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);
            }
            
        });
    }

}