Swing/CellEditorPopupMenu のバックアップ(No.10)

  • title: JTableのセルエディタにJPopupMenuを設定 tags: [JTable, TableCellEditor, UndoManager, JPopupMenu, AncestorListener] author: aterai pubdate: 2010-04-26T16:54:26+09:00 description: JTableのセルエディタに、Copy、Paste、Undo、Redoなどを行うJPopupMenuを設定します。

概要

JTableのセルエディタに、Copy、Paste、Undo、Redoなどを行うJPopupMenuを設定します。

Screenshot

screenshot

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サンプルコード

public static JPopupMenu installTextComponentPopupMenu(final JTextComponent tc) {
  final UndoManager manager = new UndoManager();
  final Action undoAction   = new UndoAction(manager);
  final Action redoAction   = new RedoAction(manager);
  final Action cutAction    = new DefaultEditorKit.CutAction();
  final Action copyAction   = new DefaultEditorKit.CopyAction();
  final Action pasteAction  = new DefaultEditorKit.PasteAction();
  final Action deleteAction = new AbstractAction("delete") {
    @Override public void actionPerformed(ActionEvent e) {
      JPopupMenu pop = (JPopupMenu)e.getSource();
      ((JTextComponent)pop.getInvoker()).replaceSelection(null);
    }
  };
  tc.addAncestorListener(new AncestorListener() {
    @Override public void ancestorAdded(AncestorEvent e) {
      manager.discardAllEdits();
      tc.requestFocusInWindow();
    }
    @Override public void ancestorMoved(AncestorEvent e) {}
    @Override public void ancestorRemoved(AncestorEvent e) {}
  });
  tc.getDocument().addUndoableEditListener(manager);
  tc.getActionMap().put("undo", undoAction);
  tc.getActionMap().put("redo", redoAction);
  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");

  JPopupMenu popup = new JPopupMenu();
  popup.add(cutAction);
  popup.add(copyAction);
  popup.add(pasteAction);
  popup.add(deleteAction);
  popup.addSeparator();
  popup.add(undoAction);
  popup.add(redoAction);

  popup.addPopupMenuListener(new PopupMenuListener() {
    @Override public void popupMenuCanceled(PopupMenuEvent e) {}
    @Override public void popupMenuWillBecomeInvisible(PopupMenuEvent e) {
      undoAction.setEnabled(true);
      redoAction.setEnabled(true);
    }
    @Override public void popupMenuWillBecomeVisible(PopupMenuEvent e) {
      JPopupMenu pop = (JPopupMenu)e.getSource();
      JTextField field = (JTextField)pop.getInvoker();
      boolean flg = field.getSelectedText()!=null;
      cutAction.setEnabled(flg);
      copyAction.setEnabled(flg);
      deleteAction.setEnabled(flg);
      undoAction.setEnabled(manager.canUndo());
      redoAction.setEnabled(manager.canRedo());
    }
  });
  tc.setComponentPopupMenu(popup);
  return popup;
}
View in GitHub: Java, Kotlin

解説

上記のサンプルでは、JTableのセルエディタに、Cut、Copy、Paste、Delete、Undo、Redoを行うJPopupMenuを設定しています。

セルエディタとして使用しているJTextFieldは、おなじものを使い回しているので、別のセルでの編集が持ち越されないよう、AncestorListenerを使って表示されるたびに、UndoManagerを空(UndoManager#discardAllEdits()を呼び出す)にしています。

もしくは、DefaultCellEditor#isCellEditable(...)などをオーバーライドしてリセットする方法もあります。

DefaultCellEditor ce = new DefaultCellEditor(new JTextField()) {
  @Override public boolean isCellEditable(EventObject e) {
    boolean b = super.isCellEditable(e);
    if(b) {
      manager.discardAllEdits();
    }
    return b;
  }
};
table.setDefaultEditor(Object.class, ce);

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