Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-6442918

REGRESSION: Empty column headers in JTable are rendered incorrectly

    Details

    • Subcomponent:
    • Introduced In Version:
      6
    • Resolved In Build:
      b96
    • CPU:
      x86
    • OS:
      windows_xp

      Description

      FULL PRODUCT VERSION :
      java version "1.6.0-beta2"
      Java(TM) SE Runtime Environment (build 1.6.0-beta2-b84)
      Java HotSpot(TM) Client VM (build 1.6.0-beta2-b84, mixed mode, sharing)

      ADDITIONAL OS VERSION INFORMATION :
      Microsoft Windows XP [Version 5.1.2600]

      A DESCRIPTION OF THE PROBLEM :
      If a JTable contains empty column headers and the width of these columns is quite small then the header shows superfluous abbreviation dots (...).
      This can result in a very ugly appearance of the table.
      This is a regression, since the header is rendered properly in 1.5u6 and 1.5u7.


      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Run attached source code with mustang and 1.5u7

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Abbreviation dots (...) must only be shown if column names are abbreviated. They must not be shown if the column header is empty.
      ACTUAL -
      Abbreviation dots (...) are shown for empty column headers too.

      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      import javax.swing.*;
      import javax.swing.table.*;
      import java.awt.*;

      public class JTableDemo extends JPanel {

          public JTableDemo() {
              final String[] columnNames = {"A", "B", "", "", ""};
              final String[][] data = {{"1", "2", "3", "4", "5"}};
              final JTable table = new JTable(data, columnNames);
              final DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
              final int tableCellWidth = 8 + renderer.getFontMetrics(renderer.getFont()).stringWidth("W");
              table.setPreferredScrollableViewportSize(new Dimension(5 * tableCellWidth, 50));
              add(new JScrollPane(table));
          }

          public static void main(String[] args) {
              SwingUtilities.invokeLater(new Runnable() {
                  public void run() {
                      try {
                          UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
                      } catch (Exception ignore) {
                      }
                      JFrame frame = new JFrame("JTableDemo");
                      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
                      frame.setContentPane(new JTableDemo());
                      frame.pack();
                      frame.setVisible(true);
                  }
              });
          }
      }
      ---------- END SOURCE ----------

      Release Regression From : 5.0u7
      The above release value was the last known release where this
      bug was not reproducible. Since then there has been a regression.

        Attachments

          Issue Links

            Activity

              People

              • Assignee:
                shickeysunw Shannon Hickey (Inactive)
                Reporter:
                gmanwanisunw Girish Manwani (Inactive)
              • Votes:
                0 Vote for this issue
                Watchers:
                0 Start watching this issue

                Dates

                • Created:
                  Updated:
                  Resolved:
                  Imported:
                  Indexed: