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。
ipadx　　指定组件最小宽度，可确保组件不会过份缩放。

ipady　　指定组件最小高度，可确保组件不会过份缩放。

gridx　　指定组件左上角所在位置横坐标。

gridy　　指定组件左上角所在位置纵坐标。

inserts　　在组件周围增加空白区域。

anchor　　单个组件水平、垂直都不填充时，设置组件应该显示在区域的哪个方位，西北还是东南。  也就是说anchor 和fill互斥,fill优先级高

拉伸后效果如下

 package com.hw.gridbaglayout;

 import java.awt.Button;
 import java.awt.Font;
 import java.awt.GridBagConstraints;
 import java.awt.GridBagLayout;
 import java.awt.event.WindowAdapter;
 import java.awt.event.WindowEvent;

 import javax.swing.JFrame;
 import javax.swing.JPanel;

 public class GridBagEx2 extends  JPanel
 {
     private static final long serialVersionUID = -5214441555967215113L;

     protected void makebutton(String name, GridBagLayout gridbag,
             GridBagConstraints c)
     {
         Button button = new Button(name);
         gridbag.setConstraints(button, c);
         add(button);
     }

     public void init()
     {
         GridBagLayout gridbag = new GridBagLayout();
         GridBagConstraints c = new GridBagConstraints();

         setFont(new Font("SansSerif", Font.PLAIN, 14));
         setLayout(gridbag);

         c.fill = GridBagConstraints.BOTH;
         c.weightx = 1.0;
         makebutton("Button1", gridbag, c);
         makebutton("Button2", gridbag, c);
         makebutton("Button3", gridbag, c);

         c.gridwidth = GridBagConstraints.REMAINDER; //end row
         makebutton("Button4", gridbag, c);

         c.weightx = 0.0; //reset to the default
         makebutton("Button5", gridbag, c); //another row

         c.gridwidth = GridBagConstraints.RELATIVE; //next-to-last in row
         makebutton("Button6", gridbag, c);

         c.gridwidth = GridBagConstraints.REMAINDER; //end row
         makebutton("Button7", gridbag, c);

         c.gridwidth = 1; //reset to the default
         c.gridheight = 2;
         c.weighty = 1.0;
         makebutton("Button8", gridbag, c);

         c.weighty = 0.0; //reset to the default
         c.gridwidth = GridBagConstraints.REMAINDER; //end row
         c.gridheight = 1; //reset to the default
         makebutton("Button9", gridbag, c);
         makebutton("Button10", gridbag, c);

         setSize(300, 100);
     }

     public static void main(String args[])
     {
         JFrame f = new JFrame("GridBag Layout Example");
         f.setLocation(400, 200);
         GridBagEx2 ex1 = new GridBagEx2();

         ex1.init();

         f.add("Center", ex1);
         f.pack();
         f.setSize(f.getPreferredSize());
         f.setVisible(true);
         f.addWindowListener(new WindowAdapter()
         {

             @Override
             public void windowClosing(WindowEvent e)
             {
                 System.exit(0);
             }

         });
     }

 }