How do I close a JDialog and have the Window Event Listeners be notified?

Question

Is there a way to close a JDialog through code such that the Window event listeners will still be notified? I've tried just setting visible to false and disposing, but neither seem to do it.

Answer 1

Closing a window (with dispose()) and hiding it (with setVisible(false)) are different operations, and produce different events -- and closing it from the operating system is yet another different operation that produces yet a different event.

All three will produce windowDeactivated to tell you the window's lost focus, but dispose() will then produce windowClosed, while closing from the OS will first produce windowClosing. If you want to handle both of these the same way, you can set the window to be disposed when closed:

window.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);

In general, setVisible(false) implies that you might want to use the window again, so it doesn't post any window events (apart from windowDeactivated). If you want to detect the hiding of a window, you need to use a ComponentListener;

window.addComponentListener(new ComponentAdapter() {
  @Override
  public void componentHidden(ComponentEvent e) {
    System.out.println("componentHidden()");
  }
})

Note though that this will pretty much only work for explicit setVisible() calls. If you need to detect hiding more generally, you can use a HierarchyListener, but it's probably more trouble than it's worth.

  window.addHierarchyListener(new HierarchyListener() {
    @Override
      public void hierarchyChanged(HierarchyEvent e) {
        System.out.println("valid: " + window.isValid());
        System.out.println("showing: " + window.isShowing());
      }
  });

Note that when you dispose a window you'll get a couple of HierarchyEvents, first for hiding and then for invalidation, but when you hide it with setVisible() it's still valid, so you won't get the invalidation.