drag java undecorated window

Just for reminder,

“How to drag undecorated window”
place a JLabel or what ever component which does support mouse mototion and mouse event listener.

undecorated window: when window is head less. no caption bar no resizable border. is enabled by  setUndecorated( true );

private boolean mMoveStart = false;
private Point mMouseClickPoint = null;
private void _setUpMoveEvent() {
mWindowTitleLabel.addMouseMotionListener(
new MouseMotionListener() {
public void mouseDragged(MouseEvent mouseEvent) {
if (mMoveStart)
_moveWindowTo(mouseEvent.getPoint());
}

public void mouseMoved(MouseEvent mouseEvent) {

}

}
);
mWindowTitleLabel.addMouseListener(
new MouseAdapter() {
public void mousePressed(MouseEvent mouseEvent) {
mMouseClickPoint = mouseEvent.getPoint();
mMoveStart = true;
}

public void mouseReleased(MouseEvent mouseEvent) {
mMoveStart = false;
_fireStickyUpdated();
}
}
);
}

private void _moveWindowTo(Point point) {
int musDiffX = point.x - mMouseClickPoint.x;
int musDiffY = point.y - mMouseClickPoint.y;

setLocation( getLocation().x + musDiffX, getLocation().y + musDiffY );
sticky.setLocation( getLocation() );
}

here, mWindowTitleLable is JLable component

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