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  1. JDK
  2. JDK-4685800

JTabbedPane.setOpaque(false) does not follow opacity rules

    Details

    • Type: Enhancement
    • Status: Open
    • Priority: P4
    • Resolution: Unresolved
    • Affects Version/s: 1.4.0
    • Fix Version/s: None
    • Component/s: client-libs
    • Subcomponent:
    • Understanding:
      Fix Understood
    • CPU:
      x86
    • OS:
      windows_2000

      Description

      Name: jk109818 Date: 05/15/2002


      FULL PRODUCT VERSION :
      java version "1.4.0"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
      Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

      FULL OPERATING SYSTEM VERSION :
      Microsoft Windows 2000 [Version 5.00.2195]

      A DESCRIPTION OF THE PROBLEM :
      JTabbedPane.setOpaque(false) does not behave as it did in
      1.3. I filed this as a bug and recieved this in the
      response:

      This new behavior is part of a fix done for the 1.4
      release. Please see the following bug reports for more
      information:
      http://developer.java.sun.com/developer/bugParade/bugs/4629510.html
      AND
      http://developer.java.sun.com/developer/bugParade/bugs/4261116.html

      Seems like the fix for 4261116 could have been handled
      differently. Setting a component to transparent should do
      just that. If special behaviour is required in some cases,
      other methods could have been added to control these
      behaviours...like the border.

      Now JTabbedPane seems to violates the opacity rule by
      painting a lot of pixels that it should not need to; making
      programs that benefitted from the previous behaviour break.

      Since I am not the only one concerned about this change, I
      am resubmitting this bug as an RFE (it might fit into the
      EOU category as well, since getting the 1.3 behaviour is
      not intuitive). This way we can see which way other
      developers think this should be handled.

      In any case, it would be nice if the old functionality
      would be available without subclassing the UI.


      REGRESSION. Last worked in version 1.3.1

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      See description and sample program

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      See description and sample program

      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------

      import java.awt.*;
      import java.awt.event.*;
      import javax.swing.*;

      public class JTabbedPaneTester extends JFrame implements ActionListener {
      private JTabbedPane tabbedPane;
      private int index = 0;
      public JTabbedPaneTester() {
      JToolBar tb = new JToolBar();
      JButton b = new JButton("Add tab");
      b.addActionListener(this);
      tb.add(b);
      getContentPane().add(tb,BorderLayout.NORTH);

      tabbedPane = new JTabbedPane();

      JPanel p = new JPanel(new BorderLayout());
      p.setOpaque(true);
      p.setBackground(Color.white);
      p.add(tabbedPane,BorderLayout.CENTER);

      getContentPane().add(p,BorderLayout.CENTER);
      setSize(500,300);
      addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
      System.exit(0);
      }
      });
      show();
      }
      public void actionPerformed(ActionEvent e) {
      JPanel p = new JPanel();
      p.setLayout(new BoxLayout(p,BoxLayout.Y_AXIS));
      p.setOpaque(false);

      index++;

      JLabel l = new JLabel("Opaque label on tab " + index);
      l.setOpaque(true);
      p.add(l);

      l = new JLabel("Non opaque label on tab " + index);
      l.setOpaque(false);
      p.add(l);
      tabbedPane.add("Tab " + index,p);
      }
      public static void main(String[] argv) {
      JTabbedPaneTester t = new JTabbedPaneTester();
      }

      }
      ---------- END SOURCE ----------
      (Review ID: 146561)
      ======================================================================

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              • Assignee:
                Unassigned
                Reporter:
                jkimsunw Jeffrey Kim (Inactive)
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