Question

Could you tell me what methods are called upon a JFrame/JDialog after you resize it manually?
( after you resize it using the mouse cursor, while the frame is visible on the screen). I noticed that my JDialog is not valid eventhough I call validate() or revalidate() upon it, but after I resize it a bit, my frame becomes valid.

Answer 1

I think it is java.awt.event.ComponentListener

The listener interface for receiving component events. When the
component’s size, location, or visibility changes, the relevant method
in the listener object is invoked, and the ComponentEvent is passed to
it.

For example:

public class MyFrame extends JFrame implements ComponentListener {

    @Override
    public void componentResized(ComponentEvent e) {
        // re compute?
        repaint();
    }
}