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Unified Diff: chrome/browser/resources/shared/js/cr/event_target.js

Issue 11962043: Move webui resources from chrome\browser\resources\shared to ui\webui\resources. (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 7 years, 11 months ago
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Index: chrome/browser/resources/shared/js/cr/event_target.js
===================================================================
--- chrome/browser/resources/shared/js/cr/event_target.js (revision 177292)
+++ chrome/browser/resources/shared/js/cr/event_target.js (working copy)
@@ -1,104 +0,0 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-/**
- * @fileoverview This contains an implementation of the EventTarget interface
- * as defined by DOM Level 2 Events.
- */
-
-cr.define('cr', function() {
-
- /**
- * Creates a new EventTarget. This class implements the DOM level 2
- * EventTarget interface and can be used wherever those are used.
- * @constructor
- */
- function EventTarget() {
- }
-
- EventTarget.prototype = {
-
- /**
- * Adds an event listener to the target.
- * @param {string} type The name of the event.
- * @param {!Function|{handleEvent:Function}} handler The handler for the
- * event. This is called when the event is dispatched.
- */
- addEventListener: function(type, handler) {
- if (!this.listeners_)
- this.listeners_ = Object.create(null);
- if (!(type in this.listeners_)) {
- this.listeners_[type] = [handler];
- } else {
- var handlers = this.listeners_[type];
- if (handlers.indexOf(handler) < 0)
- handlers.push(handler);
- }
- },
-
- /**
- * Removes an event listener from the target.
- * @param {string} type The name of the event.
- * @param {!Function|{handleEvent:Function}} handler The handler for the
- * event.
- */
- removeEventListener: function(type, handler) {
- if (!this.listeners_)
- return;
- if (type in this.listeners_) {
- var handlers = this.listeners_[type];
- var index = handlers.indexOf(handler);
- if (index >= 0) {
- // Clean up if this was the last listener.
- if (handlers.length == 1)
- delete this.listeners_[type];
- else
- handlers.splice(index, 1);
- }
- }
- },
-
- /**
- * Dispatches an event and calls all the listeners that are listening to
- * the type of the event.
- * @param {!cr.event.Event} event The event to dispatch.
- * @return {boolean} Whether the default action was prevented. If someone
- * calls preventDefault on the event object then this returns false.
- */
- dispatchEvent: function(event) {
- if (!this.listeners_)
- return true;
-
- // Since we are using DOM Event objects we need to override some of the
- // properties and methods so that we can emulate this correctly.
- var self = this;
- event.__defineGetter__('target', function() {
- return self;
- });
- event.preventDefault = function() {
- this.returnValue = false;
- };
-
- var type = event.type;
- var prevented = 0;
- if (type in this.listeners_) {
- // Clone to prevent removal during dispatch
- var handlers = this.listeners_[type].concat();
- for (var i = 0, handler; handler = handlers[i]; i++) {
- if (handler.handleEvent)
- prevented |= handler.handleEvent.call(handler, event) === false;
- else
- prevented |= handler.call(this, event) === false;
- }
- }
-
- return !prevented && event.returnValue;
- }
- };
-
- // Export
- return {
- EventTarget: EventTarget
- };
-});
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