if(locked) return;
Dimension size = Toolkit.getDefaultToolkit().getScreenSize();
int nx = evt.getComponent().getX();
int ny = evt.getComponent().getY();
// top
if(ny < 0+sd) {
ny = 0;
}
// left
if(nx < 0+sd) {
nx = 0;
}
// right
if(nx > size.getWidth()-evt.getComponent().getWidth()-sd) {
nx = (int)size.getWidth()-evt.getComponent().getWidth();
}
// bottom
if(ny > size.getHeight()-evt.getComponent().getHeight()-sd) {
ny = (int)size.getHeight()-evt.getComponent().getHeight();
}
// make sure we don't get into a recursive loop when the
// set location generates more events
locked = true;
evt.getComponent().setLocation(nx,ny);
locked = false;
