How to hide the arrow buttons in a JScrollBar

Question

I need to hide the arrow buttons of java.awt.Scrollbar(VERTICAL) in an AWT application. Does anyone know how this can be achieved?

I saw an example here, but the code just hides the buttons. The vacant space for the buttons still remains; it is not occupied by the scroll bar.

To be more exact, here is the screenshot of what I should achieve. I am not sure which direction to go about it.

Update : I was looking for a solution in AWT. But now I am open to suggestions in Swing as well.

Answer 1

Try this.. it replaces the regular buttons on the Vertical ScrollBar with buttons that are 0x0 in size.

It does limit your look and feel though :(

JScrollPane scroller = new JScrollPane(mainPane);
scroller.setPreferredSize(new Dimension(200,200));
// ... etc
scroller.getVerticalScrollBar().setUI(new BasicScrollBarUI()
    {   
        @Override
        protected JButton createDecreaseButton(int orientation) {
            return createZeroButton();
        }

        @Override    
        protected JButton createIncreaseButton(int orientation) {
            return createZeroButton();
        }

        private JButton createZeroButton() {
            JButton jbutton = new JButton();
            jbutton.setPreferredSize(new Dimension(0, 0));
            jbutton.setMinimumSize(new Dimension(0, 0));
            jbutton.setMaximumSize(new Dimension(0, 0));
            return jbutton;
        }
    });

Update: sorry, this is a swing solution

Answer 2

Using Nimbus Look and Feel you can use this to remove the arrow buttons:

    UIManager.getLookAndFeelDefaults().put(
        "ScrollBar:\"ScrollBar.button\".size", 0);
    UIManager.getLookAndFeelDefaults().put(
        "ScrollBar.decrementButtonGap", 0);
    UIManager.getLookAndFeelDefaults().put(
        "ScrollBar.incrementButtonGap", 0);

Here is a full example:

public class ScrollDemo extends JFrame {

    public ScrollDemo() {

        String[] columnNames = {"Column"};
        Object[][] data = {
                {"A"},{"B"},{"C"},{"D"},{"E"},{"F"},
                {"A"},{"B"},{"C"},{"D"},{"E"},{"F"},
                {"A"},{"B"},{"C"},{"D"},{"E"},{"F"},
                {"A"},{"B"},{"C"},{"D"},{"E"},{"F"},
                {"A"},{"B"},{"C"},{"D"},{"E"},{"F"},
        };

        add(new JScrollPane(new JTable(data, columnNames)));
        pack();
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {

            @Override
            public void run() {

                try {
                    UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
                } catch (Exception e) {
                    // No Nimbus
                }
                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar:ScrollBarThumb[Enabled].backgroundPainter",
                        new FillPainter(new Color(127, 169, 191)));
                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar:ScrollBarThumb[MouseOver].backgroundPainter",
                        new FillPainter(new Color(127, 169, 191)));
                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar:ScrollBarTrack[Enabled].backgroundPainter",
                        new FillPainter(new Color(190, 212, 223)));

                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar:\"ScrollBar.button\".size", 0);
                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar.decrementButtonGap", 0);
                UIManager.getLookAndFeelDefaults().put(
                        "ScrollBar.incrementButtonGap", 0);

                new ScrollDemo();
            }
        });
    }

}

Code for the Painter used:

public class FillPainter implements Painter<JComponent> {

    private final Color color;

    public FillPainter(Color c) { color = c; }

    @Override
    public void paint(Graphics2D g, JComponent object, int width, int height) {
        g.setColor(color);
        g.fillRect(0, 0, width-1, height-1);
    }

}