undoableedit.html

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<A NAME="undo()"><!-- --></A><H3>
undo</H3>
<PRE>
public void <B>undo</B>()
          throws <A HREF="../../../javax/swing/undo/CannotUndoException.html">CannotUndoException</A></PRE>
<DL>
<DD>Undo the edit that was made.</DL>
<HR>

<A NAME="canUndo()"><!-- --></A><H3>
canUndo</H3>
<PRE>
public boolean <B>canUndo</B>()</PRE>
<DL>
<DD>True if it is still possible to undo this operation</DL>
<HR>

<A NAME="redo()"><!-- --></A><H3>
redo</H3>
<PRE>
public void <B>redo</B>()
          throws <A HREF="../../../javax/swing/undo/CannotRedoException.html">CannotRedoException</A></PRE>
<DL>
<DD>Re-apply the edit, assuming that it has been undone.</DL>
<HR>

<A NAME="canRedo()"><!-- --></A><H3>
canRedo</H3>
<PRE>
public boolean <B>canRedo</B>()</PRE>
<DL>
<DD>True if it is still possible to redo this operation</DL>
<HR>

<A NAME="die()"><!-- --></A><H3>
die</H3>
<PRE>
public void <B>die</B>()</PRE>
<DL>
<DD>May be sent to inform an edit that it should no longer be
 used. This is a useful hook for cleaning up state no longer
 needed once undoing or redoing is impossible--for example,
 deleting file resources used by objects that can no longer be
 undeleted. UndoManager calls this before it dequeues edits.

 Note that this is a one-way operation. There is no "undie"
 method.<DD><DL>
<DT><B>See Also: </B><DD><A HREF="../../../javax/swing/undo/CompoundEdit.html#die()"><CODE>CompoundEdit.die()</CODE></A></DL>
</DD>
</DL>
<HR>

<A NAME="addEdit(javax.swing.undo.UndoableEdit)"><!-- --></A><H3>
addEdit</H3>
<PRE>
public boolean <B>addEdit</B>(<A HREF="../../../javax/swing/undo/UndoableEdit.html">UndoableEdit</A>&nbsp;anEdit)</PRE>
<DL>
<DD>This UndoableEdit should absorb anEdit if it can. Return true
 if anEdit has been incoporated, false if it has not.

 <p>Typically the receiver is already in the queue of a
 UndoManager (or other UndoableEditListener), and is being
 given a chance to incorporate anEdit rather than letting it be
 added to the queue in turn.</p>

 <p>If true is returned, from now on anEdit must return false from
 canUndo() and canRedo(), and must throw the appropriate
 exception on undo() or redo().</p></DL>
<HR>

<A NAME="replaceEdit(javax.swing.undo.UndoableEdit)"><!-- --></A><H3>
replaceEdit</H3>
<PRE>
public boolean <B>replaceEdit</B>(<A HREF="../../../javax/swing/undo/UndoableEdit.html">UndoableEdit</A>&nbsp;anEdit)</PRE>
<DL>
<DD>Return true if this UndoableEdit should replace anEdit. The
 receiver should incorporate anEdit's state before returning true.

 <p>This message is the opposite of addEdit--anEdit has typically
 already been queued in a UndoManager (or other
 UndoableEditListener), and the receiver is being given a chance
 to take its place.</p>

 <p>If true is returned, from now on anEdit must return false from
 canUndo() and canRedo(), and must throw the appropriate
 exception on undo() or redo().</p></DL>
<HR>

<A NAME="isSignificant()"><!-- --></A><H3>
isSignificant</H3>
<PRE>
public boolean <B>isSignificant</B>()</PRE>
<DL>
<DD>Return false if this edit is insignificant--for example one
 that maintains the user's selection, but does not change any
 model state. This status can be used by an UndoableEditListener
 (like UndoManager) when deciding which UndoableEdits to present
 to the user as Undo/Redo options, and which to perform as side
 effects of undoing or redoing other events.</DL>
<HR>

<A NAME="getPresentationName()"><!-- --></A><H3>
getPresentationName</H3>
<PRE>
public <A HREF="../../../java/lang/String.html">String</A> <B>getPresentationName</B>()</PRE>
<DL>
<DD>Provide a localized, human readable description of this edit
 suitable for use in, say, a change log.</DL>
<HR>

<A NAME="getUndoPresentationName()"><!-- --></A><H3>
getUndoPresentationName</H3>
<PRE>
public <A HREF="../../../java/lang/String.html">String</A> <B>getUndoPresentationName</B>()</PRE>
<DL>
<DD>Provide a localized, human readable description of the undoable
 form of this edit, e.g. for use as an Undo menu item. Typically
 derived from getDescription();</DL>
<HR>

<A NAME="getRedoPresentationName()"><!-- --></A><H3>
getRedoPresentationName</H3>
<PRE>
public <A HREF="../../../java/lang/String.html">String</A> <B>getRedoPresentationName</B>()</PRE>
<DL>
<DD>Provide a localized, human readable description of the redoable
 form of this edit, e.g. for use as a Redo menu item. Typically
 derived from getPresentationName();</DL>
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