public void mouseEntered(MouseEvent e) {
super.mouseEntered(e);
if (slider.isEnabled()) {
isRollover = thumbRect.contains(e.getPoint());
slider.repaint();
}
}
public void mouseEntered(MouseEvent e) {
super.mouseEntered(e);
isRollover = true;
Rectangle r = getTrackBounds();
scrollbar.repaint(r.x, r.y, r.width, r.height);
}