imagepanel.java

java JTree的简单应用 供初学者参考！

/*
 *作者:梅玲
 *日期:2007-3-1
*/

package newer;

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

public class ImagePanel extends JPanel
	implements ComponentListener
{
	private  String patch;
	
	public ImagePanel()
	{
		jbInt();
	}
	
	public ImagePanel(String patch)
	{
		this.patch = patch;
		jbInt();
	}
	
	private void jbInt()
	{
		this.addComponentListener(this);
	}
	
	public void paintComponent(Graphics g)
	{
		super.paintComponent(g);
		ImageIcon imgBackground = new ImageIcon(patch);
		Image image = imgBackground.getImage();
		g.drawImage(image,0,0,this.getWidth(),this.getHeight(),this);
	}
	
	public void setBackground(String patch)
	{
		this.patch = patch;
		super.repaint();
		this.repaint();
	}
	
	public void setBackground()
	{
		super.repaint();
		this.repaint();
	}
	
	// 组件变得不可见时调用。 
	public void componentHidden(ComponentEvent e) 
	{
		setBackground();
 	}
        
    // 组件位置更改时调用。     
	public void componentMoved(ComponentEvent e) 
    {
        setBackground();	
    }
    
     //组件大小更改时调用。 
 	public void componentResized(ComponentEvent e) 
 	{
 		setBackground();
 	}
    
    //  组件变得可见时调用。     
 	public void componentShown(ComponentEvent e) 
 	{
 		setBackground();
 	}
        
}