guidemo6.java

java程序设计语言源代码

//Example 5 of Chapter 5

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

public class GUIDemo6 extends JFrame
{
	public static void main(String args[])
	{
		JFrame jf = new JFrame("GridBagLayout布局管理器演示");
		JPanel container = new JPanel();
		jf.setContentPane(container);

		GridBagLayout gridbag = new GridBagLayout();
		container.setLayout(gridbag);
		
		GridBagConstraints c = new GridBagConstraints();
		
		JButton jb[] = new JButton[14];
		
		String s[] = {"第一","第二","第三","第四","第五","第六","第七",
			"第八","第九","第十","第十一","第十二","第十三","第十四"};
		
		for(int i=0;i<jb.length;i++)jb[i] = new JButton(s[i]);
		
		//在水平方向和垂直方向上同时调整组件大小
		c.fill = GridBagConstraints.BOTH;
		
		//令所有的列的权重均为1.0
		c.weightx = 1.0;
		
		//以缺省值定义三个按钮的位置和大小
		gridbag.setConstraints(jb[0], c);
		container.add(jb[0]);
		
		gridbag.setConstraints(jb[1], c);
		container.add(jb[1]);
		
		gridbag.setConstraints(jb[2], c);
		container.add(jb[2]);
		
		//将"第四"按钮定义为该行中的最后一个组件
		c.gridwidth = GridBagConstraints.REMAINDER;
		gridbag.setConstraints(jb[3], c);
		container.add(jb[3]);
		
		//定义"第五"按钮的宽为2，高为2
		c.gridwidth = 2;
		c.gridheight = 2;
		gridbag.setConstraints(jb[4], c);
		container.add(jb[4]);
		
		//定义"第六"按钮的宽为4，高为1
		c.gridwidth = GridBagConstraints.REMAINDER;
		c.gridheight = 1;
		gridbag.setConstraints(jb[5], c);
		container.add(jb[5]);
		
		//定义"第七"按钮的宽为3，位置由参数确定
		c.gridwidth = 3;
		
		c.gridx = 2;
		c.gridy = 2;
		gridbag.setConstraints(jb[6], c);
		container.add(jb[6]);
		
		//定义"第八"按钮的宽为1，位置由参数确定
		c.gridwidth = 1;
		
		c.gridx = 5;
		c.gridy = 2;
		gridbag.setConstraints(jb[7], c);
		container.add(jb[7]);
		
		//定义"第九"按钮的宽为3，高为3，位置由参数确定
		c.gridwidth = 3;
		c.gridheight = 3;
		
		c.gridx = 0;
		c.gridy = 3;
		gridbag.setConstraints(jb[8], c);
		container.add(jb[8]);
		
		//定义按钮的宽为1，高为1
		c.gridwidth = 1;
		c.gridheight = 1;
		
		c.gridx = 3;
		c.gridy = 3;
		gridbag.setConstraints(jb[9], c);
		container.add(jb[9]);
		
		c.gridx = 4;
		c.gridy = 3;
		gridbag.setConstraints(jb[10], c);
		container.add(jb[10]);
		
		c.gridx = 5;
		c.gridy = 3;
		gridbag.setConstraints(jb[11], c);
		container.add(jb[11]);
		
		//定义按钮的宽为3
		c.gridwidth = 3;
		
		c.gridx = 3;
		c.gridy = 4;
		gridbag.setConstraints(jb[12], c);
		container.add(jb[12]);
		
		c.gridx = 3;
		c.gridy = 5;
		gridbag.setConstraints(jb[13], c);
		container.add(jb[13]);
		
		jf.pack();
		jf.setVisible(true);
		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	}
}