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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 ==
*
* IE specific implementation for the Undo/Redo system.
*/
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()
{
return ( FCKUndo.Typing || FCKUndo.CurrentIndex > 0 ) ;
}
FCKUndo.CheckRedoState = function()
{
return ( !FCKUndo.Typing && FCKUndo.CurrentIndex < ( FCKUndo.SavedData.length - 1 ) ) ;
}
FCKUndo.Undo = function()
{
if ( FCKUndo.CheckUndoState() )
{
// If it is the first step.
if ( FCKUndo.CurrentIndex == ( FCKUndo.SavedData.length - 1 ) )
{
// Save the actual state for a possible "Redo" call.
FCKUndo.SaveUndoStep() ;
}
// Go a step back.
FCKUndo._ApplyUndoLevel( --FCKUndo.CurrentIndex ) ;
FCK.Events.FireEvent( "OnSelectionChange" ) ;
}
}
FCKUndo.Redo = function()
{
if ( FCKUndo.CheckRedoState() )
{
// Go a step forward.
FCKUndo._ApplyUndoLevel( ++FCKUndo.CurrentIndex ) ;
FCK.Events.FireEvent( "OnSelectionChange" ) ;
}
}
FCKUndo._ApplyUndoLevel = function(level)
{
var oData = FCKUndo.SavedData[ level ] ;
if ( !oData )
return ;
// Update the editor contents with that step data.
FCK.SetInnerHtml( oData[0] ) ;
// FCK.EditorDocument.body.innerHTML = oData[0] ;
if ( oData[1] )
{
var oRange = FCK.EditorDocument.selection.createRange() ;
oRange.moveToBookmark( oData[1] ) ;
oRange.select() ;
}
FCKUndo.TypesCount = 0 ;
FCKUndo.Typing = false ;
}

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