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Name File: fckevents.js

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/*
 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
 * Copyright (C) 2003-2007 Frederico Caldeira Knabben
 *
 * == BEGIN LICENSE ==
 *
 * Licensed under the terms of any of the following licenses at your
 * choice:
 *
 *  - GNU General Public License Version 2 or later (the "GPL")
 *    http://www.gnu.org/licenses/gpl.html
 *
 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
 *    http://www.gnu.org/licenses/lgpl.html
 *
 *  - Mozilla Public License Version 1.1 or later (the "MPL")
 *    http://www.mozilla.org/MPL/MPL-1.1.html
 *
 * == END LICENSE ==
 *
 * FCKEvents Class: used to handle events is a advanced way.
 */

var FCKEvents = function( eventsOwner )
{
	this.Owner = eventsOwner ;
	this._RegisteredEvents = new Object() ;
}

FCKEvents.prototype.AttachEvent = function( eventName, functionPointer )
{
	var aTargets ;

	if ( !( aTargets = this._RegisteredEvents[ eventName ] ) )
		this._RegisteredEvents[ eventName ] = [ functionPointer ] ;
	else
	{
		// Check that the event handler isn't already registered with the same listener
		// It doesn't detect function pointers belonging to an object (at least in Gecko)
		if ( aTargets.IndexOf( functionPointer ) == -1 )
			aTargets.push( functionPointer ) ;
	}
}

FCKEvents.prototype.FireEvent = function( eventName, params )
{
	var bReturnValue = true ;

	var oCalls = this._RegisteredEvents[ eventName ] ;

	if ( oCalls )
	{
		for ( var i = 0 ; i < oCalls.length ; i++ )
		{
			try
			{
				bReturnValue = ( oCalls[ i ]( this.Owner, params ) && bReturnValue ) ;
			}
			catch(e)
			{
				// Ignore the following error. It may happen if pointing to a
				// script not anymore available (#934):
				// -2146823277 = Can't execute code from a freed script
				if ( e.number != -2146823277 )
					throw e ;
			}
		}
	}

	return bReturnValue ;
}