Re: Swing GUI

lando wrote:


I posted this yesterday but it didn't show up. This includes an example
of how to add actions to buttons and how to do a simple layout.

import java.awt.*;
import java.awt.event.*;

public class test8 extends Frame implements ActionListener {
     TextArea ta;

     public test8() {
         addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent we) {
                 System.exit(0);
             }
         });

         setLayout(new GridBagLayout());
         GridBagConstraints c = new GridBagConstraints();
         c.gridx = c.gridy = 0; c.insets = new Insets(2,2,2,2);

         ta = new TextArea("Hello World!\n",20,80);
         Button b1 = new Button("One");
         Button b2 = new Button("Two");
         Button b3 = new Button("Three");

         b1.addActionListener(this);
         b2.addActionListener(this);
         b3.addActionListener(this);

         c.gridwidth = 3;
         add(ta,c);

         c.gridwidth = 1; ++c.gridy;
         c.weightx = 1.0; c.anchor = GridBagConstraints.EAST;
         add(b1,c);

         ++c.gridx;
         c.weightx = 0.0; c.anchor = GridBagConstraints.CENTER;
         add(b2,c);

         ++c.gridx;
         c.weightx = 1.0; c.anchor = GridBagConstraints.WEST;
         add(b3,c);

         pack();
         setVisible(true);
     }

     public void actionPerformed(ActionEvent ae) {
         String ac = ae.getActionCommand();

         if (ac.equals("One")) {
             ta.append(ac + "\n");
         } else if (ac.equals("Two")) {
             ta.append(ac + "\n");
         } else if (ac.equals("Three")) {
             ta.append(ac + "\n");
         }
     }

     public static void main(String[] args) {
         new test8();
     }
}

--

Knute Johnson
email s/nospam/knute/