QiHaiFengProgram/ckeditor/_source/core/event.js

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/*
Copyright (c) 2003-2012, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

/**
 * @fileOverview Defines the {@link CKEDITOR.event} class, which serves as the
 *		base for classes and objects that require event handling features.
 */

if ( !CKEDITOR.event )
{
	/**
	 * Creates an event class instance. This constructor is rearely used, being
	 * the {@link #.implementOn} function used in class prototypes directly
	 * instead.
	 * @class This is a base class for classes and objects that require event
	 * handling features.<br />
	 * <br />
	 * Do not confuse this class with {@link CKEDITOR.dom.event} which is
	 * instead used for DOM events. The CKEDITOR.event class implements the
	 * internal event system used by the CKEditor to fire API related events.
	 * @example
	 */
	CKEDITOR.event = function()
	{};

	/**
	 * Implements the {@link CKEDITOR.event} features in an object.
	 * @param {Object} targetObject The object into which implement the features.
	 * @example
	 * var myObject = { message : 'Example' };
	 * <b>CKEDITOR.event.implementOn( myObject }</b>;
	 * myObject.on( 'testEvent', function()
	 *     {
	 *         alert( this.message );  // "Example"
	 *     });
	 * myObject.fire( 'testEvent' );
	 */
	CKEDITOR.event.implementOn = function( targetObject )
	{
		var eventProto = CKEDITOR.event.prototype;

		for ( var prop in eventProto )
		{
			if ( targetObject[ prop ] == undefined )
				targetObject[ prop ] = eventProto[ prop ];
		}
	};

	CKEDITOR.event.prototype = (function()
	{
		// Returns the private events object for a given object.
		var getPrivate = function( obj )
		{
			var _ = ( obj.getPrivate && obj.getPrivate() ) || obj._ || ( obj._ = {} );
			return _.events || ( _.events = {} );
		};

		var eventEntry = function( eventName )