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512 lines
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<div class="subTitle">com.mxgraph.util</div>
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<h2 title="Class mxUndoManager" class="title">Class mxUndoManager</h2>
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<li><a href="../../../com/mxgraph/util/mxEventSource.html" title="class in com.mxgraph.util">com.mxgraph.util.mxEventSource</a></li>
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<li>com.mxgraph.util.mxUndoManager</li>
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<pre>public class <span class="strong">mxUndoManager</span>
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extends <a href="../../../com/mxgraph/util/mxEventSource.html" title="class in com.mxgraph.util">mxEventSource</a></pre>
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<div class="block">Implements an undo history.
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This class fires the following events:
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mxEvent.CLEAR fires after clear was executed. The event has no properties.
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mxEvent.UNDO fires afer a significant edit was undone in undo. The
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<code>edit</code> property contains the mxUndoableEdit that was undone.
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mxEvent.REDO fires afer a significant edit was redone in redo. The
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<code>edit</code> property contains the mxUndoableEdit that was redone.
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mxEvent.ADD fires after an undoable edit was added to the history. The
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<code>edit</code> property contains the mxUndoableEdit that was added.</div>
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<h3>Nested classes/interfaces inherited from class com.mxgraph.util.<a href="../../../com/mxgraph/util/mxEventSource.html" title="class in com.mxgraph.util">mxEventSource</a></h3>
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<code><a href="../../../com/mxgraph/util/mxEventSource.mxIEventListener.html" title="interface in com.mxgraph.util">mxEventSource.mxIEventListener</a></code></li>
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<caption><span>Fields</span><span class="tabEnd"> </span></caption>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Field and Description</th>
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<tr class="altColor">
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<td class="colFirst"><code>protected <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../com/mxgraph/util/mxUndoableEdit.html" title="class in com.mxgraph.util">mxUndoableEdit</a>></code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#history">history</a></strong></code>
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<div class="block">List that contains the steps of the command history.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>protected int</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#indexOfNextAdd">indexOfNextAdd</a></strong></code>
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<div class="block">Index of the element to be added next.</div>
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<tr class="altColor">
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<td class="colFirst"><code>protected int</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#size">size</a></strong></code>
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<div class="block">Maximum command history size.</div>
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<h3>Fields inherited from class com.mxgraph.util.<a href="../../../com/mxgraph/util/mxEventSource.html" title="class in com.mxgraph.util">mxEventSource</a></h3>
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<code><a href="../../../com/mxgraph/util/mxEventSource.html#eventListeners">eventListeners</a>, <a href="../../../com/mxgraph/util/mxEventSource.html#eventsEnabled">eventsEnabled</a>, <a href="../../../com/mxgraph/util/mxEventSource.html#eventSource">eventSource</a></code></li>
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<td class="colOne"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#mxUndoManager()">mxUndoManager</a></strong>()</code>
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<div class="block">Constructs a new undo manager with a default history size.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colOne"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#mxUndoManager(int)">mxUndoManager</a></strong>(int size)</code>
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<div class="block">Constructs a new undo manager for the specified size.</div>
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</td>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<th class="colLast" scope="col">Method and Description</th>
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#canRedo()">canRedo</a></strong>()</code>
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<div class="block">Returns true if a redo is possible.</div>
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</td>
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#canUndo()">canUndo</a></strong>()</code>
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<div class="block">Returns true if an undo is possible.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#clear()">clear</a></strong>()</code>
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<div class="block">Clears the command history.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>boolean</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#isEmpty()">isEmpty</a></strong>()</code> </td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#redo()">redo</a></strong>()</code>
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<div class="block">Redoes the last change.</div>
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</td>
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</tr>
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<tr class="rowColor">
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<td class="colFirst"><code>protected void</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#trim()">trim</a></strong>()</code>
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<div class="block">Removes all pending steps after indexOfNextAdd from the history,
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invoking die on each edit.</div>
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</td>
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</tr>
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<tr class="altColor">
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#undo()">undo</a></strong>()</code>
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<div class="block">Undoes the last change.</div>
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</td>
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<td class="colFirst"><code>void</code></td>
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<td class="colLast"><code><strong><a href="../../../com/mxgraph/util/mxUndoManager.html#undoableEditHappened(com.mxgraph.util.mxUndoableEdit)">undoableEditHappened</a></strong>(<a href="../../../com/mxgraph/util/mxUndoableEdit.html" title="class in com.mxgraph.util">mxUndoableEdit</a> undoableEdit)</code>
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<div class="block">Method to be called to add new undoable edits to the history.</div>
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<h3>Methods inherited from class com.mxgraph.util.<a href="../../../com/mxgraph/util/mxEventSource.html" title="class in com.mxgraph.util">mxEventSource</a></h3>
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<code><a href="../../../com/mxgraph/util/mxEventSource.html#addListener(java.lang.String, com.mxgraph.util.mxEventSource.mxIEventListener)">addListener</a>, <a href="../../../com/mxgraph/util/mxEventSource.html#fireEvent(com.mxgraph.util.mxEventObject)">fireEvent</a>, <a href="../../../com/mxgraph/util/mxEventSource.html#fireEvent(com.mxgraph.util.mxEventObject, java.lang.Object)">fireEvent</a>, <a href="../../../com/mxgraph/util/mxEventSource.html#getEventSource()">getEventSource</a>, <a href="../../../com/mxgraph/util/mxEventSource.html#isEventsEnabled()">isEventsEnabled</a>, <a href="../../../com/mxgraph/util/mxEventSource.html#removeListener(com.mxgraph.util.mxEventSource.mxIEventListener)">removeListener</a>, <a href="../../../com/mxgraph/util/mxEventSource.html#removeListener(com.mxgraph.util.mxEventSource.mxIEventListener, java.lang.String)">removeListener</a>, <a href="../../../com/mxgraph/util/mxEventSource.html#setEventsEnabled(boolean)">setEventsEnabled</a>, <a href="../../../com/mxgraph/util/mxEventSource.html#setEventSource(java.lang.Object)">setEventSource</a></code></li>
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<code><a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#clone()" title="class or interface in java.lang">clone</a>, <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#equals(java.lang.Object)" title="class or interface in java.lang">equals</a>, <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#finalize()" title="class or interface in java.lang">finalize</a>, <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#getClass()" title="class or interface in java.lang">getClass</a>, <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#hashCode()" title="class or interface in java.lang">hashCode</a>, <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notify()" title="class or interface in java.lang">notify</a>, <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#notifyAll()" title="class or interface in java.lang">notifyAll</a>, <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#toString()" title="class or interface in java.lang">toString</a>, <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait()" title="class or interface in java.lang">wait</a>, <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long)" title="class or interface in java.lang">wait</a>, <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/lang/Object.html?is-external=true#wait(long, int)" title="class or interface in java.lang">wait</a></code></li>
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<h4>size</h4>
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<pre>protected int size</pre>
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<div class="block">Maximum command history size. 0 means unlimited history. Default is 100.</div>
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<pre>protected <a href="http://download.oracle.com/javase/1.5.0/docs/api/java/util/List.html?is-external=true" title="class or interface in java.util">List</a><<a href="../../../com/mxgraph/util/mxUndoableEdit.html" title="class in com.mxgraph.util">mxUndoableEdit</a>> history</pre>
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<div class="block">List that contains the steps of the command history.</div>
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<a name="indexOfNextAdd">
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<h4>indexOfNextAdd</h4>
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<pre>protected int indexOfNextAdd</pre>
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<div class="block">Index of the element to be added next.</div>
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<a name="mxUndoManager()">
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<h4>mxUndoManager</h4>
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<pre>public mxUndoManager()</pre>
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<div class="block">Constructs a new undo manager with a default history size.</div>
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<pre>public mxUndoManager(int size)</pre>
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<div class="block">Constructs a new undo manager for the specified size.</div>
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