how to give drag functionaly to a JFame with no titleBar?

i m creating a JFrame with four buttons in its titleBar.

JFrame frame=new JFrame("custom JFrame with 4 buttons in title");
frame.setUndecorated(true);

JPanel button_panel=new JPanel(new FlowLayout(FlowLayout.LEFT));
JButton button_1=new JButton("+");
JButton button_2=new JButton("↑");
JButton button_3=new JButton("-");
JButton button_4=new JButton("system tray");

button_panel.add(button_1);
button_panel.add(button_2);
button_panel.add(button_3);
button_panel.add(button_4);

frame.getContentPane().add开发者_高级运维(button_panel,BorderLayout.NORTH);

now, i have a JFrame with four buttons in its titlebar.

but, how to give drag functionality to this custom JFrame?

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is it the only solution?

Well, the only solution that I know of is to use MouseListeners.

For a more general solution you can check out Moving Windows which allows you to make any Swing component dragable.

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Are you using Mac OS X? A Mac-specific solution is this:

frame.getRootPane().putClientProperty("apple.awt.draggableWindowBackground", true);

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You can drag a JFrame by it's contents by setting up the MouseListener appropriately. This post has an example.

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If you don't care about the offset between mouse position and components location on screen (components upper left corner), this is the easiest solution:

private class DragListener extends MouseAdapter {

   @Override
    public void mouseDragged(MouseEvent e) {
        setLocation(MouseInfo.getPointerInfo().getLocation());
    }
}

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You can simply override mousepressed and mousedragged methods as shown:

private int tx, ty;
private void titlebar_mousePressed(MouseEvent m)
{
    tx= m.getX();
    ty=m.getY();
}
private void titlebar_mouseDragged(MouseEvent m)
{
    titlebar.setLocation(m.getXOnScreen() -tx, m.getYOnScreen() -ty);
}