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<h1>Foundation/CPUndoManager.j</h1><a href="_c_p_undo_manager_8j.html">Go to the documentation of this file.</a><div class="fragment"><pre class="fragment"><a name="l00001"></a>00001 <span class="comment">/*</span>
<a name="l00002"></a>00002 <span class="comment"> * CPUndoManager.j</span>
<a name="l00003"></a>00003 <span class="comment"> * Foundation</span>
<a name="l00004"></a>00004 <span class="comment"> *</span>
<a name="l00005"></a>00005 <span class="comment"> * Created by Francisco Tolmasky.</span>
<a name="l00006"></a>00006 <span class="comment"> * Copyright 2008, 280 North, Inc.</span>
<a name="l00007"></a>00007 <span class="comment"> *</span>
<a name="l00008"></a>00008 <span class="comment"> * This library is free software; you can redistribute it and/or</span>
<a name="l00009"></a>00009 <span class="comment"> * modify it under the terms of the GNU Lesser General Public</span>
<a name="l00010"></a>00010 <span class="comment"> * License as published by the Free Software Foundation; either</span>
<a name="l00011"></a>00011 <span class="comment"> * version 2.1 of the License, or (at your option) any later version.</span>
<a name="l00012"></a>00012 <span class="comment"> *</span>
<a name="l00013"></a>00013 <span class="comment"> * This library is distributed in the hope that it will be useful,</span>
<a name="l00014"></a>00014 <span class="comment"> * but WITHOUT ANY WARRANTY; without even the implied warranty of</span>
<a name="l00015"></a>00015 <span class="comment"> * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU</span>
<a name="l00016"></a>00016 <span class="comment"> * Lesser General Public License for more details.</span>
<a name="l00017"></a>00017 <span class="comment"> *</span>
<a name="l00018"></a>00018 <span class="comment"> * You should have received a copy of the GNU Lesser General Public</span>
<a name="l00019"></a>00019 <span class="comment"> * License along with this library; if not, write to the Free Software</span>
<a name="l00020"></a>00020 <span class="comment"> * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA</span>
<a name="l00021"></a>00021 <span class="comment"> */</span>
<a name="l00022"></a>00022 
<a name="l00023"></a>00023 @<span class="keyword">import</span> <span class="stringliteral">&quot;CPObject.j&quot;</span>
<a name="l00024"></a>00024 @<span class="keyword">import</span> <span class="stringliteral">&quot;CPInvocation.j&quot;</span>
<a name="l00025"></a>00025 @<span class="keyword">import</span> <span class="stringliteral">&quot;CPProxy.j&quot;</span>
<a name="l00026"></a>00026 
<a name="l00027"></a>00027 
<a name="l00028"></a><a class="code" href="_c_p_undo_manager_8j.html#a6d4c58cc19ea1d126dc40a9458637aa3">00028</a> var <a class="code" href="_c_p_undo_manager_8j.html#a6d4c58cc19ea1d126dc40a9458637aa3">CPUndoManagerNormal</a>     = 0,
<a name="l00029"></a><a class="code" href="_c_p_undo_manager_8j.html#aaad25405c75ea3c461633b915b8580a9">00029</a>     <a class="code" href="_c_p_undo_manager_8j.html#aaad25405c75ea3c461633b915b8580a9">CPUndoManagerUndoing</a>    = 1,
<a name="l00030"></a><a class="code" href="_c_p_undo_manager_8j.html#ad5a4e307fcd13b1c8d87de9208c374dc">00030</a>     <a class="code" href="_c_p_undo_manager_8j.html#ad5a4e307fcd13b1c8d87de9208c374dc">CPUndoManagerRedoing</a>    = 2;
<a name="l00031"></a>00031     
<a name="l00032"></a><a class="code" href="_c_p_undo_manager_8j.html#acadaf2cacdbc79e756798193f272588e">00032</a> <a class="code" href="_c_p_undo_manager_8j.html#acadaf2cacdbc79e756798193f272588e">CPUndoManagerCheckpointNotification</a>         = <span class="stringliteral">@&quot;CPUndoManagerCheckpointNotification&quot;</span>;
<a name="l00033"></a><a class="code" href="_c_p_undo_manager_8j.html#ac7016a0c68d5cce445ca92356b44b398">00033</a> <a class="code" href="_c_p_undo_manager_8j.html#ac7016a0c68d5cce445ca92356b44b398">CPUndoManagerDidOpenUndoGroupNotification</a>   = <span class="stringliteral">@&quot;CPUndoManagerDidOpenUndoGroupNotification&quot;</span>;
<a name="l00034"></a><a class="code" href="_c_p_undo_manager_8j.html#a29024e7360f105ca9e89b73ef7876115">00034</a> <a class="code" href="_c_p_undo_manager_8j.html#a29024e7360f105ca9e89b73ef7876115">CPUndoManagerDidRedoChangeNotification</a>      = <span class="stringliteral">@&quot;CPUndoManagerDidRedoChangeNotification&quot;</span>;
<a name="l00035"></a><a class="code" href="_c_p_undo_manager_8j.html#ab7d81e9affd559bef4b45845a4566e08">00035</a> <a class="code" href="_c_p_undo_manager_8j.html#ab7d81e9affd559bef4b45845a4566e08">CPUndoManagerDidUndoChangeNotification</a>      = <span class="stringliteral">@&quot;CPUndoManagerDidUndoChangeNotification&quot;</span>;
<a name="l00036"></a><a class="code" href="_c_p_undo_manager_8j.html#a7592964b54d78bc3d6b48ab64ecc2a78">00036</a> <a class="code" href="_c_p_undo_manager_8j.html#a7592964b54d78bc3d6b48ab64ecc2a78">CPUndoManagerWillCloseUndoGroupNotification</a> = <span class="stringliteral">@&quot;CPUndoManagerWillCloseUndoGroupNotification&quot;</span>;
<a name="l00037"></a><a class="code" href="_c_p_undo_manager_8j.html#ad2d2af04224ccb9bc6333a64549918ad">00037</a> <a class="code" href="_c_p_undo_manager_8j.html#ad2d2af04224ccb9bc6333a64549918ad">CPUndoManagerWillRedoChangeNotification</a>     = <span class="stringliteral">@&quot;CPUndoManagerWillRedoChangeNotification&quot;</span>;
<a name="l00038"></a><a class="code" href="_c_p_undo_manager_8j.html#ac6a4066be9f9ccbd32f8572f71f23a6c">00038</a> <a class="code" href="_c_p_undo_manager_8j.html#ac6a4066be9f9ccbd32f8572f71f23a6c">CPUndoManagerWillUndoChangeNotification</a>     = <span class="stringliteral">@&quot;CPUndoManagerWillUndoChangeNotification&quot;</span>;
<a name="l00039"></a>00039 
<a name="l00040"></a><a class="code" href="_c_p_undo_manager_8j.html#adddd9ef300706e19bc2ae86c522dad4c">00040</a> <a class="code" href="_c_p_undo_manager_8j.html#adddd9ef300706e19bc2ae86c522dad4c">CPUndoCloseGroupingRunLoopOrdering</a>          = 350000;
<a name="l00041"></a>00041 
<a name="l00042"></a>00042 var _CPUndoGroupingPool         = [],
<a name="l00043"></a>00043     _CPUndoGroupingPoolCapacity = 5;
<a name="l00044"></a>00044 
<a name="l00045"></a>00045 <span class="comment">/* @ignore */</span>
<a name="l00046"></a>00046 <span class="keyword">@implementation </span>_CPUndoGrouping : <a class="code" href="class_c_p_object.html" title="The root class from which most classes are subclassed.">CPObject</a>
<a name="l00047"></a>00047 {
<a name="l00048"></a>00048     _CPUndoGrouping _parent;
<a name="l00049"></a>00049     <a class="code" href="class_c_p_mutable_array.html">CPMutableArray</a>  _invocations;
<a name="l00050"></a>00050 }
<a name="l00051"></a>00051 
<a name="l00052"></a>00052 + (void)_poolUndoGrouping:(_CPUndoGrouping)anUndoGrouping
<a name="l00053"></a>00053 {
<a name="l00054"></a>00054     <span class="keywordflow">if</span> (!anUndoGrouping || _CPUndoGroupingPool.length &gt;= _CPUndoGroupingPoolCapacity)
<a name="l00055"></a>00055         <span class="keywordflow">return</span>;
<a name="l00056"></a>00056         
<a name="l00057"></a>00057     _CPUndoGroupingPool.push(anUndoGrouping);
<a name="l00058"></a>00058 }
<a name="l00059"></a>00059 
<a name="l00060"></a>00060 + (id)undoGroupingWithParent:(_CPUndoGrouping)anUndoGrouping
<a name="l00061"></a>00061 {
<a name="l00062"></a>00062     <span class="keywordflow">if</span> (_CPUndoGroupingPool.length)
<a name="l00063"></a>00063     {
<a name="l00064"></a>00064         var grouping = _CPUndoGroupingPool.pop();
<a name="l00065"></a>00065         
<a name="l00066"></a>00066         grouping._parent = anUndoGrouping;
<a name="l00067"></a>00067         
<a name="l00068"></a>00068         <span class="keywordflow">if</span> (grouping._invocations.length)
<a name="l00069"></a>00069             grouping._invocations = [];
<a name="l00070"></a>00070         
<a name="l00071"></a>00071         <span class="keywordflow">return</span> grouping;
<a name="l00072"></a>00072     }
<a name="l00073"></a>00073     
<a name="l00074"></a>00074     <span class="keywordflow">return</span> [[<span class="keyword">self</span> alloc] initWithParent:anUndoGrouping];
<a name="l00075"></a>00075 }
<a name="l00076"></a>00076 
<a name="l00077"></a>00077 - (id)initWithParent:(_CPUndoGrouping)anUndoGrouping
<a name="l00078"></a>00078 {
<a name="l00079"></a>00079     <span class="keyword">self</span> = [<span class="keyword">super</span> init];
<a name="l00080"></a>00080     
<a name="l00081"></a>00081     <span class="keywordflow">if</span> (<span class="keyword">self</span>)
<a name="l00082"></a>00082     {
<a name="l00083"></a>00083         _parent = anUndoGrouping;
<a name="l00084"></a>00084         _invocations = [];
<a name="l00085"></a>00085     }
<a name="l00086"></a>00086     
<a name="l00087"></a>00087     <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00088"></a>00088 }
<a name="l00089"></a>00089 
<a name="l00090"></a>00090 - (_CPUndoGrouping)parent
<a name="l00091"></a>00091 {
<a name="l00092"></a>00092     <span class="keywordflow">return</span> _parent;
<a name="l00093"></a>00093 }
<a name="l00094"></a>00094 
<a name="l00095"></a>00095 - (void)addInvocation:(<a class="code" href="class_c_p_invocation.html" title="An object representation of a message.">CPInvocation</a>)anInvocation
<a name="l00096"></a>00096 {
<a name="l00097"></a>00097     _invocations.push(anInvocation);
<a name="l00098"></a>00098 }
<a name="l00099"></a>00099 
<a name="l00100"></a>00100 - (void)addInvocationsFromArray:(<a class="code" href="class_c_p_array.html" title="A mutable array backed by a JavaScript Array.A mutable array class backed by a JavaScript...">CPArray</a>)invocations
<a name="l00101"></a>00101 {
<a name="l00102"></a>00102     [_invocations addObjectsFromArray:invocations];
<a name="l00103"></a>00103 }
<a name="l00104"></a>00104 
<a name="l00105"></a>00105 - (BOOL)removeInvocationsWithTarget:(<span class="keywordtype">id</span>)aTarget
<a name="l00106"></a>00106 {
<a name="l00107"></a>00107     var index = _invocations.length;
<a name="l00108"></a>00108 
<a name="l00109"></a>00109     <span class="keywordflow">while</span> (index--)
<a name="l00110"></a>00110         <span class="keywordflow">if</span> ([_invocations[index] target] == aTarget)
<a name="l00111"></a>00111             _invocations.splice(index, 1);
<a name="l00112"></a>00112 }
<a name="l00113"></a>00113 
<a name="l00114"></a>00114 - (<a class="code" href="class_c_p_array.html" title="A mutable array backed by a JavaScript Array.A mutable array class backed by a JavaScript...">CPArray</a>)invocations
<a name="l00115"></a>00115 {
<a name="l00116"></a>00116     <span class="keywordflow">return</span> _invocations;
<a name="l00117"></a>00117 }
<a name="l00118"></a>00118 
<a name="l00119"></a>00119 - (void)invoke
<a name="l00120"></a>00120 {
<a name="l00121"></a>00121     var index = _invocations.length;
<a name="l00122"></a>00122 
<a name="l00123"></a>00123     <span class="keywordflow">while</span> (index--)
<a name="l00124"></a>00124         [_invocations[index] invoke];
<a name="l00125"></a>00125 }
<a name="l00126"></a>00126 
<a name="l00127"></a>00127 <span class="keyword">@end</span>
<a name="l00128"></a>00128 
<a name="l00129"></a>00129 var _CPUndoGroupingParentKey        = <span class="stringliteral">@&quot;_CPUndoGroupingParentKey&quot;</span>,
<a name="l00130"></a>00130     _CPUndoGroupingInvocationsKey   = <span class="stringliteral">@&quot;_CPUndoGroupingInvocationsKey&quot;</span>;
<a name="l00131"></a>00131 
<a name="l00132"></a>00132 <span class="keyword">@implementation </span>_CPUndoGrouping (<a class="code" href="class_c_p_coder.html" title="Defines methods for use when archiving &amp;amp; restoring (enc/decoding).">CPCoder</a>)
<a name="l00133"></a>00133 
<a name="l00134"></a>00134 - (id)initWithCoder:(<a class="code" href="class_c_p_coder.html" title="Defines methods for use when archiving &amp;amp; restoring (enc/decoding).">CPCoder</a>)aCoder
<a name="l00135"></a>00135 {
<a name="l00136"></a>00136     <span class="keyword">self</span> = [<span class="keyword">super</span> init];
<a name="l00137"></a>00137     
<a name="l00138"></a>00138     <span class="keywordflow">if</span> (<span class="keyword">self</span>)
<a name="l00139"></a>00139     {
<a name="l00140"></a>00140         _parent = [aCoder decodeObjectForKey:_CPUndoGroupingParentKey];
<a name="l00141"></a>00141         _invocations = [aCoder decodeObjectForKey:_CPUndoGroupingInvocationsKey];
<a name="l00142"></a>00142     }
<a name="l00143"></a>00143     
<a name="l00144"></a>00144     <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00145"></a>00145 }
<a name="l00146"></a>00146 
<a name="l00147"></a>00147 - (void)encodeWithCoder:(<a class="code" href="class_c_p_coder.html" title="Defines methods for use when archiving &amp;amp; restoring (enc/decoding).">CPCoder</a>)aCoder
<a name="l00148"></a>00148 {
<a name="l00149"></a>00149     [aCoder encodeObject:_parent forKey:_CPUndoGroupingParentKey];
<a name="l00150"></a>00150     [aCoder encodeObject:_invocations forKey:_CPUndoGroupingInvocationsKey];
<a name="l00151"></a>00151 }
<a name="l00152"></a>00152 
<a name="l00153"></a>00153 <span class="keyword">@end</span>
<a name="l00154"></a>00154 
<a name="l00170"></a><a class="code" href="class_c_p_undo_manager.html">00170</a> <span class="keyword">@implementation </span><a class="code" href="class_c_p_undo_manager.html" title="A general mechanism for user action &amp;quot;undo&amp;quot;.">CPUndoManager</a> : <a class="code" href="class_c_p_object.html" title="The root class from which most classes are subclassed.">CPObject</a>
<a name="l00171"></a>00171 {
<a name="l00172"></a>00172     <a class="code" href="class_c_p_mutable_array.html">CPMutableArray</a>  _redoStack;
<a name="l00173"></a>00173     <a class="code" href="class_c_p_mutable_array.html">CPMutableArray</a>  _undoStack;
<a name="l00174"></a>00174 
<a name="l00175"></a>00175     BOOL            _groupsByEvent;
<a name="l00176"></a>00176     <span class="keywordtype">int</span>             _disableCount;
<a name="l00177"></a>00177     <span class="keywordtype">int</span>             _levelsOfUndo;
<a name="l00178"></a>00178     <span class="keywordtype">id</span>              _currentGrouping;
<a name="l00179"></a>00179     <span class="keywordtype">int</span>             _state;
<a name="l00180"></a>00180     <a class="code" href="class_c_p_string.html" title="An immutable string (collection of characters).">CPString</a>        _actionName;
<a name="l00181"></a>00181 
<a name="l00182"></a>00182     <span class="keywordtype">id</span>              _preparedTarget;
<a name="l00183"></a>00183     <span class="keywordtype">id</span>              _undoManagerProxy;
<a name="l00184"></a>00184 
<a name="l00185"></a>00185     <a class="code" href="class_c_p_array.html" title="A mutable array backed by a JavaScript Array.A mutable array class backed by a JavaScript...">CPArray</a>         _runLoopModes;
<a name="l00186"></a>00186     BOOL            _registeredWithRunLoop;
<a name="l00187"></a>00187 }
<a name="l00188"></a>00188 
<a name="l00193"></a><a class="code" href="class_c_p_undo_manager.html#a5c10e31c699aaad0216d07bfa048ae78">00193</a> - (id)init
<a name="l00194"></a>00194 {
<a name="l00195"></a>00195     <span class="keyword">self</span> = [<span class="keyword">super</span> init];
<a name="l00196"></a>00196     
<a name="l00197"></a>00197     <span class="keywordflow">if</span> (<span class="keyword">self</span>)
<a name="l00198"></a>00198     {
<a name="l00199"></a>00199         _redoStack = [];
<a name="l00200"></a>00200         _undoStack = [];
<a name="l00201"></a>00201         
<a name="l00202"></a>00202         _state = <a class="code" href="_c_p_undo_manager_8j.html#a6d4c58cc19ea1d126dc40a9458637aa3">CPUndoManagerNormal</a>;
<a name="l00203"></a>00203         
<a name="l00204"></a>00204         [<span class="keyword">self</span> <a class="code" href="class_c_p_undo_manager.html#aac89a2ae56ce38c011a677fb9ac36e9f">setRunLoopModes</a>:[CPDefaultRunLoopMode]];
<a name="l00205"></a>00205         [<span class="keyword">self</span> <a class="code" href="class_c_p_undo_manager.html#af1d8252a39f2ec6f0dca17187f15e6d7">setGroupsByEvent</a>:YES];
<a name="l00206"></a>00206 
<a name="l00207"></a>00207         _undoManagerProxy = [_CPUndoManagerProxy alloc];
<a name="l00208"></a>00208         _undoManagerProxy._undoManager = <span class="keyword">self</span>;
<a name="l00209"></a>00209     }
<a name="l00210"></a>00210     
<a name="l00211"></a>00211     <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00212"></a>00212 }
<a name="l00213"></a>00213 
<a name="l00214"></a>00214 - (void)_addUndoInvocation:(<a class="code" href="class_c_p_invocation.html" title="An object representation of a message.">CPInvocation</a>)anInvocation
<a name="l00215"></a>00215 {
<a name="l00216"></a>00216     <span class="keywordflow">if</span> (!_currentGrouping)
<a name="l00217"></a>00217         <span class="comment">// Remember that we create these lazily...</span>
<a name="l00218"></a>00218         <span class="keywordflow">if</span> ([<span class="keyword">self</span> groupsByEvent])
<a name="l00219"></a>00219             [<span class="keyword">self</span> _beginUndoGroupingForEvent];
<a name="l00220"></a>00220         <span class="keywordflow">else</span>
<a name="l00221"></a>00221             [<a class="code" href="class_c_p_exception.html" title="Used to implement exception handling (creating &amp;amp; raising).">CPException</a> <a class="code" href="class_c_p_exception.html#ac8f34bd11868822e26a7b952810128b8">raise</a>:CPInternalInconsistencyException <a class="code" href="class_c_p_exception.html#ac8f34bd11868822e26a7b952810128b8">reason</a>:&quot;No undo group is currently open&quot;];
<a name="l00222"></a>00222 
<a name="l00223"></a>00223     [_currentGrouping addInvocation:anInvocation];
<a name="l00224"></a>00224 
<a name="l00225"></a>00225     <span class="keywordflow">if</span> (_state === <a class="code" href="_c_p_undo_manager_8j.html#a6d4c58cc19ea1d126dc40a9458637aa3">CPUndoManagerNormal</a>)
<a name="l00226"></a>00226         [_redoStack removeAllObjects];
<a name="l00227"></a>00227 }
<a name="l00228"></a>00228 
<a name="l00229"></a>00229 <span class="comment">// Registering Undo Operations</span>
<a name="l00237"></a><a class="code" href="class_c_p_undo_manager.html#a6f7eb271e86b308f8a972d9cd6e84f3d">00237</a> <span class="comment"></span>- (void)registerUndoWithTarget:(<span class="keywordtype">id</span>)aTarget selector:(<span class="keywordtype">SEL</span>)aSelector object:(<span class="keywordtype">id</span>)anObject
<a name="l00238"></a>00238 {
<a name="l00239"></a>00239     <span class="comment">// Don&apos;t do anything if we&apos;re disabled.</span>
<a name="l00240"></a>00240     <span class="keywordflow">if</span> (_disableCount &gt; 0)
<a name="l00241"></a>00241         <span class="keywordflow">return</span>;
<a name="l00242"></a>00242 
<a name="l00243"></a>00243     <span class="comment">//signature = [target methodSignatureForSelector:selector];</span>
<a name="l00244"></a>00244     <span class="comment">// FIXME: we need method signatures.</span>
<a name="l00245"></a>00245     var invocation = [<a class="code" href="class_c_p_invocation.html" title="An object representation of a message.">CPInvocation</a> <a class="code" href="class_c_p_invocation.html#a20402bebee4ed442290d998d2a0e0b26">invocationWithMethodSignature</a>:nil];
<a name="l00246"></a>00246 
<a name="l00247"></a>00247     [invocation setTarget:aTarget];
<a name="l00248"></a>00248     [invocation setSelector:aSelector];
<a name="l00249"></a>00249     [invocation setArgument:anObject atIndex:2];
<a name="l00250"></a>00250 
<a name="l00251"></a>00251     [<span class="keyword">self</span> _addUndoInvocation:invocation];
<a name="l00252"></a>00252 }
<a name="l00258"></a><a class="code" href="class_c_p_undo_manager.html#afda2099de67bedf8a3e75a8ce128633f">00258</a> - (id)prepareWithInvocationTarget:(<span class="keywordtype">id</span>)aTarget
<a name="l00259"></a>00259 {
<a name="l00260"></a>00260     _preparedTarget = aTarget;
<a name="l00261"></a>00261     
<a name="l00262"></a>00262     <span class="keywordflow">return</span> _undoManagerProxy;
<a name="l00263"></a>00263 }
<a name="l00264"></a>00264 
<a name="l00265"></a>00265 <span class="comment">/*</span>
<a name="l00266"></a>00266 <span class="comment">    FIXME This method doesn&apos;t seem to do anything right</span>
<a name="l00267"></a>00267 <span class="comment">    @ignore</span>
<a name="l00268"></a>00268 <span class="comment">*/</span>
<a name="l00269"></a>00269 - (CPMethodSignature)_methodSignatureOfPreparedTargetForSelector:(<span class="keywordtype">SEL</span>)aSelector
<a name="l00270"></a>00270 {
<a name="l00271"></a>00271     <span class="keywordflow">if</span> ([_preparedTarget respondsToSelector:aSelector])
<a name="l00272"></a>00272         <span class="keywordflow">return</span> 1;
<a name="l00273"></a>00273     
<a name="l00274"></a>00274     <span class="keywordflow">return</span> nil;<span class="comment">//[_preparedTarget methodSignatureForSelector:selector];</span>
<a name="l00275"></a>00275 }
<a name="l00276"></a>00276 
<a name="l00282"></a>00282 - (void)_forwardInvocationToPreparedTarget:(<a class="code" href="class_c_p_invocation.html" title="An object representation of a message.">CPInvocation</a>)anInvocation
<a name="l00283"></a>00283 {
<a name="l00284"></a>00284     <span class="comment">// Don&apos;t do anything if we&apos;re disabled.</span>
<a name="l00285"></a>00285     <span class="keywordflow">if</span> (_disableCount &gt; 0)
<a name="l00286"></a>00286         <span class="keywordflow">return</span>;
<a name="l00287"></a>00287 
<a name="l00288"></a>00288 <span class="comment">/*</span>
<a name="l00289"></a>00289 <span class="comment">if (_currentGroup == nil)</span>
<a name="l00290"></a>00290 <span class="comment">        [NSException raise:NSInternalInconsistencyException</span>
<a name="l00291"></a>00291 <span class="comment">                    format:@&quot;forwardInvocation called without first opening an undo group&quot;];</span>
<a name="l00292"></a>00292 <span class="comment">*/</span>
<a name="l00293"></a>00293     [anInvocation <a class="code" href="class_c_p_invocation.html#a341b8894e4f34e4f055c516ea8ca1fea">setTarget</a>:_preparedTarget];
<a name="l00294"></a>00294 
<a name="l00295"></a>00295     [<span class="keyword">self</span> _addUndoInvocation:anInvocation];
<a name="l00296"></a>00296 
<a name="l00297"></a>00297     _preparedTarget = nil;
<a name="l00298"></a>00298 }
<a name="l00299"></a>00299 
<a name="l00300"></a>00300 <span class="comment">// Checking Undo Ability</span>
<a name="l00304"></a><a class="code" href="class_c_p_undo_manager.html#aa95000c40b5bf973564422aa2c3113a3">00304</a> <span class="comment"></span>- (BOOL)canRedo
<a name="l00305"></a>00305 {
<a name="l00306"></a>00306     [[<a class="code" href="class_c_p_notification_center.html" title="Sends messages (CPNotification) between objects.">CPNotificationCenter</a> <a class="code" href="class_c_p_notification_center.html#a5abe725f1a1a48ac4cb1e45b6d9d50a8">defaultCenter</a>]
<a name="l00307"></a>00307         <a class="code" href="class_c_p_notification_center.html#ac9402b295db607cbd92ae56bce50b37f">postNotificationName</a>:CPUndoManagerCheckpointNotification
<a name="l00308"></a>00308                       <a class="code" href="class_c_p_notification_center.html#ac9402b295db607cbd92ae56bce50b37f">object</a>:self];
<a name="l00309"></a>00309 
<a name="l00310"></a>00310     <span class="keywordflow">return</span> [_redoStack count] &gt; 0;
<a name="l00311"></a>00311 }
<a name="l00312"></a>00312 
<a name="l00316"></a><a class="code" href="class_c_p_undo_manager.html#a5a4d51d2808bbeec3de73bc5f17a4f8e">00316</a> - (BOOL)canUndo
<a name="l00317"></a>00317 {
<a name="l00318"></a>00318     <span class="keywordflow">if</span> (_undoStack.length &gt; 0)
<a name="l00319"></a>00319         <span class="keywordflow">return</span> YES;
<a name="l00320"></a>00320     
<a name="l00321"></a>00321     <span class="keywordflow">return</span> [_currentGrouping actions].length &gt; 0;
<a name="l00322"></a>00322 }
<a name="l00323"></a>00323 
<a name="l00324"></a>00324 <span class="comment">// Preform Undo and Redo</span>
<a name="l00328"></a><a class="code" href="class_c_p_undo_manager.html#a8461cff7f94960cdd44d704236db0d3b">00328</a> <span class="comment"></span>- (void)undo
<a name="l00329"></a>00329 {
<a name="l00330"></a>00330     <span class="keywordflow">if</span> ([<span class="keyword">self</span> groupingLevel] === 1)
<a name="l00331"></a>00331         [<span class="keyword">self</span> <a class="code" href="class_c_p_undo_manager.html#ac49120debe2177f67b5c822c48f14657">endUndoGrouping</a>];
<a name="l00332"></a>00332 
<a name="l00333"></a>00333     [<span class="keyword">self</span> <a class="code" href="class_c_p_undo_manager.html#aa8caf4c7852b9dac05c707c7b13c53fc">undoNestedGroup</a>];
<a name="l00334"></a>00334 }
<a name="l00335"></a>00335 
<a name="l00339"></a><a class="code" href="class_c_p_undo_manager.html#aa8caf4c7852b9dac05c707c7b13c53fc">00339</a> - (void)undoNestedGroup
<a name="l00340"></a>00340 { 
<a name="l00341"></a>00341     <span class="keywordflow">if</span> ([_undoStack count] &lt;= 0)
<a name="l00342"></a>00342         <span class="keywordflow">return</span>;
<a name="l00343"></a>00343 
<a name="l00344"></a>00344     var defaultCenter = [<a class="code" href="class_c_p_notification_center.html" title="Sends messages (CPNotification) between objects.">CPNotificationCenter</a> <a class="code" href="class_c_p_notification_center.html#a5abe725f1a1a48ac4cb1e45b6d9d50a8">defaultCenter</a>];
<a name="l00345"></a>00345 
<a name="l00346"></a>00346     [defaultCenter postNotificationName:CPUndoManagerCheckpointNotification
<a name="l00347"></a>00347                                  object:self];
<a name="l00348"></a>00348 
<a name="l00349"></a>00349     [defaultCenter postNotificationName:CPUndoManagerWillUndoChangeNotification
<a name="l00350"></a>00350                                  object:self];
<a name="l00351"></a>00351 
<a name="l00352"></a>00352     var undoGrouping = _undoStack.pop();
<a name="l00353"></a>00353 
<a name="l00354"></a>00354     _state = <a class="code" href="_c_p_undo_manager_8j.html#aaad25405c75ea3c461633b915b8580a9">CPUndoManagerUndoing</a>;
<a name="l00355"></a>00355 
<a name="l00356"></a>00356     [<span class="keyword">self</span> _beginUndoGrouping];
<a name="l00357"></a>00357     [undoGrouping invoke];
<a name="l00358"></a>00358     [<span class="keyword">self</span> <a class="code" href="class_c_p_undo_manager.html#ac49120debe2177f67b5c822c48f14657">endUndoGrouping</a>];
<a name="l00359"></a>00359 
<a name="l00360"></a>00360     [_CPUndoGrouping _poolUndoGrouping:undoGrouping];
<a name="l00361"></a>00361 
<a name="l00362"></a>00362     _state = <a class="code" href="_c_p_undo_manager_8j.html#a6d4c58cc19ea1d126dc40a9458637aa3">CPUndoManagerNormal</a>;
<a name="l00363"></a>00363 
<a name="l00364"></a>00364     [defaultCenter postNotificationName:CPUndoManagerDidUndoChangeNotification
<a name="l00365"></a>00365                                  object:self];
<a name="l00366"></a>00366 }
<a name="l00367"></a>00367 
<a name="l00371"></a><a class="code" href="class_c_p_undo_manager.html#ac15a928a1dc50cb5d192bb5dc20af01f">00371</a> - (void)redo
<a name="l00372"></a>00372 {
<a name="l00373"></a>00373     <span class="comment">// Don&apos;t do anything if we have no redos.</span>
<a name="l00374"></a>00374     <span class="keywordflow">if</span> ([_redoStack count] &lt;= 0)
<a name="l00375"></a>00375         <span class="keywordflow">return</span>;
<a name="l00376"></a>00376     
<a name="l00377"></a>00377 <span class="comment">/*    if (_state == NSUndoManagerUndoing)</span>
<a name="l00378"></a>00378 <span class="comment">        [NSException raise:NSInternalInconsistencyException</span>
<a name="l00379"></a>00379 <span class="comment">                    format:@&quot;redo called while undoing&quot;];</span>
<a name="l00380"></a>00380 <span class="comment">*/</span>
<a name="l00381"></a>00381 
<a name="l00382"></a>00382     var defaultCenter = [<a class="code" href="class_c_p_notification_center.html" title="Sends messages (CPNotification) between objects.">CPNotificationCenter</a> <a class="code" href="class_c_p_notification_center.html#a5abe725f1a1a48ac4cb1e45b6d9d50a8">defaultCenter</a>];
<a name="l00383"></a>00383 
<a name="l00384"></a>00384     [defaultCenter postNotificationName:CPUndoManagerCheckpointNotification
<a name="l00385"></a>00385                                  object:self];
<a name="l00386"></a>00386 
<a name="l00387"></a>00387     [defaultCenter postNotificationName:CPUndoManagerWillRedoChangeNotification
<a name="l00388"></a>00388                                  object:self];
<a name="l00389"></a>00389     
<a name="l00390"></a>00390     var oldUndoGrouping = _currentGrouping,
<a name="l00391"></a>00391         undoGrouping = _redoStack.pop();
<a name="l00392"></a>00392     
<a name="l00393"></a>00393     _currentGrouping = nil;
<a name="l00394"></a>00394     _state = <a class="code" href="_c_p_undo_manager_8j.html#ad5a4e307fcd13b1c8d87de9208c374dc">CPUndoManagerRedoing</a>;
<a name="l00395"></a>00395 
<a name="l00396"></a>00396     [<span class="keyword">self</span> _beginUndoGrouping];
<a name="l00397"></a>00397     [undoGrouping invoke];
<a name="l00398"></a>00398     [<span class="keyword">self</span> <a class="code" href="class_c_p_undo_manager.html#ac49120debe2177f67b5c822c48f14657">endUndoGrouping</a>];
<a name="l00399"></a>00399     
<a name="l00400"></a>00400     [_CPUndoGrouping _poolUndoGrouping:undoGrouping];
<a name="l00401"></a>00401     
<a name="l00402"></a>00402     _currentGrouping = oldUndoGrouping;
<a name="l00403"></a>00403     _state = <a class="code" href="_c_p_undo_manager_8j.html#a6d4c58cc19ea1d126dc40a9458637aa3">CPUndoManagerNormal</a>;
<a name="l00404"></a>00404 
<a name="l00405"></a>00405     [defaultCenter postNotificationName:CPUndoManagerDidRedoChangeNotification object:self];
<a name="l00406"></a>00406 }
<a name="l00407"></a>00407 
<a name="l00408"></a>00408 <span class="comment">// Creating Undo Groups</span>
<a name="l00412"></a><a class="code" href="class_c_p_undo_manager.html#aa4d30489ad433b09ab20637c71261a48">00412</a> <span class="comment"></span>- (void)beginUndoGrouping
<a name="l00413"></a>00413 {
<a name="l00414"></a>00414     <span class="comment">// It doesn&apos;t matter that the user is creating a group themselves, we are</span>
<a name="l00415"></a>00415     <span class="comment">// pretending to have opened the group at the beginning of the run loop,</span>
<a name="l00416"></a>00416     <span class="comment">// so create an implicit one here.</span>
<a name="l00417"></a>00417     <span class="keywordflow">if</span> (!_currentGrouping &amp;&amp; [<span class="keyword">self</span> groupsByEvent])
<a name="l00418"></a>00418         [<span class="keyword">self</span> _beginUndoGroupingForEvent];
<a name="l00419"></a>00419 
<a name="l00420"></a>00420     [[<a class="code" href="class_c_p_notification_center.html" title="Sends messages (CPNotification) between objects.">CPNotificationCenter</a> <a class="code" href="class_c_p_notification_center.html#a5abe725f1a1a48ac4cb1e45b6d9d50a8">defaultCenter</a>]
<a name="l00421"></a>00421         <a class="code" href="class_c_p_notification_center.html#ac9402b295db607cbd92ae56bce50b37f">postNotificationName</a>:CPUndoManagerCheckpointNotification
<a name="l00422"></a>00422                       <a class="code" href="class_c_p_notification_center.html#ac9402b295db607cbd92ae56bce50b37f">object</a>:self];
<a name="l00423"></a>00423 
<a name="l00424"></a>00424     [<span class="keyword">self</span> _beginUndoGrouping];
<a name="l00425"></a>00425 }
<a name="l00426"></a>00426 
<a name="l00427"></a>00427 <span class="comment">/* @ignore */</span>
<a name="l00428"></a>00428 - (void)_beginUndoGroupingForEvent
<a name="l00429"></a>00429 {
<a name="l00430"></a>00430     [<span class="keyword">self</span> _beginUndoGrouping];
<a name="l00431"></a>00431     [<span class="keyword">self</span> _registerWithRunLoop];
<a name="l00432"></a>00432 }
<a name="l00433"></a>00433 
<a name="l00434"></a>00434 <span class="comment">/* @ignore */</span>
<a name="l00435"></a>00435 - (void)_beginUndoGrouping
<a name="l00436"></a>00436 {
<a name="l00437"></a>00437     _currentGrouping = [_CPUndoGrouping undoGroupingWithParent:_currentGrouping];
<a name="l00438"></a>00438 }
<a name="l00439"></a>00439 
<a name="l00444"></a><a class="code" href="class_c_p_undo_manager.html#ac49120debe2177f67b5c822c48f14657">00444</a> - (void)endUndoGrouping
<a name="l00445"></a>00445 {
<a name="l00446"></a>00446     <span class="keywordflow">if</span> (!_currentGrouping)
<a name="l00447"></a>00447         [<a class="code" href="class_c_p_exception.html" title="Used to implement exception handling (creating &amp;amp; raising).">CPException</a> <a class="code" href="class_c_p_exception.html#ac8f34bd11868822e26a7b952810128b8">raise</a>:CPInternalInconsistencyException <a class="code" href="class_c_p_exception.html#ac8f34bd11868822e26a7b952810128b8">reason</a>:&quot;endUndoGrouping. No undo group is currently open.&quot;];
<a name="l00448"></a>00448 
<a name="l00449"></a>00449     var defaultCenter = [<a class="code" href="class_c_p_notification_center.html" title="Sends messages (CPNotification) between objects.">CPNotificationCenter</a> <a class="code" href="class_c_p_notification_center.html#a5abe725f1a1a48ac4cb1e45b6d9d50a8">defaultCenter</a>];
<a name="l00450"></a>00450 
<a name="l00451"></a>00451     [defaultCenter postNotificationName:CPUndoManagerCheckpointNotification
<a name="l00452"></a>00452                                  object:self];
<a name="l00453"></a>00453 
<a name="l00454"></a>00454     var parent = [_currentGrouping parent];
<a name="l00455"></a>00455     
<a name="l00456"></a>00456     <span class="keywordflow">if</span> (!parent &amp;&amp; [_currentGrouping invocations].length &gt; 0)
<a name="l00457"></a>00457     {
<a name="l00458"></a>00458         [defaultCenter
<a name="l00459"></a>00459             postNotificationName:CPUndoManagerWillCloseUndoGroupNotification
<a name="l00460"></a>00460                           object:self];
<a name="l00461"></a>00461                               
<a name="l00462"></a>00462         <span class="comment">// Put this group on the redo stack if we are currently undoing, otherwise</span>
<a name="l00463"></a>00463         <span class="comment">// put it on the undo stack.  That way, &quot;undos&quot; become &quot;redos&quot;.</span>
<a name="l00464"></a>00464         var stack = _state === <a class="code" href="_c_p_undo_manager_8j.html#aaad25405c75ea3c461633b915b8580a9">CPUndoManagerUndoing</a> ? _redoStack : _undoStack;
<a name="l00465"></a>00465         
<a name="l00466"></a>00466         stack.push(_currentGrouping);
<a name="l00467"></a>00467     
<a name="l00468"></a>00468         <span class="keywordflow">if</span> (_levelsOfUndo &gt; 0 &amp;&amp; stack.length &gt; _levelsOfUndo)
<a name="l00469"></a>00469             stack.splice(0, 1);        
<a name="l00470"></a>00470     }
<a name="l00471"></a>00471     
<a name="l00472"></a>00472     <span class="comment">// Nested Undo Grouping</span>
<a name="l00473"></a>00473     <span class="keywordflow">else</span>
<a name="l00474"></a>00474     {
<a name="l00475"></a>00475         [parent addInvocationsFromArray:[_currentGrouping invocations]];
<a name="l00476"></a>00476         
<a name="l00477"></a>00477         [_CPUndoGrouping _poolUndoGrouping:_currentGrouping];
<a name="l00478"></a>00478     }
<a name="l00479"></a>00479     
<a name="l00480"></a>00480     _currentGrouping = parent;
<a name="l00481"></a>00481 }
<a name="l00482"></a>00482 
<a name="l00489"></a><a class="code" href="class_c_p_undo_manager.html#afe13d54edbe58a3f2ca9c134ffa14e3f">00489</a> - (void)enableUndoRegistration
<a name="l00490"></a>00490 {
<a name="l00491"></a>00491     <span class="keywordflow">if</span> (_disableCount &lt;= 0)
<a name="l00492"></a>00492         [<a class="code" href="class_c_p_exception.html" title="Used to implement exception handling (creating &amp;amp; raising).">CPException</a> <a class="code" href="class_c_p_exception.html#ac8f34bd11868822e26a7b952810128b8">raise</a>:CPInternalInconsistencyException
<a name="l00493"></a>00493                     <a class="code" href="class_c_p_exception.html#ac8f34bd11868822e26a7b952810128b8">reason</a>:&quot;enableUndoRegistration. There are no disable messages in effect right now.&quot;];
<a name="l00494"></a>00494         
<a name="l00495"></a>00495     _disableCount--;
<a name="l00496"></a>00496 }
<a name="l00497"></a>00497 
<a name="l00501"></a><a class="code" href="class_c_p_undo_manager.html#abf7c504ba2471ce1e9d89881af690ea8">00501</a> - (BOOL)groupsByEvent
<a name="l00502"></a>00502 {
<a name="l00503"></a>00503     <span class="keywordflow">return</span> _groupsByEvent;
<a name="l00504"></a>00504 }
<a name="l00505"></a>00505 
<a name="l00510"></a><a class="code" href="class_c_p_undo_manager.html#af1d8252a39f2ec6f0dca17187f15e6d7">00510</a> - (void)setGroupsByEvent:(BOOL)aFlag
<a name="l00511"></a>00511 {
<a name="l00512"></a>00512     aFlag = !!aFlag;
<a name="l00513"></a>00513 
<a name="l00514"></a>00514     <span class="keywordflow">if</span> (_groupsByEvent === aFlag)
<a name="l00515"></a>00515         <span class="keywordflow">return</span>;
<a name="l00516"></a>00516 
<a name="l00517"></a>00517     _groupsByEvent = aFlag;
<a name="l00518"></a>00518 
<a name="l00519"></a>00519     <span class="keywordflow">if</span> (![<span class="keyword">self</span> groupsByEvent])
<a name="l00520"></a>00520         [<span class="keyword">self</span> _unregisterWithRunLoop];
<a name="l00521"></a>00521 }
<a name="l00522"></a>00522 
<a name="l00526"></a><a class="code" href="class_c_p_undo_manager.html#a4c3a377f09c0cf9e98b0679e680ccaa4">00526</a> - (unsigned)groupingLevel
<a name="l00527"></a>00527 {
<a name="l00528"></a>00528     var grouping = _currentGrouping,
<a name="l00529"></a>00529         level = _currentGrouping != nil;
<a name="l00530"></a>00530     
<a name="l00531"></a>00531     <span class="keywordflow">while</span> (grouping = [grouping parent])
<a name="l00532"></a>00532         ++level;
<a name="l00533"></a>00533     
<a name="l00534"></a>00534     <span class="keywordflow">return</span> level;
<a name="l00535"></a>00535 }
<a name="l00536"></a>00536 
<a name="l00537"></a>00537 <span class="comment">// Disabling Undo</span>
<a name="l00541"></a><a class="code" href="class_c_p_undo_manager.html#a0979cd7af7a4e1c64ef7aa8c553b43c2">00541</a> <span class="comment"></span>- (void)disableUndoRegistration
<a name="l00542"></a>00542 {
<a name="l00543"></a>00543     ++_disableCount;
<a name="l00544"></a>00544 }
<a name="l00545"></a>00545 
<a name="l00549"></a><a class="code" href="class_c_p_undo_manager.html#ae72531cc6abebfafa8134b8ec47dc09c">00549</a> - (BOOL)isUndoRegistrationEnabled
<a name="l00550"></a>00550 {
<a name="l00551"></a>00551     <span class="keywordflow">return</span> _disableCount == 0;
<a name="l00552"></a>00552 }
<a name="l00553"></a>00553 
<a name="l00554"></a>00554 <span class="comment">// Checking Whether Undo or Redo Is Being Performed</span>
<a name="l00558"></a><a class="code" href="class_c_p_undo_manager.html#a16aa42115baea4d0f193d86817afccc5">00558</a> <span class="comment"></span>- (BOOL)isUndoing
<a name="l00559"></a>00559 {
<a name="l00560"></a>00560     <span class="keywordflow">return</span> _state === <a class="code" href="_c_p_undo_manager_8j.html#aaad25405c75ea3c461633b915b8580a9">CPUndoManagerUndoing</a>;
<a name="l00561"></a>00561 }
<a name="l00562"></a>00562 
<a name="l00566"></a><a class="code" href="class_c_p_undo_manager.html#a7eb97b135068c9980eb773d11faaefdf">00566</a> - (BOOL)isRedoing
<a name="l00567"></a>00567 {
<a name="l00568"></a>00568     <span class="keywordflow">return</span> _state === <a class="code" href="_c_p_undo_manager_8j.html#ad5a4e307fcd13b1c8d87de9208c374dc">CPUndoManagerRedoing</a>;
<a name="l00569"></a>00569 }
<a name="l00570"></a>00570 
<a name="l00571"></a>00571 <span class="comment">// Clearing Undo Operations</span>
<a name="l00575"></a><a class="code" href="class_c_p_undo_manager.html#ab88f9690bcd20ec3fa56274d4775f960">00575</a> <span class="comment"></span>- (void)removeAllActions
<a name="l00576"></a>00576 {
<a name="l00577"></a>00577     _redoStack = [];
<a name="l00578"></a>00578     _undoStack = [];
<a name="l00579"></a>00579     _disableCount = 0;
<a name="l00580"></a>00580 }
<a name="l00581"></a>00581 
<a name="l00586"></a><a class="code" href="class_c_p_undo_manager.html#add722ccb9a10f5fa9e73c8b0dc5695da">00586</a> - (void)removeAllActionsWithTarget:(<span class="keywordtype">id</span>)aTarget
<a name="l00587"></a>00587 {
<a name="l00588"></a>00588     [_currentGrouping removeInvocationsWithTarget:aTarget];
<a name="l00589"></a>00589     
<a name="l00590"></a>00590     var index = _redoStack.length;
<a name="l00591"></a>00591     
<a name="l00592"></a>00592     <span class="keywordflow">while</span> (index--)
<a name="l00593"></a>00593     {
<a name="l00594"></a>00594         var grouping = _redoStack[index];
<a name="l00595"></a>00595         
<a name="l00596"></a>00596         [grouping removeInvocationsWithTarget:aTarget];
<a name="l00597"></a>00597         
<a name="l00598"></a>00598         <span class="keywordflow">if</span> (![grouping invocations].length)
<a name="l00599"></a>00599             _redoStack.splice(index, 1);
<a name="l00600"></a>00600     }
<a name="l00601"></a>00601 
<a name="l00602"></a>00602     index = _undoStack.length;
<a name="l00603"></a>00603     
<a name="l00604"></a>00604     <span class="keywordflow">while</span> (index--)
<a name="l00605"></a>00605     {
<a name="l00606"></a>00606         var grouping = _undoStack[index];
<a name="l00607"></a>00607         
<a name="l00608"></a>00608         [grouping removeInvocationsWithTarget:aTarget];
<a name="l00609"></a>00609         
<a name="l00610"></a>00610         <span class="keywordflow">if</span> (![grouping invocations].length)
<a name="l00611"></a>00611             _undoStack.splice(index, 1);
<a name="l00612"></a>00612     }
<a name="l00613"></a>00613 }
<a name="l00614"></a>00614 
<a name="l00615"></a>00615 <span class="comment">// Managing the Action Name</span>
<a name="l00621"></a><a class="code" href="class_c_p_undo_manager.html#a143ea92df9368bb31fd92d993e0ae2c5">00621</a> <span class="comment"></span>- (void)setActionName:(<a class="code" href="class_c_p_string.html" title="An immutable string (collection of characters).">CPString</a>)anActionName
<a name="l00622"></a>00622 {
<a name="l00623"></a>00623     _actionName = anActionName;
<a name="l00624"></a>00624 }
<a name="l00625"></a>00625 
<a name="l00632"></a><a class="code" href="class_c_p_undo_manager.html#a65f6e3df36b2cc2fd462961f68b983ef">00632</a> - (<a class="code" href="class_c_p_string.html" title="An immutable string (collection of characters).">CPString</a>)redoActionName
<a name="l00633"></a>00633 {
<a name="l00634"></a>00634     <span class="keywordflow">return</span> [<span class="keyword">self</span> <a class="code" href="class_c_p_undo_manager.html#aa95000c40b5bf973564422aa2c3113a3">canRedo</a>] ? _actionName : nil;
<a name="l00635"></a>00635 }
<a name="l00636"></a>00636 
<a name="l00643"></a><a class="code" href="class_c_p_undo_manager.html#a3841242891fc00a0cf47bf96b5126fa1">00643</a> - (<a class="code" href="class_c_p_string.html" title="An immutable string (collection of characters).">CPString</a>)undoActionName
<a name="l00644"></a>00644 {
<a name="l00645"></a>00645     <span class="keywordflow">return</span> [<span class="keyword">self</span> <a class="code" href="class_c_p_undo_manager.html#a5a4d51d2808bbeec3de73bc5f17a4f8e">canUndo</a>] ? _actionName : nil;
<a name="l00646"></a>00646 }
<a name="l00647"></a>00647 
<a name="l00648"></a>00648 <span class="comment">// Working With Run Loops</span>
<a name="l00653"></a><a class="code" href="class_c_p_undo_manager.html#a85e28acfaab288d473028367781b24a4">00653</a> <span class="comment"></span>- (<a class="code" href="class_c_p_array.html" title="A mutable array backed by a JavaScript Array.A mutable array class backed by a JavaScript...">CPArray</a>)runLoopModes
<a name="l00654"></a>00654 {
<a name="l00655"></a>00655     <span class="keywordflow">return</span> _runLoopModes;
<a name="l00656"></a>00656 }
<a name="l00657"></a>00657 
<a name="l00666"></a><a class="code" href="class_c_p_undo_manager.html#aac89a2ae56ce38c011a677fb9ac36e9f">00666</a> - (void)setRunLoopModes:(<a class="code" href="class_c_p_array.html" title="A mutable array backed by a JavaScript Array.A mutable array class backed by a JavaScript...">CPArray</a>)modes
<a name="l00667"></a>00667 {
<a name="l00668"></a>00668     _runLoopModes = [modes <a class="code" href="class_c_p_array.html#a42447f9f646fd3ccf93c4fe864bcbd81">copy</a>];
<a name="l00669"></a>00669 
<a name="l00670"></a>00670     <span class="keywordflow">if</span> (_registeredWithRunLoop)
<a name="l00671"></a>00671     {
<a name="l00672"></a>00672         [<span class="keyword">self</span> _unregisterWithRunLoop];
<a name="l00673"></a>00673         [<span class="keyword">self</span> _registerWithRunLoop];
<a name="l00674"></a>00674     }
<a name="l00675"></a>00675 }
<a name="l00676"></a>00676 
<a name="l00677"></a>00677 - (void)_runLoopEndUndoGrouping
<a name="l00678"></a>00678 {
<a name="l00679"></a>00679     [<span class="keyword">self</span> endUndoGrouping];
<a name="l00680"></a>00680     _registeredWithRunLoop = NO;
<a name="l00681"></a>00681 }
<a name="l00682"></a>00682 
<a name="l00683"></a>00683 <span class="comment">/* @ignore */</span>
<a name="l00684"></a>00684 - (void)_registerWithRunLoop
<a name="l00685"></a>00685 {
<a name="l00686"></a>00686     <span class="keywordflow">if</span> (_registeredWithRunLoop)
<a name="l00687"></a>00687         <span class="keywordflow">return</span>;
<a name="l00688"></a>00688 
<a name="l00689"></a>00689     _registeredWithRunLoop = YES;
<a name="l00690"></a>00690     [[<a class="code" href="class_c_p_run_loop.html" title="The main run loop for the application.">CPRunLoop</a> <a class="code" href="class_c_p_run_loop.html#aba93f1cef957bad4353ce060981c0b9d">currentRunLoop</a>]
<a name="l00691"></a>00691         <a class="code" href="class_c_p_run_loop.html#a2b3b2247377a11043079b7949523156e">performSelector</a>:@selector(_runLoopEndUndoGrouping)
<a name="l00692"></a>00692                  <a class="code" href="class_c_p_run_loop.html#a2b3b2247377a11043079b7949523156e">target</a>:self
<a name="l00693"></a>00693                <a class="code" href="class_c_p_run_loop.html#a2b3b2247377a11043079b7949523156e">argument</a>:nil
<a name="l00694"></a>00694                   <a class="code" href="class_c_p_run_loop.html#a2b3b2247377a11043079b7949523156e">order</a>:CPUndoCloseGroupingRunLoopOrdering
<a name="l00695"></a>00695                   <a class="code" href="class_c_p_run_loop.html#a2b3b2247377a11043079b7949523156e">modes</a>:_runLoopModes];
<a name="l00696"></a>00696 }
<a name="l00697"></a>00697 
<a name="l00698"></a>00698 <span class="comment">/* @ignore */</span>
<a name="l00699"></a>00699 - (void)_unregisterWithRunLoop
<a name="l00700"></a>00700 {
<a name="l00701"></a>00701     <span class="keywordflow">if</span> (!_registeredWithRunLoop)
<a name="l00702"></a>00702         <span class="keywordflow">return</span>;
<a name="l00703"></a>00703 
<a name="l00704"></a>00704     _registeredWithRunLoop = NO;
<a name="l00705"></a>00705     [[<a class="code" href="class_c_p_run_loop.html" title="The main run loop for the application.">CPRunLoop</a> <a class="code" href="class_c_p_run_loop.html#aba93f1cef957bad4353ce060981c0b9d">currentRunLoop</a>]
<a name="l00706"></a>00706         <a class="code" href="class_c_p_run_loop.html#ae134cf7a94255ee21c385669a8321e7c">cancelPerformSelector</a>:@selector(_runLoopEndUndoGrouping)
<a name="l00707"></a>00707                        <a class="code" href="class_c_p_run_loop.html#ae134cf7a94255ee21c385669a8321e7c">target</a>:self
<a name="l00708"></a>00708                      <a class="code" href="class_c_p_run_loop.html#ae134cf7a94255ee21c385669a8321e7c">argument</a>:nil];
<a name="l00709"></a>00709 }
<a name="l00710"></a>00710 
<a name="l00711"></a><a class="code" href="class_c_p_undo_manager.html#ac213940733e724fc57f01af5625ca689">00711</a> - (void)observeChangesForKeyPath:(<a class="code" href="class_c_p_string.html" title="An immutable string (collection of characters).">CPString</a>)aKeyPath ofObject:(<span class="keywordtype">id</span>)anObject
<a name="l00712"></a>00712 {
<a name="l00713"></a>00713     [anObject addObserver:self
<a name="l00714"></a>00714               forKeyPath:aKeyPath
<a name="l00715"></a>00715                  options:CPKeyValueObservingOptionOld | CPKeyValueObservingOptionNew
<a name="l00716"></a>00716                  context:NULL];
<a name="l00717"></a>00717 }
<a name="l00718"></a>00718 
<a name="l00719"></a><a class="code" href="class_c_p_undo_manager.html#af6d0973dd061f1c69877ddb02d5d8485">00719</a> - (void)stopObservingChangesForKeyPath:(<a class="code" href="class_c_p_string.html" title="An immutable string (collection of characters).">CPString</a>)aKeyPath ofObject:(<span class="keywordtype">id</span>)anObject
<a name="l00720"></a>00720 {
<a name="l00721"></a>00721     [anObject removeObserver:self forKeyPath:aKeyPath];
<a name="l00722"></a>00722 }
<a name="l00723"></a>00723 
<a name="l00724"></a><a class="code" href="class_c_p_undo_manager.html#a1c7233d21b76b099ecef59ad6960732d">00724</a> - (void)observeValueForKeyPath:(<a class="code" href="class_c_p_string.html" title="An immutable string (collection of characters).">CPString</a>)aKeyPath
<a name="l00725"></a>00725                       ofObject:(<span class="keywordtype">id</span>)anObject
<a name="l00726"></a>00726                         change:(<a class="code" href="class_c_p_dictionary.html" title="A mutable key-value pair collection.">CPDictionary</a>)aChange
<a name="l00727"></a>00727                        context:(<span class="keywordtype">id</span>)aContext
<a name="l00728"></a>00728 {
<a name="l00729"></a>00729     [[<span class="keyword">self</span> <a class="code" href="class_c_p_undo_manager.html#afda2099de67bedf8a3e75a8ce128633f">prepareWithInvocationTarget</a>:anObject]
<a name="l00730"></a>00730         <a class="code" href="class_c_p_object.html#a1f95c4c7c21ecbb654d77fe40ef569e5">applyChange</a>:[aChange <a class="code" href="class_c_p_dictionary.html#ac8799d0819f746fa6fd616d4eb09f788">inverseChangeDictionary</a>]
<a name="l00731"></a>00731           toKeyPath:aKeyPath];
<a name="l00732"></a>00732 }
<a name="l00733"></a>00733 
<a name="l00734"></a>00734 <span class="keyword">@end</span>
<a name="l00735"></a>00735 
<a name="l00736"></a><a class="code" href="_c_p_undo_manager_8j.html#ac9b814ef3588561040a6e45edf54bebd">00736</a> var <a class="code" href="_c_p_undo_manager_8j.html#ac9b814ef3588561040a6e45edf54bebd">CPUndoManagerRedoStackKey</a>       = <span class="stringliteral">@&quot;CPUndoManagerRedoStackKey&quot;</span>,
<a name="l00737"></a><a class="code" href="_c_p_undo_manager_8j.html#a3d032540fd77975f742e1234fb1c2558">00737</a>     <a class="code" href="_c_p_undo_manager_8j.html#a3d032540fd77975f742e1234fb1c2558">CPUndoManagerUndoStackKey</a>       = <span class="stringliteral">@&quot;CPUndoManagerUndoStackKey&quot;</span>;
<a name="l00738"></a>00738 
<a name="l00739"></a><a class="code" href="_c_p_undo_manager_8j.html#a990cbb45694d6247a21e36eab9d1406a">00739</a>     <a class="code" href="_c_p_undo_manager_8j.html#a990cbb45694d6247a21e36eab9d1406a">CPUndoManagerLevelsOfUndoKey</a>    = <span class="stringliteral">@&quot;CPUndoManagerLevelsOfUndoKey&quot;</span>;
<a name="l00740"></a><a class="code" href="_c_p_undo_manager_8j.html#affeb8cc84ace6412fa6ddb98ea2bdf35">00740</a>     <a class="code" href="_c_p_undo_manager_8j.html#affeb8cc84ace6412fa6ddb98ea2bdf35">CPUndoManagerActionNameKey</a>      = <span class="stringliteral">@&quot;CPUndoManagerActionNameKey&quot;</span>;
<a name="l00741"></a><a class="code" href="_c_p_undo_manager_8j.html#a7ca9ea54175879769cf6e551b2f66b79">00741</a>     <a class="code" href="_c_p_undo_manager_8j.html#a7ca9ea54175879769cf6e551b2f66b79">CPUndoManagerCurrentGroupingKey</a> = <span class="stringliteral">@&quot;CPUndoManagerCurrentGroupingKey&quot;</span>;
<a name="l00742"></a>00742     
<a name="l00743"></a><a class="code" href="_c_p_undo_manager_8j.html#a6b7ff9743e7e7f389b6c6ff351c19f29">00743</a>     <a class="code" href="_c_p_undo_manager_8j.html#a6b7ff9743e7e7f389b6c6ff351c19f29">CPUndoManagerRunLoopModesKey</a>    = <span class="stringliteral">@&quot;CPUndoManagerRunLoopModesKey&quot;</span>;
<a name="l00744"></a><a class="code" href="_c_p_undo_manager_8j.html#af3d76aeb6f1ac36ec0b1a9b98950d9ff">00744</a>     <a class="code" href="_c_p_undo_manager_8j.html#af3d76aeb6f1ac36ec0b1a9b98950d9ff">CPUndoManagerGroupsByEventKey</a>   = <span class="stringliteral">@&quot;CPUndoManagerGroupsByEventKey&quot;</span>;
<a name="l00745"></a>00745 
<a name="l00746"></a>00746 <span class="keyword">@implementation </span><a class="code" href="class_c_p_undo_manager.html" title="A general mechanism for user action &amp;quot;undo&amp;quot;.">CPUndoManager</a> (CPCoding)
<a name="l00747"></a>00747 
<a name="l00748"></a><a class="code" href="class_c_p_undo_manager.html#abe59da4cdc2b929603b6ce0def53cd81">00748</a> - (id)initWithCoder:(<a class="code" href="class_c_p_coder.html" title="Defines methods for use when archiving &amp;amp; restoring (enc/decoding).">CPCoder</a>)aCoder
<a name="l00749"></a>00749 {
<a name="l00750"></a>00750     <span class="keyword">self</span> = [<span class="keyword">super</span> init];
<a name="l00751"></a>00751     
<a name="l00752"></a>00752     <span class="keywordflow">if</span> (<span class="keyword">self</span>)
<a name="l00753"></a>00753     {
<a name="l00754"></a>00754         _redoStack = [aCoder decodeObjectForKey:CPUndoManagerRedoStackKey];
<a name="l00755"></a>00755         _undoStack = [aCoder decodeObjectForKey:CPUndoManagerUndoStackKey];
<a name="l00756"></a>00756         
<a name="l00757"></a>00757         _levelsOfUndo = [aCoder decodeObjectForKey:CPUndoManagerLevelsOfUndoKey];
<a name="l00758"></a>00758         _actionName = [aCoder decodeObjectForKey:CPUndoManagerActionNameKey];
<a name="l00759"></a>00759         _currentGrouping = [aCoder decodeObjectForKey:CPUndoManagerCurrentGroupingKey];
<a name="l00760"></a>00760         
<a name="l00761"></a>00761         _state = <a class="code" href="_c_p_undo_manager_8j.html#a6d4c58cc19ea1d126dc40a9458637aa3">CPUndoManagerNormal</a>;
<a name="l00762"></a>00762         
<a name="l00763"></a>00763         [<span class="keyword">self</span> <a class="code" href="class_c_p_undo_manager.html#aac89a2ae56ce38c011a677fb9ac36e9f">setRunLoopModes</a>:[aCoder decodeObjectForKey:CPUndoManagerRunLoopModesKey]];
<a name="l00764"></a>00764         [<span class="keyword">self</span> <a class="code" href="class_c_p_undo_manager.html#af1d8252a39f2ec6f0dca17187f15e6d7">setGroupsByEvent</a>:[aCoder decodeBoolForKey:CPUndoManagerGroupsByEventKey]];
<a name="l00765"></a>00765     }
<a name="l00766"></a>00766     
<a name="l00767"></a>00767     <span class="keywordflow">return</span> <span class="keyword">self</span>;
<a name="l00768"></a>00768 }
<a name="l00769"></a>00769 
<a name="l00770"></a><a class="code" href="class_c_p_undo_manager.html#a12297dba759ae0dc66aa98780197c6db">00770</a> - (void)encodeWithCoder:(<a class="code" href="class_c_p_coder.html" title="Defines methods for use when archiving &amp;amp; restoring (enc/decoding).">CPCoder</a>)aCoder
<a name="l00771"></a>00771 {
<a name="l00772"></a>00772     [aCoder encodeObject:_redoStack forKey:CPUndoManagerRedoStackKey];
<a name="l00773"></a>00773     [aCoder encodeObject:_undoStack forKey:CPUndoManagerUndoStackKey];
<a name="l00774"></a>00774     
<a name="l00775"></a>00775     [aCoder encodeInt:_levelsOfUndo forKey:CPUndoManagerLevelsOfUndoKey];
<a name="l00776"></a>00776     [aCoder encodeObject:_actionName forKey:CPUndoManagerActionNameKey];
<a name="l00777"></a>00777     
<a name="l00778"></a>00778     [aCoder encodeObject:_currentGrouping forKey:CPUndoManagerCurrentGroupingKey];
<a name="l00779"></a>00779 
<a name="l00780"></a>00780     [aCoder encodeObject:_runLoopModes forKey:CPUndoManagerRunLoopModesKey];
<a name="l00781"></a>00781     [aCoder encodeBool:_groupsByEvent forKey:CPUndoManagerGroupsByEventKey];
<a name="l00782"></a>00782 }
<a name="l00783"></a>00783 
<a name="l00784"></a>00784 <span class="keyword">@end</span>
<a name="l00785"></a>00785 
<a name="l00786"></a>00786 <span class="keyword">@implementation </span>_CPUndoManagerProxy : <a class="code" href="class_c_p_proxy.html">CPProxy</a>
<a name="l00787"></a>00787 {
<a name="l00788"></a>00788     <a class="code" href="class_c_p_undo_manager.html" title="A general mechanism for user action &amp;quot;undo&amp;quot;.">CPUndoManager</a>   _undoManager;
<a name="l00789"></a>00789 }
<a name="l00790"></a>00790 
<a name="l00791"></a>00791 - (CPMethodSignature)methodSignatureForSelector:(<span class="keywordtype">SEL</span>)aSelector
<a name="l00792"></a>00792 {
<a name="l00793"></a>00793     <span class="keywordflow">return</span> [_undoManager _methodSignatureOfPreparedTargetForSelector:aSelector];
<a name="l00794"></a>00794 }
<a name="l00795"></a>00795 
<a name="l00796"></a>00796 - (void)forwardInvocation:(<a class="code" href="class_c_p_invocation.html" title="An object representation of a message.">CPInvocation</a>)anInvocation
<a name="l00797"></a>00797 {
<a name="l00798"></a>00798     [_undoManager _forwardInvocationToPreparedTarget:anInvocation];
<a name="l00799"></a>00799 }
<a name="l00800"></a>00800 
<a name="l00801"></a>00801 <span class="keyword">@end</span>
</pre></div></div>
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