Java_GUI_布局_网格组布局

import java.awt.Component;
import java.awt.Container;
import java.awt.GraphicsEnvironment;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;

import javax.swing.JCheckBox;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextArea;

public class GirdBagLayoutTest
{

    public static void main(String[] args)
    {
        GirdBagLayoutFrame frame = new GirdBagLayoutFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}

class GirdBagLayoutFrame extends JFrame
{
    public GirdBagLayoutFrame()
    {
        setTitle("网格组事件");
        setSize(300, 200);

        Container con = getContentPane();
        GirdBagLayoutPanel panel = new GirdBagLayoutPanel();
        con.add(panel);
    }
}

class GirdBagLayoutPanel extends JPanel
{
    public JLabel lname, lsize;

    public JComboBox cname, csize;

    public JCheckBox bold, italic;

    public JTextArea area;

    public GirdBagLayoutPanel()
    {
        lname = new JLabel("Name");
        lsize = new JLabel("Size");
        String[] fonts = GraphicsEnvironment.getLocalGraphicsEnvironment()
                .getAvailableFontFamilyNames();

        cname = new JComboBox(fonts);
        csize = new JComboBox(new String[]
        { "8", "12", "14", "16", "18", "20", "24", "26", "36" });

        bold = new JCheckBox("Bold");
        italic = new JCheckBox("Italic");
        area = new JTextArea("欢迎来到太湖");
        area.setLineWrap(true);//自动换行
        //实例化网格组布局
        GridBagLayout layout = new GridBagLayout();
        //设置布局管理
        setLayout(layout);
        //实例化网格组布局的限制类(此类协助网格组布局类完成工作)
        GridBagConstraints constraints = new GridBagConstraints();
       
        constraints.anchor = GridBagConstraints.EAST;//居右对其
        constraints.fill = GridBagConstraints.NONE;//不填充
        constraints.weightx = 0; //水平方向不缩放
        constraints.weighty = 0; //垂直方向不缩放  0代表不缩放 100代表缩放
        addObj(constraints,0,0,1,1,lname);
        addObj(constraints,0,1,1,1,lsize);
       
        constraints.fill = GridBagConstraints.HORIZONTAL;//水平填充
        constraints.weightx = 100;//水平缩放
        addObj(constraints,1,0,1,1,cname);
        addObj(constraints,1,1,1,1,csize);
       
        constraints.weighty = 100;//垂直缩放
        constraints.fill = GridBagConstraints.NONE;//不填充
        constraints.anchor = GridBagConstraints.CENTER;//居中对其
        addObj(constraints,0,2,2,1,bold);
        addObj(constraints,0,3,2,1,italic);
       
        constraints.fill = GridBagConstraints.BOTH;//水平垂直都填充
        addObj(constraints,2,0,1,4,area);
                     
    }
   
    //方法
    public void addObj(GridBagConstraints gc,int x,int y,int w,int h,
            Component c)//传递参数 Component 主键
    {
        gc.gridx = x;
        gc.gridy = y;
        gc.gridwidth = w;
        gc.gridheight = h;
        add(c,gc);
    }
}