// Copyright 2006 The Closure Library Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS-IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
/**
* @fileoverview Drag Utilities.
*
* Provides extensible functionality for drag & drop behaviour.
*
* @see ../demos/drag.html
* @see ../demos/dragger.html
*/
goog.provide('goog.fx.DragEvent');
goog.provide('goog.fx.Dragger');
goog.provide('goog.fx.Dragger.EventType');
goog.require('goog.dom');
goog.require('goog.dom.TagName');
goog.require('goog.events');
goog.require('goog.events.Event');
goog.require('goog.events.EventHandler');
goog.require('goog.events.EventTarget');
goog.require('goog.events.EventType');
goog.require('goog.math.Coordinate');
goog.require('goog.math.Rect');
goog.require('goog.style');
goog.require('goog.style.bidi');
goog.require('goog.userAgent');
/**
* A class that allows mouse or touch-based dragging (moving) of an element
*
* @param {Element} target The element that will be dragged.
* @param {Element=} opt_handle An optional handle to control the drag, if null
* the target is used.
* @param {goog.math.Rect=} opt_limits Object containing left, top, width,
* and height.
*
* @extends {goog.events.EventTarget}
* @constructor
* @struct
*/
goog.fx.Dragger = function(target, opt_handle, opt_limits) {
goog.fx.Dragger.base(this, 'constructor');
/**
* Reference to drag target element.
* @type {?Element}
*/
this.target = target;
/**
* Reference to the handler that initiates the drag.
* @type {?Element}
*/
this.handle = opt_handle || target;
/**
* Object representing the limits of the drag region.
* @type {goog.math.Rect}
*/
this.limits = opt_limits || new goog.math.Rect(NaN, NaN, NaN, NaN);
/**
* Reference to a document object to use for the events.
* @private {Document}
*/
this.document_ = goog.dom.getOwnerDocument(target);
/** @private {!goog.events.EventHandler} */
this.eventHandler_ = new goog.events.EventHandler(this);
this.registerDisposable(this.eventHandler_);
/**
* Whether the element is rendered right-to-left. We initialize this lazily.
* @private {boolean|undefined}}
*/
this.rightToLeft_;
/**
* Current x position of mouse or touch relative to viewport.
* @type {number}
*/
this.clientX = 0;
/**
* Current y position of mouse or touch relative to viewport.
* @type {number}
*/
this.clientY = 0;
/**
* Current x position of mouse or touch relative to screen. Deprecated because
* it doesn't take into affect zoom level or pixel density.
* @type {number}
* @deprecated Consider switching to clientX instead.
*/
this.screenX = 0;
/**
* Current y position of mouse or touch relative to screen. Deprecated because
* it doesn't take into affect zoom level or pixel density.
* @type {number}
* @deprecated Consider switching to clientY instead.
*/
this.screenY = 0;
/**
* The x position where the first mousedown or touchstart occurred.
* @type {number}
*/
this.startX = 0;
/**
* The y position where the first mousedown or touchstart occurred.
* @type {number}
*/
this.startY = 0;
/**
* Current x position of drag relative to target's parent.
* @type {number}
*/
this.deltaX = 0;
/**
* Current y position of drag relative to target's parent.
* @type {number}
*/
this.deltaY = 0;
/**
* The current page scroll value.
* @type {?goog.math.Coordinate}
*/
this.pageScroll;
/**
* Whether dragging is currently enabled.
* @private {boolean}
*/
this.enabled_ = true;
/**
* Whether object is currently being dragged.
* @private {boolean}
*/
this.dragging_ = false;
/**
* Whether mousedown should be default prevented.
* @private {boolean}
**/
this.preventMouseDown_ = true;
/**
* The amount of distance, in pixels, after which a mousedown or touchstart is
* considered a drag.
* @private {number}
*/
this.hysteresisDistanceSquared_ = 0;
/**
* Timestamp of when the mousedown or touchstart occurred.
* @private {number}
*/
this.mouseDownTime_ = 0;
/**
* The SCROLL event target used to make drag element follow scrolling.
* @private {?EventTarget}
*/
this.scrollTarget_;
/**
* Whether IE drag events cancelling is on.
* @private {boolean}
*/
this.ieDragStartCancellingOn_ = false;
/**
* Whether the dragger implements the changes described in http://b/6324964,
* making it truly RTL. This is a temporary flag to allow clients to
* transition to the new behavior at their convenience. At some point it will
* be the default.
* @private {boolean}
*/
this.useRightPositioningForRtl_ = false;
// Add listener. Do not use the event handler here since the event handler is
// used for listeners added and removed during the drag operation.
goog.events.listen(this.handle,
[goog.events.EventType.TOUCHSTART, goog.events.EventType.MOUSEDOWN],
this.startDrag, false, this);
};
goog.inherits(goog.fx.Dragger, goog.events.EventTarget);
// Dragger is meant to be extended, but defines most properties on its
// prototype, thus making it unsuitable for sealing.
goog.tagUnsealableClass(goog.fx.Dragger);
/**
* Whether setCapture is supported by the browser.
* @type {boolean}
* @private
*/
goog.fx.Dragger.HAS_SET_CAPTURE_ =
// IE and Gecko after 1.9.3 has setCapture
// WebKit does not yet: https://bugs.webkit.org/show_bug.cgi?id=27330
goog.userAgent.IE ||
goog.userAgent.GECKO && goog.userAgent.isVersionOrHigher('1.9.3');
/**
* Creates copy of node being dragged. This is a utility function to be used
* wherever it is inappropriate for the original source to follow the mouse
* cursor itself.
*
* @param {Element} sourceEl Element to copy.
* @return {!Element} The clone of {@code sourceEl}.
*/
goog.fx.Dragger.cloneNode = function(sourceEl) {
var clonedEl = /** @type {Element} */ (sourceEl.cloneNode(true)),
origTexts = sourceEl.getElementsByTagName(goog.dom.TagName.TEXTAREA),
dragTexts = clonedEl.getElementsByTagName(goog.dom.TagName.TEXTAREA);
// Cloning does not copy the current value of textarea elements, so correct
// this manually.
for (var i = 0; i < origTexts.length; i++) {
dragTexts[i].value = origTexts[i].value;
}
switch (sourceEl.tagName) {
case goog.dom.TagName.TR:
return goog.dom.createDom(goog.dom.TagName.TABLE, null,
goog.dom.createDom(goog.dom.TagName.TBODY,
null, clonedEl));
case goog.dom.TagName.TD:
case goog.dom.TagName.TH:
return goog.dom.createDom(
goog.dom.TagName.TABLE, null, goog.dom.createDom(
goog.dom.TagName.TBODY, null, goog.dom.createDom(
goog.dom.TagName.TR, null, clonedEl)));
case goog.dom.TagName.TEXTAREA:
clonedEl.value = sourceEl.value;
default:
return clonedEl;
}
};
/**
* Constants for event names.
* @enum {string}
*/
goog.fx.Dragger.EventType = {
// The drag action was canceled before the START event. Possible reasons:
// disabled dragger, dragging with the right mouse button or releasing the
// button before reaching the hysteresis distance.
EARLY_CANCEL: 'earlycancel',
START: 'start',
BEFOREDRAG: 'beforedrag',
DRAG: 'drag',
END: 'end'
};
/**
* Turns on/off true RTL behavior. This should be called immediately after
* construction. This is a temporary flag to allow clients to transition
* to the new component at their convenience. At some point true will be the
* default.
* @param {boolean} useRightPositioningForRtl True if "right" should be used for
* positioning, false if "left" should be used for positioning.
*/
goog.fx.Dragger.prototype.enableRightPositioningForRtl =
function(useRightPositioningForRtl) {
this.useRightPositioningForRtl_ = useRightPositioningForRtl;
};
/**
* Returns the event handler, intended for subclass use.
* @return {!goog.events.EventHandler<T>} The event handler.
* @this {T}
* @template T
*/
goog.fx.Dragger.prototype.getHandler = function() {
// TODO(user): templated "this" values currently result in "this" being
// "unknown" in the body of the function.
var self = /** @type {goog.fx.Dragger} */ (this);
return self.eventHandler_;
};
/**
* Sets (or reset) the Drag limits after a Dragger is created.
* @param {goog.math.Rect?} limits Object containing left, top, width,
* height for new Dragger limits. If target is right-to-left and
* enableRightPositioningForRtl(true) is called, then rect is interpreted as
* right, top, width, and height.
*/
goog.fx.Dragger.prototype.setLimits = function(limits) {
this.limits = limits || new goog.math.Rect(NaN, NaN, NaN, NaN);
};
/**
* Sets the distance the user has to drag the element before a drag operation is
* started.
* @param {number} distance The number of pixels after which a mousedown and
* move is considered a drag.
*/
goog.fx.Dragger.prototype.setHysteresis = function(distance) {
this.hysteresisDistanceSquared_ = Math.pow(distance, 2);
};
/**
* Gets the distance the user has to drag the element before a drag operation is
* started.
* @return {number} distance The number of pixels after which a mousedown and
* move is considered a drag.
*/
goog.fx.Dragger.prototype.getHysteresis = function() {
return Math.sqrt(this.hysteresisDistanceSquared_);
};
/**
* Sets the SCROLL event target to make drag element follow scrolling.
*
* @param {EventTarget} scrollTarget The event target that dispatches SCROLL
* events.
*/
goog.fx.Dragger.prototype.setScrollTarget = function(scrollTarget) {
this.scrollTarget_ = scrollTarget;
};
/**
* Enables cancelling of built-in IE drag events.
* @param {boolean} cancelIeDragStart Whether to enable cancelling of IE
* dragstart event.
*/
goog.fx.Dragger.prototype.setCancelIeDragStart = function(cancelIeDragStart) {
this.ieDragStartCancellingOn_ = cancelIeDragStart;
};
/**
* @return {boolean} Whether the dragger is enabled.
*/
goog.fx.Dragger.prototype.getEnabled = function() {
return this.enabled_;
};
/**
* Set whether dragger is enabled
* @param {boolean} enabled Whether dragger is enabled.
*/
goog.fx.Dragger.prototype.setEnabled = function(enabled) {
this.enabled_ = enabled;
};
/**
* Set whether mousedown should be default prevented.
* @param {boolean} preventMouseDown Whether mousedown should be default
* prevented.
*/
goog.fx.Dragger.prototype.setPreventMouseDown = function(preventMouseDown) {
this.preventMouseDown_ = preventMouseDown;
};
/** @override */
goog.fx.Dragger.prototype.disposeInternal = function() {
goog.fx.Dragger.superClass_.disposeInternal.call(this);
goog.events.unlisten(this.handle,
[goog.events.EventType.TOUCHSTART, goog.events.EventType.MOUSEDOWN],
this.startDrag, false, this);
this.cleanUpAfterDragging_();
this.target = null;
this.handle = null;
};
/**
* Whether the DOM element being manipulated is rendered right-to-left.
* @return {boolean} True if the DOM element is rendered right-to-left, false
* otherwise.
* @private
*/
goog.fx.Dragger.prototype.isRightToLeft_ = function() {
if (!goog.isDef(this.rightToLeft_)) {
this.rightToLeft_ = goog.style.isRightToLeft(this.target);
}
return this.rightToLeft_;
};
/**
* Event handler that is used to start the drag
* @param {goog.events.BrowserEvent} e Event object.
*/
goog.fx.Dragger.prototype.startDrag = function(e) {
var isMouseDown = e.type == goog.events.EventType.MOUSEDOWN;
// Dragger.startDrag() can be called by AbstractDragDrop with a mousemove
// event and IE does not report pressed mouse buttons on mousemove. Also,
// it does not make sense to check for the button if the user is already
// dragging.
if (this.enabled_ && !this.dragging_ &&
(!isMouseDown || e.isMouseActionButton())) {
this.maybeReinitTouchEvent_(e);
if (this.hysteresisDistanceSquared_ == 0) {
if (this.fireDragStart_(e)) {
this.dragging_ = true;
if (this.preventMouseDown_) {
e.preventDefault();
}
} else {
// If the start drag is cancelled, don't setup for a drag.
return;
}
} else if (this.preventMouseDown_) {
// Need to preventDefault for hysteresis to prevent page getting selected.
e.preventDefault();
}
this.setupDragHandlers();
this.clientX = this.startX = e.clientX;
this.clientY = this.startY = e.clientY;
this.screenX = e.screenX;
this.screenY = e.screenY;
this.computeInitialPosition();
this.pageScroll = goog.dom.getDomHelper(this.document_).getDocumentScroll();
this.mouseDownTime_ = goog.now();
} else {
this.dispatchEvent(goog.fx.Dragger.EventType.EARLY_CANCEL);
}
};
/**
* Sets up event handlers when dragging starts.
* @protected
*/
goog.fx.Dragger.prototype.setupDragHandlers = function() {
var doc = this.document_;
var docEl = doc.documentElement;
// Use bubbling when we have setCapture since we got reports that IE has
// problems with the capturing events in combination with setCapture.
var useCapture = !goog.fx.Dragger.HAS_SET_CAPTURE_;
this.eventHandler_.listen(doc,
[goog.events.EventType.TOUCHMOVE, goog.events.EventType.MOUSEMOVE],
this.handleMove_, useCapture);
this.eventHandler_.listen(doc,
[goog.events.EventType.TOUCHEND, goog.events.EventType.MOUSEUP],
this.endDrag, useCapture);
if (goog.fx.Dragger.HAS_SET_CAPTURE_) {
docEl.setCapture(false);
this.eventHandler_.listen(docEl,
goog.events.EventType.LOSECAPTURE,
this.endDrag);
} else {
// Make sure we stop the dragging if the window loses focus.
// Don't use capture in this listener because we only want to end the drag
// if the actual window loses focus. Since blur events do not bubble we use
// a bubbling listener on the window.
this.eventHandler_.listen(goog.dom.getWindow(doc),
goog.events.EventType.BLUR,
this.endDrag);
}
if (goog.userAgent.IE && this.ieDragStartCancellingOn_) {
// Cancel IE's 'ondragstart' event.
this.eventHandler_.listen(doc, goog.events.EventType.DRAGSTART,
goog.events.Event.preventDefault);
}
if (this.scrollTarget_) {
this.eventHandler_.listen(this.scrollTarget_, goog.events.EventType.SCROLL,
this.onScroll_, useCapture);
}
};
/**
* Fires a goog.fx.Dragger.EventType.START event.
* @param {goog.events.BrowserEvent} e Browser event that triggered the drag.
* @return {boolean} False iff preventDefault was called on the DragEvent.
* @private
*/
goog.fx.Dragger.prototype.fireDragStart_ = function(e) {
return this.dispatchEvent(new goog.fx.DragEvent(
goog.fx.Dragger.EventType.START, this, e.clientX, e.clientY, e));
};
/**
* Unregisters the event handlers that are only active during dragging, and
* releases mouse capture.
* @private
*/
goog.fx.Dragger.prototype.cleanUpAfterDragging_ = function() {
this.eventHandler_.removeAll();
if (goog.fx.Dragger.HAS_SET_CAPTURE_) {
this.document_.releaseCapture();
}
};
/**
* Event handler that is used to end the drag.
* @param {goog.events.BrowserEvent} e Event object.
* @param {boolean=} opt_dragCanceled Whether the drag has been canceled.
*/
goog.fx.Dragger.prototype.endDrag = function(e, opt_dragCanceled) {
this.cleanUpAfterDragging_();
if (this.dragging_) {
this.maybeReinitTouchEvent_(e);
this.dragging_ = false;
var x = this.limitX(this.deltaX);
var y = this.limitY(this.deltaY);
var dragCanceled = opt_dragCanceled ||
e.type == goog.events.EventType.TOUCHCANCEL;
this.dispatchEvent(new goog.fx.DragEvent(
goog.fx.Dragger.EventType.END, this, e.clientX, e.clientY, e, x, y,
dragCanceled));
} else {
this.dispatchEvent(goog.fx.Dragger.EventType.EARLY_CANCEL);
}
};
/**
* Event handler that is used to end the drag by cancelling it.
* @param {goog.events.BrowserEvent} e Event object.
*/
goog.fx.Dragger.prototype.endDragCancel = function(e) {
this.endDrag(e, true);
};
/**
* Re-initializes the event with the first target touch event or, in the case
* of a stop event, the last changed touch.
* @param {goog.events.BrowserEvent} e A TOUCH... event.
* @private
*/
goog.fx.Dragger.prototype.maybeReinitTouchEvent_ = function(e) {
var type = e.type;
if (type == goog.events.EventType.TOUCHSTART ||
type == goog.events.EventType.TOUCHMOVE) {
e.init(e.getBrowserEvent().targetTouches[0], e.currentTarget);
} else if (type == goog.events.EventType.TOUCHEND ||
type == goog.events.EventType.TOUCHCANCEL) {
e.init(e.getBrowserEvent().changedTouches[0], e.currentTarget);
}
};
/**
* Event handler that is used on mouse / touch move to update the drag
* @param {goog.events.BrowserEvent} e Event object.
* @private
*/
goog.fx.Dragger.prototype.handleMove_ = function(e) {
if (this.enabled_) {
this.maybeReinitTouchEvent_(e);
// dx in right-to-left cases is relative to the right.
var sign = this.useRightPositioningForRtl_ &&
this.isRightToLeft_() ? -1 : 1;
var dx = sign * (e.clientX - this.clientX);
var dy = e.clientY - this.clientY;
this.clientX = e.clientX;
this.clientY = e.clientY;
this.screenX = e.screenX;
this.screenY = e.screenY;
if (!this.dragging_) {
var diffX = this.startX - this.clientX;
var diffY = this.startY - this.clientY;
var distance = diffX * diffX + diffY * diffY;
if (distance > this.hysteresisDistanceSquared_) {
if (this.fireDragStart_(e)) {
this.dragging_ = true;
} else {
// DragListGroup disposes of the dragger if BEFOREDRAGSTART is
// canceled.
if (!this.isDisposed()) {
this.endDrag(e);
}
return;
}
}
}
var pos = this.calculatePosition_(dx, dy);
var x = pos.x;
var y = pos.y;
if (this.dragging_) {
var rv = this.dispatchEvent(new goog.fx.DragEvent(
goog.fx.Dragger.EventType.BEFOREDRAG, this, e.clientX, e.clientY,
e, x, y));
// Only do the defaultAction and dispatch drag event if predrag didn't
// prevent default
if (rv) {
this.doDrag(e, x, y, false);
e.preventDefault();
}
}
}
};
/**
* Calculates the drag position.
*
* @param {number} dx The horizontal movement delta.
* @param {number} dy The vertical movement delta.
* @return {!goog.math.Coordinate} The newly calculated drag element position.
* @private
*/
goog.fx.Dragger.prototype.calculatePosition_ = function(dx, dy) {
// Update the position for any change in body scrolling
var pageScroll = goog.dom.getDomHelper(this.document_).getDocumentScroll();
dx += pageScroll.x - this.pageScroll.x;
dy += pageScroll.y - this.pageScroll.y;
this.pageScroll = pageScroll;
this.deltaX += dx;
this.deltaY += dy;
var x = this.limitX(this.deltaX);
var y = this.limitY(this.deltaY);
return new goog.math.Coordinate(x, y);
};
/**
* Event handler for scroll target scrolling.
* @param {goog.events.BrowserEvent} e The event.
* @private
*/
goog.fx.Dragger.prototype.onScroll_ = function(e) {
var pos = this.calculatePosition_(0, 0);
e.clientX = this.clientX;
e.clientY = this.clientY;
this.doDrag(e, pos.x, pos.y, true);
};
/**
* @param {goog.events.BrowserEvent} e The closure object
* representing the browser event that caused a drag event.
* @param {number} x The new horizontal position for the drag element.
* @param {number} y The new vertical position for the drag element.
* @param {boolean} dragFromScroll Whether dragging was caused by scrolling
* the associated scroll target.
* @protected
*/
goog.fx.Dragger.prototype.doDrag = function(e, x, y, dragFromScroll) {
this.defaultAction(x, y);
this.dispatchEvent(new goog.fx.DragEvent(
goog.fx.Dragger.EventType.DRAG, this, e.clientX, e.clientY, e, x, y));
};
/**
* Returns the 'real' x after limits are applied (allows for some
* limits to be undefined).
* @param {number} x X-coordinate to limit.
* @return {number} The 'real' X-coordinate after limits are applied.
*/
goog.fx.Dragger.prototype.limitX = function(x) {
var rect = this.limits;
var left = !isNaN(rect.left) ? rect.left : null;
var width = !isNaN(rect.width) ? rect.width : 0;
var maxX = left != null ? left + width : Infinity;
var minX = left != null ? left : -Infinity;
return Math.min(maxX, Math.max(minX, x));
};
/**
* Returns the 'real' y after limits are applied (allows for some
* limits to be undefined).
* @param {number} y Y-coordinate to limit.
* @return {number} The 'real' Y-coordinate after limits are applied.
*/
goog.fx.Dragger.prototype.limitY = function(y) {
var rect = this.limits;
var top = !isNaN(rect.top) ? rect.top : null;
var height = !isNaN(rect.height) ? rect.height : 0;
var maxY = top != null ? top + height : Infinity;
var minY = top != null ? top : -Infinity;
return Math.min(maxY, Math.max(minY, y));
};
/**
* Overridable function for computing the initial position of the target
* before dragging begins.
* @protected
*/
goog.fx.Dragger.prototype.computeInitialPosition = function() {
this.deltaX = this.useRightPositioningForRtl_ ?
goog.style.bidi.getOffsetStart(this.target) :
/** @type {!HTMLElement} */ (this.target).offsetLeft;
this.deltaY = /** @type {!HTMLElement} */ (this.target).offsetTop;
};
/**
* Overridable function for handling the default action of the drag behaviour.
* Normally this is simply moving the element to x,y though in some cases it
* might be used to resize the layer. This is basically a shortcut to
* implementing a default ondrag event handler.
* @param {number} x X-coordinate for target element. In right-to-left, x this
* is the number of pixels the target should be moved to from the right.
* @param {number} y Y-coordinate for target element.
*/
goog.fx.Dragger.prototype.defaultAction = function(x, y) {
if (this.useRightPositioningForRtl_ && this.isRightToLeft_()) {
this.target.style.right = x + 'px';
} else {
this.target.style.left = x + 'px';
}
this.target.style.top = y + 'px';
};
/**
* @return {boolean} Whether the dragger is currently in the midst of a drag.
*/
goog.fx.Dragger.prototype.isDragging = function() {
return this.dragging_;
};
/**
* Object representing a drag event
* @param {string} type Event type.
* @param {goog.fx.Dragger} dragobj Drag object initiating event.
* @param {number} clientX X-coordinate relative to the viewport.
* @param {number} clientY Y-coordinate relative to the viewport.
* @param {goog.events.BrowserEvent} browserEvent The closure object
* representing the browser event that caused this drag event.
* @param {number=} opt_actX Optional actual x for drag if it has been limited.
* @param {number=} opt_actY Optional actual y for drag if it has been limited.
* @param {boolean=} opt_dragCanceled Whether the drag has been canceled.
* @constructor
* @struct
* @extends {goog.events.Event}
*/
goog.fx.DragEvent = function(type, dragobj, clientX, clientY, browserEvent,
opt_actX, opt_actY, opt_dragCanceled) {
goog.events.Event.call(this, type);
/**
* X-coordinate relative to the viewport
* @type {number}
*/
this.clientX = clientX;
/**
* Y-coordinate relative to the viewport
* @type {number}
*/
this.clientY = clientY;
/**
* The closure object representing the browser event that caused this drag
* event.
* @type {goog.events.BrowserEvent}
*/
this.browserEvent = browserEvent;
/**
* The real x-position of the drag if it has been limited
* @type {number}
*/
this.left = goog.isDef(opt_actX) ? opt_actX : dragobj.deltaX;
/**
* The real y-position of the drag if it has been limited
* @type {number}
*/
this.top = goog.isDef(opt_actY) ? opt_actY : dragobj.deltaY;
/**
* Reference to the drag object for this event
* @type {goog.fx.Dragger}
*/
this.dragger = dragobj;
/**
* Whether drag was canceled with this event. Used to differentiate between
* a legitimate drag END that can result in an action and a drag END which is
* a result of a drag cancelation. For now it can happen 1) with drag END
* event on FireFox when user drags the mouse out of the window, 2) with
* drag END event on IE7 which is generated on MOUSEMOVE event when user
* moves the mouse into the document after the mouse button has been
* released, 3) when TOUCHCANCEL is raised instead of TOUCHEND (on touch
* events).
* @type {boolean}
*/
this.dragCanceled = !!opt_dragCanceled;
};
goog.inherits(goog.fx.DragEvent, goog.events.Event);
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