How to let the user select an item from JOptionPane with a double-click

Question

In my Java Swing application, I show a list of options to users using a JOptionPane with a JList, using the code below:

List<Object> options = getOptions();
JList list = new JList(options.toArray());
JScrollPane scrollpane = new JScrollPane();
JPanel panel = new JPanel();
panel.add(scrollpane);
scrollpane.getViewport().add(list);
JOptionPane.showMessageDialog(null, scrollpane, 
      "Please select an object", JOptionPane.PLAIN_MESSAGE);

How can I let the user select an option by double-clicking it?

Answer 1

JList doesn't provide any special handling of double or triple (or N) mouse clicks, but it's easy to add a MouseListener if you wish to take action on these events. Use the locationToIndex method to determine what cell was clicked. For example:

 list.addMouseListener(new MouseAdapter() {
     public void mouseClicked(MouseEvent e) {
         if (e.getClickCount() == 2) {
             int index = list.locationToIndex(e.getPoint());
             System.out.println("Double clicked on Item " + index);
          }
     }
 });

I just need to know how to close the dialog after the user double-clicks the item

In this mouse event, you can make use of SwingUtilities.windowForComponent(list) to get the window and dispose it using window.dispose() function.