Revalidate JPanel's parent frame

Question

I want my panel to fit the frame when I show/hide fields. How could I notify to the parent frame to revalidate?

I thought about pass the frame to my panel's constructor, but I think may have a way this is already done. I remember that there was a protected attribute in JPanel, but there isn't.. maybe i remembering the wrong component.

Answer 1

you could override the addNotify in the panel into something:

public void addNotify() {
    getParent().revalidate();
    repaint();
    super.addNotify();
}

Not sure if that's what you mean though.

Answer 2

SwingUtilities.getRoot(this).invalidate();

Answer 3

I need show/hide some fields of my panel, and I want the panel to fit the frame.

You mean like a summary/details view and you want the frame size to change? Then try:

SwingUtilities.windowForComponent(...).pack();