🚀 go-pugleaf

Hi,

I don't think I can explain, but I've had some trouble with a scrolling
JList and finally got it to work. I suggest that you replace "the problem"-
row with something like:

	jList.setVisibleRowCount(8);
	jList.setFixedCellWidth(200);

I also had to place the JScrollPane inside a standard JPanel (with
default FlowLayout) to get it size correctly.

Regards
Erik Annmo


In article <72fu3o$d5n28@forums.borland.com>,
  "Dave Howorth" <5bx@iname.com> wrote:
> I wrote:
> >(1) When I make the dialog taller (as a user, dragging it at runtime), the
> >list [I assume] expands, adding white space after the end of the list. This
> >is fine. But when I then make the dialog box slightly shorter, a scroll bar
> >is added and I can scroll to a completely blank area. What should happen,
> >IMHO, is for the JList to remove the blank space and just become
> 'naturally'
> >shorter, still with no scroll bar. What am I missing?
>
> I've got a little further with this, and I attach some simple source below
> that demonstrates the problem.  It doesn't seem to matter what the window
> type is, nor what layout manager is used. A standard JB app shell creates a
> MyFrame. If the line marked /* THE PROBLEM */ is commented out, it runs OK;
> with it in, it shows the problem above.
>
> Can anybody explain this to me, please?
>
> Thanks, Dave
>
> package ListTests;
>
> import java.awt.*;
> import java.awt.event.*;
> import com.sun.java.swing.*;
>
> public class MyFrame extends JFrame
> {
>     //Construct the frame
>     JList jList = new JList(new String[] {"one", "two", "three"});
>     JScrollPane jScrollPane = new JScrollPane();
>
>     public MyFrame()
>     {
>         enableEvents(AWTEvent.WINDOW_EVENT_MASK);
>         try
>         {
>             jbInit();
>         }
>         catch (Exception e)
>         {
>             e.printStackTrace();
>         }
>     }
>
>     //Component initialization
>     private void jbInit() throws Exception
>     {
>         jList.setPreferredSize(new Dimension(50, 50)); /* THE PROBLEM */
>         jScrollPane.getViewport().add(jList, null);
>         this.getContentPane().add(jScrollPane, null);
>     }
>
>     //Overriden so we can exit on System Close
>     protected void processWindowEvent(WindowEvent e)
>     {
>         super.processWindowEvent(e);
>         if (e.getID() == WindowEvent.WINDOW_CLOSING)
>             System.exit(0);
>     }
> }
>
> /*****************/
>
> PS  I went to the bookshop yesterday and looked at the O'Reilly Java Swing
> book.  Naturally, I looked at their first JList example and spotted a bug
> (they didn't bind the model to the view).  Didn't inspire much confidence in
> the book :-(  Are there any better ones?
>
>

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