Question

I need to set component’s location in a window.
I need to draw component on a GlassPane near another component, which was clicked. I pass the component, which raises click event to some manager, there I want to get coordinates where to paint.

public void mouseClicked(MouseEvent e) {
                ApplicationManager.getInstance().drawOnGlassPane((Component e.getSource());
            }

public void drawOnGlassPane(final Component caller) {

        mainFrame = (JFrame) SwingUtilities.getWindowAncestor(caller);
        JPanel glassPane = (JPanel) mainFrame.getGlassPane();
        glassPane.setVisible(true);

        Point where = caller.getLocationOnScreen();
        JButton btn = new JButton("on glass pane");
        btn.setBounds((int) where.getX(), (int) (where.getY() + caller.getHeight()), 50, 20);
        glassPane.add(btn);
    }
}

The new component appears in a wrong place. How could I set correct location?

Answer 1

this question is described including example in the tutorial about How to Use Root Panes, another example here and here