JTextAreaをマウスで長押しして単語選択などを実行する

class TextComponentMouseHandler extends MouseAdapter {
  private final AtomicInteger count = new AtomicInteger(0);
  private final Timer holdTimer = new Timer(1000, null);
  private final List<String> list = Arrays.asList(
      DefaultEditorKit.selectWordAction,
      DefaultEditorKit.selectLineAction,
      DefaultEditorKit.selectParagraphAction,
      DefaultEditorKit.selectAllAction);

  protected TextComponentMouseHandler(JTextComponent textArea) {
    super();
    holdTimer.setInitialDelay(500);
    holdTimer.addActionListener(e -> {
      Timer timer = (Timer) e.getSource();
      if (timer.isRunning()) {
        int i = count.getAndIncrement();
        if (i < list.size()) {
          String cmd = list.get(i);
          textArea.getActionMap().get(cmd).actionPerformed(e);
        } else {
          timer.stop();
          count.set(0);
        }
      }
    });
  }

  @Override public void mousePressed(MouseEvent e) {
    boolean isSingleClick = e.getClickCount() == 1;
    if (isSingleClick) {
      JTextComponent textArea = (JTextComponent) e.getComponent();
      if (!textArea.hasFocus()) {
        textArea.requestFocusInWindow();
      }
      if (textArea.getSelectedText() == null) {
        // Java 9: int pos = textArea.viewToModel2D(e.getPoint());
        int pos = textArea.viewToModel(e.getPoint());
        textArea.setCaretPosition(pos);
      }
      if (e.getButton() == MouseEvent.BUTTON1) {
        holdTimer.start();
      }
    }
  }

  @Override public void mouseReleased(MouseEvent e) {
    holdTimer.stop();
    count.set(0);
  }

  @Override public void mouseDragged(MouseEvent e) {
    mouseReleased(e);
  }
}