SalesSystemOnline/ckeditor_3.6/ckeditor/_source/plugins/undo/plugin.js

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/*
Copyright (c) 2003-2011, CKSource - Frederico Knabben. All rights reserved.
For licensing, see LICENSE.html or http://ckeditor.com/license
*/

/**
 * @fileOverview Undo/Redo system for saving shapshot for document modification
 *		and other recordable changes.
 */

(function()
{
	CKEDITOR.plugins.add( 'undo',
	{
		requires : [ 'selection', 'wysiwygarea' ],

		init : function( editor )
		{
			var undoManager = new UndoManager( editor );

			var undoCommand = editor.addCommand( 'undo',
				{
					exec : function()
					{
						if ( undoManager.undo() )
						{
							editor.selectionChange();
							this.fire( 'afterUndo' );
						}
					},
					state : CKEDITOR.TRISTATE_DISABLED,
					canUndo : false
				});

			var redoCommand = editor.addCommand( 'redo',
				{
					exec : function()
					{
						if ( undoManager.redo() )
						{
							editor.selectionChange();
							this.fire( 'afterRedo' );
						}
					},
					state : CKEDITOR.TRISTATE_DISABLED,
					canUndo : false
				});

			undoManager.onChange = function()
			{
				undoCommand.setState( undoManager.undoable() ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
				redoCommand.setState( undoManager.redoable() ? CKEDITOR.TRISTATE_OFF : CKEDITOR.TRISTATE_DISABLED );
			};

			function recordCommand( event )
			{
				// If the command hasn't been marked to not support undo.
				if ( undoManager.enabled && event.data.command.canUndo !== false )
					undoManager.save();
			}