@Override
protected MouseWheelListener createMouseWheelListener() {
	return new BasicScrollPaneUI.MouseWheelHandler() {
		@Override
		public void mouseWheelMoved( MouseWheelEvent e ) {
			// Note: Getting UI value "ScrollPane.smoothScrolling" here to allow
			// applications to turn smooth scrolling on or off at any time
			// (e.g. in application options dialog).
			if( UIManager.getBoolean( "ScrollPane.smoothScrolling" ) &&
				scrollpane.isWheelScrollingEnabled() &&
				e.getScrollType() == MouseWheelEvent.WHEEL_UNIT_SCROLL &&
				e.getPreciseWheelRotation() != 0 &&
				e.getPreciseWheelRotation() != e.getWheelRotation() )
			{
				mouseWheelMovedSmooth( e );
			} else
				super.mouseWheelMoved( e );
		}
	};
}
 

@Override
protected PropertyChangeListener createPropertyChangeListener() {
	return new BasicScrollPaneUI.PropertyChangeHandler() {
		@Override
		public void propertyChange( PropertyChangeEvent e ) {
			super.propertyChange( e );

			switch( e.getPropertyName() ) {
				case FlatClientProperties.SCROLL_BAR_SHOW_BUTTONS:
					JScrollBar vsb = scrollpane.getVerticalScrollBar();
					JScrollBar hsb = scrollpane.getHorizontalScrollBar();
					if( vsb != null ) {
						vsb.revalidate();
						vsb.repaint();
					}
					if( hsb != null ) {
						hsb.revalidate();
						hsb.repaint();
					}
					break;

				case ScrollPaneConstants.LOWER_LEFT_CORNER:
				case ScrollPaneConstants.LOWER_RIGHT_CORNER:
				case ScrollPaneConstants.UPPER_LEFT_CORNER:
				case ScrollPaneConstants.UPPER_RIGHT_CORNER:
					// remove border from buttons added to corners
					Object corner = e.getNewValue();
					if( corner instanceof JButton &&
						((JButton)corner).getBorder() instanceof FlatButtonBorder &&
						scrollpane.getViewport() != null &&
						scrollpane.getViewport().getView() instanceof JTable )
					{
						((JButton)corner).setBorder( BorderFactory.createEmptyBorder() );
						((JButton)corner).setFocusable( false );
					}
				break;
			}
		}
	};
}