Question

This is a continuation of the question “Java rounded Swing JButton”. I have searched for an extension of javax.swing.JButton which will inherit all runtime behavior and just override drawing of the corners.

Using the code given by noah.w on sun forums page the result looks like this:

I’d like to be able to have the same gradient in the background, on mouse over change etc. Does anybody know how to do that?

Code which creates the Java Swing window from the picture is:

public class XrButton extends JButton implements MouseListener {

    private static final long serialVersionUID = 9032198251140247116L;

    String text;
    boolean mouseIn = false;

    public XrButton(String s) {
        super(s);
        text = s;
        setBorderPainted(false);
        addMouseListener(this);
        setContentAreaFilled(false);
    }

    @Override
    public void paintComponent(Graphics g) {
        Graphics2D g2 = (Graphics2D) g;
        if (getModel().isPressed()) {
            g.setColor(g.getColor());
            g2.fillRect(3, 3, getWidth() - 6, getHeight() - 6);
        }
        super.paintComponent(g);

        if (mouseIn)
            g2.setColor(Color.red);
        else
            g2.setColor(new Color(128, 0, 128));

        g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                RenderingHints.VALUE_ANTIALIAS_ON);
        g2.setStroke(new BasicStroke(1.2f));
        g2.draw(new RoundRectangle2D.Double(1, 1, (getWidth() - 3),
                (getHeight() - 3), 12, 8));
        g2.setStroke(new BasicStroke(1.5f));
        g2.drawLine(4, getHeight() - 3, getWidth() - 4, getHeight() - 3);

        g2.dispose();
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.getContentPane().setLayout(new FlowLayout());

        XrButton xrButton = new XrButton("XrButton");
        JButton jButton = new JButton("JButton");

        frame.getContentPane().add(xrButton);

        frame.getContentPane().add(jButton);

        frame.setSize(150, 150);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }

    public void mouseClicked(MouseEvent e) {
    }

    public void mouseEntered(MouseEvent e) {
        mouseIn = true;
    }

    public void mouseExited(MouseEvent e) {
        mouseIn = false;
    }

    public void mousePressed(MouseEvent e) {
    }

    public void mouseReleased(MouseEvent e) {
    }

Answer 1

I think you’ve got 2 choices here:

1.Implement drawing yourself in a paint method of your component

2.Create new ButtonUI for your look and feel. In this case i would suggest to use Synch LAF

In both cases drawing different states is your resposibility