test.java

《Java2图形设计卷II：Swing》配套光盘源码

import javax.swing.*;
import javax.swing.border.*;
import javax.swing.plaf.basic.*;
import java.awt.*;
import java.awt.event.*;

public class Test extends JApplet {
	private String s = new String();

	public void init() {
		Container contentPane = getContentPane();
		JButton button = new JButton(new ImageIcon("punch.gif"));

		button.setUI(new PopOutButtonUI());
		contentPane.setLayout(new FlowLayout());
		contentPane.add(button);

		button.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				showStatus(s += '+');
			}
		});
	}
}
class PopOutButtonUI extends BasicButtonUI { 
	public void installUI(JComponent c) {
		AbstractButton button = (AbstractButton)c;
		Border border = button.getBorder();

		ImageIcon icon = (ImageIcon)button.getIcon();
		int iconW = icon.getIconWidth();
		int iconH = icon.getIconHeight();

		Image scaled = icon.getImage().getScaledInstance(
							iconW + (iconW/3),
							iconH + (iconH/3),
							Image.SCALE_SMOOTH);

		c.putClientProperty("oldBorder", border);
		c.setBorder(null);

		button.setRolloverIcon(new ImageIcon(scaled));
		installListeners(button);
	}
	public void uninstallUI(JComponent c) {
		Border border = (Border)c.getClientProperty("oldBorder");

		c.putClientProperty("oldBorder", null);
		c.setBorder(border);
		uninstallListeners((AbstractButton)c);
	}
	public Dimension getPreferredSize(JComponent c) {
		Dimension ps = super.getPreferredSize(c);

		ps.width += ps.width/3;
		ps.height += ps.height/3;

		return ps;
	}
	public boolean contains(JComponent c, int x, int y) {
		AbstractButton button = (AbstractButton)c;
		ButtonModel model = button.getModel();
		Icon icon = getIcon(button, model);

		Rectangle iconBounds = new Rectangle(
				  0,0,icon.getIconWidth(),icon.getIconHeight());

		return iconBounds.contains(x,y);
	}
	public void paint(Graphics g, JComponent c) {
		AbstractButton button = (AbstractButton)c;
		ButtonModel model = button.getModel();

		Icon icon = getIcon(button, model);
		Insets insets = c.getInsets();

		icon.paintIcon(c,g,insets.left,insets.top);
	}
	private Icon getIcon(AbstractButton b, ButtonModel m) {
		return (m.isRollover() && ! m.isPressed()) ?
			    b.getRolloverIcon() : b.getIcon();
	}
}