Problem with JList and JPanels

[welshspoon]

Hiya

My problem is that I want to be able to update what is being displayed on a JPanel when an option is selected from a JList. Each item on the JList when selected adds a JPanel to the JPanel. When I run the code and select an item the JPanel appears correctly, but when I select a second from the list the second JPanel is added behind the first selected. Also, when I have managed to get the correct panel to display if i highlight over it the first displayed panel appears.

public TSettings() {
        setTitle("Learning Zone");
        setClosable(true);
        setMaximizable(true);
        setIconifiable(true);
        topPanelf = new JPanel();
        screen = new JPanel();
        topPanelf.setLayout( new BorderLayout() );
        screen.setLayout( new BorderLayout() );
        getContentPane().add( topPanelf, BorderLayout.CENTER);

        // sets propoerties of the JEditorPane for it to view web pages.
        String [] options = {"Add a User", "Remove User", "Edit User", "Add a Question", "Remove a Question", "Add a Test", "Remove a Test", "Set a Test", "View Test Marks", "Print Test", "Change Your Password"};
        topiclist = new JList(options);
        topiclist.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        topiclist.addListSelectionListener(new
        ListSelectionListener() {
            public void valueChanged(ListSelectionEvent event) {
                try {
					Object cvalue = topiclist.getSelectedValue();
					String cvaluestring = cvalue.toString();

					if (cvaluestring == ("Add a User")) {
						AddUser1 auf = new AddUser1();
						screen.add(auf);
						invalidate();
						repaint();

					} else if (cvaluestring == ("Remove User")) {
						RemoveUser ru = new RemoveUser();
						screen.add(ru);
						invalidate();
						repaint();

						}
						else if (cvaluestring == ("Edit User")) {
							EditUser eu = new EditUser();
							screen.add(eu);
							validate();

							}

						else if (cvaluestring == ("Add a Question")) {
							AddQuestion aqf = new AddQuestion();
							screen.add(aqf);
							validate();
						}
                }
                catch( Exception e ) {
                    JOptionPane.showMessageDialog(TSettings.this,
                    e, "ERROR", JOptionPane.ERROR_MESSAGE);
                }

            }
        });

Thanks in advance for any help

 

[Diancecht]

What about adding all of them when initalizing an making the correct one visible on selection?

Cheers,
Dian

 

[welshspoon]

Thanks for your reply

No that didn't work, the panels display but i can still get back to the first displayed by selecting items on the panel. I had this problem before but i can't remember how i fixed it.

Thanks again for any help given

 

[wangdong]

screen.removeAll();

Try to remove everything, before adding a new Panel.

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