Code
class RoundButton extends JButton {
protected Shape base;
protected Shape shape
public RoundButton() {
this(null, null);
}
public RoundButton(Icon icon) {
this(null, icon);
}
public RoundButton(String text) {
this(text, null);
}
public RoundButton(Action a) {
this();
setAction(a);
}
public RoundButton(String text, Icon icon) {
setModel(new DefaultButtonModel());
init(text, icon);
if (icon == null) {
return;
}
setBorder(BorderFactory.createEmptyBorder(1, 1, 1, 1));
setBackground(Color.BLACK);
setContentAreaFilled(false);
setFocusPainted(false);
// setVerticalAlignment(SwingConstants.TOP);
setAlignmentY(Component.TOP_ALIGNMENT);
initShape();
}
protected void initShape() {
if (!getBounds().equals(base)) {
Dimension s = getPreferredSize();
base = getBounds();
shape = new Ellipse2D.Float(0, 0, s.width - 1, s.height - 1);
}
}
@Override public Dimension getPreferredSize() {
Icon icon = getIcon();
Insets i = getInsets();
int iw = Math.max(icon.getIconWidth(), icon.getIconHeight());
return new Dimension(iw + i.right + i.left, iw + i.top + i.bottom);
}
@Override protected void paintBorder(Graphics g) {
initShape();
Graphics2D g2 = (Graphics2D) g.create();
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
RenderingHints.VALUE_ANTIALIAS_ON);
g2.setColor(getBackground());
// g2.setStroke(new BasicStroke(1f));
g2.draw(shape);
g2.dispose();
}
@Override public boolean contains(int x, int y) {
initShape();
return shape.contains(x, y);
// Transparent color is 0, making it unclickable:
// or return super.contains(x, y) && ((image.getRGB(x, y) >> 24) & 0xff) > 0;
}
}
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