canvaspanel.java

《j2ee开发全程实录》随书源码

package com.cownew.ctk.ui.swing;

import java.awt.Graphics;
import java.awt.LayoutManager;
import java.util.ArrayList;
import java.util.List;

import javax.swing.JPanel;

public class CanvasPanel extends JPanel
{

	private static final long serialVersionUID = 1L;
	private List paintListenrList ;

	public CanvasPanel()
	{
		super();
		paintListenrList = new ArrayList();
	}

	public CanvasPanel(boolean isDoubleBuffered)
	{
		super(isDoubleBuffered);
	}

	public CanvasPanel(LayoutManager layout)
	{
		super(layout);
	}

	public CanvasPanel(LayoutManager layout, boolean isDoubleBuffered)
	{
		super(layout, isDoubleBuffered);
	}
	
	public void addPaintListener(PaintListener listener)
	{
		paintListenrList.add(listener);
	}
	
	public void paint(Graphics g)
	{
		super.paint(g);
		for(int i=0,n=paintListenrList.size();i<n;i++)
		{
			PaintListener listener = (PaintListener) paintListenrList.get(i);
			listener.paint(g);
		}
	}

}