⭐ 欢迎来到虫虫下载站！ | 📦 资源下载 📁 资源专辑 ℹ️ 关于我们
⭐ 虫虫下载站
📤 上传资源

📄 undotext.html

📁 java类库详细讲解
💻 HTML
字号:
🔍 
<HTML>
<HEAD>
<META http-equiv="Content-Type" content="text/html; charset=UTF-8">
<TITLE>Adding Undo and Redo to a Text Component
(Java Developers Almanac Example)
</TITLE>
<META CONTENT="Patrick Chan" NAME="AUTHOR">
<META CONTENT="Code Examples from The Java Developers Almanac 1.4" NAME="DESCRIPTION">
<META CONTENT="Addison-Wesley/Patrick Chan" NAME="OWNER">
<META CONTENT="3/20/02" NAME="revision">
<STYLE TYPE="text/css">
<!--     BODY CODE  {font-family: Courier, Monospace;           font-size: 11pt}    TABLE, BODY          {font-family: Verdana, Arial, Helvetica, sans-serif;           font-size: 10pt}    PRE   {font-family: Courier, Monospace;           font-size: 10pt}    H3    {font-family: Verdana, Arial, Helvetica, sans-serif;           font-size: 11pt}    A.eglink {text-decoration: none}    A:hover.eglink {text-decoration: underline}    -->
</STYLE>
</HEAD>
<BODY>
<TABLE CELLSPACING="0" CELLPADDING="0" BORDER="0">
<TR>
<TD rowspan="3"><A HREF="/?l=ex"><IMG BORDER="0" ALIGN="BOTTOM" HSPACE="10" SRC="/egs/almanac14a.jpg"></A></TD><TD VALIGN="top"><font face="Times" size="6"><b>The Java Developers Almanac 1.4</b></font>
<br>
        Order this book from <a href="/cgi-bin/scripts/redirect.pl?l=ex&url=http://www.amazon.com/exec/obidos/ASIN/0201752808/xeo">Amazon</a>.
    </TD>
</TR>
<TR>
<TD align="right" valign="bottom">
<FORM method="get" action="/cgi-bin/search/find.pl">
<INPUT size="25" name="words" type="text"><INPUT value="Search" type="submit">
</FORM>
</TD>
</TR>
</TABLE>
<HR color="#6666cc">
<DIV ALIGN="LEFT">
<A HREF="/">Home</A>
    &gt;
    <A HREF="../index.html">List of Packages</A>
    &gt;
    <B><A HREF="../javax.swing.undo/pkg.html">javax.swing.undo</A></B><font color="#666666" SIZE="-2">
        &nbsp;[1 examples]
        </font>
</DIV><P>
  <h3>
    e1033.  
    Adding Undo and Redo to a Text Component</h3>



<pre>
    JTextArea textarea = new JTextArea();
    final UndoManager undo = new UndoManager();
    Document doc = textarea.getDocument();
    
    doc.addUndoableEditListener(new UndoableEditListener() {
        public void undoableEditHappened(UndoableEditEvent evt) {
            undo.addEdit(evt.getEdit());
        }
    });
    
    textarea.getActionMap().put(<font color="#0066ff"><i>"Undo"</i></font>,
        new AbstractAction(<font color="#0066ff"><i>"Undo"</i></font>) {
            public void actionPerformed(ActionEvent evt) {
                try {
                    if (undo.canUndo()) {
                        undo.undo();
                    }
                } catch (CannotUndoException e) {
                }
            }
        });
    textarea.getInputMap().put(KeyStroke.getKeyStroke(<font color="#0066ff"><i>"control Z"</i></font>), <font color="#0066ff"><i>"Undo"</i></font>);
    
    textarea.getActionMap().put(<font color="#0066ff"><i>"Redo"</i></font>,
        new AbstractAction(<font color="#0066ff"><i>"Redo"</i></font>) {
            public void actionPerformed(ActionEvent evt) {
                try {
                    if (undo.canRedo()) {
                        undo.redo();
                    }
                } catch (CannotRedoException e) {
                }
            }
        });
    textarea.getInputMap().put(KeyStroke.getKeyStroke(<font color="#0066ff"><i>"control Y"</i></font>), <font color="#0066ff"><i>"Redo"</i></font>);
</pre>

<br>
<FONT FACE="Verdana, Arial, Helvetica, sans-serif" SIZE="0">
&copy; 2002 Addison-Wesley.
</FONT>
</BODY>
</HTML>

⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -