Name: el35337 Date: 06/04/98


I'm using Swing 1.0.2.

If one places a lone JTable within a JScrollPane in a GridBagLayout with the constraints given in the code below, it does not paint and it should.

However, if one adds a JPanel (in this case
panel2) to the layout, the JScrollPane does
display.

To guarantee that the problem is with the
JScrollPane and not the way the GridBag layout
is configured, one can swap out the JScrollPane
and use a JPanel instead, and it works fine.
That is, comment out the JScrollPane section
and the Panel2 section. Panel1, which has
the same constraints as the JScrollPane, displays
just fine.


import java.awt.*;
import com.sun.java.swing.*;
import com.sun.java.swing.table.*;


public class tableDisappears extends JFrame {
  public tableDisappears(){
  }
  
  public static void main(String args[]) {
    tableDisappears f = new tableDisappears();

    GridBagLayout gridBag = new GridBagLayout();
    f.getContentPane().setLayout(gridBag);

    //---------JTable within JScrollPane ---------
    JTable table = new JTable();
    JScrollPane scrollPane = new JScrollPane(
      table,
      JScrollPane.VERTICAL_SCROLLBAR_NEVER,
      JScrollPane.HORIZONTAL_SCROLLBAR_NEVER
    );
    scrollPane.setColumnHeaderView(table.getTableHeader());

    TableModel tm = table.getModel();
    ((DefaultTableModel)tm).addColumn("Column1");

    GridBagConstraints scrollPaneConstraints = new GridBagConstraints();
    scrollPaneConstraints.weightx = 1.0;
    scrollPaneConstraints.weighty = 0.0;
     
    scrollPaneConstraints.gridx = 1;
    scrollPaneConstraints.gridy = 0;
    scrollPaneConstraints.fill = GridBagConstraints.HORIZONTAL;
    scrollPaneConstraints.anchor = GridBagConstraints.NORTH;
    scrollPaneConstraints.gridheight = 2;
    gridBag.setConstraints(scrollPane,scrollPaneConstraints);

    f.getContentPane().add(scrollPane);
    //--------------------------------------------

    /*---------First JPanel-----------------------
    JPanel panel1 = new JPanel();

    panel1.add(new JLabel("test1"));
    
    panel1.setBackground(Color.red);

    GridBagConstraints panel1Constraints = new GridBagConstraints();
    panel1Constraints.weightx = 1.0;
    panel1Constraints.weighty = 0.0;
     
    panel1Constraints.gridx = 1;
    panel1Constraints.gridy = 0;
    panel1Constraints.fill = GridBagConstraints.HORIZONTAL;
    panel1Constraints.anchor = GridBagConstraints.NORTH;
    panel1Constraints.gridheight = 2;
    gridBag.setConstraints(panel1,panel1Constraints);

    f.getContentPane().add(panel1);
    ---------------------------------------------*/
    
    //---------Second JPanel-----------------------
    JPanel panel2 = new JPanel();

    panel2.add(new JLabel("test2"));
    
    panel2.setBackground(Color.green);

    GridBagConstraints panel2Constraints = new GridBagConstraints();
    panel2Constraints.weightx = 0.0;
    panel2Constraints.weighty = 1.0;
     
    panel2Constraints.gridx = 2;
    panel2Constraints.gridy = 0;
    panel2Constraints.fill = GridBagConstraints.BOTH;
    panel2Constraints.gridwidth = GridBagConstraints.RELATIVE;
    panel2Constraints.gridheight = GridBagConstraints.REMAINDER;
  
    gridBag.setConstraints(panel2,panel2Constraints);

    f.getContentPane().add(panel2);
    //---------------------------------------------

    f.setSize(100,100);
    f.show();
  }
}
(Review ID: 32823)
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