get mouse X,Y coords relative to a frame

Question

I have a button and when I use mouse on the button I want to know the mouse x,y coords relative to the frame

How can I do that?

Answer 1

register a MouseListener and implement the corresponding events. MouseEvent has getX and getY methods that can give you the mouse position.

Answer 2

getBounds() gives you a Rectangle with the position and dimensions of the button relative to its parent. In my example the parent is the JFrame.

public class Click { 
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                final JFrame f = new JFrame("Click pos");
                f.setSize(640, 480);

                final JButton b = new JButton("Click Me!");
                b.addMouseListener(new MouseAdapter() {
                    public void mouseClicked(MouseEvent e) {
                        final JButton bb = (JButton) e.getSource();
                        final Rectangle bbox = bb.getBounds();
                        final int x = bbox.x + e.getX();
                        final int y = bbox.y + e.getY();
                        JOptionPane.showMessageDialog(f, "pos: " + x + " " + y);
                    }
                });
                f.getContentPane().add(b, BorderLayout.SOUTH);
                f.setVisible(true);
            }
        });
    }
}

Edit:
With the helper methods from SwingUtilities the mouseClicked method gets much simpler. And you get the correct coordinates independent of how many containers are between the JFrame and the JButton. I wasn't aware of them.

                    final JButton bb = (JButton) e.getSource();
                    Point p = SwingUtilities.convertPoint(bb, e.getPoint(), f);
                    JOptionPane.showMessageDialog(f, p);