fckundo.js
上传用户:dbstep
上传日期:2022-08-06
资源大小:2803k
文件大小:6k
- /*
- * 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 ;
- }