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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Frameset//EN""http://www.w3.org/TR/REC-html40/frameset.dtd"><!--NewPage--><HTML><HEAD><!-- Generated by javadoc on Thu Apr 27 23:42:54 PDT 2000 --><TITLE>Java 2 Platform SE v1.3: Class UndoManager</TITLE><LINK REL ="stylesheet" TYPE="text/css" HREF="../../../stylesheet.css" TITLE="Style"></HEAD><BODY BGCOLOR="white"><!-- ========== START OF NAVBAR ========== --><A NAME="navbar_top"><!-- --></A><TABLE BORDER="0" WIDTH="100%" CELLPADDING="1" CELLSPACING="0"><TR><TD COLSPAN=2 BGCOLOR="#EEEEFF" CLASS="NavBarCell1"><A NAME="navbar_top_firstrow"><!-- --></A><TABLE BORDER="0" CELLPADDING="0" CELLSPACING="3"> <TR ALIGN="center" VALIGN="top"> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../overview-summary.html"><FONT CLASS="NavBarFont1"><B>Overview</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-summary.html"><FONT CLASS="NavBarFont1"><B>Package</B></FONT></A> </TD> <TD BGCOLOR="#FFFFFF" CLASS="NavBarCell1Rev"> <FONT CLASS="NavBarFont1Rev"><B>Class</B></FONT> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="class-use/UndoManager.html"><FONT CLASS="NavBarFont1"><B>Use</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="package-tree.html"><FONT CLASS="NavBarFont1"><B>Tree</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../deprecated-list.html"><FONT CLASS="NavBarFont1"><B>Deprecated</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../index-files/index-1.html"><FONT CLASS="NavBarFont1"><B>Index</B></FONT></A> </TD> <TD BGCOLOR="#EEEEFF" CLASS="NavBarCell1"> <A HREF="../../../help-doc.html"><FONT CLASS="NavBarFont1"><B>Help</B></FONT></A> </TD> </TR></TABLE></TD><TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM><b>Java<sup><font size=-2>TM</font></sup> 2 Platform<br>Std. Ed. v1.3</b></EM></TD></TR><TR><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../javax/swing/undo/UndoableEditSupport.html"><B>PREV CLASS</B></A> NEXT CLASS</FONT></TD><TD BGCOLOR="white" CLASS="NavBarCell2"><FONT SIZE="-2"> <A HREF="../../../index.html" TARGET="_top"><B>FRAMES</B></A> <A HREF="UndoManager.html" TARGET="_top"><B>NO FRAMES</B></A></FONT></TD></TR><TR><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2"> SUMMARY: INNER | <A HREF="#fields_inherited_from_class_javax.swing.undo.CompoundEdit">FIELD</A> | <A HREF="#constructor_summary">CONSTR</A> | <A HREF="#method_summary">METHOD</A></FONT></TD><TD VALIGN="top" CLASS="NavBarCell3"><FONT SIZE="-2">DETAIL: FIELD | <A HREF="#constructor_detail">CONSTR</A> | <A HREF="#method_detail">METHOD</A></FONT></TD></TR></TABLE><!-- =========== END OF NAVBAR =========== --><HR><!-- ======== START OF CLASS DATA ======== --><H2><FONT SIZE="-1">javax.swing.undo</FONT><BR>Class UndoManager</H2><PRE><A HREF="../../../java/lang/Object.html">java.lang.Object</A> | +--<A HREF="../../../javax/swing/undo/AbstractUndoableEdit.html">javax.swing.undo.AbstractUndoableEdit</A> | +--<A HREF="../../../javax/swing/undo/CompoundEdit.html">javax.swing.undo.CompoundEdit</A> | +--<B>javax.swing.undo.UndoManager</B></PRE><DL><DT><B>All Implemented Interfaces:</B> <DD><A HREF="../../../java/util/EventListener.html">EventListener</A>, <A HREF="../../../java/io/Serializable.html">Serializable</A>, <A HREF="../../../javax/swing/undo/UndoableEdit.html">UndoableEdit</A>, <A HREF="../../../javax/swing/event/UndoableEditListener.html">UndoableEditListener</A></DD></DL><HR><DL><DT>public class <B>UndoManager</B><DT>extends <A HREF="../../../javax/swing/undo/CompoundEdit.html">CompoundEdit</A><DT>implements <A HREF="../../../javax/swing/event/UndoableEditListener.html">UndoableEditListener</A></DL><P>Concrete subclass of CompoundEdit which can serve as an UndoableEditListener, consolidating the UndoableEditEvents from a variety of sources, and undoing or redoing them one at a time. Unlike AbstractUndoableEdit and CompoundEdit, the public methods of this class are synchronized, and should be safe to call from multiple threads. This should make UndoManager a convenient marshall for sets of undoable JavaBeans. <p> <strong>Warning:</strong> Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. A future release of Swing will provide support for long term persistence.<P><DL><DT><B>See Also: </B><DD><A HREF="../../../serialized-form.html#javax.swing.undo.UndoManager">Serialized Form</A></DL><HR><P><!-- ======== INNER CLASS SUMMARY ======== --><!-- =========== FIELD SUMMARY =========== --><A NAME="fields_inherited_from_class_javax.swing.undo.CompoundEdit"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class javax.swing.undo.<A HREF="../../../javax/swing/undo/CompoundEdit.html">CompoundEdit</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../javax/swing/undo/CompoundEdit.html#edits">edits</A></CODE></TD></TR></TABLE> <A NAME="fields_inherited_from_class_javax.swing.undo.AbstractUndoableEdit"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#EEEEFF" CLASS="TableSubHeadingColor"><TD><B>Fields inherited from class javax.swing.undo.<A HREF="../../../javax/swing/undo/AbstractUndoableEdit.html">AbstractUndoableEdit</A></B></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><A HREF="../../../javax/swing/undo/AbstractUndoableEdit.html#RedoName">RedoName</A>, <A HREF="../../../javax/swing/undo/AbstractUndoableEdit.html#UndoName">UndoName</A></CODE></TD></TR></TABLE> <!-- ======== CONSTRUCTOR SUMMARY ======== --><A NAME="constructor_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Constructor Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#UndoManager()">UndoManager</A></B>()</CODE><BR> </TD></TR></TABLE> <!-- ========== METHOD SUMMARY =========== --><A NAME="method_summary"><!-- --></A><TABLE BORDER="1" CELLPADDING="3" CELLSPACING="0" WIDTH="100%"><TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor"><TD COLSPAN=2><FONT SIZE="+2"><B>Method Summary</B></FONT></TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#addEdit(javax.swing.undo.UndoableEdit)">addEdit</A></B>(<A HREF="../../../javax/swing/undo/UndoableEdit.html">UndoableEdit</A> anEdit)</CODE><BR> If inProgress, inserts anEdit at indexOfNextAdd, and removes any old edits that were at indexOfNextAdd or later.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#canRedo()">canRedo</A></B>()</CODE><BR> Overridden to preserve usual semantics: returns true if a redo operation would be successful now, false otherwise</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#canUndo()">canUndo</A></B>()</CODE><BR> Overridden to preserve usual semantics: returns true if an undo operation would be successful now, false otherwise</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> boolean</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#canUndoOrRedo()">canUndoOrRedo</A></B>()</CODE><BR> Return true if calling undoOrRedo will undo or redo.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#discardAllEdits()">discardAllEdits</A></B>()</CODE><BR> Empty the undo manager, sending each edit a die message in the process.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected <A HREF="../../../javax/swing/undo/UndoableEdit.html">UndoableEdit</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#editToBeRedone()">editToBeRedone</A></B>()</CODE><BR> Returns the the next significant edit to be redone if redo is called.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected <A HREF="../../../javax/swing/undo/UndoableEdit.html">UndoableEdit</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#editToBeUndone()">editToBeUndone</A></B>()</CODE><BR> Returns the the next significant edit to be undone if undo is called.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#end()">end</A></B>()</CODE><BR> Sending end() to an UndoManager turns it into a plain old (ended) CompoundEdit.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> int</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#getLimit()">getLimit</A></B>()</CODE><BR> Returns the maximum number of edits this UndoManager will hold.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#getRedoPresentationName()">getRedoPresentationName</A></B>()</CODE><BR> If inProgress, returns getRedoPresentationName of the significant edit that will be redone when redo() is invoked.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#getUndoOrRedoPresentationName()">getUndoOrRedoPresentationName</A></B>()</CODE><BR> Return the appropriate name for a command that toggles between undo and redo.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> <A HREF="../../../java/lang/String.html">String</A></CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#getUndoPresentationName()">getUndoPresentationName</A></B>()</CODE><BR> If inProgress, returns getUndoPresentationName of the significant edit that will be undone when undo() is invoked.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE> void</CODE></FONT></TD><TD><CODE><B><A HREF="../../../javax/swing/undo/UndoManager.html#redo()">redo</A></B>()</CODE><BR> If this UndoManager is inProgress, redoes the last significant UndoableEdit at indexOfNextAdd or after, and all insignificant edits up to it.</TD></TR><TR BGCOLOR="white" CLASS="TableRowColor"><TD ALIGN="right" VALIGN="top" WIDTH="1%"><FONT SIZE="-1"><CODE>protected void</CODE></FONT></TD>⌨️ 快捷键说明
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