GridBagLayout - strange resize behaviour
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Hi there,

I have done a Swing application using GridBagLayout - looks good,
works fine - but, there is this strange resize behavior.

I have JLabels followed by JTextFields togehter on a JPanel. I reduced
it to 3 rows on the grid.

The Labels are aligned left and don't change their size by resizing,
only the TextFields do.

The problem goes like this:

when I resize the frame horizontally it happens that the space between
the Labels and the Panel, which is 0 pxl, jumps to 1 maybe 2 pxl.

It does not happen every resize, just keep resizing and it will
appear.

thanks for your help

nihil baxter
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import javax.swing.*;
import java.awt.*;

public class GBLTest {

   public void init(JPanel panel) {
       Dimension defaultDim = new Dimension(120,20);
       panel.setLayout(new BorderLayout());
       JPanel grid = new JPanel(new GridBagLayout());
       GridBagConstraints cons = new GridBagConstraints();

       JLabel label;
       JTextField textField;

       cons.fill = GridBagConstraints.HORIZONTAL;
       cons.anchor = GridBagConstraints.NORTH;
       //Row 1
       label = new JLabel("Label 1");
       label.setPreferredSize(defaultDim);
       label.setMinimumSize(defaultDim);

       cons.gridy = 0;
       cons.gridx = 0;
       cons.weightx = 0;
       grid.add(label,cons);
       //--
       textField = new JTextField();
       textField.setPreferredSize(defaultDim);
       textField.setMinimumSize(defaultDim);

       cons.gridx = GridBagConstraints.RELATIVE;
       cons.weightx = 0.5;
       grid.add(textField,cons);

       //Row 2
       label = new JLabel("Label 2");
       label.setPreferredSize(defaultDim);
       label.setMinimumSize(defaultDim);

       cons.gridy = 1;
       cons.gridx = 0;
       cons.weightx = 0;
       grid.add(label,cons);
       //--
       textField = new JTextField();
       textField.setPreferredSize(defaultDim);
       textField.setMinimumSize(defaultDim);

       cons.gridx = GridBagConstraints.RELATIVE;
       cons.weightx = 0.5;
       grid.add(textField,cons);
       //--
       textField = new JTextField();
       textField.setPreferredSize(defaultDim);
       textField.setMinimumSize(defaultDim);

       cons.gridx = GridBagConstraints.RELATIVE;
       grid.add(textField,cons);

       //Row 3
       label = new JLabel("Label 3");
       label.setPreferredSize(defaultDim);
       label.setMinimumSize(defaultDim);

       cons.gridy = 2;
       cons.gridx = 0;
       cons.weightx = 0;
       grid.add(label,cons);
       //--
       textField = new JTextField();
       textField.setPreferredSize(defaultDim);
       textField.setMinimumSize(defaultDim);

       cons.gridx = GridBagConstraints.RELATIVE;
       cons.weightx = 0.5;
       grid.add(textField,cons);
       //--
       textField = new JTextField();
       textField.setPreferredSize(defaultDim);
       textField.setMinimumSize(defaultDim);

       cons.gridx = GridBagConstraints.RELATIVE;
       grid.add(textField,cons);
       //--
       textField = new JTextField();
       textField.setPreferredSize(defaultDim);
       textField.setMinimumSize(defaultDim);

       cons.gridx = GridBagConstraints.RELATIVE;
       grid.add(textField,cons);

       panel.add(grid,BorderLayout.NORTH);
   }

   public static void main(String[] args) {
       JFrame frame = new JFrame("GridBagLayoutTest");
       frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
       GBLTest gblTest = new GBLTest();
       gblTest.init((JPanel)frame.getContentPane());
       frame.pack();
       frame.show();
   }
}