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  1. JDK
  2. JDK-6422966

Editable JComboBox.setPrototypeDisplayValue: size can not be smaller than editor

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      Description

      FULL PRODUCT VERSION :
      java version "1.6.0-beta"
      Java(TM) 2 Runtime Environment, Standard Edition (build 1.6.0-beta-b59g)
      Java HotSpot(TM) Client VM (build 1.6.0-beta-b59g, mixed mode)

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

      A DESCRIPTION OF THE PROBLEM :
      Same problem for earlier JDKs.

      If a JComboBox is editable, the default width of the editor component (JTextField)
      is 9 columns. The method setPrototypeDisplayValue can not be used
      to make the JComboBox smaller than the editor.

      Suggestions:
      Allow setPrototypeDisplayValue to affect the size of the editor,
      or document the setPrototypeDisplayValue method to
      indicate its limitaions when used with an editable JComboBox .

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      See sample code.

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      I would expect the setPrototypeDisplayValue method to work as documented.
      ACTUAL -
      setPrototypeDisplayValue can not be used to create a preferred size that is
      smaller then the editor components prefered size.


      REPRODUCIBILITY :
      This bug can be reproduced always.

      ---------- BEGIN SOURCE ----------
      package swing;

      import java.awt.*;
      import java.awt.event.*;

      import javax.swing.*;

      /**
       * Editable JComboBox prerred size problem.
       */
      public class TestJComboBox
      {
          public static void main(String[] args)
          {
              JPanel contents = new JPanel(new FlowLayout());
              
              // This combo gets a proper peferred size.
              JComboBox box1 = new JComboBox(new String[] {"one", "two", "MMM"});
              box1.setPrototypeDisplayValue("MMM");

              // This editable combo does not get a proper peferred size.
              JComboBox box2 = new JComboBox(new String[] {"one", "two", "MMM"});
              box2.setEditable(true);
              box2.setPrototypeDisplayValue("MMM");
              
              contents.add(box1);
              contents.add(box2);
              
              
              
              JFrame frame = new JFrame("Test");
              frame.addWindowListener(new WindowAdapter()
              {
                  public void windowClosing(WindowEvent e)
                  {
                      System.exit(0);
                  }
              });
              frame.setContentPane(contents);
              frame.pack();
              frame.setSize(400,400);
              frame.setVisible(true);
          }
      }

      ---------- END SOURCE ----------

      CUSTOMER SUBMITTED WORKAROUND :
      For an editable combo, handle the preferred size by tweaking the default editor.
      i.e.
      ((JTextField)box2.getEditor().getEditorComponent()).setColumns(3);

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            • Assignee:
              Unassigned
              Reporter:
              ndcosta Nelson Dcosta
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