translucentpanel.java

java动画

/*
 * Copyright (c) 2007, Romain Guy
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   * Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *   * Redistributions in binary form must reproduce the above
 *     copyright notice, this list of conditions and the following
 *     disclaimer in the documentation and/or other materials provided
 *     with the distribution.
 *   * Neither the name of the TimingFramework project nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

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

public class TranslucentPanel extends JPanel {
    BufferedImage image = null;
    
    @Override
    public void paint(Graphics g) {
        if (image == null ||
            image.getWidth() != getWidth() ||
            image.getHeight() != getHeight()) {
            
            image = (BufferedImage) createImage(getWidth(), getHeight());
        }

        Graphics2D g2 = image.createGraphics();
        g2.setClip(g.getClip());
        super.paint(g2);
        g2.dispose();
        
        g2 = (Graphics2D) g.create();
        g2.setComposite(AlphaComposite.SrcOver.derive(0.2f));
        g2.drawImage(image, 0, 0, null);
    }

    public static void main(String... args) {

        
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JFrame f = new JFrame("Translucent Panel");
                
                f.setContentPane(new TranslucentPanel());
                f.getContentPane().setLayout(new BorderLayout());
                
                Object[] names = new Object[] {
                    "Title", "Artist", "Album"
                };
                String[][] data = new String[][] {
                    { "Los Angeles", "Sugarcult", "Lights Out" },
                    { "Do It Alone", "Sugarcult", "Lights Out" },
                    { "Made a Mistake", "Sugarcult", "Lights Out" },
                    { "Kiss You Better", "Maximo Park", "A Certain Trigger" },
                    { "All Over the Shop", "Maximo Park", "A Certain Trigger" },
                    { "Going Missing", "Maximo Park", "A Certain Trigger" }
                };
                JTable table = new JTable(data, names);
                f.add(table);
                
                JPanel p = new JPanel();
                p.add(new JButton("Play"));
                p.add(new JButton("Pause"));
                p.add(new JButton("Stop"));
                f.add(p, BorderLayout.SOUTH);
                
                f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                
                f.setSize(400, 300);
                f.setLocationRelativeTo(null);
                f.setVisible(true);
            } 
        });
    }
}