picbutton.java

java applet实用编程教程第一部分,非常好的applet源代码

import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;

public class PicButton extends Applet implements MouseListener
{
  private int width,height;
  private Image offI,img,img1,img2;
  private Graphics offG;
  private MediaTracker imageTracker;
  private boolean isMouseEnter = false, isPress = false;
  private Color ButtonColor=Color.yellow,lightC,darkC;
  private URL url;
  private AudioClip sound1, sound2;
  private String param;
  
  public void init(){
  
    param = new String();
    
    param = getParameter("sound1");
    if(param == null)
       param = "1.au";
    sound1 = getAudioClip(getDocumentBase(), param); 
    
    param = getParameter("sound2");
    if(param == null)
       param = "2.au";
    sound2 = getAudioClip(getDocumentBase(), param);
    
    width = getSize().width;
    height = getSize().height;    
    

    param = getParameter("URL");
    try{
       url = new URL(param);
    }catch(MalformedURLException e){}
    
    offI = createImage(width,height);
    offG = offI.getGraphics();
    imageTracker = new MediaTracker(this);
//    img = new Image();
    param = getParameter("Images");
    img = getImage(getCodeBase(), param);
    imageTracker.addImage(img, 0);

    param = getParameter("Images1");
    img1 = getImage(getCodeBase(), param);
    imageTracker.addImage(img1, 0);

    param = getParameter("Images2");
    img2 = getImage(getCodeBase(), param);
    imageTracker.addImage(img2, 0);
   
    try{
       imageTracker.waitForID(0);
    }catch(InterruptedException e){}


    addMouseListener(this);
  }
  
  public void start(){
   offG.drawImage(img,0,0,width,height,this);
   repaint();
  }
  
 public void mouseClicked(MouseEvent e){
    
 }



 public void mousePressed(MouseEvent e){
    offG.drawImage(img2,0,0,width,height,this);
    repaint();
    sound1.play();
       System.out.println("sound2 play");


 }



 public void mouseReleased(MouseEvent e){
    offG.drawImage(img1,0,0,width,height,this);
    repaint();
    sound2.play();
    getAppletContext().showDocument(url);
 }



 public void mouseEntered(MouseEvent e){
    offG.drawImage(img1,0,0,width,height,this);
    repaint();
 
 }



 public  void mouseExited(MouseEvent e){
    offG.drawImage(img,0,0,width,height,this);
    repaint();
 }
  
  
  public void paint(Graphics g)
  {
    g.drawImage(offI,0,0,width,height,this);
  }
  


  
}