Swing/TimePicker のバックアップ(No.1)

class AutoRepeatHandler extends MouseAdapter implements ActionListener {
  private final Timer autoRepeatTimer;
  private final JTextComponent view;
  private final int delta;
  private final int min;
  private final int max;
  private JButton arrowButton;

  protected AutoRepeatHandler(JTextComponent view, int delta, int min, int max) {
    super();
    this.view = view;
    this.delta = delta;
    this.min = min;
    this.max = max;
    autoRepeatTimer = new Timer(60, this);
    autoRepeatTimer.setInitialDelay(300);
  }

  public static void adjust(JTextComponent field, int delta, int min, int max) {
    field.requestFocusInWindow();
    int range = max - min + 1;
    int value = Integer.parseInt(field.getText());
    value = (value - min + delta) % range;
    if (value < 0) {
      value += range;
    }
    value += min;
    field.setText(String.format("%02d", value));
  }

  @Override public void actionPerformed(ActionEvent e) {
    Object o = e.getSource();
    if (o instanceof Timer) {
      boolean released = Objects.nonNull(arrowButton) &&
                         !arrowButton.getModel().isPressed();
      if (released && autoRepeatTimer.isRunning()) {
        autoRepeatTimer.stop();
      }
    } else if (o instanceof JButton) {
      arrowButton = (JButton) o;
    }
    adjust(view, delta, min, max);
  }

  @Override public void mousePressed(MouseEvent e) {
    if (SwingUtilities.isLeftMouseButton(e) && e.getComponent().isEnabled()) {
      autoRepeatTimer.start();
    }
  }

  @Override public void mouseReleased(MouseEvent e) {
    autoRepeatTimer.stop();
  }

  @Override public void mouseExited(MouseEvent e) {
    if (autoRepeatTimer.isRunning()) {
      autoRepeatTimer.stop();
    }
  }
}