Re: Detailed GridBagLayout tutorial

From:

Knute Johnson <nospam@rabbitbrush.frazmtn.com>

Newsgroups:

comp.lang.java.programmer

Date:

Mon, 25 Sep 2006 10:45:28 -0700

Message-ID:

<qzURg.1$KM4.0@newsfe06.phx>

A. Bolmarcich wrote:

If someone is interested, I'm looking to make the following:
A JTable covering the frame 100% horizontally and about 70% vertically,
located at the very top of the frame.
Just below the JTable I will have a small JPanel that will cover 100% of
the horizontal size and 10% vertically.
Just below that JPanel I will have yet another JPanel covering the rest
of the frame.

GridBagLayout does not support allocating percentages of the container
size among the components in the container. You can get that effect
using GridBagLayout by also overriding the preferred and minimum sizes
of the components. However, it would be better to use a layout manager
that supports the type of layout that you want, such as TableLayout (see
http://java.sun.com/products/jfc/tsc/articles/tablelayout/index.html).

That's just not true. GBL is great for just that type of layout.

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

public class test extends JFrame {
     public test() {
         setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

         setLayout(new GridBagLayout());

         GridBagConstraints c = new GridBagConstraints();
         c.fill = GridBagConstraints.HORIZONTAL;

         c.weightx = .7;
         JButton b = new JButton("70%");
         add(b,c);

         c.weightx = .3;
         b = new JButton("30%");
         add(b,c);

         setSize(400,300);
         setVisible(true);
     }

     public static void main(String[] args) {
         Runnable r = new Runnable() {
             public void run() {
                 new test();
             }
         };
         EventQueue.invokeLater(r);
     }
}

--

Knute Johnson
email s/nospam/knute/