Re: Horizontally scrolling JTable

From:

totentanz.bbs@bbs.cs.nthu.edu.tw (???F???O)

Newsgroups:

comp.lang.java.gui

Date:

18 Nov 2011 14:45:21 GMT

Message-ID:

<A17CCRS1$j_gui@bbs.cs.nthu.edu.tw>

Here is a likely looking one, though Sun
marked it 'Closed, not a bug' (shrugs). *
<http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4194022>

using a slight variant of the advice
on that page, I came up with this (very
hackish looking) code that seems to behave
as we might expect..

            public boolean getScrollableTracksViewportWidth(){
                 return isThinnerThanParent();
            }

            boolean isThinnerThanParent() {
                if (parent==null) {
                    parent = getParent();
                }
                Dimension d1 = getSize();
                Dimension d2 = parent.getSize();

                return (d1.width<=d2.width);
            }
        };
         table.setAutoResizeMode(
             JTable.AUTO_RESIZE_ALL_COLUMNS);
         JScrollPane scrollPane = new JScrollPane(table);

         add(scrollPane, BorderLayout.CENTER);
     }

Does that work for you?

Thanks Andrew, yes that works the way I wanted.

Before I read your latest posting I'd also been hunting in the bugs
database as you suggested ...

Searching Sun's Bug database led me (eventually) to Bug 4127936 reported
10-APR-1998 and marked "In progress, bug", "Evaluation: ... needs to be
fixed before FCS with JDK1.2." :-o

There are several suggested workarounds in the commentary. For future
readers of this thread: apart the workaround which Andrew found (see
above), another workaround that I tried was ...

....
             scrollPane.addComponentListener(new
                 CorrectStrangeBehaviourListener(table, scrollPane));
....

     /**
      *
      * @author dbeutner 16-MAY-2002
      * See Sun Java bug report 4127936.
      * Amended 29/3/2007 by RedGrittyBrick to add
      * constructor with parameters
      *
      */
     private class CorrectStrangeBehaviourListener
             extends ComponentAdapter {

         private JTable table;

         private JScrollPane scrollPane;

         CorrectStrangeBehaviourListener(JTable table,
                 JScrollPane scrollPane) {
             this.table = table;
             this.scrollPane = scrollPane;
         }

         public void componentResized(ComponentEvent e) {
             if (table.getPreferredSize().width
                     <= scrollPane.getViewport()
                            .getExtentSize().width) {
                 table.setAutoResizeMode(JTable.AUTO_RESIZE_ALL_COLUMNS);
             } else {
                 table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
             }
         }
     }

The one Andrew found is shorter but since I have several tables it may
be worth me putting the bulk of the workaround code into a separate
class as the above example does.

Thanks again Andrew.
--
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