--- /dev/null
+/*\r
+ * FCKeditor - The text editor for Internet - http://www.fckeditor.net\r
+ * Copyright (C) 2003-2008 Frederico Caldeira Knabben\r
+ *\r
+ * == BEGIN LICENSE ==\r
+ *\r
+ * Licensed under the terms of any of the following licenses at your\r
+ * choice:\r
+ *\r
+ * - GNU General Public License Version 2 or later (the "GPL")\r
+ * http://www.gnu.org/licenses/gpl.html\r
+ *\r
+ * - GNU Lesser General Public License Version 2.1 or later (the "LGPL")\r
+ * http://www.gnu.org/licenses/lgpl.html\r
+ *\r
+ * - Mozilla Public License Version 1.1 or later (the "MPL")\r
+ * http://www.mozilla.org/MPL/MPL-1.1.html\r
+ *\r
+ * == END LICENSE ==\r
+ */\r
+\r
+var FCKUndo = new Object() ;\r
+\r
+FCKUndo.SavedData = new Array() ;\r
+FCKUndo.CurrentIndex = -1 ;\r
+FCKUndo.TypesCount = 0 ;\r
+FCKUndo.Changed = false ; // Is the document changed in respect to its initial image?\r
+FCKUndo.MaxTypes = 25 ;\r
+FCKUndo.Typing = false ;\r
+FCKUndo.SaveLocked = false ;\r
+\r
+FCKUndo._GetBookmark = function()\r
+{\r
+ FCKSelection.Restore() ;\r
+\r
+ var range = new FCKDomRange( FCK.EditorWindow ) ;\r
+ try\r
+ {\r
+ // There are some tricky cases where this might fail (e.g. having a lone empty table in IE)\r
+ range.MoveToSelection() ;\r
+ }\r
+ catch ( e )\r
+ {\r
+ return null ;\r
+ }\r
+ if ( FCKBrowserInfo.IsIE )\r
+ {\r
+ var bookmark = range.CreateBookmark() ;\r
+ var dirtyHtml = FCK.EditorDocument.body.innerHTML ;\r
+ range.MoveToBookmark( bookmark ) ;\r
+ return [ bookmark, dirtyHtml ] ;\r
+ }\r
+ return range.CreateBookmark2() ;\r
+}\r
+\r
+FCKUndo._SelectBookmark = function( bookmark )\r
+{\r
+ if ( ! bookmark )\r
+ return ;\r
+\r
+ var range = new FCKDomRange( FCK.EditorWindow ) ;\r
+ if ( bookmark instanceof Object )\r
+ {\r
+ if ( FCKBrowserInfo.IsIE )\r
+ range.MoveToBookmark( bookmark[0] ) ;\r
+ else\r
+ range.MoveToBookmark2( bookmark ) ;\r
+ try\r
+ {\r
+ // this does not always succeed, there are still some tricky cases where it fails\r
+ // e.g. add a special character at end of document, undo, redo -> error\r
+ range.Select() ;\r
+ }\r
+ catch ( e )\r
+ {\r
+ // if select restore fails, put the caret at the end of the document\r
+ range.MoveToPosition( FCK.EditorDocument.body, 4 ) ;\r
+ range.Select() ;\r
+ }\r
+ }\r
+}\r
+\r
+FCKUndo._CompareCursors = function( cursor1, cursor2 )\r
+{\r
+ for ( var i = 0 ; i < Math.min( cursor1.length, cursor2.length ) ; i++ )\r
+ {\r
+ if ( cursor1[i] < cursor2[i] )\r
+ return -1;\r
+ else if (cursor1[i] > cursor2[i] )\r
+ return 1;\r
+ }\r
+ if ( cursor1.length < cursor2.length )\r
+ return -1;\r
+ else if (cursor1.length > cursor2.length )\r
+ return 1;\r
+ return 0;\r
+}\r
+\r
+FCKUndo._CheckIsBookmarksEqual = function( bookmark1, bookmark2 )\r
+{\r
+ if ( ! ( bookmark1 && bookmark2 ) )\r
+ return false ;\r
+ if ( FCKBrowserInfo.IsIE )\r
+ {\r
+ var startOffset1 = bookmark1[1].search( bookmark1[0].StartId ) ;\r
+ var startOffset2 = bookmark2[1].search( bookmark2[0].StartId ) ;\r
+ var endOffset1 = bookmark1[1].search( bookmark1[0].EndId ) ;\r
+ var endOffset2 = bookmark2[1].search( bookmark2[0].EndId ) ;\r
+ return startOffset1 == startOffset2 && endOffset1 == endOffset2 ;\r
+ }\r
+ else\r
+ {\r
+ return this._CompareCursors( bookmark1.Start, bookmark2.Start ) == 0\r
+ && this._CompareCursors( bookmark1.End, bookmark2.End ) == 0 ;\r
+ }\r
+}\r
+\r
+FCKUndo.SaveUndoStep = function()\r
+{\r
+ if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG || this.SaveLocked )\r
+ return ;\r
+\r
+ // Assume the editor content is changed when SaveUndoStep() is called after the first time.\r
+ // This also enables the undo button in toolbar.\r
+ if ( this.SavedData.length )\r
+ this.Changed = true ;\r
+\r
+ // Get the HTML content.\r
+ var sHtml = FCK.EditorDocument.body.innerHTML ;\r
+ var bookmark = this._GetBookmark() ;\r
+\r
+ // Shrink the array to the current level.\r
+ this.SavedData = this.SavedData.slice( 0, this.CurrentIndex + 1 ) ;\r
+\r
+ // Cancel operation if the new step is identical to the previous one.\r
+ if ( this.CurrentIndex > 0\r
+ && sHtml == this.SavedData[ this.CurrentIndex ][0]\r
+ && this._CheckIsBookmarksEqual( bookmark, this.SavedData[ this.CurrentIndex ][1] ) )\r
+ return ;\r
+ // Save the selection and caret position in the first undo level for the first change.\r
+ else if ( this.CurrentIndex == 0 && this.SavedData.length && sHtml == this.SavedData[0][0] )\r
+ {\r
+ this.SavedData[0][1] = bookmark ;\r
+ return ;\r
+ }\r
+\r
+ // If we reach the Maximum number of undo levels, we must remove the first\r
+ // entry of the list shifting all elements.\r
+ if ( this.CurrentIndex + 1 >= FCKConfig.MaxUndoLevels )\r
+ this.SavedData.shift() ;\r
+ else\r
+ this.CurrentIndex++ ;\r
+\r
+ // Save the new level in front of the actual position.\r
+ this.SavedData[ this.CurrentIndex ] = [ sHtml, bookmark ] ;\r
+\r
+ FCK.Events.FireEvent( "OnSelectionChange" ) ;\r
+}\r
+\r
+FCKUndo.CheckUndoState = function()\r
+{\r
+ return ( this.Changed || this.CurrentIndex > 0 ) ;\r
+}\r
+\r
+FCKUndo.CheckRedoState = function()\r
+{\r
+ return ( this.CurrentIndex < ( this.SavedData.length - 1 ) ) ;\r
+}\r
+\r
+FCKUndo.Undo = function()\r
+{\r
+ if ( this.CheckUndoState() )\r
+ {\r
+ // If it is the first step.\r
+ if ( this.CurrentIndex == ( this.SavedData.length - 1 ) )\r
+ {\r
+ // Save the actual state for a possible "Redo" call.\r
+ this.SaveUndoStep() ;\r
+ }\r
+\r
+ // Go a step back.\r
+ this._ApplyUndoLevel( --this.CurrentIndex ) ;\r
+\r
+ FCK.Events.FireEvent( "OnSelectionChange" ) ;\r
+ }\r
+}\r
+\r
+FCKUndo.Redo = function()\r
+{\r
+ if ( this.CheckRedoState() )\r
+ {\r
+ // Go a step forward.\r
+ this._ApplyUndoLevel( ++this.CurrentIndex ) ;\r
+\r
+ FCK.Events.FireEvent( "OnSelectionChange" ) ;\r
+ }\r
+}\r
+\r
+FCKUndo._ApplyUndoLevel = function( level )\r
+{\r
+ var oData = this.SavedData[ level ] ;\r
+\r
+ if ( !oData )\r
+ return ;\r
+\r
+ // Update the editor contents with that step data.\r
+ if ( FCKBrowserInfo.IsIE )\r
+ {\r
+ if ( oData[1] && oData[1][1] )\r
+ FCK.SetInnerHtml( oData[1][1] ) ;\r
+ else\r
+ FCK.SetInnerHtml( oData[0] ) ;\r
+ }\r
+ else\r
+ FCK.EditorDocument.body.innerHTML = oData[0] ;\r
+\r
+ // Restore the selection\r
+ this._SelectBookmark( oData[1] ) ;\r
+\r
+ this.TypesCount = 0 ;\r
+ this.Changed = false ;\r
+ this.Typing = false ;\r
+}\r