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/*
* FCKeditor - The text editor for Internet - http://www.fckeditor.net
* Copyright (C) 2003-2009 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 ==
*/
var FCKUndo = new Object() ;
FCKUndo.SavedData = new Array() ;
FCKUndo.CurrentIndex = -1 ;
FCKUndo.TypesCount = 0 ;
FCKUndo.Changed = false ; // Is the document changed in respect to its initial image?
FCKUndo.MaxTypes = 25 ;
FCKUndo.Typing = false ;
FCKUndo.SaveLocked = false ;
FCKUndo._GetBookmark = function()
{
FCKSelection.Restore() ;
var range = new FCKDomRange( FCK.EditorWindow ) ;
try
{
// There are some tricky cases where this might fail (e.g. having a lone empty table in IE)
range.MoveToSelection() ;
}
catch ( e )
{
return null ;
}
if ( FCKBrowserInfo.IsIE )
{
var bookmark = range.CreateBookmark() ;
var dirtyHtml = FCK.EditorDocument.body.innerHTML ;
range.MoveToBookmark( bookmark ) ;
return [ bookmark, dirtyHtml ] ;
}
return range.CreateBookmark2() ;
}
FCKUndo._SelectBookmark = function( bookmark )
{
if ( ! bookmark )
return ;
var range = new FCKDomRange( FCK.EditorWindow ) ;
if ( bookmark instanceof Object )
{
if ( FCKBrowserInfo.IsIE )
range.MoveToBookmark( bookmark[0] ) ;
else
range.MoveToBookmark2( bookmark ) ;
try
{
// this does not always succeed, there are still some tricky cases where it fails
// e.g. add a special character at end of document, undo, redo -> error
range.Select() ;
}
catch ( e )
{
// if select restore fails, put the caret at the end of the document
range.MoveToPosition( FCK.EditorDocument.body, 4 ) ;
range.Select() ;
}
}
}
FCKUndo._CompareCursors = function( cursor1, cursor2 )
{
for ( var i = 0 ; i < Math.min( cursor1.length, cursor2.length ) ; i++ )
{
if ( cursor1[i] < cursor2[i] )
return -1;
else if (cursor1[i] > cursor2[i] )
return 1;
}
if ( cursor1.length < cursor2.length )
return -1;
else if (cursor1.length > cursor2.length )
return 1;
return 0;
}
FCKUndo._CheckIsBookmarksEqual = function( bookmark1, bookmark2 )
{
if ( ! ( bookmark1 && bookmark2 ) )
return false ;
if ( FCKBrowserInfo.IsIE )
{
var startOffset1 = bookmark1[1].search( bookmark1[0].StartId ) ;
var startOffset2 = bookmark2[1].search( bookmark2[0].StartId ) ;
var endOffset1 = bookmark1[1].search( bookmark1[0].EndId ) ;
var endOffset2 = bookmark2[1].search( bookmark2[0].EndId ) ;
return startOffset1 == startOffset2 && endOffset1 == endOffset2 ;
}
else
{
return this._CompareCursors( bookmark1.Start, bookmark2.Start ) == 0
&& this._CompareCursors( bookmark1.End, bookmark2.End ) == 0 ;
}
}
FCKUndo.SaveUndoStep = function()
{
if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG || this.SaveLocked )
return ;
// Assume the editor content is changed when SaveUndoStep() is called after the first time.
// This also enables the undo button in toolbar.
if ( this.SavedData.length )
this.Changed = true ;
// Get the HTML content.
var sHtml = FCK.EditorDocument.body.innerHTML ;
var bookmark = this._GetBookmark() ;
// Shrink the array to the current level.
this.SavedData = this.SavedData.slice( 0, this.CurrentIndex + 1 ) ;
// Cancel operation if the new step is identical to the previous one.
if ( this.CurrentIndex > 0
&& sHtml == this.SavedData[ this.CurrentIndex ][0]
&& this._CheckIsBookmarksEqual( bookmark, this.SavedData[ this.CurrentIndex ][1] ) )
return ;
// Save the selection and caret position in the first undo level for the first change.
else if ( this.CurrentIndex == 0 && this.SavedData.length && sHtml == this.SavedData[0][0] )
{
this.SavedData[0][1] = bookmark ;
return ;
}
// If we reach the Maximum number of undo levels, we must remove the first
// entry of the list shifting all elements.
if ( this.CurrentIndex + 1 >= FCKConfig.MaxUndoLevels )
this.SavedData.shift() ;
else
this.CurrentIndex++ ;
// Save the new level in front of the actual position.
this.SavedData[ this.CurrentIndex ] = [ sHtml, bookmark ] ;
FCK.Events.FireEvent( "OnSelectionChange" ) ;
}
FCKUndo.CheckUndoState = function()
{
return ( this.Changed || this.CurrentIndex > 0 ) ;
}
FCKUndo.CheckRedoState = function()
{
return ( this.CurrentIndex < ( this.SavedData.length - 1 ) ) ;
}
FCKUndo.Undo = function()
{
if ( this.CheckUndoState() )
{
// If it is the first step.
if ( this.CurrentIndex == ( this.SavedData.length - 1 ) )
{
// Save the actual state for a possible "Redo" call.
this.SaveUndoStep() ;
}
// Go a step back.
this._ApplyUndoLevel( --this.CurrentIndex ) ;
FCK.Events.FireEvent( "OnSelectionChange" ) ;
}
}
FCKUndo.Redo = function()
{
if ( this.CheckRedoState() )
{
// Go a step forward.
this._ApplyUndoLevel( ++this.CurrentIndex ) ;
FCK.Events.FireEvent( "OnSelectionChange" ) ;
}
}
FCKUndo._ApplyUndoLevel = function( level )
{
var oData = this.SavedData[ level ] ;
if ( !oData )
return ;
// Update the editor contents with that step data.
if ( FCKBrowserInfo.IsIE )
{
if ( oData[1] && oData[1][1] )
FCK.SetInnerHtml( oData[1][1] ) ;
else
FCK.SetInnerHtml( oData[0] ) ;
}
else
FCK.EditorDocument.body.innerHTML = oData[0] ;
// Restore the selection
this._SelectBookmark( oData[1] ) ;
this.TypesCount = 0 ;
this.Changed = false ;
this.Typing = false ;
}
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