🚀 go-pugleaf

"Joi Ellis [TeamB]" wrote:

> Kevin Dwan <kevin@blueberry.com> wrote:
>
> > The problem may be that the default list model of a JList is immutable,
> > and I have to do something like set the JList to DefaultListModel with the
> > setModel method, and then zap the choices by operating on the instance
> > of the ListModel. I tried doing this using the ListModel's .clear()
> > and .removeAllElements() methods, but they don't seem to work as I
> > expected either.
>
> > I didn't think it would be this difficult to just erase the list.
>
> Ah, yes, you need to define your own AbstractDataModel and use one of the
> other JList constructors.  It didn't occur to me to ask which constructor
> you were using.   Have you checked Sun's tutorial pages for JList?  It
> isn't really that difficult to create a model of your own.  I've made
> several at work so far.
>
> --
> Joi Ellis (TeamB)
> No direct email, please.
> For best results, post on news server newsgroups.borland.com!

Yes, I've read the Tutorial. It says, "To create a list whose items can be
changed individually, set the list's model to an instance of a mutable list
model class, such as an insteance of DefaultListModel. You can set a list's
model when you create the list or by calling the setModel method."

This is what I tried:

JFileChooser sfc = new JFileChooser();
.
.
void approveButton_actionPerformed(ActionEvent e)
  {
    DefaultListModel hank = new DefaultListModel();
    JList1.setModel(hank);
    JList1.clearSelection(); //doesn�t clear JList1
    hank.clear();  //doesn�t clear JList1
    hank.removeAllElements();//doesn�t clear JList1
    File [] sourceFiles = sfc.getSelectedFiles();
    String[] namelist = new String [sourceFiles.length];
      for (int i = 0; i < sourceFiles.length; i++){
        namelist[i] = sourceFiles[i].getName();
          for (int a = 0; a < namelist.length; a++){
            hank.addElement(namelist[a]);
          }
      }
        JList JList1 = new JList(hank);
        //JList JList1 = new JList(namelist); //used this approach earlier
        targetPanel.add(JList1, new XYConstraints(14, 17, 210, 279));
          for (int a=0; a<JList1.getModel().getSize();a++){
            System.out.println(JList1.getModel().getElementAt(a)); //diagnostic
          }
  }

What this does is update the JList, as I can see by the System.out.println
diagnostic, but JList1 in the GUI doesn't get updated at runtime.