
this.keepWithin(world);

if (this.bottom() > world.bottom()) {
// scroll menu items if the menu is taller than the world
this.removeShadow();
scroller = this.scroll();
this.bounds.corner.y = world.bottom() - 2;
this.addShadow(new Point(2, 2), 80);
scroller.setHeight(world.bottom() - scroller.top() - 6);
scroller.adjustScrollBars(); // ?
}

if (world.activeMenu) {
world.activeMenu.destroy();
}
if (this.items.length < 1 && !this.title) { // don't show empty menus
return;
}
world.add(this);
world.activeMenu = this;
this.world = world; // optionally enable keyboard support
this.fullChanged();
};

MenuMorph.prototype.scroll = function () {
// private - move all items into a scroll frame
var scroller = new ScrollFrameMorph(),
start = this.label ? 1 : 0,
first = this.children[start];

scroller.setPosition(first.position());
this.children.slice(start).forEach(morph => scroller.addContents(morph));
this.add(scroller);
scroller.setWidth(first.width());
return scroller;
};

MenuMorph.prototype.popUpAtHand = function (world) {
var wrrld = world || this.world;
this.popup(wrrld, wrrld.hand.position());
};

MenuMorph.prototype.popUpCenteredAtHand = function (world) {
var wrrld = world || this.world;
this.fixLayout();
this.createItems();
this.popup(
wrrld,
wrrld.hand.position().subtract(
this.extent().floorDivideBy(2)
)
);
};

MenuMorph.prototype.popUpCenteredInWorld = function (world) {
var wrrld = world || this.world;
this.fixLayout();
this.createItems();
this.popup(
wrrld,
wrrld.center().subtract(
this.extent().floorDivideBy(2)
)
);
};

// MenuMorph submenus

MenuMorph.prototype.closeRootMenu = function () {
if (this.parent instanceof MenuMorph) {
this.parent.closeRootMenu();
} else {
this.destroy();
}
};

MenuMorph.prototype.closeSubmenu = function () {
if (this.submenu) {
this.submenu.destroy();
this.submenu = null;
this.unselectAllItems();
this.world.activeMenu = this;
}
};

// MenuMorph keyboard accessibility

MenuMorph.prototype.getFocus = function () {
this.world.keyboardFocus = this;
this.selection = null;
this.selectFirst();
this.hasFocus = true;
};

MenuMorph.prototype.processKeyDown = function (event) {
// console.log(event.keyCode);
switch (event.keyCode) {
case 13: // 'enter'
case 32: // 'space'
if (this.selection) {
this.selection.mouseClickLeft();
if (this.submenu) {
this.submenu.getFocus();
}
}
return;
case 27: // 'esc'
return this.destroy();
case 37: // 'left arrow'
return this.leaveSubmenu();
case 38: // 'up arrow'
return this.selectUp();
case 39: // 'right arrow'
return this.enterSubmenu();
case 40: // 'down arrow'
return this.selectDown();
default:
nop();
}
};

MenuMorph.prototype.processKeyUp = function (event) {
nop(event);
};

MenuMorph.prototype.processKeyPress = function (event) {
nop(event);
};

MenuMorph.prototype.selectFirst = function () {
var scroller, items, i;

scroller = detect(
this.children,
morph => morph instanceof ScrollFrameMorph
);
items = scroller ? scroller.contents.children : this.children;
for (i = 0; i < items.length; i += 1) {
if (items[i] instanceof MenuItemMorph) {
this.select(items[i]);
return;
}
}
};

MenuMorph.prototype.selectUp = function () {
var scroller, triggers, idx;

scroller = detect(
this.children,
morph => morph instanceof ScrollFrameMorph
);
triggers = (scroller ? scroller.contents.children : this.children).filter(
each => each instanceof MenuItemMorph
);
if (!this.selection) {
if (triggers.length) {
this.select(triggers[0]);
}
return;
}
idx = triggers.indexOf(this.selection) - 1;
if (idx < 0) {
idx = triggers.length - 1;
}
this.select(triggers[idx]);
};

MenuMorph.prototype.selectDown = function () {
var scroller, triggers, idx;

scroller = detect(
this.children,
morph => morph instanceof ScrollFrameMorph
);
triggers = (scroller ? scroller.contents.children : this.children).filter(
each => each instanceof MenuItemMorph
);
if (!this.selection) {
if (triggers.length) {
this.select(triggers[0]);
}
return;
}
idx = triggers.indexOf(this.selection) + 1;
if (idx >= triggers.length) {
idx = 0;
}
this.select(triggers[idx]);
};

MenuMorph.prototype.enterSubmenu = function () {
if (this.selection && this.selection.action instanceof MenuMorph) {
this.selection.popUpSubmenu();
if (this.submenu) {
this.submenu.getFocus();
}
}
};

MenuMorph.prototype.leaveSubmenu = function () {
var menu = this.parent;
if (this.parent instanceof MenuMorph) {
menu.submenu = null;
menu.hasFocus = true;
this.destroy();
menu.world.keyboardFocus = menu;
menu.world.activeMenu = menu;
}
};

MenuMorph.prototype.select = function (aMenuItem) {
this.unselectAllItems();
aMenuItem.userState = 'highlight';
aMenuItem.rerender();
aMenuItem.scrollIntoView();
this.selection = aMenuItem;
};

MenuMorph.prototype.destroy = function () {
if (this.hasFocus) {
this.world.keyboardFocus = null;
}
if (!this.isListContents && (this.world.activeMenu === this)) {
this.world.activeMenu = null;
}
MenuMorph.uber.destroy.call(this);
};

// StringMorph /////////////////////////////////////////////////////////

// I am a single line of text

// StringMorph inherits from Morph:

StringMorph.prototype = new Morph();
StringMorph.prototype.constructor = StringMorph;
StringMorph.uber = Morph.prototype;

// StringMorph shared properties:

// context for measuring text dimensions, used by StringMorphs and TextMorphs
StringMorph.prototype.measureCtx = newCanvas().getContext("2d");

// StringMorph instance creation:

function StringMorph(
text,
fontSize,
fontStyle,
bold,
italic,
isNumeric,
shadowOffset,
shadowColor,
color,
fontName
) {
this.init(
text,
fontSize,
fontStyle,
bold,
italic,
isNumeric,
shadowOffset,
shadowColor,
color,
fontName
);
}

StringMorph.prototype.init = function (
text,
fontSize,
fontStyle,
bold,
italic,
isNumeric,
shadowOffset,
shadowColor,
color,
fontName
) {
// additional properties:
this.text = text || ((text === '') ? '' : 'StringMorph');
this.fontSize = fontSize || 12;
this.fontName = fontName || MorphicPreferences.globalFontFamily;
this.fontStyle = fontStyle || 'sans-serif';
this.isBold = bold || false;
this.isItalic = italic || false;
this.isEditable = false;
this.enableLinks = false; // set to "true" if I can contain clickable URLs
this.isNumeric = isNumeric || false;
this.isPassword = false;
this.shadowOffset = shadowOffset || ZERO;
this.shadowColor = shadowColor || null;
this.isShowingBlanks = false;
this.blanksColor = new Color(180, 140, 140);

// additional properties for text-editing:
this.isScrollable = true; // scrolls into view when edited
this.currentlySelecting = false;
this.startMark = 0;
this.endMark = 0;
this.markedTextColor = WHITE;
this.markedBackgoundColor = new Color(60, 60, 120);

// initialize inherited properties:
StringMorph.uber.init.call(this, true);

// override inherited properites:
this.color = color || new Color(0, 0, 0);
this.fixLayout(); // determine my extent
};

StringMorph.prototype.toString = function () {
// e.g. 'a StringMorph("Hello World")'
return 'a ' +
(this.constructor.name ||
this.constructor.toString().split(' ')[1].split('(')[0]) +
'("' + this.text.slice(0, 30) + '...")';
};

StringMorph.prototype.password = function (letter, length) {
var ans = '',
i;
for (i = 0; i < length; i += 1) {
ans += letter;
}
return ans;
};

StringMorph.prototype.font = function () {
// answer a font string, e.g. 'bold italic 12px sans-serif'
var font = '';
if (this.isBold) {
font = font + 'bold ';
}
if (this.isItalic) {
font = font + 'italic ';
}
return font +
this.fontSize + 'px ' +
(this.fontName ? this.fontName + ', ' : '') +
this.fontStyle;
};

StringMorph.prototype.getShadowRenderColor = function () {
// answer the shadow rendering color, can be overridden for my children
return this.shadowColor;
};

StringMorph.prototype.fixLayout = function (justMe) {
// determine my extent depending on my current settings
var width,
shadowOffset = this.shadowOffset || ZERO,
txt = this.isPassword ?
this.password('*', this.text.length) : this.text;

this.measureCtx.font = this.font();
width = Math.max(
this.measureCtx.measureText(txt).width + Math.abs(shadowOffset.x),
1
);
this.bounds.corner = this.bounds.origin.add(
new Point(
width,
fontHeight(this.fontSize) + Math.abs(shadowOffset.y)
)
);

// notify my parent of layout change
if (!justMe && this.parent) {
if (this.parent.fixLayout) {
this.parent.fixLayout();
}
}
};

StringMorph.prototype.render = function (ctx) {
var start, stop, i, p, c, x, y,
shadowOffset = this.shadowOffset || ZERO,
shadowColor = this.getShadowRenderColor(),
txt = this.isPassword ?
this.password('*', this.text.length) : this.text;

// prepare context for drawing text
ctx.font = this.font();
ctx.textAlign = 'left';
ctx.textBaseline = 'bottom';

// first draw the shadow, if any
if (shadowColor) {
x = Math.max(shadowOffset.x, 0);
y = Math.max(shadowOffset.y, 0);
ctx.fillStyle = shadowColor.toString();
ctx.fillText(txt, x, fontHeight(this.fontSize) + y);
}

// now draw the actual text
x = Math.abs(Math.min(shadowOffset.x, 0));
y = Math.abs(Math.min(shadowOffset.y, 0));
ctx.fillStyle = this.getRenderColor().toString();

if (this.isShowingBlanks) {
this.renderWithBlanks(
ctx,
x,
fontHeight(this.fontSize) + y
);
} else {
ctx.fillText(
txt,
x,
fontHeight(this.fontSize) + y
);
}

// draw the selection
start = Math.min(this.startMark, this.endMark);
stop = Math.max(this.startMark, this.endMark);
for (i = start; i < stop; i += 1) {
p = this.slotPosition(i).subtract(this.position());
c = txt.charAt(i);
ctx.fillStyle = this.markedBackgoundColor.toString();
ctx.fillRect(p.x, p.y, ctx.measureText(c).width + 1 + x,
fontHeight(this.fontSize) + y);
ctx.fillStyle = this.markedTextColor.toString();
ctx.fillText(c, p.x, fontHeight(this.fontSize) + p.y);
}
};

StringMorph.prototype.renderWithBlanks = function (ctx, startX, y) {
var space = ctx.measureText(' ').width,
blanksColor = this.blanksColor.toString(),
top = y - this.height() / 2,
words = this.text.split(' '),
x = startX || 0,
isFirst = true;

function drawBlank() {
ctx.fillStyle = blanksColor;
ctx.beginPath();
ctx.arc(
x + space / 2,
top,
space / 2,
radians(0),
radians(360)
);
ctx.fill();
x += space;
}

// render my text inserting blanks
words.forEach(word => {
if (!isFirst) {
drawBlank();
}
isFirst = false;
if (word !== '') {
ctx.fillStyle = this.getRenderColor().toString();
ctx.fillText(word, x, y);
x += ctx.measureText(word).width;
}
});
};

// StringMorph measuring:

StringMorph.prototype.slotPosition = function (slot) {
// answer the position point of the given index ("slot")
// where the cursor should be placed
var txt = this.isPassword ?
this.password('*', this.text.length) : this.text,
dest = Math.min(Math.max(slot, 0), txt.length);

this.measureCtx.font = this.font();
this.pos = dest;
return new Point(
this.left() + this.measureCtx.measureText(txt.slice(0, dest)).width,
this.top()
);
};

StringMorph.prototype.slotAt = function (aPoint) {
// answer the slot (index) closest to the given point taking
// in account how far from the middle of the character it is,
// so the cursor can be moved accordingly

var txt = this.isPassword ?
this.password('*', this.text.length) : this.text,
idx = 0,
charX = 0;

this.measureCtx.font = this.font();
while (aPoint.x - this.left() > charX) {
charX += this.measureCtx.measureText(txt[idx]).width;
idx += 1;
if (idx === txt.length) {
if ((this.measureCtx.measureText(txt).width -
(this.measureCtx.measureText(txt[idx - 1]).width / 2)) <
(aPoint.x - this.left())) {
return idx;
}
}
}

// see where our click fell with respect to the middle of the char
if (aPoint.x - this.left() >
charX - this.measureCtx.measureText(txt[idx - 1]).width / 2) {
return idx;
} else {
return idx - 1;
}
};

StringMorph.prototype.upFrom = function (slot) {
// answer the slot above the given one
return slot;
};

StringMorph.prototype.downFrom = function (slot) {
// answer the slot below the given one
return slot;
};

StringMorph.prototype.startOfLine = function () {
// answer the first slot (index) of the line for the given slot
return 0;
};

StringMorph.prototype.endOfLine = function () {
// answer the slot (index) indicating the EOL for the given slot
return this.text.length;
};

StringMorph.prototype.previousWordFrom = function (aSlot) {
// answer the slot (index) slots indicating the position of the
// previous word to the left of aSlot
var index = aSlot - 1;

// while the current character is non-word one, we skip it, so that
// if we are in the middle of a non-alphanumeric sequence, we'll get
// right to the beginning of the previous word
while (index > 0 && !isWordChar(this.text[index])) {
index -= 1;
}

// while the current character is a word one, we skip it until we
// find the beginning of the current word
while (index > 0 && isWordChar(this.text[index - 1])) {
index -= 1;
}

return index;
};

StringMorph.prototype.nextWordFrom = function (aSlot) {
var index = aSlot;

while (index < this.endOfLine() && !isWordChar(this.text[index])) {
index += 1;
}

while (index < this.endOfLine() && isWordChar(this.text[index])) {
index += 1;
}

return index;
};

StringMorph.prototype.rawHeight = function () {
// answer my corrected fontSize
return this.height() / 1.2;
};

// StringMorph menus:

StringMorph.prototype.developersMenu = function () {
var menu = StringMorph.uber.developersMenu.call(this);

menu.addLine();
menu.addItem("edit", 'edit');
menu.addItem(
"font size...",
() => {
this.prompt(
menu.title + '\nfont\nsize:',
this.setFontSize,
this,
this.fontSize.toString(),
null,
6,
500,
true
);
},
'set this String\'s\nfont point size'
);
if (this.fontStyle !== 'serif') {
menu.addItem("serif", 'setSerif');
}
if (this.fontStyle !== 'sans-serif') {
menu.addItem("sans-serif", 'setSansSerif');
}
if (this.isBold) {
menu.addItem("normal weight", 'toggleWeight');
} else {
menu.addItem("bold", 'toggleWeight');
}
if (this.isItalic) {
menu.addItem("normal style", 'toggleItalic');
} else {
menu.addItem("italic", 'toggleItalic');
}
if (this.isShowingBlanks) {
menu.addItem("hide blanks", 'toggleShowBlanks');
} else {
menu.addItem("show blanks", 'toggleShowBlanks');
}
if (this.isPassword) {
menu.addItem("show characters", 'toggleIsPassword');
} else {
menu.addItem("hide characters", 'toggleIsPassword');
}
return menu;
};

StringMorph.prototype.toggleIsDraggable = function () {
// for context menu demo purposes
this.isDraggable = !this.isDraggable;
if (this.isDraggable) {
this.disableSelecting();
} else {
this.enableSelecting();
}
};

StringMorph.prototype.toggleShowBlanks = function () {
this.isShowingBlanks = !this.isShowingBlanks;
this.changed();
this.fixLayout();
this.rerender();
};

StringMorph.prototype.toggleWeight = function () {
this.isBold = !this.isBold;
this.changed();
this.fixLayout();
this.rerender();
};

StringMorph.prototype.toggleItalic = function () {
this.isItalic = !this.isItalic;
this.changed();
this.fixLayout();
this.rerender();
};

StringMorph.prototype.toggleIsPassword = function () {
this.isPassword = !this.isPassword;
this.changed();
this.fixLayout();
this.rerender();
};

StringMorph.prototype.setSerif = function () {
this.fontStyle = 'serif';
this.changed();
this.fixLayout();
this.rerender();
};

StringMorph.prototype.setSansSerif = function () {
this.fontStyle = 'sans-serif';
this.changed();
this.fixLayout();
this.rerender();
};

StringMorph.prototype.setFontSize = function (size) {
// for context menu demo purposes
var newSize;
if (typeof size === 'number') {
this.fontSize = Math.round(Math.min(Math.max(size, 4), 500));
} else {
newSize = parseFloat(size);
if (!isNaN(newSize)) {
this.fontSize = Math.round(
Math.min(Math.max(newSize, 4), 500)
);
}
}
this.changed();
this.fixLayout();
this.rerender();
};

StringMorph.prototype.setText = function (size) {
// for context menu demo purposes
this.text = Math.round(size).toString();
this.changed();
this.fixLayout();
this.rerender();
};

StringMorph.prototype.numericalSetters = function () {
// for context menu demo purposes
return [
'setLeft',
'setTop',
'setAlphaScaled',
'setFontSize',
'setText'
];
};

// StringMorph editing:

StringMorph.prototype.edit = function () {
this.root().edit(this);
};

StringMorph.prototype.selection = function () {
var start, stop;
start = Math.min(this.startMark, this.endMark);
stop = Math.max(this.startMark, this.endMark);
return this.text.slice(start, stop);
};

StringMorph.prototype.selectionStartSlot = function () {
return Math.min(this.startMark, this.endMark);
};

StringMorph.prototype.clearSelection = function () {
if (!this.currentlySelecting &&
isNil(this.startMark) &&
isNil(this.endMark)) {
return;
}
this.currentlySelecting = false;
this.startMark = null;
this.endMark = null;
this.changed();
};

StringMorph.prototype.deleteSelection = function () {
var start, stop, text;
text = this.text;
start = Math.min(this.startMark, this.endMark);
stop = Math.max(this.startMark, this.endMark);
this.text = text.slice(0, start) + text.slice(stop);
this.changed();
this.clearSelection();
};

StringMorph.prototype.selectAll = function () {
var cursor;
if (this.isEditable) {
this.startMark = 0;
cursor = this.root().cursor;
this.endMark = this.text.length;
if (cursor) {
cursor.gotoSlot(this.text.length);
cursor.syncTextareaSelectionWith(this);
}
this.fixLayout();
this.rerender();
}
};

StringMorph.prototype.mouseDownLeft = function (pos) {
if (this.world().currentKey === 16) {
this.shiftClick(pos);
} else if (this.isEditable) {
this.clearSelection();
} else {
this.escalateEvent('mouseDownLeft', pos);
}
};

StringMorph.prototype.shiftClick = function (pos) {
var cursor = this.root().cursor;

if (cursor) {
if (!this.startMark) {
this.startMark = cursor.slot;
}
cursor.gotoPos(pos);
this.endMark = cursor.slot;
cursor.syncTextareaSelectionWith(this);
this.changed();
}
this.currentlySelecting = false;
this.escalateEvent('mouseDownLeft', pos);
};

StringMorph.prototype.mouseClickLeft = function (pos) {
var cursor,
slot,
clickedText,
startMark,
endMark;

if (this.isEditable) {
if (!this.currentlySelecting) {
this.edit(); // creates a new cursor
}
cursor = this.root().cursor;
if (cursor) {
cursor.gotoPos(pos);
}
this.currentlySelecting = true;
} else if (this.enableLinks) {
slot = this.slotAt(pos);
if (slot === this.text.length) {
slot -= 1;
}
startMark = slot;
while (startMark > 1 && isURLChar(this.text[startMark-1])) {
startMark -= 1;
}
endMark = slot;
while (endMark < this.text.length - 1 &&
isURLChar(this.text[endMark + 1])) {
endMark += 1;
}
clickedText = this.text.substring(startMark, endMark + 1);
if (isURL(clickedText)) {
window.open(clickedText, '_blank');
} else {
this.escalateEvent('mouseClickLeft', pos);
}
} else {
this.escalateEvent('mouseClickLeft', pos);
}
};

StringMorph.prototype.mouseDoubleClick = function (pos) {
// selects the word at pos
// if there is no word, we select whatever is between
// the previous and next words
var slot = this.slotAt(pos);

if (this.isEditable) {
this.edit();

if (slot === this.text.length) {
slot -= 1;
}

if (this.text[slot] && isWordChar(this.text[slot])) {
this.selectWordAt(slot);
} else if (this.text[slot]) {
this.selectBetweenWordsAt(slot);
} else {
// special case for when we click right after the
// last slot in multi line TextMorphs
this.selectAll();
}
this.root().cursor.syncTextareaSelectionWith(this);
} else {
this.escalateEvent('mouseDoubleClick', pos);
}
};

StringMorph.prototype.selectWordAt = function (slot) {
var cursor = this.root().cursor;

if (slot === 0 || isWordChar(this.text[slot - 1])) {
cursor.gotoSlot(this.previousWordFrom(slot));
this.startMark = cursor.slot;
this.endMark = this.nextWordFrom(cursor.slot);
} else {
cursor.gotoSlot(slot);
this.startMark = slot;
this.endMark = this.nextWordFrom(slot);
}
this.changed();
};

StringMorph.prototype.selectBetweenWordsAt = function (slot) {
var cursor = this.root().cursor;

cursor.gotoSlot(this.nextWordFrom(this.previousWordFrom(slot)));
this.startMark = cursor.slot;
this.endMark = cursor.slot;

while (this.endMark < this.text.length
&& !isWordChar(this.text[this.endMark])) {
this.endMark += 1;
}
this.changed();
};

StringMorph.prototype.enableSelecting = function () {
this.mouseDownLeft = function (pos) {
var crs = this.root().cursor,
already = crs ? crs.target === this : false;
if (this.world().currentKey === 16) {
this.shiftClick(pos);
} else {
this.clearSelection();
if (this.isEditable && (!this.isDraggable)) {
this.edit();
this.root().cursor.gotoPos(pos);
this.startMark = this.slotAt(pos);
this.endMark = this.startMark;
this.currentlySelecting = true;
this.root().cursor.syncTextareaSelectionWith(this);
if (!already) {this.escalateEvent('mouseDownLeft', pos); }
}
}
};
this.mouseMove = function (pos) {
if (this.isEditable &&
this.currentlySelecting &&
(!this.isDraggable)) {
var newMark = this.slotAt(pos);
if (newMark !== this.endMark) {
this.endMark = newMark;
this.root().cursor.syncTextareaSelectionWith(this);
this.changed();
}
}
};
};

StringMorph.prototype.disableSelecting = function () {
this.mouseDownLeft = StringMorph.prototype.mouseDownLeft;
delete this.mouseMove;
};

// TextMorph ////////////////////////////////////////////////////////////////

// I am a multi-line, word-wrapping String, quasi-inheriting from StringMorph

// TextMorph inherits from Morph:

TextMorph.prototype = new Morph();
TextMorph.prototype.constructor = TextMorph;
TextMorph.uber = Morph.prototype;

// TextMorph shared properties:

// context for measuring text dimensions, shared with StringMorph prototype
TextMorph.prototype.measureCtx = StringMorph.prototype.measureCtx;

// TextMorph instance creation:

function TextMorph(
text,
fontSize,
fontStyle,
bold,
italic,
alignment,
width,
fontName,
shadowOffset,
shadowColor
) {
this.init(text,
fontSize,
fontStyle,
bold,
italic,
alignment,
width,
fontName,
shadowOffset,
shadowColor);
}

TextMorph.prototype.init = function (
text,
fontSize,
fontStyle,
bold,
italic,
alignment,
width,
fontName,
shadowOffset,
shadowColor
) {
// additional properties:
this.text = text || (text === '' ? text : 'TextMorph');
this.words = [];
this.lines = [];
this.lineSlots = [];
this.fontSize = fontSize || 12;
this.fontName = fontName || MorphicPreferences.globalFontFamily;
this.fontStyle = fontStyle || 'sans-serif';
this.isBold = bold || false;
this.isItalic = italic || false;
this.alignment = alignment || 'left';
this.shadowOffset = shadowOffset || ZERO;
this.shadowColor = shadowColor || null;
this.maxWidth = width || 0;
this.maxLineWidth = 0;
this.backgroundColor = null;
this.isEditable = false;
this.enableLinks = false; // set to "true" if I can contain clickable URLs

//additional properties for ad-hoc evaluation:
this.receiver = null;

// additional properties for text-editing:
this.isScrollable = true; // scrolls into view when edited
this.currentlySelecting = false;
this.startMark = 0;
this.endMark = 0;
this.markedTextColor = WHITE;
this.markedBackgoundColor = new Color(60, 60, 120);

// initialize inherited properties:
TextMorph.uber.init.call(this);

// override inherited properites:
this.color = new Color(0, 0, 0);
this.fixLayout(); // determine my extent
};

TextMorph.prototype.toString = function () {
// e.g. 'a TextMorph("Hello World")'
return 'a TextMorph' + '("' + this.text.slice(0, 30) + '...")';
};

TextMorph.prototype.font = StringMorph.prototype.font;

TextMorph.prototype.parse = function () {
var paragraphs = this.text.split('\n'),
context = this.measureCtx,
oldline = '',
newline,
w,
slot = 0;

context.font = this.font();
this.maxLineWidth = 0;
this.lines = [];
this.lineSlots = [0];
this.words = [];

paragraphs.forEach(p => {
this.words = this.words.concat(p.split(' '));
this.words.push('\n');
});

this.words.forEach(word => {
if (word === '\n') {
this.lines.push(oldline);
this.lineSlots.push(slot);
this.maxLineWidth = Math.max(
this.maxLineWidth,
context.measureText(oldline).width
);
oldline = '';
} else {
if (this.maxWidth > 0) {
newline = oldline + word + ' ';
w = context.measureText(newline).width;
if (w > this.maxWidth) {
this.lines.push(oldline);
this.lineSlots.push(slot);
this.maxLineWidth = Math.max(
this.maxLineWidth,
context.measureText(oldline).width
);
oldline = word + ' ';
} else {
oldline = newline;
}
} else {
oldline = oldline + word + ' ';
}
slot += word.length + 1;
}
});
};

TextMorph.prototype.fixLayout = function () {
// determine my extent depending on my current settings
var height, shadowHeight, shadowWidth;

this.parse();

// set my extent
shadowWidth = Math.abs(this.shadowOffset.x);
shadowHeight = Math.abs(this.shadowOffset.y);
height = this.lines.length * (fontHeight(this.fontSize) + shadowHeight);
if (this.maxWidth === 0) {
this.bounds = this.bounds.origin.extent(
new Point(this.maxLineWidth + shadowWidth, height)
);
} else {
this.bounds = this.bounds.origin.extent(
new Point(this.maxWidth + shadowWidth, height)
);
}

// notify my parent of layout change
if (this.parent) {
if (this.parent.layoutChanged) {
this.parent.layoutChanged();
}
}
};

TextMorph.prototype.render = function (ctx) {
var shadowWidth = Math.abs(this.shadowOffset.x),
shadowHeight = Math.abs(this.shadowOffset.y),
shadowColor = this.getShadowRenderColor(),
i, line, width, offx, offy, x, y, start, stop, p, c;

// prepare context for drawing text
ctx.font = this.font();
ctx.textAlign = 'left';
ctx.textBaseline = 'bottom';

// fill the background, if desired
if (this.backgroundColor) {
ctx.fillStyle = this.backgroundColor.toString();
ctx.fillRect(0, 0, this.width(), this.height());
}

// draw the shadow, if any
if (shadowColor) {
offx = Math.max(this.shadowOffset.x, 0);
offy = Math.max(this.shadowOffset.y, 0);
ctx.fillStyle = shadowColor.toString();

for (i = 0; i < this.lines.length; i = i + 1) {
line = this.lines[i];
width = ctx.measureText(line).width + shadowWidth;
if (this.alignment === 'right') {
x = this.width() - width;
} else if (this.alignment === 'center') {
x = (this.width() - width) / 2;
} else { // 'left'
x = 0;
}
y = (i + 1) * (fontHeight(this.fontSize) + shadowHeight)
- shadowHeight;
ctx.fillText(line, x + offx, y + offy);
}
}

// now draw the actual text
offx = Math.abs(Math.min(this.shadowOffset.x, 0));
offy = Math.abs(Math.min(this.shadowOffset.y, 0));
ctx.fillStyle = this.getRenderColor().toString();

for (i = 0; i < this.lines.length; i = i + 1) {
line = this.lines[i];
width = ctx.measureText(line).width + shadowWidth;
if (this.alignment === 'right') {
x = this.width() - width;
} else if (this.alignment === 'center') {
x = (this.width() - width) / 2;
} else { // 'left'
x = 0;
}
y = (i + 1) * (fontHeight(this.fontSize) + shadowHeight) - shadowHeight;
ctx.fillText(line, x + offx, y + offy);
}

// draw the selection
start = Math.min(this.startMark, this.endMark);
stop = Math.max(this.startMark, this.endMark);
for (i = start; i < stop; i += 1) {
p = this.slotPosition(i).subtract(this.position());
c = this.text.charAt(i);
ctx.fillStyle = this.markedBackgoundColor.toString();
ctx.fillRect(p.x, p.y, ctx.measureText(c).width + 1,
fontHeight(this.fontSize));
ctx.fillStyle = this.markedTextColor.toString();
ctx.fillText(c, p.x, p.y + fontHeight(this.fontSize));
}
};

TextMorph.prototype.getShadowRenderColor =
StringMorph.prototype.getShadowRenderColor;

TextMorph.prototype.setExtent = function (aPoint) {
this.maxWidth = Math.max(aPoint.x, 0);
this.changed();
this.fixLayout();
this.rerender();
};

// TextMorph mesuring:

TextMorph.prototype.columnRow = function (slot) {
// answer the logical position point of the given index ("slot")
var row,
col,
idx = 0;

for (row = 0; row < this.lines.length; row += 1) {
idx = this.lineSlots[row];
for (col = 0; col < this.lines[row].length; col += 1) {
if (idx === slot) {
return new Point(col, row);
}
idx += 1;
}
}
// return new Point(0, 0);
return new Point(
this.lines[this.lines.length - 1].length - 1,
this.lines.length - 1
);
};

TextMorph.prototype.slotPosition = function (slot) {
// answer the physical position point of the given index ("slot")
// where the cursor should be placed
var colRow = this.columnRow(slot),
ctx = this.measureCtx,
shadowHeight = Math.abs(this.shadowOffset.y),
xOffset = 0,
yOffset;

ctx.font = this.font();
yOffset = colRow.y * (fontHeight(this.fontSize) + shadowHeight);
xOffset = ctx.measureText(this.lines[colRow.y].slice(0, colRow.x)).width;
return new Point(this.left() + xOffset, this.top() + yOffset);
};

TextMorph.prototype.slotAt = function (aPoint) {
// answer the slot (index) closest to the given point taking
// in account how far from the middle of the character it is,
// so the cursor can be moved accordingly
var charX,
row = 0,
col = 0,
columnLength,
shadowHeight = Math.abs(this.shadowOffset.y),
ctx = this.measureCtx,
textWidth;

while (aPoint.y - this.top() >
((fontHeight(this.fontSize) + shadowHeight) * row)) {
row += 1;
}
row = Math.max(row, 1);

ctx.font = this.font();
textWidth = ctx.measureText(this.lines[row - 1]).width;
if (this.alignment === 'right') {
charX = this.width() - textWidth;
} else if (this.alignment === 'center') {
charX = (this.width() - textWidth) / 2;
} else { // 'left'
charX = 0;
}
columnLength = this.lines[row - 1].length;
while (col < columnLength - 1 && aPoint.x - this.left() > charX) {
charX += ctx.measureText(this.lines[row - 1][col]).width;
col += 1;
}

// see where our click fell with respect to the middle of the char
if (aPoint.x - this.left() >
charX - ctx.measureText(this.lines[row - 1][col]).width / 2) {
return this.lineSlots[Math.max(row - 1, 0)] + col;
} else {
return this.lineSlots[Math.max(row - 1, 0)] + col - 1;
}
};

TextMorph.prototype.upFrom = function (slot) {
// answer the slot above the given one
var above,
colRow = this.columnRow(slot);
if (colRow.y < 1) {
return slot;
}
above = this.lines[colRow.y - 1];
if (above.length < colRow.x - 1) {
return this.lineSlots[colRow.y - 1] + above.length;
}
return this.lineSlots[colRow.y - 1] + colRow.x;
};

TextMorph.prototype.downFrom = function (slot) {
// answer the slot below the given one
var below,
colRow = this.columnRow(slot);
if (colRow.y > this.lines.length - 2) {
return slot;
}
below = this.lines[colRow.y + 1];
if (below.length < colRow.x - 1) {
return this.lineSlots[colRow.y + 1] + below.length;
}
return this.lineSlots[colRow.y + 1] + colRow.x;
};

TextMorph.prototype.startOfLine = function (slot) {
// answer the first slot (index) of the line for the given slot
return this.lineSlots[this.columnRow(slot).y];
};

TextMorph.prototype.endOfLine = function (slot) {
// answer the slot (index) indicating the EOL for the given slot
return this.startOfLine(slot) +
this.lines[this.columnRow(slot).y].length - 1;
};

TextMorph.prototype.previousWordFrom = StringMorph.prototype.previousWordFrom;

TextMorph.prototype.nextWordFrom = StringMorph.prototype.nextWordFrom;

// TextMorph editing:

TextMorph.prototype.edit = StringMorph.prototype.edit;

TextMorph.prototype.selection = StringMorph.prototype.selection;

TextMorph.prototype.selectionStartSlot
= StringMorph.prototype.selectionStartSlot;

TextMorph.prototype.clearSelection = StringMorph.prototype.clearSelection;

TextMorph.prototype.deleteSelection = StringMorph.prototype.deleteSelection;

TextMorph.prototype.selectAll = StringMorph.prototype.selectAll;

TextMorph.prototype.mouseDownLeft = StringMorph.prototype.mouseDownLeft;

TextMorph.prototype.shiftClick = StringMorph.prototype.shiftClick;

TextMorph.prototype.mouseClickLeft = StringMorph.prototype.mouseClickLeft;

TextMorph.prototype.mouseDoubleClick = StringMorph.prototype.mouseDoubleClick;

TextMorph.prototype.selectWordAt = StringMorph.prototype.selectWordAt;

TextMorph.prototype.selectBetweenWordsAt
= StringMorph.prototype.selectBetweenWordsAt;

TextMorph.prototype.enableSelecting = StringMorph.prototype.enableSelecting;

TextMorph.prototype.disableSelecting = StringMorph.prototype.disableSelecting;

TextMorph.prototype.selectAllAndEdit = function () {
this.edit();
this.selectAll();
};

// TextMorph menus:

TextMorph.prototype.developersMenu = function () {
var menu = TextMorph.uber.developersMenu.call(this);
menu.addLine();
menu.addItem("edit", 'edit');
menu.addItem(
"font size...",
() => {
this.prompt(
menu.title + '\nfont\nsize:',
this.setFontSize,
this,
this.fontSize.toString(),
null,
6,
100,
true
);
},
'set this Text\'s\nfont point size'
);
if (this.alignment !== 'left') {
menu.addItem("align left", 'setAlignmentToLeft');
}
if (this.alignment !== 'right') {
menu.addItem("align right", 'setAlignmentToRight');
}
if (this.alignment !== 'center') {
menu.addItem("align center", 'setAlignmentToCenter');
}
menu.addLine();
if (this.fontStyle !== 'serif') {
menu.addItem("serif", 'setSerif');
}
if (this.fontStyle !== 'sans-serif') {
menu.addItem("sans-serif", 'setSansSerif');
}
if (this.isBold) {
menu.addItem("normal weight", 'toggleWeight');
} else {
menu.addItem("bold", 'toggleWeight');
}
if (this.isItalic) {
menu.addItem("normal style", 'toggleItalic');
} else {
menu.addItem("italic", 'toggleItalic');
}
return menu;
};

TextMorph.prototype.setAlignmentToLeft = function () {
this.alignment = 'left';
this.rerender();
};

TextMorph.prototype.setAlignmentToRight = function () {
this.alignment = 'right';
this.rerender();
};

TextMorph.prototype.setAlignmentToCenter = function () {
this.alignment = 'center';
this.rerender();
};

TextMorph.prototype.toggleIsDraggable
= StringMorph.prototype.toggleIsDraggable;

TextMorph.prototype.toggleWeight = StringMorph.prototype.toggleWeight;

TextMorph.prototype.toggleItalic = StringMorph.prototype.toggleItalic;

TextMorph.prototype.setSerif = StringMorph.prototype.setSerif;

TextMorph.prototype.setSansSerif = StringMorph.prototype.setSansSerif;

TextMorph.prototype.setText = StringMorph.prototype.setText;

TextMorph.prototype.setFontSize = StringMorph.prototype.setFontSize;

TextMorph.prototype.numericalSetters = StringMorph.prototype.numericalSetters;

// TextMorph evaluation:

TextMorph.prototype.evaluationMenu = function () {
var menu = new MenuMorph(this, null);
menu.addItem(
"do it",
'doIt',
'evaluate the\nselected expression'
);
menu.addItem(
"show it",
'showIt',
'evaluate the\nselected expression\nand show the result'
);
menu.addItem(
"inspect it",
'inspectIt',
'evaluate the\nselected expression\nand inspect the result'
);
menu.addLine();
menu.addItem("select all", 'selectAllAndEdit');
return menu;
};

TextMorph.prototype.setReceiver = function (obj) {
this.receiver = obj;
this.customContextMenu = this.evaluationMenu();
};

TextMorph.prototype.doIt = function () {
this.receiver.evaluateString(this.selection());
this.edit();
};

TextMorph.prototype.showIt = function () {
var result = this.receiver.evaluateString(this.selection());
if (result !== null) {
this.inform(result);
}
};

TextMorph.prototype.inspectIt = function () {
var result = this.receiver.evaluateString(this.selection()),
world = this.world(),
inspector;
if (isObject(result)) {
inspector = new InspectorMorph(result);
inspector.setPosition(world.hand.position());
inspector.keepWithin(world);
world.add(inspector);
inspector.changed();
}
};

// TriggerMorph ////////////////////////////////////////////////////////

// I provide basic button functionality

// TriggerMorph inherits from Morph:

TriggerMorph.prototype = new Morph();
TriggerMorph.prototype.constructor = TriggerMorph;
TriggerMorph.uber = Morph.prototype;

// TriggerMorph instance creation:

function TriggerMorph(
target,
action,
labelString,
fontSize,
fontStyle,
environment,
hint,
labelColor,
labelBold,
labelItalic,
doubleClickAction
) {
this.init(
target,
action,
labelString,
fontSize,
fontStyle,
environment,
hint,
labelColor,
labelBold,
labelItalic,
doubleClickAction
);
}

TriggerMorph.prototype.init = function (
target,
action,
labelString,
fontSize,
fontStyle,
environment,
hint,
labelColor,
labelBold,
labelItalic,
doubleClickAction
) {
// additional properties:
this.target = target || null;
this.action = action === 0 ? 0 : action|| null;
this.doubleClickAction = doubleClickAction || null;
this.environment = environment || null;
this.labelString = labelString || ' ';
this.label = null;
this.hint = hint || null; // null, String, or Function
this.schedule = null; // animation slot for displaying hints
this.fontSize = fontSize || MorphicPreferences.menuFontSize;
this.fontStyle = fontStyle || 'sans-serif';
this.highlightColor = new Color(192, 192, 192);
this.pressColor = new Color(128, 128, 128);
this.labelColor = labelColor || new Color(0, 0, 0);
this.labelBold = labelBold || false;
this.labelItalic = labelItalic || false;
this.userState = 'normal'; // 'highlight', 'pressed'

// initialize inherited properties:
TriggerMorph.uber.init.call(this);

// override inherited properites:
this.color = WHITE;
this.createLabel();
};

// TriggerMorph drawing:

TriggerMorph.prototype.render = function (ctx) {
var colorBak = this.color;
if (this.userState === 'highlight') {
this.color = this.highlightColor;
} else if (this.userState === 'pressed') {
this.color = this.pressColor;
}
TriggerMorph.uber.render.call(this, ctx);
this.color = colorBak;
};

TriggerMorph.prototype.createLabel = function () {
if (this.label !== null) {
this.label.destroy();
}
this.label = new StringMorph(
this.labelString,
this.fontSize,
this.fontStyle,
this.labelBold,
this.labelItalic,
false, // numeric
null, // shadow offset
null, // shadow color
this.labelColor
);
this.fixLayout();
this.add(this.label);
};

TriggerMorph.prototype.fixLayout = function () {
this.label.setPosition(
this.center().subtract(
this.label.extent().floorDivideBy(2)
)
);
};

// TriggerMorph action:

TriggerMorph.prototype.trigger = function () {
/*
if target is a function, use it as callback:
execute target as callback function with action as argument
in the environment as optionally specified.
Note: if action is also a function, instead of becoming
the argument itself it will be called to answer the argument.
for selections, Yes/No Choices etc. As second argument pass
myself, so I can be modified to reflect status changes, e.g.
inside a list box:

else (if target is not a function):

if action is a function:
execute the action with target as environment (can be null)
for lambdafied (inline) actions

else if action is a String:
treat it as function property of target and execute it
for selector-like actions
*/
if (this.schedule) {
this.schedule.isActive = false;
}
if (typeof this.target === 'function') {
if (typeof this.action === 'function') {
this.target.call(this.environment, this.action.call(), this);
} else {
this.target.call(this.environment, this.action, this);
}
} else {
if (typeof this.action === 'function') {
this.action.call(this.target);
} else { // assume it's a String
this.target[this.action]();
}
}
};

TriggerMorph.prototype.triggerDoubleClick = function () {
// same as trigger() but use doubleClickAction instead of action property
// note that specifying a doubleClickAction is optional
if (!this.doubleClickAction) {return; }
if (this.schedule) {
this.schedule.isActive = false;
}
if (typeof this.target === 'function') {
if (typeof this.doubleClickAction === 'function') {
this.target.call(
this.environment,
this.doubleClickAction.call(),
this
);
} else {
this.target.call(this.environment, this.doubleClickAction, this);
}
} else {
if (typeof this.doubleClickAction === 'function') {
this.doubleClickAction.call(this.target);
} else { // assume it's a String
this.target[this.doubleClickAction]();
}
}
};

// TriggerMorph events:

TriggerMorph.prototype.mouseEnter = function () {
var contents = this.hint instanceof Function ? this.hint() : this.hint;
this.userState = 'highlight';
this.rerender();
if (contents) {
this.bubbleHelp(contents);
}
};

TriggerMorph.prototype.mouseLeave = function () {
this.userState = 'normal';
this.rerender();
if (this.schedule) {
this.schedule.isActive = false;
}
if (this.hint) {
this.world().hand.destroyTemporaries();
}
};

TriggerMorph.prototype.mouseDownLeft = function () {
this.userState = 'pressed';
this.rerender();
};

TriggerMorph.prototype.mouseClickLeft = function () {
this.userState = 'highlight';
this.rerender();
this.trigger();
};

TriggerMorph.prototype.mouseDoubleClick = function () {
this.triggerDoubleClick();
};

TriggerMorph.prototype.rootForGrab = function () {
return this.isDraggable ? TriggerMorph.uber.rootForGrab.call(this) : null;
};

// TriggerMorph bubble help:

TriggerMorph.prototype.bubbleHelp = function (contents) {
var world = this.world();
this.schedule = new Animation(
nop,
nop,
0,
500,
nop,
() => this.popUpbubbleHelp(contents)
);
world.animations.push(this.schedule);
};

TriggerMorph.prototype.popUpbubbleHelp = function (contents) {
new SpeechBubbleMorph(
localize(contents),
null,
null,
1
).popUp(this.world(), this.rightCenter().add(new Point(-8, 0)));
};

// MenuItemMorph ///////////////////////////////////////////////////////

// I automatically determine my bounds

var MenuItemMorph;

// MenuItemMorph inherits from TriggerMorph:

MenuItemMorph.prototype = new TriggerMorph();
MenuItemMorph.prototype.constructor = MenuItemMorph;
MenuItemMorph.uber = TriggerMorph.prototype;

// MenuItemMorph instance creation:

function MenuItemMorph(
target,
action,
labelString, // can also be a Morph or a Canvas or a tuple: [icon, string]
fontSize,
fontStyle,
environment,
hint,
color,
bold,
italic,
doubleClickAction, // optional when used as list morph item
shortcut // optional string, Morph, Canvas or tuple: [icon, string]
) {
// additional properties:
this.shortcutString = shortcut || null;
this.shortcut = null;

// initialize inherited properties:
this.init(
target,
action,
labelString,
fontSize,
fontStyle,
environment,
hint,
color,
bold,
italic,
doubleClickAction
);
}

MenuItemMorph.prototype.createLabel = function () {
var w, h;
if (this.label) {
this.label.destroy();
}
this.label = this.createLabelPart(this.labelString);
this.add(this.label);
w = this.label.width();
h = this.label.height();
if (this.shortcut) {
this.shortcut.destroy();
}
if (this.shortcutString) {
this.shortcut = this.createLabelPart(this.shortcutString);
w += this.shortcut.width() + 4;
h = Math.max(h, this.shortcut.height());
this.add(this.shortcut);
}
this.setExtent(new Point(w + 8, h));
};

MenuItemMorph.prototype.fixLayout = function () {
var cntr = this.center();
this.label.setCenter(cntr);
this.label.setLeft(this.left() + 4);
if (this.shortcut) {
this.shortcut.setCenter(cntr);
this.shortcut.setRight(this.right() - 4);
}
};

MenuItemMorph.prototype.createLabelPart = function (source) {
var part, icon, lbl;
if (isString(source)) {
return this.createLabelString(source);
}
if (source instanceof Array) {
// assume its pattern is: [icon, string]
part = new Morph();
part.alpha = 0; // transparent
icon = this.createIcon(source[0]);
part.add(icon);
lbl = this.createLabelString(source[1]);
part.add(lbl);
lbl.setCenter(icon.center());
lbl.setLeft(icon.right() + 4);
part.bounds = (icon.bounds.merge(lbl.bounds));
part.rerender();
return part;
}
// assume it's either a Morph or a Canvas
return this.createIcon(source);
};

MenuItemMorph.prototype.createIcon = function (source) {
// source can be either a Morph or an HTMLCanvasElement
var icon;

if (source instanceof Morph) {
return source.fullCopy();
}
// assume a Canvas
icon = new Morph();
icon.isCachingImage = true;
icon.cachedImage = source; // should we copy the canvas?
icon.bounds.setWidth(source.width);
icon.bounds.setHeight(source.height);
return icon;
};

MenuItemMorph.prototype.createLabelString = function (string) {
var lbl = new TextMorph(
string,
this.fontSize,
this.fontStyle,
this.labelBold,
this.labelItalic
);
lbl.setColor(this.labelColor);
return lbl;
};

// MenuItemMorph events:

MenuItemMorph.prototype.mouseEnter = function () {
var menu = this.parentThatIsA(MenuMorph);
if (this.isShowingSubmenu()) {
return;
}
if (menu) {
menu.closeSubmenu();
}
if (!this.isListItem()) {
this.userState = 'highlight';
this.rerender();
}
if (this.action instanceof MenuMorph) {
this.delaySubmenu();
} else if (this.hint) {
this.bubbleHelp(this.hint);
}
};

MenuItemMorph.prototype.mouseLeave = function () {
if (!this.isListItem()) {
if (this.isShowingSubmenu()) {
this.userState = 'highlight';
} else {
this.userState = 'normal';
}
this.rerender();
}
if (this.schedule) {
this.schedule.isActive = false;
}
if (this.hint) {
this.world().hand.destroyTemporaries();
}
};

MenuItemMorph.prototype.mouseDownLeft = function (pos) {
if (this.isListItem()) {
this.parentThatIsA(MenuMorph).unselectAllItems();
this.escalateEvent('mouseDownLeft', pos);
}
this.userState = 'pressed';
this.rerender();
};

MenuItemMorph.prototype.mouseMove = function () {
if (this.isListItem()) {
this.escalateEvent('mouseMove');
}
};

MenuItemMorph.prototype.mouseClickLeft = function () {
if (this.action instanceof MenuMorph) {
this.popUpSubmenu();
} else {
if (!this.isListItem()) {
this.parentThatIsA(MenuMorph).closeRootMenu();
this.world().activeMenu = null;
}
this.trigger();
}
};

MenuItemMorph.prototype.isListItem = function () {
var menu = this.parentThatIsA(MenuMorph);
if (menu) {
return menu.isListContents;
}
return false;
};

MenuItemMorph.prototype.isSelectedListItem = function () {
if (this.isListItem()) {
return this.userState === 'pressed';
}
return false;
};

MenuItemMorph.prototype.isShowingSubmenu = function () {
var menu = this.parentThatIsA(MenuMorph);
if (menu && (this.action instanceof MenuMorph)) {
return menu.submenu === this.action;
}
return false;
};

// MenuItemMorph submenus:

MenuItemMorph.prototype.delaySubmenu = function () {
var world = this.world();
this.schedule = new Animation(
nop,
nop,
0,
500,
nop,
() => this.popUpSubmenu()
);
world.animations.push(this.schedule);
};

MenuItemMorph.prototype.popUpSubmenu = function () {
var menu = this.parentThatIsA(MenuMorph),
world = this.world(),
scroller;

if (!(this.action instanceof MenuMorph)) {return; }
this.action.createItems();
this.action.setPosition(this.topRight().subtract(new Point(0, 5)));
this.action.addShadow(new Point(2, 2), 80);
this.action.keepWithin(this.world());
if (this.action.items.length < 1 && !this.action.title) {return; }

if (this.action.bottom() > world.bottom()) {
// scroll menu items if the menu is taller than the world
this.action.removeShadow();
scroller = this.action.scroll();
this.action.bounds.corner.y = world.bottom() - 2;
this.action.addShadow(new Point(2, 2), 80);
scroller.setHeight(world.bottom() - scroller.top() - 6);
scroller.adjustScrollBars(); // ?
}

menu.add(this.action);
menu.submenu = this.action;
menu.submenu.world = menu.world; // keyboard control
this.action.fullChanged();
};

// FrameMorph //////////////////////////////////////////////////////////

// I clip my submorphs at my bounds

// Frames inherit from Morph:

FrameMorph.prototype = new Morph();
FrameMorph.prototype.constructor = FrameMorph;
FrameMorph.uber = Morph.prototype;

function FrameMorph(aScrollFrame) {
this.init(aScrollFrame);
}

FrameMorph.prototype.init = function (aScrollFrame) {
this.scrollFrame = aScrollFrame || null;

FrameMorph.uber.init.call(this);
this.color = new Color(255, 250, 245);
this.acceptsDrops = true;

if (this.scrollFrame) {
this.isDraggable = false;
this.alpha = 0;
}
};

FrameMorph.prototype.fullBounds = function () {
var shadow = this.getShadow();
if (shadow !== null) {
return this.bounds.merge(shadow.bounds);
}
return this.bounds;
};

FrameMorph.prototype.fullImage = function () {
// use only for shadows
return this.getImage();
};

FrameMorph.prototype.fullDrawOn = function (ctx, aRect) {
var shadow, clipped;
if (!this.isVisible) {return; }
clipped = this.bounds.intersect(aRect);
if (!clipped.extent().gt(ZERO)) {return; }
this.drawOn(ctx, clipped);
this.children.forEach(child => {
if (child instanceof ShadowMorph) {
shadow = child;
} else {
child.fullDrawOn(ctx, clipped);
}
});
if (shadow) {
shadow.drawOn(ctx, aRect);
}
};

// FrameMorph navigation:

FrameMorph.prototype.topMorphAt = function (point) {
var i, result;
if (!(this.isVisible && this.bounds.containsPoint(point))) {
return null;
}
for (i = this.children.length - 1; i >= 0; i -= 1) {
result = this.children[i].topMorphAt(point);
if (result) {return result; }
}
if (this.isFreeForm) {
return this.isTransparentAt(point) ? null : this;
}
return this;
};

// FrameMorph scrolling support:

FrameMorph.prototype.submorphBounds = function () {
var result = null;

if (this.children.length > 0) {
result = this.children[0].bounds;
this.children.forEach(child => {
result = result.merge(child.fullBounds());
});
}
return result;
};

FrameMorph.prototype.keepInScrollFrame = function () {
if (this.scrollFrame === null) {
return null;
}
if (this.left() > this.scrollFrame.left()) {
this.moveBy(
new Point(this.scrollFrame.left() - this.left(), 0)
);
}
if (this.right() < this.scrollFrame.right()) {
this.moveBy(
new Point(this.scrollFrame.right() - this.right(), 0)
);
}
if (this.top() > this.scrollFrame.top()) {
this.moveBy(
new Point(0, this.scrollFrame.top() - this.top())
);
}
if (this.bottom() < this.scrollFrame.bottom()) {
this.moveBy(
0,
new Point(this.scrollFrame.bottom() - this.bottom(), 0)
);
}
};

FrameMorph.prototype.adjustBounds = function () {
var subBounds,
newBounds;

if (this.scrollFrame === null) {return; }
subBounds = this.submorphBounds();
if (subBounds && (!this.scrollFrame.isTextLineWrapping)) {
newBounds = subBounds
.expandBy(this.scrollFrame.padding)
.growBy(this.scrollFrame.growth)
.merge(this.scrollFrame.bounds);
} else {
newBounds = this.scrollFrame.bounds.copy();
}
if (!this.bounds.eq(newBounds)) {
this.bounds = newBounds;
this.keepInScrollFrame();
}
if (this.scrollFrame.isTextLineWrapping) {
this.children.forEach(morph => {
if (morph instanceof TextMorph) {
morph.setWidth(this.width());
this.setHeight(
Math.max(morph.height(), this.scrollFrame.height())
);
}
});
}
this.scrollFrame.adjustScrollBars();
};

// FrameMorph dragging & dropping of contents:

FrameMorph.prototype.reactToDropOf = function () {
this.adjustBounds();
};

FrameMorph.prototype.reactToGrabOf = function () {
this.adjustBounds();
};

// FrameMorph menus:

FrameMorph.prototype.developersMenu = function () {
var menu = FrameMorph.uber.developersMenu.call(this);
if (this.children.length > 0) {
menu.addLine();
menu.addItem(
"move all inside...",
'keepAllSubmorphsWithin',
'keep all submorphs\nwithin and visible'
);
}
return menu;
};

FrameMorph.prototype.keepAllSubmorphsWithin = function () {
this.children.forEach(m => m.keepWithin(this));
};

// ScrollFrameMorph ////////////////////////////////////////////////////

ScrollFrameMorph.prototype = new FrameMorph();
ScrollFrameMorph.prototype.constructor = ScrollFrameMorph;
ScrollFrameMorph.uber = FrameMorph.prototype;

function ScrollFrameMorph(scroller, size, sliderColor) {
this.init(scroller, size, sliderColor);
}

ScrollFrameMorph.prototype.init = function (scroller, size, sliderColor) {
ScrollFrameMorph.uber.init.call(this);
this.scrollBarSize = size || MorphicPreferences.scrollBarSize;
this.autoScrollTrigger = null;
this.enableAutoScrolling = true; // change to suppress
this.isScrollingByDragging = true; // change to suppress
this.hasVelocity = true; // dto.
this.padding = 0; // around the scrollable area
this.growth = 0; // pixels or Point to grow right/left when near edge
this.isTextLineWrapping = false;
this.contents = scroller || new FrameMorph(this);
this.add(this.contents);
this.hBar = new SliderMorph(
null, // start
null, // stop
null, // value
null, // size
'horizontal',
sliderColor
);
this.hBar.setHeight(this.scrollBarSize);
this.hBar.action = (num) => {
this.contents.setPosition(
new Point(
this.left() - num,
this.contents.position().y
)
);
};
this.hBar.isDraggable = false;
this.add(this.hBar);
this.vBar = new SliderMorph(
null, // start
null, // stop
null, // value
null, // size
'vertical',
sliderColor
);
this.vBar.setWidth(this.scrollBarSize);
this.vBar.action = (num) => {
this.contents.setPosition(
new Point(
this.contents.position().x,
this.top() - num
)
);
};
this.vBar.isDraggable = false;
this.add(this.vBar);
this.toolBar = null; // optional slot
};

ScrollFrameMorph.prototype.adjustScrollBars = function () {
var hWidth = this.width() - this.scrollBarSize,
vHeight = this.height() - this.scrollBarSize;

this.changed();
if (this.contents.width() > this.width()) {
this.hBar.show();
if (this.hBar.width() !== hWidth) {
this.hBar.setWidth(hWidth);
}

this.hBar.setPosition(
new Point(
this.left(),
this.bottom() - this.hBar.height()
)
);
this.hBar.start = 0;
this.hBar.stop = this.contents.width() -
this.width() +
this.scrollBarSize;
this.hBar.size =
this.width() / this.contents.width() * this.hBar.stop;
this.hBar.value = this.left() - this.contents.left();
this.hBar.fixLayout();
} else {
this.hBar.hide();
}

if (this.contents.height() > this.height()) {
this.vBar.show();
if (this.vBar.height() !== vHeight) {
this.vBar.setHeight(vHeight);
}

this.vBar.setPosition(
new Point(
this.right() - this.vBar.width(),
this.top()
)
);
this.vBar.start = 0;
this.vBar.stop = this.contents.height() -
this.height() +
this.scrollBarSize;
this.vBar.size =
this.height() / this.contents.height() * this.vBar.stop;
this.vBar.value = this.top() - this.contents.top();
this.vBar.fixLayout();
} else {
this.vBar.hide();
}
this.adjustToolBar();
};

ScrollFrameMorph.prototype.adjustToolBar = function () {
var padding = 3;
if (this.toolBar) {
this.toolBar.setTop(this.top() + padding);
this.toolBar.setRight(
(this.vBar.isVisible ? this.vBar.left() : this.right()) - padding
);
}
};

ScrollFrameMorph.prototype.addContents = function (aMorph) {
this.contents.add(aMorph);
this.contents.adjustBounds();
};

ScrollFrameMorph.prototype.setContents = function (aMorph) {
this.contents.children.forEach(m => m.destroy());
this.contents.children = [];
aMorph.setPosition(this.position().add(this.padding + 2));
this.addContents(aMorph);
};

ScrollFrameMorph.prototype.setExtent = function (aPoint) {
if (this.isTextLineWrapping) {
this.contents.setPosition(this.position().copy());
}
ScrollFrameMorph.uber.setExtent.call(this, aPoint);
this.contents.adjustBounds();
};

// ScrollFrameMorph scrolling by dragging:

ScrollFrameMorph.prototype.scrollX = function (steps) {
var cl = this.contents.left(),
l = this.left(),
cw = this.contents.width(),
r = this.right(),
newX;

if (this.vBar.isVisible) {
r -= this.scrollBarSize;
}

newX = cl + steps;
if (newX + cw < r) {
newX = r - cw;
}
if (newX > l) {
newX = l;
}
if (newX !== cl) {
this.contents.setLeft(newX);
}
};

ScrollFrameMorph.prototype.scrollY = function (steps) {
var ct = this.contents.top(),
t = this.top(),
ch = this.contents.height(),
b = this.bottom(),
newY;

if (this.hBar.isVisible) {
b -= this.scrollBarSize;
}

newY = ct + steps;
if (newY + ch < b) {
newY = b - ch;
}
if (newY > t) {
newY = t;
}
if (newY !== ct) {
this.contents.setTop(newY);
}
};

ScrollFrameMorph.prototype.step = nop;

ScrollFrameMorph.prototype.mouseDownLeft = function (pos) {
if (!this.isScrollingByDragging) {
return null;
}
var world = this.root(),
hand = world.hand,
oldPos = pos,
deltaX = 0,
deltaY = 0,
friction = 0.8;

this.step = () => {
var newPos;
if (hand.mouseButton &&
(hand.children.length === 0) &&
(this.bounds.containsPoint(hand.bounds.origin))) {

if (hand.grabPosition &&
(hand.grabPosition.distanceTo(hand.position()) <=
MorphicPreferences.grabThreshold)) {
// still within the grab threshold
return null;
}

newPos = hand.bounds.origin;
deltaX = newPos.x - oldPos.x;
if (deltaX !== 0) {
this.scrollX(deltaX);
}
deltaY = newPos.y - oldPos.y;
if (deltaY !== 0) {
this.scrollY(deltaY);
}
oldPos = newPos;
} else {
if (!this.hasVelocity) {
this.step = nop;
} else {
if ((Math.abs(deltaX) < 0.5) &&
(Math.abs(deltaY) < 0.5)) {
this.step = nop;
} else {
deltaX = deltaX * friction;
this.scrollX(Math.round(deltaX));
deltaY = deltaY * friction;
this.scrollY(Math.round(deltaY));
}
}
}
this.adjustScrollBars();
};
};

ScrollFrameMorph.prototype.startAutoScrolling = function () {
var inset = MorphicPreferences.scrollBarSize * 3,
world = this.world(),
hand,
inner,
pos;

if (!world) {
return null;
}
hand = world.hand;
if (!this.autoScrollTrigger) {
this.autoScrollTrigger = Date.now();
}
this.step = () => {
pos = hand.bounds.origin;
inner = this.bounds.insetBy(inset);
if ((this.bounds.containsPoint(pos)) &&
(!(inner.containsPoint(pos))) &&
(hand.children.length > 0)) {
this.autoScroll(pos);
} else {
this.step = nop;
this.autoScrollTrigger = null;
}
};
};

ScrollFrameMorph.prototype.autoScroll = function (pos) {
var inset, area;

if (Date.now() - this.autoScrollTrigger < 500) {
return null;
}

inset = MorphicPreferences.scrollBarSize * 3;
area = this.topLeft().extent(new Point(this.width(), inset));
if (area.containsPoint(pos)) {
this.scrollY(inset - (pos.y - this.top()));
}
area = this.topLeft().extent(new Point(inset, this.height()));
if (area.containsPoint(pos)) {
this.scrollX(inset - (pos.x - this.left()));
}
area = (new Point(this.right() - inset, this.top()))
.extent(new Point(inset, this.height()));
if (area.containsPoint(pos)) {
this.scrollX(-(inset - (this.right() - pos.x)));
}
area = (new Point(this.left(), this.bottom() - inset))
.extent(new Point(this.width(), inset));
if (area.containsPoint(pos)) {
this.scrollY(-(inset - (this.bottom() - pos.y)));
}
this.adjustScrollBars();
};

// ScrollFrameMorph scrolling by editing text:

ScrollFrameMorph.prototype.scrollCursorIntoView = function (morph) {
var txt = morph.target,
offset = txt.position().subtract(this.contents.position()),
ft = this.top() + this.padding,
fb = this.bottom() - this.padding;
this.contents.setExtent(txt.extent().add(offset).add(this.padding));
if (morph.top() < ft) {
this.contents.setTop(this.contents.top() + ft - morph.top());
morph.setTop(ft);
} else if (morph.bottom() > fb) {
this.contents.setBottom(this.contents.bottom() + fb - morph.bottom());
morph.setBottom(fb);
}
this.adjustScrollBars();
};

// ScrollFrameMorph events:

ScrollFrameMorph.prototype.mouseScroll = function (y, x) {
if (y) {
this.scrollY(y * MorphicPreferences.mouseScrollAmount);
}
if (x) {
this.scrollX(x * MorphicPreferences.mouseScrollAmount);
}
this.adjustScrollBars();
};

// ScrollFrameMorph duplicating:

ScrollFrameMorph.prototype.updateReferences = function (map) {
ScrollFrameMorph.uber.updateReferences.call(this, map);
if (this.hBar) {
this.hBar.action = (num) => {
this.contents.setPosition(
new Point(this.left() - num, this.contents.position().y)
);
};
}
if (this.vBar) {
this.vBar.action = (num) => {
this.contents.setPosition(
new Point(this.contents.position().x, this.top() - num)
);
};
}
};

// ScrollFrameMorph menu:

ScrollFrameMorph.prototype.developersMenu = function () {
var menu = ScrollFrameMorph.uber.developersMenu.call(this);
if (this.isTextLineWrapping) {
menu.addItem(
"auto line wrap off...",
'toggleTextLineWrapping',
'turn automatic\nline wrapping\noff'
);
} else {
menu.addItem(
"auto line wrap on...",
'toggleTextLineWrapping',
'enable automatic\nline wrapping'
);
}
return menu;
};

ScrollFrameMorph.prototype.toggleTextLineWrapping = function () {
this.isTextLineWrapping = !this.isTextLineWrapping;
};

// ListMorph ///////////////////////////////////////////////////////////

ListMorph.prototype = new ScrollFrameMorph();
ListMorph.prototype.constructor = ListMorph;
ListMorph.uber = ScrollFrameMorph.prototype;

function ListMorph(elements, labelGetter, format, onDoubleClick, separator) {
/*
passing a format is optional. If the format parameter is specified
it has to be of the following pattern:

[
[<color>, <single-argument predicate>],
['bold', <single-argument predicate>],
['italic', <single-argument predicate>],
...
]

multiple conditions can be passed in such a format list, the
last predicate to evaluate true when given the list element sets
the given format category (color, bold, italic).
If no condition is met, the default format (color black, non-bold,
non-italic) will be assigned.

An example of how to use fomats can be found in the InspectorMorph's
"markOwnProperties" mechanism.
*/
this.init(
elements || [],
labelGetter || function (element) {
if (isString(element)) {
return element;
}
if (element.toSource) {
return element.toSource();
}
return element.toString();
},
format || [],
onDoubleClick, // optional callback
separator // string indicating a horizontal line between items
);
}

ListMorph.prototype.init = function (
elements,
labelGetter,
format,
onDoubleClick,
separator
) {
ListMorph.uber.init.call(this);

this.contents.acceptsDrops = false;
this.color = WHITE;
this.hBar.alpha = 0.6;
this.vBar.alpha = 0.6;
this.elements = elements || [];
this.labelGetter = labelGetter;
this.format = format;
this.listContents = null;
this.selected = null; // actual element currently selected
this.active = null; // menu item representing the selected element
this.action = null;
this.doubleClickAction = onDoubleClick || null;
this.separator = separator || '';
this.acceptsDrops = false;
this.buildListContents();
};

ListMorph.prototype.buildListContents = function () {
if (this.listContents) {
this.listContents.destroy();
}
this.listContents = new MenuMorph(
this.select,
null,
this
);
if (this.elements.length === 0) {
this.elements = ['(empty)'];
}
this.elements.forEach(element => {
var color = null,
bold = false,
italic = false,
label;

this.format.forEach(pair => {
if (pair[1].call(null, element)) {
if (pair[0] === 'bold') {
bold = true;
} else if (pair[0] === 'italic') {
italic = true;
} else { // assume it's a color
color = pair[0];
}
}
});

label = this.labelGetter(element);
if (label === this.separator) {
this.listContents.addLine();
} else {
this.listContents.addItem(
label, // label string
element, // action
null, // hint
color,
bold,
italic,
this.doubleClickAction,
null, // shortcut
true // verbatim - don't translate
);
}
});
this.listContents.isListContents = true;
this.listContents.createItems();
this.listContents.setPosition(this.contents.position());
this.addContents(this.listContents);
};

ListMorph.prototype.select = function (item, trigger) {
if (isNil(item)) {return; }
this.selected = item;
this.active = trigger;
if (this.action) {
this.action.call(null, item);
}
};

ListMorph.prototype.setExtent = function (aPoint) {
var lb = this.listContents.bounds,
nb = this.bounds.origin.copy().corner(
this.bounds.origin.add(aPoint)
);

if (nb.right() > lb.right() && nb.width() <= lb.width()) {
this.listContents.setRight(nb.right());
}
if (nb.bottom() > lb.bottom() && nb.height() <= lb.height()) {
this.listContents.setBottom(nb.bottom());
}
ListMorph.uber.setExtent.call(this, aPoint);
};

ListMorph.prototype.activeIndex = function () {
return this.listContents.children.indexOf(this.active);
};

ListMorph.prototype.activateIndex = function (idx) {
var item = this.listContents.children[idx];
if (!item) {return; }
item.userState = 'pressed';
item.rerender();
item.trigger();
};

// StringFieldMorph ////////////////////////////////////////////////////

// StringFieldMorph inherit from FrameMorph:

StringFieldMorph.prototype = new FrameMorph();
StringFieldMorph.prototype.constructor = StringFieldMorph;
StringFieldMorph.uber = FrameMorph.prototype;

function StringFieldMorph(
defaultContents,
minWidth,
fontSize,
fontStyle,
bold,
italic,
isNumeric
) {
this.init(
defaultContents || '',
minWidth || 100,
fontSize || 12,
fontStyle || 'sans-serif',
bold || false,
italic || false,
isNumeric
);
}

StringFieldMorph.prototype.init = function (
defaultContents,
minWidth,
fontSize,
fontStyle,
bold,
italic,
isNumeric
) {
this.defaultContents = defaultContents;
this.minWidth = minWidth;
this.fontSize = fontSize;
this.fontStyle = fontStyle;
this.isBold = bold;
this.isItalic = italic;
this.isNumeric = isNumeric || false;
this.text = null;
StringFieldMorph.uber.init.call(this);
this.color = WHITE;
this.isEditable = true;
this.acceptsDrops = false;
this.createText();
};

StringFieldMorph.prototype.createText = function () {
var txt;
txt = this.text ? this.string() : this.defaultContents;
this.text = null;
this.children.forEach(child => child.destroy());
this.children = [];
this.text = new StringMorph(
txt,
this.fontSize,
this.fontStyle,
this.isBold,
this.isItalic,
this.isNumeric
);

this.text.isNumeric = this.isNumeric; // for whichever reason...
this.text.setPosition(this.bounds.origin.copy());
this.text.isEditable = this.isEditable;
this.text.isDraggable = false;
this.text.enableSelecting();
this.setExtent(
new Point(
Math.max(this.width(), this.minWidth),
this.text.height()
)
);
this.add(this.text);
};

StringFieldMorph.prototype.string = function () {
return this.text.text;
};

StringFieldMorph.prototype.mouseClickLeft = function (pos) {
if (this.isEditable) {
this.text.edit();
} else {
this.escalateEvent('mouseClickLeft', pos);
}
};

// BouncerMorph ////////////////////////////////////////////////////////

// I am a Demo of a stepping custom Morph

var BouncerMorph;

// Bouncers inherit from Morph:

BouncerMorph.prototype = new Morph();
BouncerMorph.prototype.constructor = BouncerMorph;
BouncerMorph.uber = Morph.prototype;

// BouncerMorph instance creation:

function BouncerMorph() {
this.init();
}

// BouncerMorph initialization:

BouncerMorph.prototype.init = function (type, speed) {
BouncerMorph.uber.init.call(this);
this.fps = 50;

// additional properties:
this.isStopped = false;
this.type = type || 'vertical';
if (this.type === 'vertical') {
this.direction = 'down';
} else {
this.direction = 'right';
}
this.speed = speed || 1;
};

// BouncerMorph moving:

BouncerMorph.prototype.moveUp = function () {
this.moveBy(new Point(0, -this.speed));
};

BouncerMorph.prototype.moveDown = function () {
this.moveBy(new Point(0, this.speed));
};

BouncerMorph.prototype.moveRight = function () {
this.moveBy(new Point(this.speed, 0));
};

BouncerMorph.prototype.moveLeft = function () {
this.moveBy(new Point(-this.speed, 0));
};

// BouncerMorph stepping:

BouncerMorph.prototype.step = function () {
if (!this.isStopped) {
if (this.type === 'vertical') {
if (this.direction === 'down') {
this.moveDown();
} else {
this.moveUp();
}
if (this.fullBounds().top() < this.parent.top() &&
this.direction === 'up') {
this.direction = 'down';
}
if (this.fullBounds().bottom() > this.parent.bottom() &&
this.direction === 'down') {
this.direction = 'up';
}
} else if (this.type === 'horizontal') {
if (this.direction === 'right') {
this.moveRight();
} else {
this.moveLeft();
}
if (this.fullBounds().left() < this.parent.left() &&
this.direction === 'left') {
this.direction = 'right';
}
if (this.fullBounds().right() > this.parent.right() &&
this.direction === 'right') {
this.direction = 'left';
}
}
}
};

// HandMorph ///////////////////////////////////////////////////////////

// I represent the Mouse cursor

// HandMorph inherits from Morph:

HandMorph.prototype = new Morph();
HandMorph.prototype.constructor = HandMorph;
HandMorph.uber = Morph.prototype;

// HandMorph instance creation:

function HandMorph(aWorld) {
this.init(aWorld);
}

// HandMorph initialization:

HandMorph.prototype.init = function (aWorld) {
HandMorph.uber.init.call(this, true);
this.bounds = new Rectangle();

// additional properties:
this.world = aWorld;
this.mouseButton = null;
this.mouseOverList = [];
this.mouseOverBounds = [];
this.morphToGrab = null;
this.grabPosition = null;
this.grabOrigin = null;
this.temporaries = [];
this.touchHoldTimeout = null;
this.contextMenuEnabled = false;

// properties for caching dragged objects:
this.cachedFullImage = null;
this.cachedFullBounds = null;
};

// HandMorph dragging optimizations:

HandMorph.prototype.changed = function () {
var b;
if (this.world !== null) {
b = this.cachedFullBounds || this.fullBounds();
if (!b.extent().eq(ZERO)) {
this.world.broken.push(b.spread());
}
}
};

HandMorph.prototype.moveBy = function (delta) {
var children = this.children,
i = children.length;
this.changed();
this.bounds = this.bounds.translateBy(delta);
if (this.cachedFullBounds) {
this.cachedFullBounds = this.cachedFullBounds.translateBy(delta);
}
this.changed();
for (i; i > 0; i -= 1) {
children[i - 1].moveBy(delta);
}
};

HandMorph.prototype.fullChanged = HandMorph.prototype.changed;

// HandMorph display:

HandMorph.prototype.fullDrawOn = function (ctx, rect) {
if (!this.cachedFullBounds) {
HandMorph.uber.fullDrawOn.call(this, ctx, rect);
return;
}

var clipped = rect.intersect(this.cachedFullBounds),
pos = this.cachedFullBounds.origin,
pic, src, w, h, sl, st;

if (!clipped.extent().gt(ZERO)) {return; }
ctx.save();
ctx.globalAlpha = this.alpha;
pic = this.cachedFullImage;
src = clipped.translateBy(pos.neg());
sl = src.left();
st = src.top();
w = Math.min(src.width(), pic.width - sl);
h = Math.min(src.height(), pic.height - st);
if (w < 1 || h < 1) {return; }
ctx.drawImage(
pic,
sl,
st,
w,
h,
clipped.left(),
clipped.top(),
w,
h
);
ctx.restore();
};

// HandMorph navigation:

HandMorph.prototype.morphAtPointer = function () {
return this.world.topMorphAt(this.bounds.origin) || this.world;
};

HandMorph.prototype.allMorphsAtPointer = function () {
return this.world.allChildren().filter(m => m.isVisible &&
m.visibleBounds().containsPoint(this.bounds.origin) &&
!m.holes.some(any =>
any.translateBy(m.position()).containsPoint(this.bounds.origin))
);
};

// HandMorph dragging and dropping:
/*
drag 'n' drop events, method(arg) -> receiver:

prepareToBeGrabbed(handMorph) -> grabTarget
reactToGrabOf(grabbedMorph) -> oldParent
wantsDropOf(morphToDrop) -> newParent
justDropped(handMorph) -> droppedMorph
reactToDropOf(droppedMorph, handMorph) -> newParent
*/

HandMorph.prototype.dropTargetFor = function (aMorph) {
var target = this.morphAtPointer();
while (!target.wantsDropOf(aMorph)) {
target = target.parent;
}
return target;
};

HandMorph.prototype.grab = function (aMorph) {
var oldParent = aMorph.parent;
if (aMorph instanceof WorldMorph) {
return null;
}
if (this.children.length === 0) {
this.world.stopEditing();
this.grabOrigin = aMorph.situation();
if (aMorph.prepareToBeGrabbed) {
aMorph.prepareToBeGrabbed(this);
}
if (!aMorph.noDropShadow) {
aMorph.addShadow();
}
this.add(aMorph);

// cache the dragged object's display resources
this.cachedFullImage = aMorph.fullImage();
this.cachedFullBounds = aMorph.fullBounds();

this.changed();
if (oldParent && oldParent.reactToGrabOf) {
oldParent.reactToGrabOf(aMorph);
}
}
};

HandMorph.prototype.drop = function () {
var target, morphToDrop;
this.alpha = 1;
if (this.children.length !== 0) {
morphToDrop = this.children[0];
target = this.dropTargetFor(morphToDrop);
target = target.selectForEdit ? target.selectForEdit() : target;
this.changed();
target.add(morphToDrop);
morphToDrop.changed();

// invalidate dragging-cache
this.cachedFullImage = null;
this.cachedFullBounds = null;

if (!morphToDrop.noDropShadow) {
morphToDrop.removeShadow();
}
this.children = [];
this.setExtent(new Point());
if (morphToDrop.justDropped) {
morphToDrop.justDropped(this);
}
if (target.reactToDropOf) {
target.reactToDropOf(morphToDrop, this);
}
}
};

// HandMorph event dispatching:
/*
mouse events:

mouseDownLeft
mouseDownRight
mouseClickLeft
mouseClickRight
mouseDoubleClick
mouseEnter
mouseLeave
mouseEnterDragging
mouseLeaveDragging
mouseEnterBounds
mouseLeaveBounds
mouseMove
mouseScroll
*/

HandMorph.prototype.processMouseDown = function (event) {
var morph, actualClick,
posInDocument = getDocumentPositionOf(this.world.worldCanvas);

// update my position, in case I've just been initialized
if (event.pageX) {
this.setPosition(new Point(
event.pageX - posInDocument.x,
event.pageY - posInDocument.y
));
}

// process the actual event
this.destroyTemporaries();
this.contextMenuEnabled = true;
this.morphToGrab = null;
this.grabPosition = null;
if (this.children.length !== 0) {
this.drop();
this.mouseButton = null;
} else {
morph = this.morphAtPointer();
if (this.world.activeMenu) {
if (!contains(
morph.allParents(),
this.world.activeMenu
)) {
this.world.activeMenu.destroy();
} else {
clearInterval(this.touchHoldTimeout);
}
}
if (this.world.activeHandle) {
if (morph !== this.world.activeHandle) {
this.world.activeHandle.destroy();
}
}
if (this.world.cursor) {
if (morph !== this.world.cursor.target) {
this.world.stopEditing();
}
}
if (!morph.mouseMove) {
this.morphToGrab = morph.rootForGrab();
this.grabPosition = this.bounds.origin.copy();
}
if (event.button === 2 || event.ctrlKey) {
this.mouseButton = 'right';
actualClick = 'mouseDownRight';
} else {
this.mouseButton = 'left';
actualClick = 'mouseDownLeft';
}
while (!morph[actualClick]) {
morph = morph.parent;
}
morph[actualClick](this.bounds.origin);
}
};

HandMorph.prototype.processTouchStart = function (event) {
MorphicPreferences.isTouchDevice = true;
clearInterval(this.touchHoldTimeout);
if (event.touches.length === 1) {
this.touchHoldTimeout = setInterval( // simulate mouseRightClick
() => {
this.processMouseDown({button: 2});
this.processMouseUp({button: 2});
event.preventDefault();
clearInterval(this.touchHoldTimeout);
},
400
);
this.processMouseMove(event.touches[0]); // update my position
this.processMouseDown({button: 0});
event.preventDefault();
}
};

HandMorph.prototype.processTouchMove = function (event) {
MorphicPreferences.isTouchDevice = true;
if (event.touches.length === 1) {
var touch = event.touches[0];
this.processMouseMove(touch);
clearInterval(this.touchHoldTimeout);
}
};

HandMorph.prototype.processTouchEnd = function (event) {
MorphicPreferences.isTouchDevice = true;
clearInterval(this.touchHoldTimeout);
nop(event);
this.processMouseUp({button: 0});
};

HandMorph.prototype.processMouseUp = function () {
var morph = this.morphAtPointer(),
context,
contextMenu,
expectedClick;

this.destroyTemporaries();
if (this.children.length !== 0) {
this.drop();
} else {
if (this.mouseButton === 'left') {
expectedClick = 'mouseClickLeft';
} else {
expectedClick = 'mouseClickRight';
if (this.mouseButton && this.contextMenuEnabled) {
context = morph;
contextMenu = context.contextMenu();
while ((!contextMenu) &&
context.parent) {
context = context.parent;
contextMenu = context.contextMenu();
}
if (contextMenu) {
contextMenu.popUpAtHand(this.world);
}
}
}
while (!morph[expectedClick]) {
morph = morph.parent;
}
morph[expectedClick](this.bounds.origin);
}
this.mouseButton = null;
};

HandMorph.prototype.processDoubleClick = function () {
var morph = this.morphAtPointer();

this.destroyTemporaries();
if (this.children.length !== 0) {
this.drop();
} else {
while (morph && !morph.mouseDoubleClick) {
morph = morph.parent;
}
if (morph) {
morph.mouseDoubleClick(this.bounds.origin);
}
}
this.mouseButton = null;
};

HandMorph.prototype.processMouseMove = function (event) {
var pos,
posInDocument = getDocumentPositionOf(this.world.worldCanvas),
mouseOverNew,
mouseOverBoundsNew,
morph,
topMorph;

pos = new Point(
event.pageX - posInDocument.x,
event.pageY - posInDocument.y
);

this.setPosition(pos);

// determine the new mouse-over-list:
mouseOverNew = this.morphAtPointer().allParents();
mouseOverBoundsNew = mouseOverNew.filter(m => m.isVisible &&
m.visibleBounds().containsPoint(this.bounds.origin) &&
!m.holes.some(any =>
any.translateBy(m.position()).containsPoint(this.bounds.origin))
);

if (!this.children.length && this.mouseButton) {
topMorph = this.morphAtPointer();
morph = topMorph.rootForGrab();
if (topMorph.mouseMove) {
topMorph.mouseMove(pos, this.mouseButton);
if (this.mouseButton === 'right') {
this.contextMenuEnabled = false;
}
}

// if a morph is marked for grabbing, just grab it
if (this.mouseButton === 'left' &&
this.morphToGrab &&
(this.grabPosition.distanceTo(this.bounds.origin) >
MorphicPreferences.grabThreshold)) {
this.setPosition(this.grabPosition);
if (this.morphToGrab.isDraggable) {
morph = this.morphToGrab.selectForEdit ?
this.morphToGrab.selectForEdit() : this.morphToGrab;
this.grab(morph);
} else if (this.morphToGrab.isTemplate) {
this.world.stopEditing();
morph = this.morphToGrab.fullCopy();
morph.isTemplate = false;
morph.isDraggable = true;
if (morph.reactToTemplateCopy) {
morph.reactToTemplateCopy();
}
this.grab(morph);
this.grabOrigin = this.morphToGrab.situation();
}
this.setPosition(pos);
}
}

this.mouseOverBounds.forEach(old => {
if (!contains(mouseOverBoundsNew, old)) {
if (old.mouseLeaveBounds) {
old.mouseLeaveBounds(this.children[0]);
}
}
});
mouseOverBoundsNew.forEach(newMorph => {
if (!contains(this.mouseOverBounds, newMorph)) {
if (newMorph.mouseEnterBounds) {
newMorph.mouseEnterBounds(this.children[0]);
}
}
});

this.mouseOverList.forEach(old => {
if (!contains(mouseOverNew, old)) {
if (old.mouseLeave) {
old.mouseLeave();
}
if (old.mouseLeaveDragging && this.mouseButton) {
old.mouseLeaveDragging(this.children[0]);
}
}
});
mouseOverNew.forEach(newMorph => {
if (!contains(this.mouseOverList, newMorph)) {
if (newMorph.mouseEnter) {
newMorph.mouseEnter();
}
if (newMorph.mouseEnterDragging && this.mouseButton) {
newMorph.mouseEnterDragging(this.children[0]);
}
}

// autoScrolling support:
if (this.children.length > 0) {
if (newMorph instanceof ScrollFrameMorph &&
newMorph.enableAutoScrolling &&
newMorph.contents.allChildren().some(any => {
return any.wantsDropOf(this.children[0]);
})
) {
if (!newMorph.bounds.insetBy(
MorphicPreferences.scrollBarSize * 3
).containsPoint(this.bounds.origin)) {
newMorph.startAutoScrolling();
}
}
}
});
this.mouseOverList = mouseOverNew;
this.mouseOverBounds = mouseOverBoundsNew;
};

HandMorph.prototype.processMouseScroll = function (event) {
var morph = this.morphAtPointer();
while (morph && !morph.mouseScroll) {
morph = morph.parent;
}
if (morph) {
morph.mouseScroll(
(event.detail / -3) || (
Object.prototype.hasOwnProperty.call(
event,
'wheelDeltaY'
) ?
event.wheelDeltaY / 120 :
event.wheelDelta / 120
),
event.wheelDeltaX / 120 || 0
);
}
};

/*
drop event:

droppedImage
droppedSVG
droppedAudio
droppedText

beginBulkDrop
endBulkDrop
*/

HandMorph.prototype.processDrop = function (event) {
/*
find out whether an external image or audio file was dropped
onto the world canvas, turn it into an offscreen canvas or audio
element and dispatch the

droppedImage(canvas, name)
droppedSVG(image, name)
droppedAudio(audio, name)
droppedText(text, name, type)

events to interested Morphs at the mouse pointer.

In case multiple files are dropped simulateneously also displatch
the events

beginBulkDrop()
endBulkDrop()

to Morphs interested in bracketing the bulk operation
*/
var files = event instanceof FileList ? event
: event.target.files || event.dataTransfer.files,
file,
fileCount,
url = event.dataTransfer ?
event.dataTransfer.getData('URL') : null,
txt = event.dataTransfer ?
event.dataTransfer.getData('Text/HTML') : null,
suffix,
src,
target = this.morphAtPointer(),
img = new Image(),
canvas,
i;

function readSVG(aFile) {
var pic = new Image(),
frd = new FileReader(),
trg = target;
while (!trg.droppedSVG) {
trg = trg.parent;
}
pic.onload = () => {
trg.droppedSVG(pic, aFile.name);
bulkDrop();
};
frd = new FileReader();
frd.onloadend = (e) => pic.src = e.target.result;
frd.readAsDataURL(aFile);
}

function readImage(aFile) {
var pic = new Image(),
frd = new FileReader(),
trg = target;
while (!trg.droppedImage) {
trg = trg.parent;
}
pic.onload = () => {
canvas = newCanvas(new Point(pic.width, pic.height), true);
canvas.getContext('2d').drawImage(pic, 0, 0);
trg.droppedImage(canvas, aFile.name);
bulkDrop();
};
frd = new FileReader();
frd.onloadend = (e) => pic.src = e.target.result;
frd.readAsDataURL(aFile);
}

function readAudio(aFile) {
var snd = new Audio(),
frd = new FileReader(),
trg = target;
while (!trg.droppedAudio) {
trg = trg.parent;
}
frd.onloadend = (e) => {
snd.src = e.target.result;
trg.droppedAudio(snd, aFile.name);
bulkDrop();
};
frd.readAsDataURL(aFile);
}

function readText(aFile) {
var frd = new FileReader(),
trg = target;
while (!trg.droppedText) {
trg = trg.parent;
}
frd.onloadend = (e) => {
trg.droppedText(e.target.result, aFile.name, aFile.type);
bulkDrop();
};
frd.readAsText(aFile);
}

function readBinary(aFile) {
var frd = new FileReader(),
trg = target;
while (!trg.droppedBinary) {
trg = trg.parent;
}
frd.onloadend = (e) => {
trg.droppedBinary(e.target.result, aFile.name);
bulkDrop();
};
frd.readAsArrayBuffer(aFile);
}

function beginBulkDrop() {
var trg = target;
while (!trg.beginBulkDrop) {
trg = trg.parent;
}
trg.beginBulkDrop();
}

function bulkDrop() {
var trg = target;
fileCount -= 1;
if (files.length > 1 && fileCount === 0) {
while (!trg.endBulkDrop) {
trg = trg.parent;
}
trg.endBulkDrop();
}
}

function readURL(url, callback) {
var request = new XMLHttpRequest();
request.open('GET', url);
request.onreadystatechange = () => {
if (request.readyState === 4) {
if (request.responseText) {
callback(request.responseText);
} else {
throw new Error('unable to retrieve ' + url);
}
}
};
request.send();
}

function parseImgURL(html) {
var iurl = '',
idx,
c,
start = html.indexOf('<img src="');
if (start === -1) {return null; }
start += 10;
for (idx = start; idx < html.length; idx += 1) {
c = html[idx];
if (c === '"') {
return iurl;
}
iurl = iurl.concat(c);
}
return null;
}

if (files.length > 0) {
fileCount = files.length;
if (fileCount > 1) {
beginBulkDrop();
}
for (i = 0; i < files.length; i += 1) {
file = files[i];
suffix = file.name.slice(
file.name.lastIndexOf('.') + 1
).toLowerCase();
if (file.type.indexOf("svg") !== -1
&& !MorphicPreferences.rasterizeSVGs) {
readSVG(file);
} else if (file.type.indexOf("image") === 0) {
readImage(file);
} else if (file.type.indexOf("audio") === 0 ||
file.type.indexOf("ogg") > -1) {
// check the file-extension because Firefox
// thinks OGGs are videos
readAudio(file);
} else if ((file.type.indexOf("text") === 0) ||
contains(['txt', 'csv', 'json'], suffix)) {
// check the file-extension because Windows
// doesn't specify CSVs to be text/csv, sigh
readText(file);
} else { // assume it's meant to be binary
readBinary(file);
}
}
} else if (url) {
suffix = url.slice(url.lastIndexOf('.') + 1).toLowerCase();
if (
contains(
['gif', 'png', 'jpg', 'jpeg', 'bmp'],
suffix
)
) {
while (!target.droppedImage) {
target = target.parent;
}
img = new Image();
img.onload = () => {
canvas = newCanvas(new Point(img.width, img.height), true);
canvas.getContext('2d').drawImage(img, 0, 0);
target.droppedImage(canvas);
};
img.src = url;
} else if (suffix === 'svg' && !MorphicPreferences.rasterizeSVGs) {
while (!target.droppedSVG) {
target = target.parent;
}
readURL(
url,
txt => {
var pic = new Image();
pic.onload = () => {
target.droppedSVG(
pic,
url.slice(
url.lastIndexOf('/') + 1,
url.lastIndexOf('.')
)
);
};
pic.src = 'data:image/svg+xml;utf8,' +
encodeURIComponent(txt);
}
);
}
} else if (txt) {
while (!target.droppedImage) {
target = target.parent;
}
img = new Image();
img.onload = () => {
canvas = newCanvas(new Point(img.width, img.height), true);
canvas.getContext('2d').drawImage(img, 0, 0);
target.droppedImage(canvas);
};
src = parseImgURL(txt);
if (src) {img.src = src; }
}
};

// HandMorph tools

HandMorph.prototype.destroyTemporaries = function () {
/*
temporaries are just an array of morphs which will be deleted upon
the next mouse click, or whenever another temporary Morph decides
that it needs to remove them. The primary purpose of temporaries is
to display tools tips of speech bubble help.
*/
this.temporaries.forEach(morph => {
if (!(morph.isClickable
&& morph.bounds.containsPoint(this.position()))) {
morph.destroy();
this.temporaries.splice(this.temporaries.indexOf(morph), 1);
}
});
};

// WorldMorph //////////////////////////////////////////////////////////

// I represent the <canvas> element

// WorldMorph inherits from FrameMorph:

WorldMorph.prototype = new FrameMorph();
WorldMorph.prototype.constructor = WorldMorph;
WorldMorph.uber = FrameMorph.prototype;

// WorldMorph global settings & examples

WorldMorph.prototype.customMorphs = [];

// WorldMorph instance creation:

function WorldMorph(aCanvas, fillPage) {
this.init(aCanvas, fillPage);
}

// WorldMorph initialization:

WorldMorph.prototype.init = function (aCanvas, fillPage) {
WorldMorph.uber.init.call(this);
this.color = new Color(205, 205, 205);
this.alpha = 1;
this.bounds = new Rectangle(0, 0, aCanvas.width, aCanvas.height);
this.isVisible = true;
this.isDraggable = false;
this.currentKey = null; // currently pressed key code
this.worldCanvas = aCanvas;

// additional properties:
this.stamp = Date.now(); // reference in multi-world setups
while (this.stamp === Date.now()) {nop(); }
this.stamp = Date.now();

this.useFillPage = fillPage;
if (this.useFillPage === undefined) {
this.useFillPage = true;
}
this.isDevMode = false;
this.broken = [];
this.animations = [];
this.hand = new HandMorph(this);
this.keyboardHandler = null;
this.keyboardFocus = null;
this.cursor = null;
this.lastEditedText = null;
this.activeMenu = null;
this.activeHandle = null;

this.initKeyboardHandler();
this.resetKeyboardHandler();
this.initEventListeners();
};

// World Morph display:

WorldMorph.prototype.fullDrawOn = function (aContext, aRect) {
WorldMorph.uber.fullDrawOn.call(this, aContext, aRect);
this.hand.fullDrawOn(aContext, aRect);
};

WorldMorph.prototype.updateBroken = function () {
var ctx = this.worldCanvas.getContext('2d');
this.condenseDamages();
this.broken.forEach(rect => {
if (rect.extent().gt(ZERO)) {
this.fullDrawOn(ctx, rect);
}
});
this.broken = [];
};

WorldMorph.prototype.stepAnimations = function () {
this.animations.forEach(anim => anim.step());
this.animations = this.animations.filter(anim => anim.isActive);
};

WorldMorph.prototype.condenseDamages = function () {
// collapse clustered damaged rectangles into their unions,
// thereby reducing the array of brokens to a manageable size

function condense(src) {
var trgt = [],
len = src.length,
rect,
test = each => each.isNearTo(rect, 20),
hit, i;

for (i = 0; i < len; i += 1) {
rect = src[i];
hit = detect(trgt, test);
if (hit) {
hit.mergeWith(rect);
} else {
trgt.push(rect);
}
}
return trgt;
}

function mergeAll(rects) {
var left = rects[0].origin.x,
top = rects[0].origin.y,
right = rects[0].corner.x,
bottom = rects[0].corner.y,
len = rects.length,
each,
i;

for (i = 1; i < len; i += 1) {
each = rects[i];
left = Math.min(left, each.origin.x);
top = Math.min(top, each.origin.y);
right = Math.max(right, each.corner.x);
bottom = Math.max(bottom, each.corner.y);
}

return new Rectangle(left, top, right, bottom);
}

if (this.broken.length > 1000) {
this.broken = [mergeAll(this.broken)];
} else {
this.broken = condense(this.broken);
}

/* // overly eager reduction algorithm, commented out for performance
var again = true,
size = this.broken.length;

while (again) {
this.broken = condense(this.broken);
again = (this.broken.length < size);
size = this.broken.length;
}
*/
};

WorldMorph.prototype.doOneCycle = function () {
this.stepFrame();
this.stepAnimations();
this.updateBroken();
};

WorldMorph.prototype.fillPage = function () {
var clientHeight = window.innerHeight,
clientWidth = window.innerWidth;

this.worldCanvas.style.position = "absolute";
this.worldCanvas.style.left = "0px";
this.worldCanvas.style.right = "0px";
this.worldCanvas.style.width = "100%";
this.worldCanvas.style.height = "100%";

if (document.documentElement.scrollTop) {
// scrolled down b/c of viewport scaling
clientHeight = document.documentElement.clientHeight;
}
if (document.documentElement.scrollLeft) {
// scrolled left b/c of viewport scaling
clientWidth = document.documentElement.clientWidth;
}
if (this.worldCanvas.width !== clientWidth) {
this.worldCanvas.width = clientWidth;
this.setWidth(clientWidth);
}
if (this.worldCanvas.height !== clientHeight) {
this.worldCanvas.height = clientHeight;
this.setHeight(clientHeight);
}
this.children.forEach(child => {
if (child.reactToWorldResize) {
child.reactToWorldResize(this.bounds.copy());
}
});
};

// WorldMorph global pixel access:

WorldMorph.prototype.getGlobalPixelColor = function (point) {
// answer the color at the given point.
var dta = this.worldCanvas.getContext('2d').getImageData(
point.x,
point.y,
1,
1
).data;
return new Color(dta[0], dta[1], dta[2]);
};

// WorldMorph events:

WorldMorph.prototype.initKeyboardHandler = function () {
var kbd = document.getElementById('morphic_keyboard');
if (kbd) { // share existing handler with other worlds
this.keyboardHandler = kbd;
return;
}
kbd = document.createElement('textarea');
kbd.setAttribute('id', 'morphic_keyboard');
kbd.setAttribute('style', 'caret-color:transparent;');
kbd.style.position = 'absolute';
kbd.style.overflow = "hidden";
kbd.style.border = 'none';
kbd.style.resize = 'none';
kbd.wrap = "off";
kbd.world = this;
kbd.style.zIndex = -1;
kbd.autofocus = true;
document.body.appendChild(kbd);
this.keyboardHandler = kbd;

kbd.addEventListener(
"keydown",
event => {
// remember the keyCode in the world's currentKey property
kbd.world.currentKey = event.keyCode;
if (kbd.world.activeMenu && !kbd.world.activeMenu.hasFocus) {
kbd.world.stopEditing();
kbd.world.activeMenu.getFocus();
}
if (kbd.world.keyboardFocus &&
kbd.world.keyboardFocus.processKeyDown) {
kbd.world.keyboardFocus.processKeyDown(event);
}
// suppress tab override and make sure tab gets
// received by all browsers
if (event.keyCode === 9) {
if (kbd.world.keyboardFocus &&
kbd.world.keyboardFocus.processKeyPress) {
kbd.world.keyboardFocus.processKeyPress(event);
}
event.preventDefault();
}
// suppress cmd-d/f/i/p/s override
if ((event.ctrlKey || event.metaKey) &&
'dfiops'.includes(event.key)) {
event.preventDefault();
}
},
true
);

kbd.addEventListener(
"keyup",
event => {
// flush the world's currentKey property
kbd.world.currentKey = null;
// dispatch to keyboard receiver
if (kbd.world.keyboardFocus &&
kbd.world.keyboardFocus.processKeyUp) {
kbd.world.keyboardFocus.processKeyUp(event);
}
event.preventDefault();
},
false
);

kbd.addEventListener(
"keypress",
event => {
if (kbd.world.keyboardFocus &&
kbd.world.keyboardFocus.processKeyPress) {
kbd.world.keyboardFocus.processKeyPress(event);
event.preventDefault();
}
},
false
);

kbd.addEventListener(
"input",
event => {
if (kbd.world.keyboardFocus &&
kbd.world.keyboardFocus.processInput) {
// flush the world's currentKey property
kbd.world.currentKey = null;
kbd.world.keyboardFocus.processInput(event);
} else {
kbd.world.keyboardHandler.value = '';
}
event.preventDefault();
},
false
);
};

WorldMorph.prototype.resetKeyboardHandler = function (keepValue) {
var pos = getDocumentPositionOf(this.worldCanvas);

function number2px (n) {
return Math.ceil(n) + 'px';
}

if (!keepValue) {
this.keyboardHandler.value = '';
}
this.keyboardHandler.style.top = number2px(pos.y);
this.keyboardHandler.style.left = number2px(pos.x);
};

WorldMorph.prototype.initEventListeners = function () {
var canvas = this.worldCanvas;

if (this.useFillPage) {
this.fillPage();
} else {
this.changed();
}

canvas.addEventListener(
"mousedown",
event => {
event.preventDefault();
this.keyboardHandler.world = this; // focus the current world
this.resetKeyboardHandler(true); // keep the handler's value
if (!this.onNextStep) {
// horrible kludge to keep Safari from popping up
// a overlay when right-clicking out of a focused
// and edited text or string element
this.keyboardHandler.blur();
this.onNextStep = () => this.keyboardHandler.focus();
}
this.hand.processMouseDown(event);
},
true
);

canvas.addEventListener(
"touchstart",
event => this.hand.processTouchStart(event),
false
);

canvas.addEventListener(
"mouseup",
event => {
event.preventDefault();
this.hand.processMouseUp(event);
},
false
);

canvas.addEventListener(
"dblclick",
event => {
event.preventDefault();
this.hand.processDoubleClick(event);
},
false
);

canvas.addEventListener(
"touchend",
event => this.hand.processTouchEnd(event),
false
);

canvas.addEventListener(
"mousemove",
event => this.hand.processMouseMove(event),
false
);

canvas.addEventListener(
"touchmove",
event => this.hand.processTouchMove(event),
{passive: true}
);

canvas.addEventListener(
"contextmenu",
event => event.preventDefault(),
true // suppress context menu for Mac-Firefox
);

canvas.addEventListener( // Safari, Chrome
"mousewheel",
event => {
this.hand.processMouseScroll(event);
event.preventDefault();
},
false
);
canvas.addEventListener( // Firefox
"DOMMouseScroll",
event => {
this.hand.processMouseScroll(event);
event.preventDefault();
},
false
);

window.addEventListener(
"dragover",
event => event.preventDefault(),
true
);
window.addEventListener(
"drop",
event => {
this.hand.processDrop(event);
event.preventDefault();
},
false
);

window.addEventListener(
"resize",
() => {
if (this.useFillPage) {
this.fillPage();
}
},
false
);

window.onbeforeunload = (evt) => {
var e = evt || window.event,
msg = "Are you sure you want to leave?";
// For IE and Firefox
if (e) {
e.returnValue = msg;
}
// For Safari / chrome
return msg;
};
};

WorldMorph.prototype.mouseDownLeft = nop;

WorldMorph.prototype.mouseClickLeft = nop;

WorldMorph.prototype.mouseDownRight = nop;

WorldMorph.prototype.mouseClickRight = nop;

WorldMorph.prototype.wantsDropOf = function () {
// allow handle drops if any drops are allowed
return this.acceptsDrops;
};

WorldMorph.prototype.droppedImage = nop;

WorldMorph.prototype.droppedSVG = nop;

WorldMorph.prototype.droppedAudio = nop;

WorldMorph.prototype.droppedText = nop;

WorldMorph.prototype.beginBulkDrop = nop;

WorldMorph.prototype.endBulkDrop = nop;

// WorldMorph text field tabbing:

WorldMorph.prototype.nextTab = function (editField) {
var next = this.nextEntryField(editField);
if (next) {
editField.clearSelection();
next.selectAll();
next.edit();
}
};

WorldMorph.prototype.previousTab = function (editField) {
var prev = this.previousEntryField(editField);
if (prev) {
editField.clearSelection();
prev.selectAll();
prev.edit();
}
};

// WorldMorph menu:

WorldMorph.prototype.contextMenu = function () {
var menu;

if (this.isDevMode) {
menu = new MenuMorph(this, this.constructor.name ||
this.constructor.toString().split(' ')[1].split('(')[0]);
} else {
menu = new MenuMorph(this, 'Morphic');
}
if (this.isDevMode) {
menu.addItem("demo...", 'userCreateMorph', 'sample morphs');
menu.addLine();
menu.addItem("hide all...", 'hideAll');
menu.addItem("show all...", 'showAllHiddens');
menu.addItem(
"move all inside...",
'keepAllSubmorphsWithin',
'keep all submorphs\nwithin and visible'
);
menu.addItem(
"inspect...",
'inspect',
'open a window on\nall properties'
);
menu.addItem(
"screenshot...",
() => window.open(this.fullImage().toDataURL()),
'open a new window\nwith a picture of this morph'
);
menu.addLine();
menu.addItem(
"restore display",
'changed',
'redraw the\nscreen once'
);
menu.addItem(
"fill page...",
'fillPage',
'let the World automatically\nadjust to browser resizing'
);
if (useBlurredShadows) {
menu.addItem(
"sharp shadows...",
'toggleBlurredShadows',
'sharp drop shadows\nuse for old browsers'
);
} else {
menu.addItem(
"blurred shadows...",
'toggleBlurredShadows',
'blurry shades,\n use for new browsers'
);
}
menu.addItem(
"color...",
() => {
this.pickColor(
menu.title + localize('\ncolor:'),
this.setColor,
this,
this.color
);
},
'choose the World\'s\nbackground color'
);
if (MorphicPreferences === standardSettings) {
menu.addItem(
"touch screen settings",
'togglePreferences',
'bigger menu fonts\nand sliders'
);
} else {
menu.addItem(
"standard settings",
'togglePreferences',
'smaller menu fonts\nand sliders'
);
}
if (MorphicPreferences.showHoles) {
menu.addItem(
'hide holes',
'toggleHolesDisplay',
'debug untouchable regions'
);
} else {
menu.addItem(
'show holes',
'toggleHolesDisplay',
'debug untouchable regions'
);
}
menu.addLine();
}
if (this.isDevMode) {
menu.addItem(
"user mode...",
'toggleDevMode',
'disable developers\'\ncontext menus'
);
} else {
menu.addItem("development mode...", 'toggleDevMode');
}
menu.addItem("about morphic.js...", 'about');
return menu;
};

WorldMorph.prototype.userCreateMorph = function () {
var myself = this, menu, newMorph;

function create(aMorph) {
var cpy = aMorph.fullCopy();
cpy.isDraggable = true;
cpy.pickUp(myself);
}

menu = new MenuMorph(this, 'make a morph');
menu.addItem('rectangle', () => create(new Morph()));
menu.addItem('box', () => create(new BoxMorph()));
menu.addItem('circle box', () => create(new CircleBoxMorph()));
menu.addLine();
menu.addItem('slider', () => create(new SliderMorph()));
menu.addItem('dial', () => {
newMorph = new DialMorph();
newMorph.pickUp(this);
});
menu.addItem('frame', () => {
newMorph = new FrameMorph();
newMorph.setExtent(new Point(350, 250));
create(newMorph);
});
menu.addItem('scroll frame', () => {
newMorph = new ScrollFrameMorph();
newMorph.contents.acceptsDrops = true;
newMorph.contents.adjustBounds();
newMorph.setExtent(new Point(350, 250));
create(newMorph);
});
menu.addItem('handle', () => create(new HandleMorph()));
menu.addLine();
menu.addItem('string', () => {
newMorph = new StringMorph('Hello, World!');
newMorph.isEditable = true;
create(newMorph);
});
menu.addItem('text', () => {
newMorph = new TextMorph(
"Ich wei\u00DF nicht, was soll es bedeuten, dass ich so " +
"traurig bin, ein M\u00E4rchen aus uralten Zeiten, das " +
"kommt mir nicht aus dem Sinn. Die Luft ist k\u00FChl " +
"und es dunkelt, und ruhig flie\u00DFt der Rhein; der " +
"Gipfel des Berges funkelt im Abendsonnenschein. " +
"Die sch\u00F6nste Jungfrau sitzet dort oben wunderbar, " +
"ihr gold'nes Geschmeide blitzet, sie k\u00E4mmt ihr " +
"goldenes Haar, sie k\u00E4mmt es mit goldenem Kamme, " +
"und singt ein Lied dabei; das hat eine wundersame, " +
"gewalt'ge Melodei. Den Schiffer im kleinen " +
"Schiffe, ergreift es mit wildem Weh; er schaut " +
"nicht die Felsenriffe, er schaut nur hinauf in " +
"die H\u00F6h'. Ich glaube, die Wellen verschlingen " +
"am Ende Schiffer und Kahn, und das hat mit ihrem " +
"Singen, die Loreley getan."
);
newMorph.isEditable = true;
newMorph.maxWidth = 300;
newMorph.fixLayout();
create(newMorph);
});
menu.addItem('speech bubble', () => {
newMorph = new SpeechBubbleMorph('Hello, World!');
create(newMorph);
});
menu.addLine();
menu.addItem('gray scale palette', () => create(new GrayPaletteMorph()));
menu.addItem('color palette', () => create(new ColorPaletteMorph()));
menu.addItem('color picker', () => create(new ColorPickerMorph()));
menu.addLine();
menu.addItem('sensor demo', () => {
newMorph = new MouseSensorMorph();
newMorph.setColor(new Color(230, 200, 100));
newMorph.edge = 35;
newMorph.border = 15;
newMorph.borderColor = new Color(200, 100, 50);
newMorph.alpha = 0.2;
newMorph.setExtent(new Point(100, 100));
create(newMorph);
});
menu.addItem('animation demo', () => {
var foo, bar, baz, garply, fred;

foo = new BouncerMorph();
foo.setPosition(new Point(50, 20));
foo.setExtent(new Point(300, 200));
foo.alpha = 0.9;
foo.speed = 3;

bar = new BouncerMorph();
bar.setColor(new Color(50, 50, 50));
bar.setPosition(new Point(80, 80));
bar.setExtent(new Point(80, 250));
bar.type = 'horizontal';
bar.direction = 'right';
bar.alpha = 0.9;
bar.speed = 5;

baz = new BouncerMorph();
baz.setColor(new Color(20, 20, 20));
baz.setPosition(new Point(90, 140));
baz.setExtent(new Point(40, 30));
baz.type = 'horizontal';
baz.direction = 'right';
baz.speed = 3;

garply = new BouncerMorph();
garply.setColor(new Color(200, 20, 20));
garply.setPosition(new Point(90, 140));
garply.setExtent(new Point(20, 20));
garply.type = 'vertical';
garply.direction = 'up';
garply.speed = 8;

fred = new BouncerMorph();
fred.setColor(new Color(20, 200, 20));
fred.setPosition(new Point(120, 140));
fred.setExtent(new Point(20, 20));
fred.type = 'vertical';
fred.direction = 'down';
fred.speed = 4;

bar.add(garply);
bar.add(baz);
foo.add(fred);
foo.add(bar);

create(foo);
});
menu.addItem('pen', () => create(new PenMorph()));
if (this.customMorphs.length) {
menu.addLine();
this.customMorphs.forEach(item => {
var sub;
if (item instanceof Array) { // assume [name, [morphs]]
sub = new MenuMorph();
item[1].forEach(morph => sub.addItem(morph,
() => create(morph instanceof Array ? morph[0] : morph)));
menu.addMenu(item[0], sub);
} else { // assume a Morph
menu.addItem(item.toString(), () => create(item));
}
});
}
menu.popUpAtHand(this);
};

WorldMorph.prototype.toggleDevMode = function () {
this.isDevMode = !this.isDevMode;
};

WorldMorph.prototype.hideAll = function () {
this.children.forEach(child => child.hide());
};

WorldMorph.prototype.showAllHiddens = function () {
this.forAllChildren(child => {
if (!child.isVisible) {
child.show();
}
});
};

WorldMorph.prototype.about = function () {
var versions = '', module;

for (module in modules) {
if (Object.prototype.hasOwnProperty.call(modules, module)) {
versions += ('\n' + module + ' (' + modules[module] + ')');
}
}
if (versions !== '') {
versions = '\n\nmodules:\n\n' +
'morphic (' + morphicVersion + ')' +
versions;
}

this.inform(
'morphic.js\n\n' +
'a lively Web GUI\ninspired by Squeak\n' +
morphicVersion +
'\n\nwritten by Jens M\u00F6nig\njens@moenig.org' +
versions
);
};

WorldMorph.prototype.edit = function (aStringOrTextMorph) {
if (this.lastEditedText === aStringOrTextMorph) {
return;
}
if (!isNil(this.lastEditedText)) {
this.stopEditing();
}
if (!aStringOrTextMorph.isEditable) {
return null;
}
if (this.cursor) {
this.cursor.destroy();
}

// some magic we apparently need for Android
this.worldCanvas.focus();
this.keyboardHandler.focus();

// create a new cursor
this.cursor = new CursorMorph(aStringOrTextMorph, this.keyboardHandler);
this.keyboardFocus = this.cursor;
aStringOrTextMorph.parent.add(this.cursor);
this.cursor.rerender();
if (MorphicPreferences.useSliderForInput) {
if (!aStringOrTextMorph.parentThatIsA(MenuMorph)) {
this.slide(aStringOrTextMorph);
}
}
if (this.lastEditedText !== aStringOrTextMorph) {
aStringOrTextMorph.escalateEvent('freshTextEdit', aStringOrTextMorph);
}
this.lastEditedText = aStringOrTextMorph;
};

WorldMorph.prototype.slide = function (aStringOrTextMorph) {
// display a slider for numeric text entries
var val = parseFloat(aStringOrTextMorph.text),
menu,
slider;

if (isNaN(val)) {
val = 0;
}
menu = new MenuMorph();
slider = new SliderMorph(
val - 25,
val + 25,
val,
10,
'horizontal'
);
slider.alpha = 1;
slider.color = new Color(225, 225, 225);
slider.button.color = menu.borderColor;
slider.button.highlightColor = slider.button.color.copy();
slider.button.highlightColor.b += 100;
slider.button.pressColor = slider.button.color.copy();
slider.button.pressColor.b += 150;
slider.setExtent(new Point(
MorphicPreferences.scrollBarSize * 10,
MorphicPreferences.menuFontSize
));
slider.action = (num) => {
aStringOrTextMorph.changed();
aStringOrTextMorph.text = Math.round(num).toString();
aStringOrTextMorph.fixLayout();
aStringOrTextMorph.rerender();
aStringOrTextMorph.escalateEvent(
'reactToSliderEdit',
aStringOrTextMorph
);
};
menu.items.push(slider);
menu.popup(this, aStringOrTextMorph.bottomLeft().add(new Point(0, 5)));
};

WorldMorph.prototype.stopEditing = function () {
if (this.cursor) {
this.cursor.target.escalateEvent('reactToEdit', this.cursor.target);
this.cursor.target.clearSelection();
this.cursor.destroy();
this.cursor = null;
}
if (this.keyboardFocus && this.keyboardFocus.stopEditing) {
this.keyboardFocus.stopEditing();
}
this.keyboardFocus = null;
this.lastEditedText = null;
};

WorldMorph.prototype.toggleBlurredShadows = function () {
useBlurredShadows = !useBlurredShadows;
};

WorldMorph.prototype.togglePreferences = function () {
if (MorphicPreferences === standardSettings) {
MorphicPreferences = touchScreenSettings;
} else {
MorphicPreferences = standardSettings;
}
};

WorldMorph.prototype.toggleHolesDisplay = function () {
MorphicPreferences.showHoles = !MorphicPreferences.showHoles;
this.rerender();
};

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