FCKeditor/editor/_source/internals/fckundo_ie.js

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/*
 * FCKeditor - The text editor for internet
 * Copyright (C) 2003-2006 Frederico Caldeira Knabben
 * 
 * Licensed under the terms of the GNU Lesser General Public License:
 * 		http://www.opensource.org/licenses/lgpl-license.php
 * 
 * For further information visit:
 * 		http://www.fckeditor.net/
 * 
 * "Support Open Source software. What about a donation today?"
 * 
 * File Name: fckundo_ie.js
 * 	IE specific implementation for the Undo/Redo system.
 * 
 * File Authors:
 * 		Frederico Caldeira Knabben (fredck@fckeditor.net)
 */

var FCKUndo = new Object() ;

FCKUndo.SavedData = new Array() ;
FCKUndo.CurrentIndex = -1 ;
FCKUndo.TypesCount = FCKUndo.MaxTypes = 25 ;
FCKUndo.Typing = false ;

FCKUndo.SaveUndoStep = function()
{
	if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG )
		return ;

	// Shrink the array to the current level.
	FCKUndo.SavedData = FCKUndo.SavedData.slice( 0, FCKUndo.CurrentIndex + 1 ) ;

	// Get the Actual HTML.
	var sHtml = FCK.EditorDocument.body.innerHTML ;

	// Cancel operation if the new step is identical to the previous one.
	if ( FCKUndo.CurrentIndex >= 0 && sHtml == FCKUndo.SavedData[ FCKUndo.CurrentIndex ][0] )
		return ;

	// If we reach the Maximun number of undo levels, we must remove the first
	// entry of the list shifting all elements.
	if ( FCKUndo.CurrentIndex + 1 >= FCKConfig.MaxUndoLevels )
		FCKUndo.SavedData.shift() ;
	else
		FCKUndo.CurrentIndex++ ;

	// Get the actual selection.
	var sBookmark ;
	if ( FCK.EditorDocument.selection.type == 'Text' )
		sBookmark = FCK.EditorDocument.selection.createRange().getBookmark() ;

	// Save the new level in front of the actual position.
	FCKUndo.SavedData[ FCKUndo.CurrentIndex ] = [ sHtml, sBookmark ] ;

	FCK.Events.FireEvent( "OnSelectionChange" ) ;
}

FCKUndo.CheckUndoState = function()
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