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< div class = "subTitle" > < span class = "packageLabelInType" > Package< / span > < a href = "package-summary.html" > com.mxgraph.util< / a > < / div >
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< h2 title = "Class mxUndoManager" class = "title" > Class mxUndoManager< / h2 >
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< li > java.lang.Object< / li >
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< li >
< ul class = "inheritance" >
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< li > < a href = "mxEventSource.html" title = "class in com.mxgraph.util" > com.mxgraph.util.mxEventSource< / a > < / li >
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< li >
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< li > com.mxgraph.util.mxUndoManager< / li >
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< pre > public class < span class = "typeNameLabel" > mxUndoManager< / span >
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extends < a href = "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:
mxEvent.CLEAR fires after clear was executed. The event has no properties.
mxEvent.UNDO fires afer a significant edit was undone in undo. The
< code > edit< / code > property contains the mxUndoableEdit that was undone.
mxEvent.REDO fires afer a significant edit was redone in redo. The
< code > edit< / code > property contains the mxUndoableEdit that was redone.
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 >
< / li >
< / ul >
< / div >
< div class = "summary" >
< ul class = "blockList" >
< li class = "blockList" >
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< h3 > Nested classes/interfaces inherited from class com.mxgraph.util.< a href = "mxEventSource.html" title = "class in com.mxgraph.util" > mxEventSource< / a > < / h3 >
< code > < a href = "mxEventSource.mxIEventListener.html" title = "interface in com.mxgraph.util" > mxEventSource.mxIEventListener< / a > < / code > < / li >
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<!-- =========== FIELD SUMMARY =========== -->
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< h3 > Field Summary< / h3 >
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< table class = "memberSummary" >
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< caption > < span > Fields< / span > < span class = "tabEnd" > < / span > < / caption >
< tr >
< th class = "colFirst" scope = "col" > Modifier and Type< / th >
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< th class = "colSecond" scope = "col" > Field< / th >
< th class = "colLast" scope = "col" > Description< / th >
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< / tr >
< tr class = "altColor" >
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< td class = "colFirst" > < code > protected java.util.List< < a href = "mxUndoableEdit.html" title = "class in com.mxgraph.util" > mxUndoableEdit< / a > > < / code > < / td >
< th class = "colSecond" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#history" > history< / a > < / span > < / code > < / th >
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< td class = "colLast" >
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< div class = "block" > List that contains the steps of the command history.< / div >
< / td >
< / tr >
< tr class = "rowColor" >
< td class = "colFirst" > < code > protected int< / code > < / td >
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< th class = "colSecond" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#indexOfNextAdd" > indexOfNextAdd< / a > < / span > < / code > < / th >
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< td class = "colLast" >
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< div class = "block" > Index of the element to be added next.< / div >
< / td >
< / tr >
< tr class = "altColor" >
< td class = "colFirst" > < code > protected int< / code > < / td >
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< th class = "colSecond" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#size" > size< / a > < / span > < / code > < / th >
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< td class = "colLast" >
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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 = "mxEventSource.html" title = "class in com.mxgraph.util" > mxEventSource< / a > < / h3 >
< code > < a href = "mxEventSource.html#eventListeners" > eventListeners< / a > , < a href = "mxEventSource.html#eventsEnabled" > eventsEnabled< / a > , < a href = "mxEventSource.html#eventSource" > eventSource< / a > < / code > < / li >
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< / ul >
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<!-- ======== CONSTRUCTOR SUMMARY ======== -->
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< / tr >
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< th class = "colConstructorName" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#%3Cinit%3E()" > mxUndoManager< / a > < / span > ()< / code > < / th >
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< td class = "colLast" >
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< div class = "block" > Constructs a new undo manager with a default history size.< / div >
< / td >
< / tr >
< tr class = "rowColor" >
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< th class = "colConstructorName" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#%3Cinit%3E(int)" > mxUndoManager< / a > < / span > ​ (int size)< / code > < / th >
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< td class = "colLast" >
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< div class = "block" > Constructs a new undo manager for the specified size.< / div >
< / td >
< / tr >
< / table >
< / li >
< / ul >
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< / section >
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<!-- ========== METHOD SUMMARY =========== -->
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< / tr >
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< th class = "colSecond" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#canRedo()" > canRedo< / a > < / span > ()< / code > < / th >
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< td class = "colLast" >
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< div class = "block" > Returns true if a redo is possible.< / div >
< / td >
< / tr >
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< tr id = "i1" class = "rowColor" >
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< td class = "colFirst" > < code > boolean< / code > < / td >
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< th class = "colSecond" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#canUndo()" > canUndo< / a > < / span > ()< / code > < / th >
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< td class = "colLast" >
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< div class = "block" > Returns true if an undo is possible.< / div >
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< tr id = "i2" class = "altColor" >
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< td class = "colFirst" > < code > void< / code > < / td >
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< th class = "colSecond" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#clear()" > clear< / a > < / span > ()< / code > < / th >
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< td class = "colLast" >
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< div class = "block" > Clears the command history.< / div >
< / td >
< / tr >
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< tr id = "i3" class = "rowColor" >
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< td class = "colFirst" > < code > boolean< / code > < / td >
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< th class = "colSecond" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#isEmpty()" > isEmpty< / a > < / span > ()< / code > < / th >
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< td class = "colLast" > < / td >
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< / tr >
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< tr id = "i4" class = "altColor" >
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< td class = "colFirst" > < code > void< / code > < / td >
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< th class = "colSecond" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#redo()" > redo< / a > < / span > ()< / code > < / th >
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< td class = "colLast" >
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< div class = "block" > Redoes the last change.< / div >
< / td >
< / tr >
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< tr id = "i5" class = "rowColor" >
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< td class = "colFirst" > < code > protected void< / code > < / td >
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< th class = "colSecond" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#trim()" > trim< / a > < / span > ()< / code > < / th >
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< td class = "colLast" >
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< div class = "block" > Removes all pending steps after indexOfNextAdd from the history,
invoking die on each edit.< / div >
< / td >
< / tr >
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< tr id = "i6" class = "altColor" >
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< td class = "colFirst" > < code > void< / code > < / td >
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< th class = "colSecond" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#undo()" > undo< / a > < / span > ()< / code > < / th >
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< td class = "colLast" >
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< div class = "block" > Undoes the last change.< / div >
< / td >
< / tr >
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< tr id = "i7" class = "rowColor" >
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< td class = "colFirst" > < code > void< / code > < / td >
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< th class = "colSecond" scope = "row" > < code > < span class = "memberNameLink" > < a href = "#undoableEditHappened(com.mxgraph.util.mxUndoableEdit)" > undoableEditHappened< / a > < / span > ​ (< a href = "mxUndoableEdit.html" title = "class in com.mxgraph.util" > mxUndoableEdit< / a > undoableEdit)< / code > < / th >
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< td class = "colLast" >
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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 = "mxEventSource.html" title = "class in com.mxgraph.util" > mxEventSource< / a > < / h3 >
< code > < a href = "mxEventSource.html#addListener(java.lang.String,com.mxgraph.util.mxEventSource.mxIEventListener)" > addListener< / a > , < a href = "mxEventSource.html#fireEvent(com.mxgraph.util.mxEventObject)" > fireEvent< / a > , < a href = "mxEventSource.html#fireEvent(com.mxgraph.util.mxEventObject,java.lang.Object)" > fireEvent< / a > , < a href = "mxEventSource.html#getEventSource()" > getEventSource< / a > , < a href = "mxEventSource.html#isEventsEnabled()" > isEventsEnabled< / a > , < a href = "mxEventSource.html#removeListener(com.mxgraph.util.mxEventSource.mxIEventListener)" > removeListener< / a > , < a href = "mxEventSource.html#removeListener(com.mxgraph.util.mxEventSource.mxIEventListener,java.lang.String)" > removeListener< / a > , < a href = "mxEventSource.html#setEventsEnabled(boolean)" > setEventsEnabled< / a > , < a href = "mxEventSource.html#setEventSource(java.lang.Object)" > setEventSource< / a > < / code > < / li >
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< h3 > Methods inherited from class java.lang.Object< / h3 >
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< pre > protected int size< / pre >
< div class = "block" > Maximum command history size. 0 means unlimited history. Default is 100.< / div >
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< h4 > history< / h4 >
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< pre > protected java.util.List< < a href = "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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< pre > protected int indexOfNextAdd< / pre >
< div class = "block" > Index of the element to be added next.< / div >
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< div class = "block" > Constructs a new undo manager with a default history size.< / div >
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< div class = "block" > Constructs a new undo manager for the specified size.< / div >
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< pre class = "methodSignature" > public void clear()< / pre >
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< div class = "block" > Clears the command history.< / div >
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< pre class = "methodSignature" > public boolean canUndo()< / pre >
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< div class = "block" > Returns true if an undo is possible.< / div >
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< h4 > undo< / h4 >
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< pre class = "methodSignature" > public void undo()< / pre >
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< div class = "block" > Undoes the last change.< / div >
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< pre class = "methodSignature" > public void redo()< / pre >
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< div class = "block" > Redoes the last change.< / div >
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< a id = "undoableEditHappened(com.mxgraph.util.mxUndoableEdit)" >
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< pre class = "methodSignature" > public void undoableEditHappened​ (< a href = "mxUndoableEdit.html" title = "class in com.mxgraph.util" > mxUndoableEdit< / a > undoableEdit)< / pre >
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< div class = "block" > Method to be called to add new undoable edits to the history.< / div >
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< pre class = "methodSignature" > protected void trim()< / pre >
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< div class = "block" > Removes all pending steps after indexOfNextAdd from the history,
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