Simple Button 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.KeyEvent;
import java.awt.event.KeyListener;
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.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.UIManager;
import javax.swing.border.Border;
import javax.swing.plaf.ComponentUI;
import javax.swing.plaf.basic.BasicButtonUI;
public class MyButtonUI extends BasicButtonUI implements java.io.Serializable,
MouseListener, KeyListener {
private final static MyButtonUI m_buttonUI = new MyButtonUI();
protected Border m_borderRaised = UIManager.getBorder("Button.border");
protected Border m_borderLowered = UIManager
.getBorder("Button.borderPressed");
protected Color m_backgroundNormal = UIManager
.getColor("Button.background");
protected Color m_backgroundPressed = UIManager
.getColor("Button.pressedBackground");
protected Color m_foregroundNormal = UIManager
.getColor("Button.foreground");
protected Color m_foregroundActive = UIManager
.getColor("Button.activeForeground");
protected Color m_focusBorder = UIManager.getColor("Button.focusBorder");
public static ComponentUI createUI(JComponent c) {
return m_buttonUI;
}
public void installUI(JComponent c) {
super.installUI(c);
c.addMouseListener(this);
c.addKeyListener(this);
}
public void uninstallUI(JComponent c) {
super.uninstallUI(c);
c.removeMouseListener(this);
c.removeKeyListener(this);
}
public void paint(Graphics g, JComponent c) {
AbstractButton b = (AbstractButton) c;
Dimension d = b.getSize();
g.setFont(c.getFont());
FontMetrics fm = g.getFontMetrics();
g.setColor(b.getForeground());
String caption = b.getText();
int x = (d.width - fm.stringWidth(caption)) / 2;
int y = (d.height + fm.getAscent()) / 2;
g.drawString(caption, x, y);
}
public Dimension getPreferredSize(JComponent c) {
Dimension d = super.getPreferredSize(c);
if (m_borderRaised != null) {
Insets ins = m_borderRaised.getBorderInsets(c);
d.setSize(d.width + ins.left + ins.right, d.height + ins.top
+ ins.bottom);
}
return d;
}
public void mouseClicked(MouseEvent e) {
}
public void mousePressed(MouseEvent e) {
JComponent c = (JComponent) e.getComponent();
c.setBorder(m_borderLowered);
c.setBackground(m_backgroundPressed);
}
public void mouseReleased(MouseEvent e) {
JComponent c = (JComponent) e.getComponent();
c.setBorder(m_borderRaised);
c.setBackground(m_backgroundNormal);
}
public void mouseEntered(MouseEvent e) {
JComponent c = (JComponent) e.getComponent();
c.setForeground(m_foregroundActive);
c.repaint();
}
public void mouseExited(MouseEvent e) {
JComponent c = (JComponent) e.getComponent();
c.setForeground(m_foregroundNormal);
c.repaint();
}
public void keyTyped(KeyEvent e) {
}
public void keyPressed(KeyEvent e) {
int code = e.getKeyCode();
if (code == KeyEvent.VK_ENTER || code == KeyEvent.VK_SPACE) {
JComponent c = (JComponent) e.getComponent();
c.setBorder(m_borderLowered);
c.setBackground(m_backgroundPressed);
}
}
public void keyReleased(KeyEvent e) {
int code = e.getKeyCode();
if (code == KeyEvent.VK_ENTER || code == KeyEvent.VK_SPACE) {
JComponent c = (JComponent) e.getComponent();
c.setBorder(m_borderRaised);
c.setBackground(m_backgroundNormal);
}
}
public static void main(String argv[]) {
JFrame f = new JFrame();
f.setSize(400, 300);
f.getContentPane().setLayout(new FlowLayout());
JPanel p = new JPanel();
JButton bt1 = new JButton("Click Me");
bt1.setUI(new MyButtonUI());
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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