source: sandbox/filemanager/tp/fckeditor/editor/_source/internals/fckundo.js @ 1575

Revision 1575, 5.8 KB checked in by amuller, 14 years ago (diff)

Ticket #597 - Implentação, melhorias do modulo gerenciador de arquivos

  • Property svn:executable set to *
Line 
1/*
2 * FCKeditor - The text editor for Internet - http://www.fckeditor.net
3 * Copyright (C) 2003-2009 Frederico Caldeira Knabben
4 *
5 * == BEGIN LICENSE ==
6 *
7 * Licensed under the terms of any of the following licenses at your
8 * choice:
9 *
10 *  - GNU General Public License Version 2 or later (the "GPL")
11 *    http://www.gnu.org/licenses/gpl.html
12 *
13 *  - GNU Lesser General Public License Version 2.1 or later (the "LGPL")
14 *    http://www.gnu.org/licenses/lgpl.html
15 *
16 *  - Mozilla Public License Version 1.1 or later (the "MPL")
17 *    http://www.mozilla.org/MPL/MPL-1.1.html
18 *
19 * == END LICENSE ==
20 */
21
22var FCKUndo = new Object() ;
23
24FCKUndo.SavedData = new Array() ;
25FCKUndo.CurrentIndex = -1 ;
26FCKUndo.TypesCount = 0 ;
27FCKUndo.Changed = false ;       // Is the document changed in respect to its initial image?
28FCKUndo.MaxTypes = 25 ;
29FCKUndo.Typing = false ;
30FCKUndo.SaveLocked = false ;
31
32FCKUndo._GetBookmark = function()
33{
34        FCKSelection.Restore() ;
35
36        var range = new FCKDomRange( FCK.EditorWindow ) ;
37        try
38        {
39                // There are some tricky cases where this might fail (e.g. having a lone empty table in IE)
40                range.MoveToSelection() ;
41        }
42        catch ( e )
43        {
44                return null ;
45        }
46        if ( FCKBrowserInfo.IsIE )
47        {
48                var bookmark = range.CreateBookmark() ;
49                var dirtyHtml = FCK.EditorDocument.body.innerHTML ;
50                range.MoveToBookmark( bookmark ) ;
51                return [ bookmark, dirtyHtml ] ;
52        }
53        return range.CreateBookmark2() ;
54}
55
56FCKUndo._SelectBookmark = function( bookmark )
57{
58        if ( ! bookmark )
59                return ;
60
61        var range = new FCKDomRange( FCK.EditorWindow ) ;
62        if ( bookmark instanceof Object )
63        {
64                if ( FCKBrowserInfo.IsIE )
65                        range.MoveToBookmark( bookmark[0] ) ;
66                else
67                        range.MoveToBookmark2( bookmark ) ;
68                try
69                {
70                        // this does not always succeed, there are still some tricky cases where it fails
71                        // e.g. add a special character at end of document, undo, redo -> error
72                        range.Select() ;
73                }
74                catch ( e )
75                {
76                        // if select restore fails, put the caret at the end of the document
77                        range.MoveToPosition( FCK.EditorDocument.body, 4 ) ;
78                        range.Select() ;
79                }
80        }
81}
82
83FCKUndo._CompareCursors = function( cursor1, cursor2 )
84{
85        for ( var i = 0 ; i < Math.min( cursor1.length, cursor2.length ) ; i++ )
86        {
87                if ( cursor1[i] < cursor2[i] )
88                        return -1;
89                else if (cursor1[i] > cursor2[i] )
90                        return 1;
91        }
92        if ( cursor1.length < cursor2.length )
93                return -1;
94        else if (cursor1.length > cursor2.length )
95                return 1;
96        return 0;
97}
98
99FCKUndo._CheckIsBookmarksEqual = function( bookmark1, bookmark2 )
100{
101        if ( ! ( bookmark1 && bookmark2 ) )
102                return false ;
103        if ( FCKBrowserInfo.IsIE )
104        {
105                var startOffset1 = bookmark1[1].search( bookmark1[0].StartId ) ;
106                var startOffset2 = bookmark2[1].search( bookmark2[0].StartId ) ;
107                var endOffset1 = bookmark1[1].search( bookmark1[0].EndId ) ;
108                var endOffset2 = bookmark2[1].search( bookmark2[0].EndId ) ;
109                return startOffset1 == startOffset2 && endOffset1 == endOffset2 ;
110        }
111        else
112        {
113                return this._CompareCursors( bookmark1.Start, bookmark2.Start ) == 0
114                        && this._CompareCursors( bookmark1.End, bookmark2.End ) == 0 ;
115        }
116}
117
118FCKUndo.SaveUndoStep = function()
119{
120        if ( FCK.EditMode != FCK_EDITMODE_WYSIWYG || this.SaveLocked )
121                return ;
122
123        // Assume the editor content is changed when SaveUndoStep() is called after the first time.
124        // This also enables the undo button in toolbar.
125        if ( this.SavedData.length )
126                this.Changed = true ;
127
128        // Get the HTML content.
129        var sHtml = FCK.EditorDocument.body.innerHTML ;
130        var bookmark = this._GetBookmark() ;
131
132        // Shrink the array to the current level.
133        this.SavedData = this.SavedData.slice( 0, this.CurrentIndex + 1 ) ;
134
135        // Cancel operation if the new step is identical to the previous one.
136        if ( this.CurrentIndex > 0
137                        && sHtml == this.SavedData[ this.CurrentIndex ][0]
138                        && this._CheckIsBookmarksEqual( bookmark, this.SavedData[ this.CurrentIndex ][1] ) )
139                return ;
140        // Save the selection and caret position in the first undo level for the first change.
141        else if ( this.CurrentIndex == 0 && this.SavedData.length && sHtml == this.SavedData[0][0] )
142        {
143                this.SavedData[0][1] = bookmark ;
144                return ;
145        }
146
147        // If we reach the Maximum number of undo levels, we must remove the first
148        // entry of the list shifting all elements.
149        if ( this.CurrentIndex + 1 >= FCKConfig.MaxUndoLevels )
150                this.SavedData.shift() ;
151        else
152                this.CurrentIndex++ ;
153
154        // Save the new level in front of the actual position.
155        this.SavedData[ this.CurrentIndex ] = [ sHtml, bookmark ] ;
156
157        FCK.Events.FireEvent( "OnSelectionChange" ) ;
158}
159
160FCKUndo.CheckUndoState = function()
161{
162        return ( this.Changed || this.CurrentIndex > 0 ) ;
163}
164
165FCKUndo.CheckRedoState = function()
166{
167        return ( this.CurrentIndex < ( this.SavedData.length - 1 ) ) ;
168}
169
170FCKUndo.Undo = function()
171{
172        if ( this.CheckUndoState() )
173        {
174                // If it is the first step.
175                if ( this.CurrentIndex == ( this.SavedData.length - 1 ) )
176                {
177                        // Save the actual state for a possible "Redo" call.
178                        this.SaveUndoStep() ;
179                }
180
181                // Go a step back.
182                this._ApplyUndoLevel( --this.CurrentIndex ) ;
183
184                FCK.Events.FireEvent( "OnSelectionChange" ) ;
185        }
186}
187
188FCKUndo.Redo = function()
189{
190        if ( this.CheckRedoState() )
191        {
192                // Go a step forward.
193                this._ApplyUndoLevel( ++this.CurrentIndex ) ;
194
195                FCK.Events.FireEvent( "OnSelectionChange" ) ;
196        }
197}
198
199FCKUndo._ApplyUndoLevel = function( level )
200{
201        var oData = this.SavedData[ level ] ;
202
203        if ( !oData )
204                return ;
205
206        // Update the editor contents with that step data.
207        if ( FCKBrowserInfo.IsIE )
208        {
209                if ( oData[1] && oData[1][1] )
210                        FCK.SetInnerHtml( oData[1][1] ) ;
211                else
212                        FCK.SetInnerHtml( oData[0] ) ;
213        }
214        else
215                FCK.EditorDocument.body.innerHTML = oData[0] ;
216
217        // Restore the selection
218        this._SelectBookmark( oData[1] ) ;
219
220        this.TypesCount = 0 ;
221        this.Changed = false ;
222        this.Typing = false ;
223}
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