/**
* If necessary paints the background of the component, then invokes <code>paint</code>.
*
* @param g Graphics to paint to
* @param c JComponent painting on
* @throws NullPointerException if <code>g</code> or <code>c</code> is null
* @see javax.swing.plaf.ComponentUI#update
* @see javax.swing.plaf.ComponentUI#paint
* @since 1.5
*/
public void update(Graphics g, JComponent c) {
AbstractButton button = (AbstractButton) c;
if ((c.getBackground() instanceof UIResource)
&& button.isContentAreaFilled()
&& c.isEnabled()) {
ButtonModel model = button.getModel();
if (!MetalUtils.isToolBarButton(c)) {
if (!model.isArmed()
&& !model.isPressed()
&& MetalUtils.drawGradient(
c, g, "Button.gradient", 0, 0, c.getWidth(), c.getHeight(), true)) {
paint(g, c);
return;
}
} else if (model.isRollover()
&& MetalUtils.drawGradient(
c, g, "Button.gradient", 0, 0, c.getWidth(), c.getHeight(), true)) {
paint(g, c);
return;
}
}
super.update(g, c);
}
public void uninstallDefaults(AbstractButton b) {
super.uninstallDefaults(b);
}