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* Paper.js - The Swiss Army Knife of Vector Graphics Scripting.
* http://paperjs.org/
*
* Copyright (c) 2011 - 2020, Jürg Lehni & Jonathan Puckey
* http://juerglehni.com/ & https://puckey.studio/
*
* Distributed under the MIT license. See LICENSE file for details.
*
* All rights reserved.
*/
// TODO: remove eslint-disable comment and deal with errors over time
/* eslint-disable */
import { ref } from '~/globals';
import { Base } from '~/straps';
import { PaperScope } from '~/core/PaperScope';
import { Matrix } from '~/basic/Matrix';
import { Point, LinkedPoint } from '~/basic/Point';
import { Rectangle } from '~/basic/Rectangle';
import { Size, LinkedSize } from '~/basic/Size';
import { Emitter } from '~/core/Emitter';
import { DomElement } from '~/dom/DomElement';
import { DomEvent } from '~/dom/DomEvent';
import { Change } from '~/item/ChangeFlag';
import { Item } from '~/item/Item';
import { Stats } from '../stats';
/**
* @name View
*
* @class The View object wraps an HTML element and handles drawing and user
* interaction through mouse and keyboard for it. It offer means to scroll the
* view, find the currently visible bounds in project coordinates, or the
* center, both useful for constructing artwork that should appear centered on
* screen.
*/
export const View = Base.extend(
Emitter,
/** @lends View# */ {
_class: 'View',
initialize: function View(project, element) {
function getSize(name) {
return element[name] || parseInt(element.getAttribute(name), 10);
}
function getCanvasSize() {
// Try visible size first, since that will help handling previously
// scaled canvases (e.g. when dealing with pixel-ratio)
var size = DomElement.getSize(element);
return size.isNaN() || size.isZero()
? // If the element is invisible, we cannot directly access
// element.width / height, because they would appear 0.
// Reading the attributes should still work.
new Size(getSize('width'), getSize('height'))
: size;
}
var size;
if (globalThis.window && element) {
// Generate an id for this view / element if it does not have one
this._id = element.getAttribute('id');
if (this._id == null)
// @ts-expect-error = Property '_id' does not exist on type
element.setAttribute('id', (this._id = 'paper-view-' + View._id++));
// Install event handlers
DomEvent.add(element, this._viewEvents);
// Borrowed from Hammer.js:
var none = 'none';
DomElement.setPrefixed(element.style, {
userDrag: none,
userSelect: none,
touchCallout: none,
contentZooming: none,
tapHighlightColor: 'rgba(0,0,0,0)',
});
// If the element has the resize attribute, listen to resize events
// and update its coordinate space accordingly
if (PaperScope.hasAttribute(element, 'resize')) {
var that = this;
DomEvent.add(
globalThis.window,
(this._windowEvents = {
resize: function () {
that.setViewSize(getCanvasSize());
},
})
);
}
size = getCanvasSize();
if (PaperScope.hasAttribute(element, 'stats') && typeof Stats !== 'undefined') {
// @ts-expect-error
this._stats = new Stats();
// Align top-left to the element
var stats = this._stats.domElement,
style = stats.style,
offset = DomElement.getOffset(element);
style.position = 'absolute';
style.left = offset.x + 'px';
style.top = offset.y + 'px';
globalThis.document.body.appendChild(stats);
}
} else {
// For web-workers: Allow calling of `paper.setup(new Size(x, y));`
size = new Size(element);
element = null;
}
// Store reference to the currently active global paper scope, and the
// active project, which will be represented by this view
this._project = project;
this._scope = project._scope;
this._element = element;
// Sub-classes may set _pixelRatio first
if (!this._pixelRatio) this._pixelRatio = (globalThis.window && globalThis.window.devicePixelRatio) || 1;
// Set canvas size even if we just determined the size from it, since
// it might have been set to a % size, in which case it would use some
// default internal size (300x150 on WebKit) and scale up the pixels.
// We also need this call here for HiDPI support.
this._setElementSize(size.width, size.height);
this._viewSize = size;
// Keep track of views internally
// @ts-expect-error = Property does not exist
View._views.push(this);
// Link this id to our view
// @ts-expect-error = Property does not exist
View._viewsById[this._id] = this;
(this._matrix = new Matrix())._owner = this;
// Make sure the first view is focused for keyboard input straight away
// @ts-expect-error = Property does not exist
if (!View._focused) View._focused = this;
// Items that need the onFrame handler called on them
this._frameItems = {};
this._frameItemCount = 0;
// Count the installed native and virtual item events,
// see #_countItemEvent():
this._itemEvents = { native: {}, virtual: {} };
// Do not set _autoUpdate on Node.js by default:
this._autoUpdate = !ref.paper.agent.node;
this._needsUpdate = false;
},
/**
* Removes this view from the project and frees the associated element.
*/
remove: function () {
if (!this._project) return false;
// Clear focus if removed view had it
if (View._focused === this) View._focused = null;
// Remove view from internal structures
View._views.splice(View._views.indexOf(this), 1);
delete View._viewsById[this._id];
// Unlink from project
var project = this._project;
if (project._view === this) project._view = null;
// Uninstall event handlers again for this view.
DomEvent.remove(this._element, this._viewEvents);
DomEvent.remove(globalThis.window, this._windowEvents);
this._element = this._project = null;
// Remove all onFrame handlers.
// TODO: Shouldn't we remove all other event handlers, automatically
this.off('frame');
this._animate = false;
this._frameItems = {};
return true;
},
_events: Base.each(
Item._itemHandlers.concat(['onResize', 'onKeyDown', 'onKeyUp']),
function (name) {
this[name] = {};
},
{
onFrame: {
install: function () {
this.play();
},
uninstall: function () {
this.pause();
},
},
}
),
// These are default values for event related properties on the prototype.
// Writing item._count++ does not change the defaults, it creates / updates
// the property on the instance. Useful!
_animate: false,
_time: 0,
_count: 0,
/**
* Controls whether the view is automatically updated in the next animation
* frame on changes, or whether you prefer to manually call
* {@link #update()} or {@link #requestUpdate()} after changes.
* Note that this is `true` by default, except for Node.js, where manual
* updates make more sense.
*
* @bean
* @type Boolean
*/
getAutoUpdate: function () {
return this._autoUpdate;
},
setAutoUpdate: function (autoUpdate) {
this._autoUpdate = autoUpdate;
if (autoUpdate) this.requestUpdate();
},
/**
* Updates the view if there are changes. Note that when using built-in
* event hanlders for interaction, animation and load events, this method is
* invoked for you automatically at the end.
*
* @return {Boolean} {@true if the view was updated}
*/
update: function () {},
/**
* Updates the view if there are changes.
*
* @deprecated use {@link #update()} instead.
*/
// NOTE: We cannot use draw: '#update'` as that would not work on CanvasView
draw: function () {
this.update();
},
/**
* Requests an update of the view if there are changes through the browser's
* requestAnimationFrame() mechanism for smooth animation. Note that when
* using built-in event handlers for interaction, animation and load events,
* updates are automatically invoked for you automatically at the end.
*/
requestUpdate: function () {
if (!this._requested) {
var that = this;
// @ts-expect-error = Property does not exist
DomEvent.requestAnimationFrame(function () {
that._requested = false;
// Only handle the frame and request the next one if we don't
// need to stop, e.g. due to a call to pause(), or a request
// for a single redraw.
if (that._animate) {
// Request next update before handling the current frame
that.requestUpdate();
var element = that._element;
// Only keep animating if we're allowed to, based on whether
// the document is visible and the setting of keepalive. We
// keep requesting frame regardless though, so the animation
// picks up again as soon as the view is visible.
if (
(!DomElement.getPrefixed(globalThis.document, 'hidden') ||
PaperScope.getAttribute(element, 'keepalive') === 'true') &&
DomElement.isInView(element)
) {
that._handleFrame();
}
}
// Even if we're not animating, update the view now since this
// might have been a request for a single redraw after a change.
// NOTE: If nothing has changed (e.g. _handleFrame() wasn't
// called above), then this does not actually do anything.
if (that._autoUpdate) that.update();
});
this._requested = true;
}
},
/**
* Makes all animation play by adding the view to the request animation
* loop.
*/
play: function () {
this._animate = true;
// Request a frame handler straight away to initialize the
// sequence of onFrame calls.
this.requestUpdate();
},
/**
* Makes all animation pause by removing the view from the request animation
* loop.
*/
pause: function () {
this._animate = false;
},
_handleFrame: function () {
// Set the global paper object to the current scope
ref.paper = this._scope;
var now = Date.now() / 1000,
delta = this._last ? now - this._last : 0;
this._last = now;
// Use new Base() to convert into a Base object, for #toString()
this.emit(
'frame',
new Base({
// Time elapsed since last frame in seconds:
delta: delta,
// Total since first frame in seconds:
time: (this._time += delta),
count: this._count++,
})
);
if (this._stats) this._stats.update();
},
_animateItem: function (item, animate) {
var items = this._frameItems;
if (animate) {
items[item._id] = {
item: item,
// Additional information for the event callback
time: 0,
count: 0,
};
if (++this._frameItemCount === 1) this.on('frame', this._handleFrameItems);
} else {
delete items[item._id];
if (--this._frameItemCount === 0) {
// If this is the last one, just stop animating straight away.
this.off('frame', this._handleFrameItems);
}
}
},
// Handles _frameItems and fires the 'frame' event on them.
_handleFrameItems: function (event) {
for (var i in this._frameItems) {
var entry = this._frameItems[i];
entry.item.emit(
'frame',
new Base(event, {
// Time since first call of frame() in seconds:
time: (entry.time += event.delta),
count: entry.count++,
})
);
}
},
/**
* Private notifier that is called whenever a change occurs in this view.
* Used only by Matrix for now.
*/
_changed: function () {
// The only one calling View._changed() is Matrix, so it can only mean
// one thing:
this._project._changed(/*#=*/ Change.VIEW);
// Force recalculation of these values next time they are requested.
this._bounds = this._decomposed = undefined;
},
/**
* The underlying native element.
*
* @bean
* @type HTMLCanvasElement
*/
getElement: function () {
return this._element;
},
/**
* The ratio between physical pixels and device-independent pixels (DIPs)
* of the underlying canvas / device.
* It is `1` for normal displays, and `2` or more for
* high-resolution displays.
*
* @bean
* @type Number
*/
getPixelRatio: function () {
return this._pixelRatio;
},
/**
* The resolution of the underlying canvas / device in pixel per inch (DPI).
* It is `72` for normal displays, and `144` for high-resolution
* displays with a pixel-ratio of `2`.
*
* @bean
* @type Number
*/
getResolution: function () {
return this._pixelRatio * 72;
},
/**
* The size of the view. Changing the view's size will resize it's
* underlying element.
*
* @bean
* @type Size
*/
getViewSize: function () {
var size = this._viewSize;
return new LinkedSize(size.width, size.height, this, 'setViewSize');
},
setViewSize: function (/* size */) {
var size = Size.read(arguments),
delta = size.subtract(this._viewSize);
if (delta.isZero()) return;
this._setElementSize(size.width, size.height);
this._viewSize.set(size);
this._changed();
// Emit resize event on any size changes.
this.emit('resize', { size: size, delta: delta });
if (this._autoUpdate) {
// Update right away, don't wait for the next animation frame as
// otherwise the view would flicker during resizes, see #1126
this.update();
}
},
/**
* Private method, overridden in CanvasView for HiDPI support.
*/
_setElementSize: function (width, height) {
var element = this._element;
if (element) {
if (element.width !== width) element.width = width;
if (element.height !== height) element.height = height;
}
},
/**
* The bounds of the currently visible area in project coordinates.
*
* @bean
* @type Rectangle
*/
getBounds: function () {
if (!this._bounds)
this._bounds = this._matrix.inverted()._transformBounds(new Rectangle(new Point(), this._viewSize));
return this._bounds;
},
/**
* The size of the visible area in project coordinates.
*
* @bean
* @type Size
*/
getSize: function () {
return this.getBounds().getSize();
},
/**
* Checks whether the view is currently visible within the current browser
* viewport.
*
* @return {Boolean} {@true if the view is visible}
*/
isVisible: function () {
return DomElement.isInView(this._element);
},
/**
* Checks whether the view is inserted into the browser DOM.
*
* @return {Boolean} {@true if the view is inserted}
*/
isInserted: function () {
return DomElement.isInserted(this._element);
},
// Empty stubs of #getPixelSize() and #getTextWidth(), around so that
// web-workers don't fail. Overridden with proper functionality in
// CanvasView.
getPixelSize: function (size) {
var element = this._element,
pixels;
if (element) {
// this code is part of the Firefox workaround in CanvasView, but
// also provides a way to determine pixel-size that does not involve
// a Canvas. It still does not work in a web-worker though.
var parent = element.parentNode,
temp = globalThis.document.createElement('div');
temp.style.fontSize = size;
parent.appendChild(temp);
pixels = parseFloat(DomElement.getStyles(temp).fontSize);
parent.removeChild(temp);
} else {
pixels = parseFloat(pixels);
}
return pixels;
},
getTextWidth: function (font, lines) {
return 0;
},
},
Base.each(
['rotate', 'scale', 'shear', 'skew'],
function (key) {
var rotate = key === 'rotate';
this[key] = function (/* value, center */) {
var args = arguments,
value = (rotate ? Base : Point).read(args),
center = Point.read(args, 0, { readNull: true });
return this.transform(new Matrix()[key](value, center || this.getCenter(true)));
};
},
/** @lends View# */ {
_decompose: function () {
return this._decomposed || (this._decomposed = this._matrix.decompose());
},
/**
* {@grouptitle Transform Functions}
*
* Translates (scrolls) the view by the given offset vector.
*
* @param {Point} delta the offset to translate the view by
*/
translate: function (/* delta */) {
var mx = new Matrix();
return this.transform(mx.translate.apply(mx, arguments));
},
/**
* The center of the visible area in project coordinates.
*
* @bean
* @type Point
*/
getCenter: function () {
return this.getBounds().getCenter();
},
setCenter: function (/* center */) {
var center = Point.read(arguments);
this.translate(this.getCenter().subtract(center));
},
/**
* The view's zoom factor by which the project coordinates are magnified.
*
* @bean
* @type Number
* @see #scaling
*/
getZoom: function () {
var scaling = this._decompose().scaling;
// Use average since it can be non-uniform.
return (scaling.x + scaling.y) / 2;
},
setZoom: function (zoom) {
this.transform(new Matrix().scale(zoom / this.getZoom(), this.getCenter()));
},
/**
* The current rotation angle of the view, as described by its
* {@link #matrix}.
*
* @bean
* @type Number
*/
getRotation: function () {
return this._decompose().rotation;
},
setRotation: function (rotation) {
var current = this.getRotation();
if (current != null && rotation != null) {
this.rotate(rotation - current);
}
},
/**
* The current scale factor of the view, as described by its
* {@link #matrix}.
*
* @bean
* @type Point
* @see #zoom
*/
getScaling: function () {
var scaling = this._decompose().scaling;
return new LinkedPoint(scaling.x, scaling.y, this, 'setScaling');
},
setScaling: function (/* scaling */) {
var current = this.getScaling(),
// Clone existing points since we're caching internally.
scaling = Point.read(arguments, 0, { clone: true, readNull: true });
if (current && scaling) {
this.scale(scaling.x / current.x, scaling.y / current.y);
}
},
/**
* The view's transformation matrix, defining the view onto the project's
* contents (position, zoom level, rotation, etc).
*
* @bean
* @type Matrix
*/
getMatrix: function () {
return this._matrix;
},
setMatrix: function () {
// Use Matrix#initialize to easily copy over values.
// NOTE: calling initialize() also calls #_changed() for us, through its
// call to #set() / #reset(), and this also handles _applyMatrix for us.
var matrix = this._matrix;
matrix.set.apply(matrix, arguments);
},
/**
* Rotates the view by a given angle around the given center point.
*
* Angles are oriented clockwise and measured in degrees.
*
* @name View#rotate
* @function
* @param {Number} angle the rotation angle
* @param {Point} [center={@link View#center}]
* @see Matrix#rotate(angle[, center])
*/
/**
* Scales the view by the given value from its center point, or optionally
* from a supplied point.
*
* @name View#scale
* @function
* @param {Number} scale the scale factor
* @param {Point} [center={@link View#center}]
*/
/**
* Scales the view by the given values from its center point, or optionally
* from a supplied point.
*
* @name View#scale
* @function
* @param {Number} hor the horizontal scale factor
* @param {Number} ver the vertical scale factor
* @param {Point} [center={@link View#center}]
*/
/**
* Shears the view by the given value from its center point, or optionally
* by a supplied point.
*
* @name View#shear
* @function
* @param {Point} shear the horizontal and vertical shear factors as a point
* @param {Point} [center={@link View#center}]
* @see Matrix#shear(shear[, center])
*/
/**
* Shears the view by the given values from its center point, or optionally
* by a supplied point.
*
* @name View#shear
* @function
* @param {Number} hor the horizontal shear factor
* @param {Number} ver the vertical shear factor
* @param {Point} [center={@link View#center}]
* @see Matrix#shear(hor, ver[, center])
*/
/**
* Skews the view by the given angles from its center point, or optionally
* by a supplied point.
*
* @name View#skew
* @function
* @param {Point} skew the horizontal and vertical skew angles in degrees
* @param {Point} [center={@link View#center}]
* @see Matrix#shear(skew[, center])
*/
/**
* Skews the view by the given angles from its center point, or optionally
* by a supplied point.
*
* @name View#skew
* @function
* @param {Number} hor the horizontal skew angle in degrees
* @param {Number} ver the vertical sskew angle in degrees
* @param {Point} [center={@link View#center}]
* @see Matrix#shear(hor, ver[, center])
*/
/**
* Transform the view.
*
* @param {Matrix} matrix the matrix by which the view shall be transformed
*/
transform: function (matrix) {
this._matrix.append(matrix);
},
/**
* Scrolls the view by the given vector.
*
* @param {Point} point
* @deprecated use {@link #translate(delta)} instead (using opposite
* direction).
*/
scrollBy: function (/* point */) {
this.translate(Point.read(arguments).negate());
},
}
),
/** @lends View# */ {
// TODO: getInvalidBounds
// TODO: invalidate(rect)
// TODO: style: artwork / preview / raster / opaque / ink
// TODO: getShowGrid
// TODO: getMousePoint
// TODO: projectToView(rect)
/**
* Converts the passed point from project coordinate space to view
* coordinate space, which is measured in browser pixels in relation to the
* position of the view element.
*
* @param {Point} point the point in project coordinates to be converted
* @return {Point} the point converted into view coordinates
*/
projectToView: function (/* point */) {
return this._matrix._transformPoint(Point.read(arguments));
},
/**
* Converts the passed point from view coordinate space to project
* coordinate space.
*
* @param {Point} point the point in view coordinates to be converted
* @return {Point} the point converted into project coordinates
*/
viewToProject: function (/* point */) {
return this._matrix._inverseTransform(Point.read(arguments));
},
/**
* Determines and returns the event location in project coordinate space.
*
* @param {Event} event the native event object for which to determine the
* location.
* @return {Point} the event point in project coordinates.
*/
getEventPoint: function (event) {
return this.viewToProject(DomEvent.getOffset(event, this._element));
},
/**
* {@grouptitle Event Handlers}
* Handler function to be called on each frame of an animation.
* The function receives an event object which contains information about
* the frame event:
*
* @option event.count {Number} the number of times the frame event was
* fired
* @option event.time {Number} the total amount of time passed since the
* first frame event in seconds
* @option event.delta {Number} the time passed in seconds since the last
* frame event
*
* @name View#onFrame
* @property
* @type ?Function
* @see Item#onFrame
*
* @example {@paperscript}
* // Creating an animation:
*
* // Create a rectangle shaped path with its top left point at:
* // {x: 50, y: 25} and a size of {width: 50, height: 50}
* var path = new Path.Rectangle(new Point(50, 25), new Size(50, 50));
* path.fillColor = 'black';
*
* view.onFrame = function(event) {
* // Every frame, rotate the path by 3 degrees:
* path.rotate(3);
* }
*/
/**
* Handler function that is called whenever a view is resized.
*
* @name View#onResize
* @property
* @type ?Function
*
* @example
* // Repositioning items when a view is resized:
*
* // Create a circle shaped path in the center of the view:
* var path = new Path.Circle(view.bounds.center, 30);
* path.fillColor = 'red';
*
* view.onResize = function(event) {
* // Whenever the view is resized, move the path to its center:
* path.position = view.center;
* }
*/
/**
* The function to be called when the mouse button is pushed down on the
* view. The function receives a {@link MouseEvent} object which contains
* information about the mouse event.
* Note that such mouse events bubble up the scene graph hierarchy, reaching
* the view at the end, unless they are stopped before with {@link
* Event#stopPropagation()} or by returning `false` from a handler.
*
* @name View#onMouseDown
* @property
* @type ?Function
* @see Item#onMouseDown
*/
/**
* The function to be called when the mouse position changes while the mouse
* is being dragged over the view. The function receives a {@link
* MouseEvent} object which contains information about the mouse event.
* Note that such mouse events bubble up the scene graph hierarchy, reaching
* the view at the end, unless they are stopped before with {@link
* Event#stopPropagation()} or by returning `false` from a handler.
*
* @name View#onMouseDrag
* @property
* @type ?Function
* @see Item#onMouseDrag
*/
/**
* The function to be called when the mouse button is released over the item.
* The function receives a {@link MouseEvent} object which contains
* information about the mouse event.
*
* @name View#onMouseUp
* @property
* @type ?Function
* @see Item#onMouseUp
*/
/**
* The function to be called when the mouse clicks on the view. The function
* receives a {@link MouseEvent} object which contains information about the
* mouse event.
* Note that such mouse events bubble up the scene graph hierarchy, reaching
* the view at the end, unless they are stopped before with {@link
* Event#stopPropagation()} or by returning `false` from a handler.
*
* @name View#onClick
* @property
* @type ?Function
* @see Item#onClick
*/
/**
* The function to be called when the mouse double clicks on the view. The
* function receives a {@link MouseEvent} object which contains information
* about the mouse event.
* Note that such mouse events bubble up the scene graph hierarchy, reaching
* the view at the end, unless they are stopped before with {@link
* Event#stopPropagation()} or by returning `false` from a handler.
*
* @name View#onDoubleClick
* @property
* @type ?Function
* @see Item#onDoubleClick
*/
/**
* The function to be called repeatedly while the mouse moves over the
* view. The function receives a {@link MouseEvent} object which contains
* information about the mouse event.
* Note that such mouse events bubble up the scene graph hierarchy, reaching
* the view at the end, unless they are stopped before with {@link
* Event#stopPropagation()} or by returning `false` from a handler.
*
* @name View#onMouseMove
* @property
* @type ?Function
* @see Item#onMouseMove
*/
/**
* The function to be called when the mouse moves over the view. This
* function will only be called again, once the mouse moved outside of the
* view first. The function receives a {@link MouseEvent} object which
* contains information about the mouse event.
* Note that such mouse events bubble up the scene graph hierarchy, reaching
* the view at the end, unless they are stopped before with {@link
* Event#stopPropagation()} or by returning `false` from a handler.
*
* @name View#onMouseEnter
* @property
* @type ?Function
* @see Item#onMouseEnter
*/
/**
* The function to be called when the mouse moves out of the view.
* The function receives a {@link MouseEvent} object which contains
* information about the mouse event.
* Note that such mouse events bubble up the scene graph hierarchy, reaching
* the view at the end, unless they are stopped before with {@link
* Event#stopPropagation()} or by returning `false` from a handler.
*
* @name View#onMouseLeave
* @property
* @type ?Function
* @see View#onMouseLeave
*/
/**
* {@grouptitle Event Handling}
*
* Attach an event handler to the view.
*
* @name View#on
* @function
* @param {String} type the type of event: {@values 'frame', 'resize',
* 'mousedown', 'mouseup', 'mousedrag', 'click', 'doubleclick',
* 'mousemove', 'mouseenter', 'mouseleave'}
* @param {Function} function the function to be called when the event
* occurs, receiving a {@link MouseEvent} or {@link Event} object as its
* sole argument
* @return {View} this view itself, so calls can be chained
*
* @example {@paperscript}
* // Create a rectangle shaped path with its top left point at:
* // {x: 50, y: 25} and a size of {width: 50, height: 50}
* var path = new Path.Rectangle(new Point(50, 25), new Size(50, 50));
* path.fillColor = 'black';
*
* var frameHandler = function(event) {
* // Every frame, rotate the path by 3 degrees:
* path.rotate(3);
* };
*
* view.on('frame', frameHandler);
*/
/**
* Attach one or more event handlers to the view.
*
* @name View#on
* @function
* @param {Object} param an object literal containing one or more of the
* following properties: {@values frame, resize}
* @return {View} this view itself, so calls can be chained
*
* @example {@paperscript}
* // Create a rectangle shaped path with its top left point at:
* // {x: 50, y: 25} and a size of {width: 50, height: 50}
* var path = new Path.Rectangle(new Point(50, 25), new Size(50, 50));
* path.fillColor = 'black';
*
* var frameHandler = function(event) {
* // Every frame, rotate the path by 3 degrees:
* path.rotate(3);
* };
*
* view.on({
* frame: frameHandler
* });
*/
/**
* Detach an event handler from the view.
*
* @name View#off
* @function
* @param {String} type the event type: {@values 'frame', 'resize',
* 'mousedown', 'mouseup', 'mousedrag', 'click', 'doubleclick',
* 'mousemove', 'mouseenter', 'mouseleave'}
* @param {Function} function the function to be detached
* @return {View} this view itself, so calls can be chained
*
* @example {@paperscript}
* // Create a rectangle shaped path with its top left point at:
* // {x: 50, y: 25} and a size of {width: 50, height: 50}
* var path = new Path.Rectangle(new Point(50, 25), new Size(50, 50));
* path.fillColor = 'black';
*
* var frameHandler = function(event) {
* // Every frame, rotate the path by 3 degrees:
* path.rotate(3);
* };
*
* view.on({
* frame: frameHandler
* });
*
* // When the user presses the mouse,
* // detach the frame handler from the view:
* function onMouseDown(event) {
* view.off('frame');
* }
*/
/**
* Detach one or more event handlers from the view.
*
* @name View#off
* @function
* @param {Object} param an object literal containing one or more of the
* following properties: {@values frame, resize}
* @return {View} this view itself, so calls can be chained
*/
/**
* Emit an event on the view.
*
* @name View#emit
* @function
* @param {String} type the event type: {@values 'frame', 'resize',
* 'mousedown', 'mouseup', 'mousedrag', 'click', 'doubleclick',
* 'mousemove', 'mouseenter', 'mouseleave'}
* @param {Object} event an object literal containing properties describing
* the event
* @return {Boolean} {@true if the event had listeners}
*/
/**
* Check if the view has one or more event handlers of the specified type.
*
* @name View#responds
* @function
* @param {String} type the event type: {@values 'frame', 'resize',
* 'mousedown', 'mouseup', 'mousedrag', 'click', 'doubleclick',
* 'mousemove', 'mouseenter', 'mouseleave'}
* @return {Boolean} {@true if the view has one or more event handlers of
* the specified type}
*/
},
{
statics: {
_views: [],
_viewsById: {},
_id: 0,
create: function (project, element) {
if (globalThis.document && typeof element === 'string') element = globalThis.document.getElementById(element);
// Factory to provide the right View subclass for a given element.
// Produces only CanvasView or View items (for workers) for now:
var ctor = globalThis.window ? ref.CanvasView : View;
return new ctor(project, element);
},
},
},
// @ts-expect-error = Only a void function can be called with the 'new' keyword
new (function () {
// Injection scope for event handling on the browser
if (!globalThis.window) return;
/**
* Native event handling, coordinate conversion, focus handling and
* delegation to view and tool objects.
*/
var prevFocus,
tempFocus,
dragging = false, // mousedown that started on a view.
mouseDown = false; // mousedown anywhere.
function getView(event) {
// Get the view from the current event target.
var target = DomEvent.getTarget(event);
// Some node do not have the getAttribute method, e.g. SVG nodes.
return target.getAttribute && View._viewsById[target.getAttribute('id')];
}
function updateFocus() {
var view = View._focused;
if (!view || !view.isVisible()) {
// Find the first visible view
for (var i = 0, l = View._views.length; i < l; i++) {
if ((view = View._views[i]).isVisible()) {
View._focused = tempFocus = view;
break;
}
}
}
}
function handleMouseMove(view, event, point) {
view._handleMouseEvent('mousemove', event, point);
}
// Touch handling inspired by Hammer.js
var navigator = globalThis.window.navigator,
mousedown,
mousemove,
mouseup;
// @ts-expect-error = Property 'pointerEnabled' does not exist on type 'Navigator'
if (navigator.pointerEnabled || navigator.msPointerEnabled) {
// HTML5 / MS pointer events
mousedown = 'pointerdown MSPointerDown';
mousemove = 'pointermove MSPointerMove';
mouseup = 'pointerup pointercancel MSPointerUp MSPointerCancel';
} else {
mousedown = 'touchstart';
mousemove = 'touchmove';
mouseup = 'touchend touchcancel';
// Do not add mouse events on mobile and tablet devices
if (
!(
'ontouchstart' in globalThis.window && navigator.userAgent.match(/mobile|tablet|ip(ad|hone|od)|android|silk/i)
)
) {
// For non pointer events browsers and mixed browsers, like chrome
// on Windows8 touch laptop.
mousedown += ' mousedown';
mousemove += ' mousemove';
mouseup += ' mouseup';
}
}
var viewEvents = {},
docEvents = {
// NOTE: mouseleave does not seem to work on document in IE:
mouseout: function (event) {
// When the moues leaves the document, fire one last mousemove
// event, to give items the change to receive a mouseleave, etc.
var view = View._focused,
target = DomEvent.getRelatedTarget(event);
if (view && (!target || target.nodeName === 'HTML')) {
// See #800 for this bizarre workaround for an issue of
// Chrome on Windows:
// TODO: Remove again after Dec 2016, once fixed in Chrome.
var offset = DomEvent.getOffset(event, view._element),
x = offset.x,
abs = Math.abs,
ax = abs(x),
max = 1 << 25,
diff = ax - max;
offset.x = abs(diff) < ax ? diff * (x < 0 ? -1 : 1) : x;
handleMouseMove(view, event, view.viewToProject(offset));
}
},
scroll: updateFocus,
};
// mousemove and mouseup events need to be installed on document, not the
// view element, since we want to catch the end of drag events even outside
// our view. Only the mousedown events are installed on the view, as defined
// by _viewEvents below.
viewEvents[mousedown] = function (event) {
// Get the view from the event, and store a reference to the view that
// should receive keyboard input.
var view = (View._focused = getView(event));
if (!dragging) {
dragging = true;
view._handleMouseEvent('mousedown', event);
}
};
docEvents[mousemove] = function (event) {
var view = View._focused;
if (!mouseDown) {
// See if we can get the view from the current event target, and
// handle the mouse move over it.
var target = getView(event);
if (target) {
if (view !== target) {
// Temporarily focus this view without making it sticky, so
// Key events are handled too during the mouse over.
// As we switch view, fire one last mousemove in the old
// view, to let items receive receive a mouseleave, etc.
// @ts-expect-error = Expected 3 arguments, but got 2
if (view) handleMouseMove(view, event);
if (!prevFocus) prevFocus = view;
view = View._focused = tempFocus = target;
}
} else if (tempFocus && tempFocus === view) {
// Clear temporary focus again and switch back to previous focus
// but only if it is still valid (still in the DOM).
if (prevFocus && !prevFocus.isInserted()) prevFocus = null;
view = View._focused = prevFocus;
prevFocus = null;
updateFocus();
}
}
// @ts-expect-error = Expected 3 arguments, but got 2
if (view) handleMouseMove(view, event);
};
docEvents[mousedown] = function () {
// In order to not switch views during scroll dragging on touch devices,
// we need to know if the mouse was clicked anywhere on the document
// (see docEvents[mousemove]) The rest happens in viewEvents[mousedown].
mouseDown = true;
};
docEvents[mouseup] = function (event) {
var view = View._focused;
if (view && dragging) view._handleMouseEvent('mouseup', event);
mouseDown = dragging = false;
};
DomEvent.add(globalThis.document, docEvents);
DomEvent.add(globalThis.window, {
load: updateFocus,
});
/**
* Higher level event handling, hit-testing, and emitting of normal mouse
* events along with "virtual" events such as mouseenter, mouseleave,
* mousedrag, click, doubleclick, on both the hit-test item and the view,
* with support for bubbling (event-propagation).
*/
var called = false,
prevented = false,
// Event fallbacks for "virutal" events, e.g. if an item doesn't respond
// to doubleclick, fall back to click:
fallbacks = {
doubleclick: 'click',
mousedrag: 'mousemove',
},
// Various variables required by #_handleMouseEvent()
wasInView = false,
overView,
downPoint,
lastPoint,
downItem,
overItem,
dragItem,
clickItem,
clickTime,
dblClick;
// Returns true if event was prevented, false otherwise.
function emitMouseEvent(obj, target, type, event, point, prevPoint, stopItem) {
var stopped = false,
mouseEvent;
// Returns true if the event was stopped, false otherwise.
function emit(obj, type) {
if (obj.responds(type)) {
// Only produce the event object if we really need it, and then
// reuse it if we're bubbling.
if (!mouseEvent) {
mouseEvent = new ref.MouseEvent(
type,
event,
point,
target || obj,
// Calculate delta if prevPoint was passed
prevPoint ? point.subtract(prevPoint) : null
);
}
if (obj.emit(type, mouseEvent)) {
called = true;
if (mouseEvent.prevented) prevented = true;
// Bail out if propagation is stopped
if (mouseEvent.stopped) return (stopped = true);
}
} else {
var fallback = fallbacks[type];
if (fallback) return emit(obj, fallback);
}
}
// Bubble up the parents and emit this event until we're told to stop.
while (obj && obj !== stopItem) {
if (emit(obj, type)) break;
obj = obj._parent;
}
return stopped;
}
// Returns true if event was stopped, false otherwise.
function emitMouseEvents(view, hitItem, type, event, point, prevPoint) {
// Before handling events, process removeOn() calls for cleanup.
// NOTE: As soon as there is one event handler receiving mousedrag
// events, non of the removeOnMove() items will be removed while the
// user is dragging.
view._project.removeOn(type);
// Set called and prevented to false, so they will reflect if the
// following calls to emitMouseEvent() have called a handler, and if
// and of the handlers called event.preventDefault()
prevented = called = false;
// First handle the drag-item and its parents, through bubbling.
return (
(dragItem &&
// @ts-expect-error = Expected 7 arguments, but got 6
emitMouseEvent(dragItem, null, type, event, point, prevPoint)) ||
// Next handle the hit-item, if it's different from the drag-item
// and not a descendant of it (in which case it would already have
// received an event in the call above). Translate mousedrag to
// mousemove, since drag is handled above.
(hitItem &&
hitItem !== dragItem &&
!hitItem.isDescendant(dragItem) &&
emitMouseEvent(
hitItem,
null,
type === 'mousedrag' ? 'mousemove' : type,
event,
point,
prevPoint,
dragItem
)) ||
// Lastly handle the mouse events on the view, if we're still here.
// @ts-expect-error = Expected 7 arguments, but got 6
emitMouseEvent(view, dragItem || hitItem || view, type, event, point, prevPoint)
);
}
/**
* Lookup defining which native events are required by which item events.
* Required by code that is counting the amount of required natives events.
* The mapping is native -> virtual.
*/
var itemEventsMap = {
mousedown: {
mousedown: 1,
mousedrag: 1,
click: 1,
doubleclick: 1,
},
mouseup: {
mouseup: 1,
mousedrag: 1,
click: 1,
doubleclick: 1,
},
mousemove: {
mousedrag: 1,
mousemove: 1,
mouseenter: 1,
mouseleave: 1,
},
};
return {
_viewEvents: viewEvents,
/**
* Private method to handle mouse events, and delegate to items and
* tools.
*/
_handleMouseEvent: function (type, event, point) {
var itemEvents = this._itemEvents,
// Look up hitItems, which tells us whether a given native mouse
// event requires an item hit-test or not, before changing type
// to the virtual value (e.g. mousemove -> mousedrag):
hitItems = itemEvents.native[type],
nativeMove = type === 'mousemove',
tool = this._scope.tool,
view = this;
function responds(type) {
return itemEvents.virtual[type] || view.responds(type) || (tool && tool.responds(type));
}
// If it's a native mousemove event but the mouse is down, and at
// least one of the events responds to mousedrag, convert to it.
// NOTE: emitMouseEvent(), as well as Tool#_handleMouseEvent() fall
// back to mousemove if the objects don't respond to mousedrag.
if (nativeMove && dragging && responds('mousedrag')) type = 'mousedrag';
if (!point) point = this.getEventPoint(event);
// Run the hit-test on items first, but only if we're required to do
// so for this given mouse event, see hitItems, #_countItemEvent():
var inView = this.getBounds().contains(point),
hit =
hitItems &&
inView &&
view._project.hitTest(point, {
tolerance: 0,
fill: true,
stroke: true,
}),
hitItem = (hit && hit.item) || null,
// Keep track if view event should be handled, so we can use it
// to decide if tool._handleMouseEvent() shall be called after.
handle = false,
mouse = {};
// Create a simple lookup object to quickly check for different
// mouse event types.
mouse[type.substr(5)] = true;
// Handle mouseenter / leave between items and views first.
if (hitItems && hitItem !== overItem) {
if (overItem) {
// @ts-expect-error = Expected 7 arguments, but got 5
emitMouseEvent(overItem, null, 'mouseleave', event, point);
}
if (hitItem) {
// @ts-expect-error = Expected 7 arguments, but got 5
emitMouseEvent(hitItem, null, 'mouseenter', event, point);
}
overItem = hitItem;
}
// Handle mouseenter / leave on the view.
// @ts-expect-error = The left-hand side of an arithmetic operation must be of type
if (wasInView ^ inView) {
// @ts-expect-error = Expected 7 arguments, but got 5
emitMouseEvent(this, null, inView ? 'mouseenter' : 'mouseleave', event, point);
overView = inView ? this : null;
handle = true; // To include the leaving move.
}
// Now handle the mousemove / mousedrag event.
// Always call the view's mouse handlers first, as required by
// CanvasView, and then handle the active tool after, if any.
// mousedrag is allowed to leave the view and still triggers events,
// but do not trigger two subsequent even with the same location.
// @ts-expect-error = Property 'drag' does not exist on type '{}
if ((inView || mouse.drag) && !point.equals(lastPoint)) {
// Handle mousemove even if this is not actually a mousemove
// event but the mouse has moved since the last event.
emitMouseEvents(this, hitItem, nativeMove ? type : 'mousemove', event, point, lastPoint);
handle = true;
}
wasInView = inView;
// Now handle mousedown / mouseup
// We emit mousedown only when in the view, and mouseup regardless,
// as long as the mousedown event was inside.
// @ts-expect-error = Property does not exist on type '{}
if ((mouse.down && inView) || (mouse.up && downPoint)) {
emitMouseEvents(this, hitItem, type, event, point, downPoint);
// @ts-expect-error = Property does not exist on type '{}
if (mouse.down) {
// See if we're clicking again on the same item, within the
// double-click time. Firefox uses 300ms as the max time
// difference:
dblClick = hitItem === clickItem && Date.now() - clickTime < 300;
downItem = clickItem = hitItem;
// Only start dragging if the mousedown event has not
// prevented the default, and if the hitItem or any of its
// parents actually respond to mousedrag events.
if (!prevented && hitItem) {
var item = hitItem;
while (item && !item.responds('mousedrag')) item = item._parent;
if (item) dragItem = hitItem;
}
downPoint = point;
// @ts-expect-error = Property does not exist on type '{}
} else if (mouse.up) {
// Emulate click / doubleclick, but only on the hit-item,
// not the view.
if (!prevented && hitItem === downItem) {
clickTime = Date.now();
emitMouseEvents(this, hitItem, dblClick ? 'doubleclick' : 'click', event, point, downPoint);
dblClick = false;
}
downItem = dragItem = null;
}
// Clear wasInView so we're not accidentally handling mousedrag
// events that started outside the view as mousemove events on
// the view (needed to handle touch scrolling correctly).
wasInView = false;
handle = true;
}
lastPoint = point;
// Now finally call the tool events, but filter mouse move events
// to only be fired if we're inside the view or if we just left it.
// Prevent default if at least one handler was called, and none of
// them enforces default, to prevent scrolling on touch devices.
if (handle && tool) {
called = tool._handleMouseEvent(type, event, point, mouse) || called;
}
// Now call `preventDefault()`, if any of these conditions are met:
// - If any of the handlers were called, except for mousemove events
// which can call `preventDefault()` explicitly or return `false`.
// - If this is a unhandled mousedown event, but the view or tools
// respond to mouseup.
//
// Some events are not cancelable anyway (like during a scroll
// inertia on mobile) so trying to prevent default in those case
// would result in no effect and an error.
if (
event.cancelable !== false &&
// @ts-expect-error = Property does not exist on type '{}
((called && !mouse.move) || (mouse.down && responds('mouseup')))
) {
event.preventDefault();
}
},
/**
* Private method to handle key events.
*/
_handleKeyEvent: function (type, event, key, character) {
var scope = this._scope,
tool = scope.tool,
keyEvent;
function emit(obj) {
if (obj.responds(type)) {
// Update global reference to this scope.
ref.paper = scope;
// Only produce the event object if we really need it.
obj.emit(type, (keyEvent = keyEvent || new ref.KeyEvent(type, event, key, character)));
}
}
if (this.isVisible()) {
// Call the onKeyDown or onKeyUp handler if present
emit(this);
if (tool && tool.responds(type)) emit(tool);
}
},
_countItemEvent: function (type, sign) {
// If the view requires counting of installed mouse events,
// change the event counters now according to itemEventsMap
// (defined in the code further above).
var itemEvents = this._itemEvents,
native = itemEvents.native,
virtual = itemEvents.virtual;
for (var key in itemEventsMap) {
native[key] = (native[key] || 0) + (itemEventsMap[key][type] || 0) * sign;
}
// Also update the count of virtual events installed.
virtual[type] = (virtual[type] || 0) + sign;
},
statics: {
/**
* Loops through all views and sets the focus on the first
* active one.
*/
updateFocus: updateFocus,
/**
* Clear all events handling state information. Made for testing
* purpose, to have a way to start with a fresh state before each
* test.
* @private
*/
_resetState: function () {
dragging = mouseDown = called = wasInView = false;
prevFocus =
tempFocus =
overView =
downPoint =
lastPoint =
downItem =
overItem =
dragItem =
clickItem =
clickTime =
dblClick =
null;
},
},
};
})()
);
ref.View = View;
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