mylayout.java

一个关于java图形界面元素布局管理器使用方法的小程序

package layoutManage;
import java.awt.*;
import java.awt.event.*;

public class MyLayout implements ActionListener 
{  
	static CardLayout myCard=new CardLayout();
	static Panel p1=new Panel();
   public static void main(String args[])
   {
	   int i;
	   MyCanvas my[]=new MyCanvas[21];
	   p1.setLayout(myCard);
	   //MyCanvas c;
	   for(i =1;i<=20;i++)
	   {
		   my[i]=new MyCanvas(i,i);
		   p1.add("I am"+i,my[i]);
	   }
	   Panel p2=new Panel();
	   p2.setLayout(new FlowLayout());
	   Button b1=new Button("第一张");
	   Button b2=new Button("下一张");
	   Button b3=new Button("最后一张");
	   p2.add(b1);
	   p2.add(b2);
	   p2.add(b3);
	   //对各个按钮注册监听器
	   b1.addActionListener(new MyLayout());
	   b2.addActionListener(new MyLayout());
	   b3.addActionListener(new MyLayout());
	   Frame f=new Frame("请看我的图画效果！");
	   f.setLayout(new BorderLayout());
	   f.add(p1,"Center");
	   f.add(p2,"South");
	   f.setBounds(0, 0, 260, 200);
	   f.addWindowListener(new CloseFrame());
	   f.setVisible(true);
   }
  

public void actionPerformed(ActionEvent e)
{
	// TODO 自动生成方法存根
	if(e.getActionCommand()=="第一张")
		myCard.first(p1);
	if(e.getActionCommand()=="下一张")
		myCard.next(p1);
	if(e.getActionCommand()=="最后一张")
		myCard.last(p1);
}
}


class CloseFrame implements WindowListener
{
	public void windowClosing(WindowEvent e)
	{
		System.exit(1);
	}
	public void windowClosed(WindowEvent e)
	{
	    	
	}
	public void windowActivated(WindowEvent e){}
	public void windowDeactivated(WindowEvent e){}
	public void windowClosee(WindowEvent e){}
	public void windowOpened(WindowEvent e){}
	public void windowIconified(WindowEvent e){}
	public void windowDeiconified(WindowEvent e){}
}

class MyCanvas extends Canvas
   {
	   int x,y;
	   MyCanvas(int x,int y)
	   {
		   this.x=x;
		   this.y=y;
		   this.getSize();
	   }
	   public void paint(Graphics g)
	   {
		   g.setColor(Color.red);
		   g.drawString("我是第"+x,20,20);
		   g.fillOval(50, 50, 4*x, 4*y);
	   }
	   public Dimension getPreferredSize()
	   {
		  return new Dimension(200,200);   
	   }
   }