Swing/UndoManager のバックアップの現在との差分(No.1)

UndoManagerでJTextFieldのUndo、Redoを行う

#screenshot

サンプルコード

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* サンプルコード [#sourcecode]
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#code(link){{
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private static void initUndoRedo(JTextComponent tc) {
  UndoManager manager = new UndoManager();
  tc.getDocument().addUndoableEditListener(manager);
  tc.getActionMap().put("undo", new UndoAction(manager));
  tc.getActionMap().put("redo", new RedoAction(manager));
  InputMap imap = tc.getInputMap(JComponent.WHEN_ANCESTOR_OF_FOCUSED_COMPONENT);
  imap.put(KeyStroke.getKeyStroke(KeyEvent.VK_Z, Event.CTRL_MASK), "undo");
  imap.put(KeyStroke.getKeyStroke(KeyEvent.VK_Y, Event.CTRL_MASK), "redo");
  imap.put(KeyStroke.getKeyStroke(
    KeyEvent.VK_Z, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()), "undo");
  imap.put(KeyStroke.getKeyStroke(
    KeyEvent.VK_Y, Toolkit.getDefaultToolkit().getMenuShortcutKeyMask()), "redo");
}
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private static class UndoAction extends AbstractAction {
  private final UndoManager undoManager;
  public UndoAction(UndoManager manager) {
    super("undo");
    this.undoManager = manager;
  }
  public void actionPerformed(ActionEvent e) {
    try{
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  @Override public void actionPerformed(ActionEvent e) {
    try {
      undoManager.undo();
    }catch(CannotUndoException cue) {
      //cue.printStackTrace();
    } catch (CannotUndoException ex) {
      // ex.printStackTrace();
      Toolkit.getDefaultToolkit().beep();
    }
  }
}

• Undo
  • Ctrl-Z
• Redo
  • Ctrl-Y

解説

参考リンク

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