Swing/PopupMenuBlockLayer のバックアップ(No.7)

class DisableInputLayerUI extends LayerUI<JComponent> {
  private final transient MouseAdapter dummyMouseListener = new MouseAdapter() {};
  private boolean isBlocking;
  @Override public void installUI(JComponent c) {
    super.installUI(c);
    if (c instanceof JLayer) {
      JLayer jlayer = (JLayer) c;
      jlayer.getGlassPane().addMouseListener(dummyMouseListener);
      jlayer.setLayerEventMask(
          AWTEvent.MOUSE_EVENT_MASK | AWTEvent.MOUSE_MOTION_EVENT_MASK
        | AWTEvent.MOUSE_WHEEL_EVENT_MASK | AWTEvent.KEY_EVENT_MASK);
    }
  }
  @Override public void uninstallUI(JComponent c) {
    if (c instanceof JLayer) {
      JLayer jlayer = (JLayer) c;
      jlayer.setLayerEventMask(0);
      jlayer.getGlassPane().removeMouseListener(dummyMouseListener);
    }
    super.uninstallUI(c);
  }
  @Override public void eventDispatched(AWTEvent e, JLayer l) {
    if (isBlocking && e instanceof InputEvent) {
      ((InputEvent) e).consume();
    }
  }
  private static final String CMD_REPAINT = "lock";
  public void setLocked(boolean flag) {
    firePropertyChange(CMD_REPAINT, isBlocking, flag);
    isBlocking = flag;
  }
  @Override public void applyPropertyChange(PropertyChangeEvent pce, JLayer l) {
    String cmd = pce.getPropertyName();
    if (CMD_REPAINT.equals(cmd)) {
      l.getGlassPane().setVisible((Boolean) pce.getNewValue());
    }
  }
}