CIS 260 TestGridBagLayout7.java

Code

/*
    TestGridBagLayout7.java
    CIS 260
    2006-02-22
    David Klick

    Demonstration of GridBagLayout using "anchor" settings
    to place components in specific sections of the area
    they are in.
*/

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

public class TestGridBagLayout7 extends JFrame {
    public static void main(String[] args) {
        TestGridBagLayout7 app = new TestGridBagLayout7();
        app.setDefaultCloseOperation(EXIT_ON_CLOSE);
        app.init();
    }

    public void init() {
        int i;
        JButton btn[] = new JButton[4];
        Container c = getContentPane();
        c.setLayout(new GridBagLayout());
        GridBagConstraints gb = new GridBagConstraints();

        for (i=0; i<btn.length; i++) {
            btn[i] = new JButton("Button #" + (i+1));
        }

        gb.insets = new Insets(2, 2, 2, 2);
        gb.weightx = 1.0; gb.weighty = 1.0;
        gb.gridheight = 2;
        gb.gridwidth = 2;
        gb.gridx = 0; gb.gridy = 0;
        gb.anchor = GridBagConstraints.SOUTHWEST;
        c.add(btn[0], gb);
        gb.weightx = 0.5; gb.weighty = 1.0;
        gb.gridheight = 1;
        gb.gridwidth = 1;
        gb.gridx = 2; gb.gridy = 0;
        gb.anchor = GridBagConstraints.NORTHEAST;
        c.add(btn[1], gb);
        gb.weightx = 0.5; gb.weighty = 1.0;
        gb.gridx = 2; gb.gridy = 1;
        gb.anchor = GridBagConstraints.SOUTH;
        c.add(btn[2], gb);
        gb.weightx = 1.0; gb.weighty = 0.5;
        gb.gridheight = 1;
        gb.gridwidth = 3;
        gb.gridx = 0; gb.gridy = 2;
        gb.anchor = GridBagConstraints.CENTER;
        c.add(btn[3], gb);

        setSize(300, 200);
        setVisible(true);      
    }
}