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/* |
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* FCKeditor - The text editor for Internet - http://www.fckeditor.net |
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* Copyright (C) 2003-2009 Frederico Caldeira Knabben |
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* |
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* == BEGIN LICENSE == |
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* |
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* Licensed under the terms of any of the following licenses at your |
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* choice: |
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* |
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* - GNU General Public License Version 2 or later (the "GPL") |
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* http://www.gnu.org/licenses/gpl.html |
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* |
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* - GNU Lesser General Public License Version 2.1 or later (the "LGPL") |
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* http://www.gnu.org/licenses/lgpl.html |
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* |
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* - Mozilla Public License Version 1.1 or later (the "MPL") |
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* http://www.mozilla.org/MPL/MPL-1.1.html |
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* |
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* == END LICENSE == |
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*/ |
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|
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var FCKUndo = new Object() ; |
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|
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FCKUndo.SavedData = new Array() ; |
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FCKUndo.CurrentIndex = -1 ; |
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FCKUndo.TypesCount = 0 ; |
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FCKUndo.Changed = false ; // Is the document changed in respect to its initial image? |
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FCKUndo.MaxTypes = 25 ; |
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FCKUndo.Typing = false ; |
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FCKUndo.SaveLocked = false ; |
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|
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FCKUndo._GetBookmark = function() |
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{ |
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FCKSelection.Restore() ; |
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|
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var range = new FCKDomRange( FCK.EditorWindow ) ; |
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try |
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{ |
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// There are some tricky cases where this might fail (e.g. having a lone empty table in IE) |
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range.MoveToSelection() ; |
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} |
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catch ( e ) |
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{ |
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return null ; |
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} |
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if ( FCKBrowserInfo.IsIE ) |
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{ |
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var bookmark = range.CreateBookmark() ; |
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var dirtyHtml = FCK.EditorDocument.body.innerHTML ; |
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range.MoveToBookmark( bookmark ) ; |
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return [ bookmark, dirtyHtml ] ; |
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} |
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return range.CreateBookmark2() ; |
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} |
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|
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FCKUndo._SelectBookmark = function( bookmark ) |
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{ |
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if ( ! bookmark ) |
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return ; |
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|
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var range = new FCKDomRange( FCK.EditorWindow ) ; |
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if ( bookmark instanceof Object ) |
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{ |
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if ( FCKBrowserInfo.IsIE ) |
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range.MoveToBookmark( bookmark[0] ) ; |
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else |
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range.MoveToBookmark2( bookmark ) ; |
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try |
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{ |
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// this does not always succeed, there are still some tricky cases where it fails |
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// e.g. add a special character at end of document, undo, redo -> error |
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range.Select() ; |
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} |
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catch ( e ) |
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{ |
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// if select restore fails, put the caret at the end of the document |
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range.MoveToPosition( FCK.EditorDocument.body, 4 ) ; |
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range.Select() ; |
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} |
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} |
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} |
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|
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FCKUndo._CompareCursors = function( cursor1, cursor2 ) |
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{ |
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for ( var i = 0 ; i < Math.min( cursor1.length, cursor2.length ) ; i++ ) |
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{ |
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if ( cursor1[i] < cursor2[i] ) |
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return -1; |
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else if (cursor1[i] > cursor2[i] ) |
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return 1; |
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} |
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if ( cursor1.length < cursor2.length ) |
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return -1; |
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else if (cursor1.length > cursor2.length ) |
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return 1; |
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return 0; |
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} |
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|
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FCKUndo._CheckIsBookmarksEqual = function( bookmark1, bookmark2 ) |
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{ |
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if ( ! ( bookmark1 && bookmark2 ) ) |
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return false ; |
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if ( FCKBrowserInfo.IsIE ) |
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{ |
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var startOffset1 = bookmark1[1].search( bookmark1[0].StartId ) ; |
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var startOffset2 = bookmark2[1].search( bookmark2[0].StartId ) ; |
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var endOffset1 = bookmark1[1].search( bookmark1[0].EndId ) ; |
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var endOffset2 = bookmark2[1].search( bookmark2[0].EndId ) ; |
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return startOffset1 == startOffset2 && endOffset1 == endOffset2 ; |
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} |
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else |
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{ |
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return this._CompareCursors( bookmark1.Start, bookmark2.Start ) == 0 |
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&& this._CompareCursors( bookmark1.End, bookmark2.End ) == 0 ; |
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} |
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} |
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|
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FCKUndo.SaveUndoStep = function() |
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{ |
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if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG || this.SaveLocked ) |
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return ; |
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|
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// Assume the editor content is changed when SaveUndoStep() is called after the first time. |
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// This also enables the undo button in toolbar. |
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if ( this.SavedData.length ) |
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this.Changed = true ; |
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|
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// Get the HTML content. |
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var sHtml = FCK.EditorDocument.body.innerHTML ; |
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var bookmark = this._GetBookmark() ; |
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|
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// Shrink the array to the current level. |
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this.SavedData = this.SavedData.slice( 0, this.CurrentIndex + 1 ) ; |
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|
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// Cancel operation if the new step is identical to the previous one. |
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if ( this.CurrentIndex > 0 |
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&& sHtml == this.SavedData[ this.CurrentIndex ][0] |
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&& this._CheckIsBookmarksEqual( bookmark, this.SavedData[ this.CurrentIndex ][1] ) ) |
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return ; |
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// Save the selection and caret position in the first undo level for the first change. |
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else if ( this.CurrentIndex == 0 && this.SavedData.length && sHtml == this.SavedData[0][0] ) |
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{ |
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this.SavedData[0][1] = bookmark ; |
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return ; |
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} |
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|
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// If we reach the Maximum number of undo levels, we must remove the first |
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// entry of the list shifting all elements. |
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if ( this.CurrentIndex + 1 >= FCKConfig.MaxUndoLevels ) |
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this.SavedData.shift() ; |
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else |
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this.CurrentIndex++ ; |
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|
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// Save the new level in front of the actual position. |
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this.SavedData[ this.CurrentIndex ] = [ sHtml, bookmark ] ; |
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|
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FCK.Events.FireEvent( "OnSelectionChange" ) ; |
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} |
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|
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FCKUndo.CheckUndoState = function() |
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{ |
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return ( this.Changed || this.CurrentIndex > 0 ) ; |
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} |
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|
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FCKUndo.CheckRedoState = function() |
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{ |
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return ( this.CurrentIndex < ( this.SavedData.length - 1 ) ) ; |
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} |
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|
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FCKUndo.Undo = function() |
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{ |
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if ( this.CheckUndoState() ) |
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{ |
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// If it is the first step. |
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if ( this.CurrentIndex == ( this.SavedData.length - 1 ) ) |
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{ |
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// Save the actual state for a possible "Redo" call. |
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this.SaveUndoStep() ; |
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} |
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|
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// Go a step back. |
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this._ApplyUndoLevel( --this.CurrentIndex ) ; |
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|
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FCK.Events.FireEvent( "OnSelectionChange" ) ; |
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} |
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} |
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|
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FCKUndo.Redo = function() |
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{ |
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if ( this.CheckRedoState() ) |
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{ |
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// Go a step forward. |
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this._ApplyUndoLevel( ++this.CurrentIndex ) ; |
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|
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FCK.Events.FireEvent( "OnSelectionChange" ) ; |
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} |
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} |
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|
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FCKUndo._ApplyUndoLevel = function( level ) |
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{ |
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var oData = this.SavedData[ level ] ; |
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|
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if ( !oData ) |
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return ; |
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|
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// Update the editor contents with that step data. |
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if ( FCKBrowserInfo.IsIE ) |
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{ |
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if ( oData[1] && oData[1][1] ) |
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FCK.SetInnerHtml( oData[1][1] ) ; |
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else |
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FCK.SetInnerHtml( oData[0] ) ; |
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} |
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else |
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FCK.EditorDocument.body.innerHTML = oData[0] ; |
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|
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// Restore the selection |
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this._SelectBookmark( oData[1] ) ; |
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|
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this.TypesCount = 0 ; |
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this.Changed = false ; |
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this.Typing = false ; |
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} |
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|
