cardlayoutuse2.java

JAVA编程思想源代码 值得一下 很难找的

package chapter11;

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

class Mycanvas extends Canvas {
	int x, y;

	Mycanvas(int a, int b) {
		x = a;
		y = b;
		setSize(100, 160);
	}

	public void paint(Graphics g) {
		g.setColor(Color.red);
		g.fillRect(50, 50, 6 * x, 6 * y);// 画长方形
	}
}

public class CardLayoutUse2 extends Applet implements ActionListener {
	CardLayout mycard;

	Button button1, button2, button3;

	Mycanvas mycanvas[];

	Panel p;

	public void init() {
		setLayout(new BorderLayout());// 小容器的布局是边界布局.
		mycard = new CardLayout();
		p = new Panel();
		p.setLayout((LayoutManager) mycard);// p 的布局设置为 mycard 卡片式布局
		button1 = new Button("small");
		button2 = new Button("middle");

		button3 = new Button("big");
		mycanvas = new Mycanvas[21];
		for (int i = 1; i <= 20; i++) {
			mycanvas[i] = new Mycanvas(i, i);
			p.add("iam" + i, mycanvas[i]);
		}
		button1.addActionListener(this);
		button2.addActionListener(this);
		button3.addActionListener(this);
		Panel p2 = new Panel();
		p2.add(button1);
		p2.add(button2);
		p2.add(button3);
		add(p, BorderLayout.CENTER);
		add(p2, BorderLayout.SOUTH);
	}

	public void actionPerformed(ActionEvent e) {
		Button b = (Button) e.getSource();
		if (b == button1) {
			mycard.first(p);
		} else if (b == button2) {
			mycard.next(p);
		} else if (b == button3) {
			mycard.last(p);

		}
	}
}