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  1. JDK
  2. JDK-4429028

ListSelectionEvents aren't being thrown at every selection change

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P4
    • Resolution: Not an Issue
    • Affects Version/s: 1.3.0
    • Fix Version/s: None
    • Component/s: client-libs

      Description



      Name: boT120536 Date: 03/22/2001


      java version "1.3.0"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0-C)
      Java HotSpot(TM) Client VM (build 1.3.0-C, mixed mode)

      Full source code to reproduce the problem is at the bottom of this message. The
      important part is here:

      I configured a JTable to allow only selection of a single column at a time:

      final JTable jt = new JTable(data, columns);
      jt.setRowSelectionAllowed(false);
      jt.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
      jt.setColumnSelectionAllowed(true);

      I then wrote a ListSelectionListener with the following method:

      public void valueChanged(ListSelectionEvent e)
      {
      System.out.println(i++);
      if(jt.getSelectedColumn() != 1)
      {
      jt.clearSelection();
      }
      }

      Since the above method should be called every time the list selection changes,
      unless the column selected is 1 the selection should be cleared. However if you
      run the example code when you click column 1 and then one of the other columns,
      about 1 in 3 times you can select a column other then 1. By watching the
      console output while clicking you can see that in cases where you are allowed
      to select a column other than 1, a ListSelectionEvent did not occur.

      Full Source Code:

      import javax.swing.*;
      import javax.swing.event.*;

      public class ListSelectionBug
      {
      public static void main(String[] args)
      {
      JFrame jf = new JFrame();
      jf.setTitle("List Selection Bug Illustration");
      jf.setSize(400, 400);
      jf.setDefaultCloseOperation(jf.EXIT_ON_CLOSE);


      String[] columns = new String[] {"Column 0", "Column
      1", "Column 2", "Column 3", "Column 4"};
      String[][] data = new String[10][columns.length];
      for(int i=0; i<data.length; i++)
      {
      for(int i2=0; i2<data[0].length; i2++)
      {
      data[i][i2]=(i*i2)+"";
      }
      }
      final JTable jt = new JTable(data, columns);
      jt.setRowSelectionAllowed(false);
      jt.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
      jt.setColumnSelectionAllowed(true);
      jt.getSelectionModel().addListSelectionListener(new
      ListSelectionListener()
      {
      int i=0;
      public void valueChanged(ListSelectionEvent e)
      {
      System.out.println(i++);
      if(jt.getSelectedColumn() != 1)
      {
      jt.clearSelection();
      }
      }

      }
      );

      jf.getContentPane().add(new JScrollPane(jt));
      jf.setVisible(true);
      }
      }
      (Review ID: 119253)
      ======================================================================

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            • Assignee:
              apikalev Andrey Pikalev
              Reporter:
              bonealsunw Bret O'neal (Inactive)
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              • Created:
                Updated:
                Resolved:
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