使用GridBagLayout控制行列的高度和宽度

摘自http://bbs.csdn.net/topics/340189065使用GridBagLayout控制行列的高度和宽度

gridwidth指定组件显示区域的某一行中的单元格数。 默认值1，水平占一格

gridheight指定在组件显示区域的一列中的单元格数。默认值1，垂直占一格

weightx指定如何分布额外的水平空间。 默认值0，额外水平空间不分配。weighty指定如何分布额外的垂直空间。 默认值0，额外垂直空间不分配。

拉伸后效果如下

 1 package com.hw.gridbaglayout;
 2
 3 import java.awt.Button;
 4 import java.awt.Font;
 5 import java.awt.GridBagConstraints;
 6 import java.awt.GridBagLayout;
 7 import java.awt.event.WindowAdapter;
 8 import java.awt.event.WindowEvent;
 9
10 import javax.swing.JFrame;
11 import javax.swing.JPanel;
12
13 public class GridBagEx2 extends  JPanel
14 {
15     private static final long serialVersionUID = -5214441555967215113L;
16
17     protected void makebutton(String name, GridBagLayout gridbag,
18             GridBagConstraints c)
19     {
20         Button button = new Button(name);
21         gridbag.setConstraints(button, c);
22         add(button);
23     }
24
25     public void init()
26     {
27         GridBagLayout gridbag = new GridBagLayout();
28         GridBagConstraints c = new GridBagConstraints();
29
30         setFont(new Font("SansSerif", Font.PLAIN, 14));
31         setLayout(gridbag);
32
33         c.fill = GridBagConstraints.BOTH;
34         c.weightx = 1.0;
35         makebutton("Button1", gridbag, c);
36         makebutton("Button2", gridbag, c);
37         makebutton("Button3", gridbag, c);
38
39         c.gridwidth = GridBagConstraints.REMAINDER; //end row
40         makebutton("Button4", gridbag, c);
41
42         c.weightx = 0.0; //reset to the default
43         makebutton("Button5", gridbag, c); //another row
44
45         c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last in row
46         makebutton("Button6", gridbag, c);
47
48         c.gridwidth = GridBagConstraints.REMAINDER; //end row
49         makebutton("Button7", gridbag, c);
50
51         c.gridwidth = 1; //reset to the default
52         c.gridheight = 2;
53         c.weighty = 1.0;
54         makebutton("Button8", gridbag, c);
55
56         c.weighty = 0.0; //reset to the default
57         c.gridwidth = GridBagConstraints.REMAINDER; //end row
58         c.gridheight = 1; //reset to the default
59         makebutton("Button9", gridbag, c);
60         makebutton("Button10", gridbag, c);
61
62         setSize(300, 100);
63     }
64
65     public static void main(String args[])
66     {
67         JFrame f = new JFrame("GridBag Layout Example");
68         f.setLocation(400, 200);
69         GridBagEx2 ex1 = new GridBagEx2();
70
71         ex1.init();
72
73         f.add("Center", ex1);
74         f.pack();
75         f.setSize(f.getPreferredSize());
76         f.setVisible(true);
77         f.addWindowListener(new WindowAdapter()
78         {
79
80             @Override
81             public void windowClosing(WindowEvent e)
82             {
83                 System.exit(0);
84             }
85
86         });
87     }
88
89 }