Re: GridBagLayout not beh

I have a problem with GridBagLayout that I would appreciate some help with
in solving.

In the following simple example I am trying to have a user label and text
field plus a password label and field evenly spaced across the panel with a
database field below it and a button all the way over to the right taking up
very little space. To do this I have set up a 2 x 16 grid but it's not
behaving as I believe I am specifying it. The problem is that the button is
taking up the same amount of space as the password field even though the
password field has a grid width of 4 and the button only 1. The result is
that the top line is not evenly spaced and too much room is allocated for
the button.

Why is this? What's wrong with my GridBagLayout definition or usage?

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JPasswordField;
import javax.swing.JTextField;

public class GBTest extends JFrame {

 private JPanel panel = new JPanel();
 private JLabel userLabel = new JLabel("User:");
 private JLabel passwordLabel = new JLabel("Password:");
 private JLabel dbLabel = new JLabel("Database:");
 private JTextField userTextField = new JTextField();
 private JTextField dbTextField = new JTextField();
 private JPasswordField passwordField = new JPasswordField();
 private JButton dbButton = new JButton("...");

 public GBTest() {
  setLayout(new BorderLayout());
  panel.setLayout(new GridBagLayout());

  userLabel.setText("User:");
  GridBagConstraints gbc = new GridBagConstraints();
  gbc.gridx = 0;
  gbc.gridy = 0;
  gbc.gridwidth = 4;
  gbc.anchor = GridBagConstraints.EAST;
  gbc.insets = new Insets(0, 4, 18, 0);
  gbc.ipadx = 0;
  panel.add(userLabel, gbc);

  gbc.gridx = 4;
  gbc.gridy = 0;
  gbc.gridwidth = 4;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  gbc.weightx = 0.5;
  gbc.weighty = 0.0;
  gbc.insets = new Insets(0, 4, 18, 4);
  gbc.ipadx = 40;
  panel.add(userTextField, gbc);

  gbc = new GridBagConstraints();
  gbc.gridx = 8;
  gbc.gridy = 0;
  gbc.gridwidth = 4;
  gbc.anchor = GridBagConstraints.EAST;
  gbc.insets = new Insets(0, 4, 18, 0);
  gbc.ipadx = 0;
  panel.add(passwordLabel, gbc);

  gbc.gridx = 12;
  gbc.gridy = 0;
  gbc.gridwidth = 4;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  gbc.weightx = 0.5;
  gbc.weighty = 0.0;
  gbc.insets = new Insets(0, 4, 18, 8);
  gbc.ipadx = 0;
  panel.add(passwordField, gbc);

  gbc.gridx = 0;
  gbc.gridy = 1;
  gbc.gridwidth = 4;
  gbc.anchor = GridBagConstraints.EAST;
  gbc.insets = new Insets(0, 4, 18, 0);
  gbc.ipadx = 0;
  panel.add(dbLabel, gbc);

  gbc.gridx = 4;
  gbc.gridy = 1;
  gbc.gridwidth = 11;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  gbc.weightx = 10;
  gbc.weighty = 0.0;
  gbc.insets = new Insets(0, 4, 18, 0);
  gbc.ipadx = 0;
  panel.add(dbTextField, gbc);

  gbc.gridx = 15;
  gbc.gridy = 1;
  gbc.gridwidth = 1;
  gbc.fill = GridBagConstraints.HORIZONTAL;
  gbc.anchor = GridBagConstraints.EAST;
  gbc.weightx = 0.0;
  gbc.weighty = 0.0;
  gbc.insets = new Insets(0, 4, 18, 8);
  gbc.ipadx = 0;
  panel.add(dbButton, gbc);

  add(panel, BorderLayout.CENTER);

  pack();
  setPreferredSize(new Dimension(400, 250));
  setSize(new Dimension(400, 250));
  setLocationRelativeTo(null);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 }

 public static void main(String[] args) {
  EventQueue.invokeLater(new Runnable() {
   public void run() {
    new GBTest().setVisible(true);
   }
  });
 }

}

P.S. I am using Java 6 on Windows Vista if that's relevant. It is not PLAF
dependent.

--
And loving it,

-Q
_________________________________________________
Qu0llSixF...@gmail.com
(Replace the "SixFour" with numbers to email me)