scrollexample3.java

一个用java开发界面的程序集(jfc核心编程)

package JFCBook.Chapter5.jdk13;

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class ScrollExample3 extends JFrame {
	public ScrollExample3() {
		super("Scroll Example 3");
		JScrollPane p = new JScrollPane(JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED,
										JScrollPane.HORIZONTAL_SCROLLBAR_AS_NEEDED);
		this.getContentPane().add(p);
		labels = new JLabel[imageNames.length];

		for (int i = 0; i < imageNames.length; i++) {
			labels[i] = new JLabel(new ImageIcon(getClass().getResource(imageNames[i])));
			labels[i].setHorizontalAlignment(SwingConstants.LEFT);
			labels[i].setVerticalAlignment(SwingConstants.TOP);		
		}

		JPanel pictures = new JPanel();
		pictures.setLayout(new GridBagLayout());
		GridBagConstraints c = new GridBagConstraints();
		c.gridwidth = 1;
		c.gridheight = 1;
		c.gridx = 0;
		c.gridy = 0;
		c.insets = new Insets(4, 4, 4, 4);
		c.fill = GridBagConstraints.BOTH;

		for (int i = 0; i < labels.length; i++) {
			pictures.add(labels[i], c);
			c.gridx++;
			if ((c.gridx % 3) == 0) {
				c.gridx = 0;
				c.gridy++;
			}
		}

		p.setViewportView(pictures);
		p.getViewport().setScrollMode(JViewport.BLIT_SCROLL_MODE);  		
	}

	public static void main(String[] args) {
		JFrame f = new ScrollExample3();
		f.setSize(250, 200);
		f.setVisible(true);
		f.addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
	}

	private static final String[] imageNames = {
								"images/p1.jpg", "images/p2.jpg", "images/p3.jpg",
								"images/p4.jpg", "images/p5.jpg", "images/p6.jpg",
								"images/p7.jpg", "images/p8.jpg", "images/p9.jpg" };
	private JLabel[] labels;
}