2 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
\r
3 * Copyright (C) 2003-2009 Frederico Caldeira Knabben
\r
5 * == BEGIN LICENSE ==
\r
7 * Licensed under the terms of any of the following licenses at your
\r
10 * - GNU General Public License Version 2 or later (the "GPL")
\r
11 * http://www.gnu.org/licenses/gpl.html
\r
13 * - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
\r
14 * http://www.gnu.org/licenses/lgpl.html
\r
16 * - Mozilla Public License Version 1.1 or later (the "MPL")
\r
17 * http://www.mozilla.org/MPL/MPL-1.1.html
\r
22 var FCKUndo = new Object() ;
\r
24 FCKUndo.SavedData = new Array() ;
\r
25 FCKUndo.CurrentIndex = -1 ;
\r
26 FCKUndo.TypesCount = 0 ;
\r
27 FCKUndo.Changed = false ; // Is the document changed in respect to its initial image?
\r
28 FCKUndo.MaxTypes = 25 ;
\r
29 FCKUndo.Typing = false ;
\r
30 FCKUndo.SaveLocked = false ;
\r
32 FCKUndo._GetBookmark = function()
\r
34 FCKSelection.Restore() ;
\r
36 var range = new FCKDomRange( FCK.EditorWindow ) ;
\r
39 // There are some tricky cases where this might fail (e.g. having a lone empty table in IE)
\r
40 range.MoveToSelection() ;
\r
46 if ( FCKBrowserInfo.IsIE )
\r
48 var bookmark = range.CreateBookmark() ;
\r
49 var dirtyHtml = FCK.EditorDocument.body.innerHTML ;
\r
50 range.MoveToBookmark( bookmark ) ;
\r
51 return [ bookmark, dirtyHtml ] ;
\r
53 return range.CreateBookmark2() ;
\r
56 FCKUndo._SelectBookmark = function( bookmark )
\r
61 var range = new FCKDomRange( FCK.EditorWindow ) ;
\r
62 if ( bookmark instanceof Object )
\r
64 if ( FCKBrowserInfo.IsIE )
\r
65 range.MoveToBookmark( bookmark[0] ) ;
\r
67 range.MoveToBookmark2( bookmark ) ;
\r
70 // this does not always succeed, there are still some tricky cases where it fails
\r
71 // e.g. add a special character at end of document, undo, redo -> error
\r
76 // if select restore fails, put the caret at the end of the document
\r
77 range.MoveToPosition( FCK.EditorDocument.body, 4 ) ;
\r
83 FCKUndo._CompareCursors = function( cursor1, cursor2 )
\r
85 for ( var i = 0 ; i < Math.min( cursor1.length, cursor2.length ) ; i++ )
\r
87 if ( cursor1[i] < cursor2[i] )
\r
89 else if (cursor1[i] > cursor2[i] )
\r
92 if ( cursor1.length < cursor2.length )
\r
94 else if (cursor1.length > cursor2.length )
\r
99 FCKUndo._CheckIsBookmarksEqual = function( bookmark1, bookmark2 )
\r
101 if ( ! ( bookmark1 && bookmark2 ) )
\r
103 if ( FCKBrowserInfo.IsIE )
\r
105 var startOffset1 = bookmark1[1].search( bookmark1[0].StartId ) ;
\r
106 var startOffset2 = bookmark2[1].search( bookmark2[0].StartId ) ;
\r
107 var endOffset1 = bookmark1[1].search( bookmark1[0].EndId ) ;
\r
108 var endOffset2 = bookmark2[1].search( bookmark2[0].EndId ) ;
\r
109 return startOffset1 == startOffset2 && endOffset1 == endOffset2 ;
\r
113 return this._CompareCursors( bookmark1.Start, bookmark2.Start ) == 0
\r
114 && this._CompareCursors( bookmark1.End, bookmark2.End ) == 0 ;
\r
118 FCKUndo.SaveUndoStep = function()
\r
120 if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG || this.SaveLocked )
\r
123 // Assume the editor content is changed when SaveUndoStep() is called after the first time.
\r
124 // This also enables the undo button in toolbar.
\r
125 if ( this.SavedData.length )
\r
126 this.Changed = true ;
\r
128 // Get the HTML content.
\r
129 var sHtml = FCK.EditorDocument.body.innerHTML ;
\r
130 var bookmark = this._GetBookmark() ;
\r
132 // Shrink the array to the current level.
\r
133 this.SavedData = this.SavedData.slice( 0, this.CurrentIndex + 1 ) ;
\r
135 // Cancel operation if the new step is identical to the previous one.
\r
136 if ( this.CurrentIndex > 0
\r
137 && sHtml == this.SavedData[ this.CurrentIndex ][0]
\r
138 && this._CheckIsBookmarksEqual( bookmark, this.SavedData[ this.CurrentIndex ][1] ) )
\r
140 // Save the selection and caret position in the first undo level for the first change.
\r
141 else if ( this.CurrentIndex == 0 && this.SavedData.length && sHtml == this.SavedData[0][0] )
\r
143 this.SavedData[0][1] = bookmark ;
\r
147 // If we reach the Maximum number of undo levels, we must remove the first
\r
148 // entry of the list shifting all elements.
\r
149 if ( this.CurrentIndex + 1 >= FCKConfig.MaxUndoLevels )
\r
150 this.SavedData.shift() ;
\r
152 this.CurrentIndex++ ;
\r
154 // Save the new level in front of the actual position.
\r
155 this.SavedData[ this.CurrentIndex ] = [ sHtml, bookmark ] ;
\r
157 FCK.Events.FireEvent( "OnSelectionChange" ) ;
\r
160 FCKUndo.CheckUndoState = function()
\r
162 return ( this.Changed || this.CurrentIndex > 0 ) ;
\r
165 FCKUndo.CheckRedoState = function()
\r
167 return ( this.CurrentIndex < ( this.SavedData.length - 1 ) ) ;
\r
170 FCKUndo.Undo = function()
\r
172 if ( this.CheckUndoState() )
\r
174 // If it is the first step.
\r
175 if ( this.CurrentIndex == ( this.SavedData.length - 1 ) )
\r
177 // Save the actual state for a possible "Redo" call.
\r
178 this.SaveUndoStep() ;
\r
182 this._ApplyUndoLevel( --this.CurrentIndex ) ;
\r
184 FCK.Events.FireEvent( "OnSelectionChange" ) ;
\r
188 FCKUndo.Redo = function()
\r
190 if ( this.CheckRedoState() )
\r
192 // Go a step forward.
\r
193 this._ApplyUndoLevel( ++this.CurrentIndex ) ;
\r
195 FCK.Events.FireEvent( "OnSelectionChange" ) ;
\r
199 FCKUndo._ApplyUndoLevel = function( level )
\r
201 var oData = this.SavedData[ level ] ;
\r
206 // Update the editor contents with that step data.
\r
207 if ( FCKBrowserInfo.IsIE )
\r
209 if ( oData[1] && oData[1][1] )
\r
210 FCK.SetInnerHtml( oData[1][1] ) ;
\r
212 FCK.SetInnerHtml( oData[0] ) ;
\r
215 FCK.EditorDocument.body.innerHTML = oData[0] ;
\r
217 // Restore the selection
\r
218 this._SelectBookmark( oData[1] ) ;
\r
220 this.TypesCount = 0 ;
\r
221 this.Changed = false ;
\r
222 this.Typing = false ;
\r