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+// Copyright 2005 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 A patched, standardized event object for browser events.
+ *
+ * <pre>
+ * The patched event object contains the following members:
+ * - type {string} Event type, e.g. 'click'
+ * - target {Object} The element that actually triggered the event
+ * - currentTarget {Object} The element the listener is attached to
+ * - relatedTarget {Object} For mouseover and mouseout, the previous object
+ * - offsetX {number} X-coordinate relative to target
+ * - offsetY {number} Y-coordinate relative to target
+ * - clientX {number} X-coordinate relative to viewport
+ * - clientY {number} Y-coordinate relative to viewport
+ * - screenX {number} X-coordinate relative to the edge of the screen
+ * - screenY {number} Y-coordinate relative to the edge of the screen
+ * - button {number} Mouse button. Use isButton() to test.
+ * - keyCode {number} Key-code
+ * - ctrlKey {boolean} Was ctrl key depressed
+ * - altKey {boolean} Was alt key depressed
+ * - shiftKey {boolean} Was shift key depressed
+ * - metaKey {boolean} Was meta key depressed
+ * - defaultPrevented {boolean} Whether the default action has been prevented
+ * - state {Object} History state object
+ *
+ * NOTE: The keyCode member contains the raw browser keyCode. For normalized
+ * key and character code use {@link goog.events.KeyHandler}.
+ * </pre>
+ *
+ * @author arv@google.com (Erik Arvidsson)
+ */
+
+goog.provide('goog.events.BrowserEvent');
+goog.provide('goog.events.BrowserEvent.MouseButton');
+
+goog.require('goog.events.BrowserFeature');
+goog.require('goog.events.Event');
+goog.require('goog.events.EventType');
+goog.require('goog.reflect');
+goog.require('goog.userAgent');
+
+
+
+/**
+ * Accepts a browser event object and creates a patched, cross browser event
+ * object.
+ * The content of this object will not be initialized if no event object is
+ * provided. If this is the case, init() needs to be invoked separately.
+ * @param {Event=} opt_e Browser event object.
+ * @param {EventTarget=} opt_currentTarget Current target for event.
+ * @constructor
+ * @extends {goog.events.Event}
+ */
+goog.events.BrowserEvent = function(opt_e, opt_currentTarget) {
+ goog.events.BrowserEvent.base(this, 'constructor', opt_e ? opt_e.type : '');
+
+ /**
+ * Target that fired the event.
+ * @override
+ * @type {Node}
+ */
+ this.target = null;
+
+ /**
+ * Node that had the listener attached.
+ * @override
+ * @type {Node|undefined}
+ */
+ this.currentTarget = null;
+
+ /**
+ * For mouseover and mouseout events, the related object for the event.
+ * @type {Node}
+ */
+ this.relatedTarget = null;
+
+ /**
+ * X-coordinate relative to target.
+ * @type {number}
+ */
+ this.offsetX = 0;
+
+ /**
+ * Y-coordinate relative to target.
+ * @type {number}
+ */
+ this.offsetY = 0;
+
+ /**
+ * X-coordinate relative to the window.
+ * @type {number}
+ */
+ this.clientX = 0;
+
+ /**
+ * Y-coordinate relative to the window.
+ * @type {number}
+ */
+ this.clientY = 0;
+
+ /**
+ * X-coordinate relative to the monitor.
+ * @type {number}
+ */
+ this.screenX = 0;
+
+ /**
+ * Y-coordinate relative to the monitor.
+ * @type {number}
+ */
+ this.screenY = 0;
+
+ /**
+ * Which mouse button was pressed.
+ * @type {number}
+ */
+ this.button = 0;
+
+ /**
+ * Key of key press.
+ * @type {string}
+ */
+ this.key = '';
+
+ /**
+ * Keycode of key press.
+ * @type {number}
+ */
+ this.keyCode = 0;
+
+ /**
+ * Keycode of key press.
+ * @type {number}
+ */
+ this.charCode = 0;
+
+ /**
+ * Whether control was pressed at time of event.
+ * @type {boolean}
+ */
+ this.ctrlKey = false;
+
+ /**
+ * Whether alt was pressed at time of event.
+ * @type {boolean}
+ */
+ this.altKey = false;
+
+ /**
+ * Whether shift was pressed at time of event.
+ * @type {boolean}
+ */
+ this.shiftKey = false;
+
+ /**
+ * Whether the meta key was pressed at time of event.
+ * @type {boolean}
+ */
+ this.metaKey = false;
+
+ /**
+ * History state object, only set for PopState events where it's a copy of the
+ * state object provided to pushState or replaceState.
+ * @type {Object}
+ */
+ this.state = null;
+
+ /**
+ * Whether the default platform modifier key was pressed at time of event.
+ * (This is control for all platforms except Mac, where it's Meta.)
+ * @type {boolean}
+ */
+ this.platformModifierKey = false;
+
+ /**
+ * The browser event object.
+ * @private {Event}
+ */
+ this.event_ = null;
+
+ if (opt_e) {
+ this.init(opt_e, opt_currentTarget);
+ }
+};
+goog.inherits(goog.events.BrowserEvent, goog.events.Event);
+
+
+/**
+ * Normalized button constants for the mouse.
+ * @enum {number}
+ */
+goog.events.BrowserEvent.MouseButton = {
+ LEFT: 0,
+ MIDDLE: 1,
+ RIGHT: 2
+};
+
+
+/**
+ * Static data for mapping mouse buttons.
+ * @type {!Array<number>}
+ */
+goog.events.BrowserEvent.IEButtonMap = [
+ 1, // LEFT
+ 4, // MIDDLE
+ 2 // RIGHT
+];
+
+
+/**
+ * Accepts a browser event object and creates a patched, cross browser event
+ * object.
+ * @param {Event} e Browser event object.
+ * @param {EventTarget=} opt_currentTarget Current target for event.
+ */
+goog.events.BrowserEvent.prototype.init = function(e, opt_currentTarget) {
+ var type = this.type = e.type;
+
+ /**
+ * On touch devices use the first "changed touch" as the relevant touch.
+ * @type {Touch}
+ */
+ var relevantTouch = e.changedTouches ? e.changedTouches[0] : null;
+
+ // TODO(nicksantos): Change this.target to type EventTarget.
+ this.target = /** @type {Node} */ (e.target) || e.srcElement;
+
+ // TODO(nicksantos): Change this.currentTarget to type EventTarget.
+ this.currentTarget = /** @type {Node} */ (opt_currentTarget);
+
+ var relatedTarget = /** @type {Node} */ (e.relatedTarget);
+ if (relatedTarget) {
+ // There's a bug in FireFox where sometimes, relatedTarget will be a
+ // chrome element, and accessing any property of it will get a permission
+ // denied exception. See:
+ // https://bugzilla.mozilla.org/show_bug.cgi?id=497780
+ if (goog.userAgent.GECKO) {
+ if (!goog.reflect.canAccessProperty(relatedTarget, 'nodeName')) {
+ relatedTarget = null;
+ }
+ }
+ // TODO(arv): Use goog.events.EventType when it has been refactored into its
+ // own file.
+ } else if (type == goog.events.EventType.MOUSEOVER) {
+ relatedTarget = e.fromElement;
+ } else if (type == goog.events.EventType.MOUSEOUT) {
+ relatedTarget = e.toElement;
+ }
+
+ this.relatedTarget = relatedTarget;
+
+ if (!goog.isNull(relevantTouch)) {
+ this.clientX = relevantTouch.clientX !== undefined ? relevantTouch.clientX :
+ relevantTouch.pageX;
+ this.clientY = relevantTouch.clientY !== undefined ? relevantTouch.clientY :
+ relevantTouch.pageY;
+ this.screenX = relevantTouch.screenX || 0;
+ this.screenY = relevantTouch.screenY || 0;
+ } else {
+ // Webkit emits a lame warning whenever layerX/layerY is accessed.
+ // http://code.google.com/p/chromium/issues/detail?id=101733
+ this.offsetX = (goog.userAgent.WEBKIT || e.offsetX !== undefined) ?
+ e.offsetX :
+ e.layerX;
+ this.offsetY = (goog.userAgent.WEBKIT || e.offsetY !== undefined) ?
+ e.offsetY :
+ e.layerY;
+ this.clientX = e.clientX !== undefined ? e.clientX : e.pageX;
+ this.clientY = e.clientY !== undefined ? e.clientY : e.pageY;
+ this.screenX = e.screenX || 0;
+ this.screenY = e.screenY || 0;
+ }
+
+ this.button = e.button;
+
+ this.keyCode = e.keyCode || 0;
+ this.key = e.key || '';
+ this.charCode = e.charCode || (type == 'keypress' ? e.keyCode : 0);
+ this.ctrlKey = e.ctrlKey;
+ this.altKey = e.altKey;
+ this.shiftKey = e.shiftKey;
+ this.metaKey = e.metaKey;
+ this.platformModifierKey = goog.userAgent.MAC ? e.metaKey : e.ctrlKey;
+ this.state = e.state;
+ this.event_ = e;
+ if (e.defaultPrevented) {
+ this.preventDefault();
+ }
+};
+
+
+/**
+ * Tests to see which button was pressed during the event. This is really only
+ * useful in IE and Gecko browsers. And in IE, it's only useful for
+ * mousedown/mouseup events, because click only fires for the left mouse button.
+ *
+ * Safari 2 only reports the left button being clicked, and uses the value '1'
+ * instead of 0. Opera only reports a mousedown event for the middle button, and
+ * no mouse events for the right button. Opera has default behavior for left and
+ * middle click that can only be overridden via a configuration setting.
+ *
+ * There's a nice table of this mess at http://www.unixpapa.com/js/mouse.html.
+ *
+ * @param {goog.events.BrowserEvent.MouseButton} button The button
+ * to test for.
+ * @return {boolean} True if button was pressed.
+ */
+goog.events.BrowserEvent.prototype.isButton = function(button) {
+ if (!goog.events.BrowserFeature.HAS_W3C_BUTTON) {
+ if (this.type == 'click') {
+ return button == goog.events.BrowserEvent.MouseButton.LEFT;
+ } else {
+ return !!(
+ this.event_.button & goog.events.BrowserEvent.IEButtonMap[button]);
+ }
+ } else {
+ return this.event_.button == button;
+ }
+};
+
+
+/**
+ * Whether this has an "action"-producing mouse button.
+ *
+ * By definition, this includes left-click on windows/linux, and left-click
+ * without the ctrl key on Macs.
+ *
+ * @return {boolean} The result.
+ */
+goog.events.BrowserEvent.prototype.isMouseActionButton = function() {
+ // Webkit does not ctrl+click to be a right-click, so we
+ // normalize it to behave like Gecko and Opera.
+ return this.isButton(goog.events.BrowserEvent.MouseButton.LEFT) &&
+ !(goog.userAgent.WEBKIT && goog.userAgent.MAC && this.ctrlKey);
+};
+
+
+/**
+ * @override
+ */
+goog.events.BrowserEvent.prototype.stopPropagation = function() {
+ goog.events.BrowserEvent.superClass_.stopPropagation.call(this);
+ if (this.event_.stopPropagation) {
+ this.event_.stopPropagation();
+ } else {
+ this.event_.cancelBubble = true;
+ }
+};
+
+
+/**
+ * @override
+ */
+goog.events.BrowserEvent.prototype.preventDefault = function() {
+ goog.events.BrowserEvent.superClass_.preventDefault.call(this);
+ var be = this.event_;
+ if (!be.preventDefault) {
+ be.returnValue = false;
+ if (goog.events.BrowserFeature.SET_KEY_CODE_TO_PREVENT_DEFAULT) {
+
+ try {
+ // Most keys can be prevented using returnValue. Some special keys
+ // require setting the keyCode to -1 as well:
+ //
+ // In IE7:
+ // F3, F5, F10, F11, Ctrl+P, Crtl+O, Ctrl+F (these are taken from IE6)
+ //
+ // In IE8:
+ // Ctrl+P, Crtl+O, Ctrl+F (F1-F12 cannot be stopped through the event)
+ //
+ // We therefore do this for all function keys as well as when Ctrl key
+ // is pressed.
+ var VK_F1 = 112;
+ var VK_F12 = 123;
+ if (be.ctrlKey || be.keyCode >= VK_F1 && be.keyCode <= VK_F12) {
+ be.keyCode = -1;
+ }
+ } catch (ex) {
+ // IE throws an 'access denied' exception when trying to change
+ // keyCode in some situations (e.g. srcElement is input[type=file],
+ // or srcElement is an anchor tag rewritten by parent's innerHTML).
+ // Do nothing in this case.
+ }
+ }
+ } else {
+ be.preventDefault();
+ }
+};
+
+
+/**
+ * @return {Event} The underlying browser event object.
+ */
+goog.events.BrowserEvent.prototype.getBrowserEvent = function() {
+ return this.event_;
+};