Bad Checkbox UI
import java.awt.Color;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Insets;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
import javax.swing.AbstractButton;
import javax.swing.ButtonModel;
import javax.swing.Icon;
import javax.swing.JButton;
import javax.swing.JCheckBox;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicCheckBoxUI;
public class MyCheckBoxUI extends BasicCheckBoxUI implements
java.io.Serializable, MouseListener {
private final static MyCheckBoxUI buttonUI = new MyCheckBoxUI();
public MyCheckBoxUI() {
}
public static ComponentUI createUI(JComponent c) {
return buttonUI;
}
public void installUI(JComponent c) {
super.installUI(c);
c.setBackground(Color.red);
c.addMouseListener(this);
}
public void uninstallUI(JComponent c) {
super.uninstallUI(c);
c.removeMouseListener(this);
}
public void paint(Graphics g, JComponent c) {
AbstractButton b = (AbstractButton) c;
ButtonModel model = b.getModel();
Dimension d = b.getSize();
g.setFont(c.getFont());
FontMetrics fm = g.getFontMetrics();
g.setColor(Color.white);
g.drawString("Am I a check box", 10, 10);
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
}
public void mouseReleased(MouseEvent e) {
}
public void mouseEntered(MouseEvent e) {
JComponent c = (JComponent) e.getComponent();
c.setBackground(Color.blue);
c.repaint();
}
public void mouseExited(MouseEvent e) {
JComponent c = (JComponent) e.getComponent();
c.setBackground(Color.red);
c.repaint();
}
public static void main(String[] argv) {
JFrame f = new JFrame();
f.setSize(400, 300);
f.getContentPane().setLayout(new FlowLayout());
JPanel p = new JPanel();
JCheckBox bt1 = new JCheckBox("Click Me");
bt1.setUI(new MyCheckBoxUI());
p.add(bt1);
f.getContentPane().add(p);
WindowListener wndCloser = new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
};
f.addWindowListener(wndCloser);
f.setVisible(true);
}
}
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