Code
class PressAndHoldHandler extends AbstractAction implements MouseListener {
public final JPopupMenu pop = new JPopupMenu();
public final ButtonGroup bg = new ButtonGroup();
private AbstractButton arrowButton;
private final Timer holdTimer = new Timer(1000, new ActionListener() {
@Override public void actionPerformed(ActionEvent e) {
System.out.println("InitialDelay(1000)");
if (arrowButton != null && arrowButton.getModel().isPressed()
&& holdTimer.isRunning()) {
holdTimer.stop();
pop.show(arrowButton, 0, arrowButton.getHeight());
pop.requestFocusInWindow();
}
}
});
public PressAndHoldHandler() {
super();
holdTimer.setInitialDelay(1000);
pop.setLayout(new GridLayout(0, 3, 5, 5));
for (MenuContext m: makeMenuList()) {
AbstractButton b = new JRadioButton(m.command);
b.setActionCommand(m.command);
b.setForeground(m.color);
b.setBorder(BorderFactory.createEmptyBorder());
b.addActionListener(new ActionListener() {
@Override public void actionPerformed(ActionEvent e) {
System.out.println(bg.getSelection().getActionCommand());
pop.setVisible(false);
}
});
pop.add(b);
bg.add(b);
}
}
private List makeMenuList() {
return Arrays.asList(
new MenuContext("BLACK", Color.BLACK),
new MenuContext("BLUE", Color.BLUE),
new MenuContext("CYAN", Color.CYAN),
new MenuContext("GREEN", Color.GREEN),
new MenuContext("MAGENTA", Color.MAGENTA),
new MenuContext("ORANGE", Color.ORANGE),
new MenuContext("PINK", Color.PINK),
new MenuContext("RED", Color.RED),
new MenuContext("YELLOW", Color.YELLOW));
}
@Override public void actionPerformed(ActionEvent e) {
System.out.println("actionPerformed");
if (holdTimer.isRunning()) {
ButtonModel model = bg.getSelection();
if (model != null) {
System.out.println(model.getActionCommand());
}
holdTimer.stop();
}
}
@Override public void mousePressed(MouseEvent e) {
System.out.println("mousePressed");
Component c = e.getComponent();
if (SwingUtilities.isLeftMouseButton(e) && c.isEnabled()) {
arrowButton = (AbstractButton) c;
holdTimer.start();
}
}
@Override public void mouseReleased(MouseEvent e) {
holdTimer.stop();
}
@Override public void mouseExited(MouseEvent e) {
if (holdTimer.isRunning()) {
holdTimer.stop();
}
}
@Override public void mouseEntered(MouseEvent e) { /* not needed */ }
@Override public void mouseClicked(MouseEvent e) { /* not needed */ }
}
References
