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