Question about Jlist
Hi,
I first created a JScrollPane.
Then I put a Jlist on that JScrollPane.
Then I add 100 elements in the Jlist
DefaultListModel listModel = new DefaultListModel();
for ( int i = 0; i<100; i++){
listModel.addElement("test" + i);
}
jList1 = new JList(listModel);
When I run the program, it automatically shows the first 17 elements. When I try to scroll down, it still shows the 17th elements .
all are 'test 17' in the screen.
Anyone knows why ?
Many thanks in advance
Ivan
[568 byte] By [
egckhada] at [2007-10-3 2:26:34]
> Anyone knows why ?
>
Difficult to say without seeing the rest of your code. Here is a short demo program that does what your program is supposed to do. Compare it with your program, and see what is different.
public class Test17 {
public static void main(String[] args) {
new Test17().run();
}
public void run() {
final JFrame f = createFrame();
EventQueue.invokeLater(new Runnable() {
public void run() {
f.pack();
f.setLocationRelativeTo(null);
f.setVisible(true);
}
});
}
private JFrame createFrame() {
JFrame f = new JFrame("Test 17");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(createList(), BorderLayout.CENTER);
return f;
}
private JComponent createList() {
ListModel model = createListModel();
JList list = new JList(model);
return new JScrollPane(list);
}
private ListModel createListModel() {
DefaultListModel model = new DefaultListModel();
for (int i = 0; i < 100; ++i) {
model.addElement("test " + i);
}
return model;
}
}
The only thing that I could think of is that the JScrollPane isn't redrawing. Try creating a thread that just calls repaint().
> Then I put a Jlist on that JScrollPane.
I'm not sure what you mean by this.
From the JList API documentation: " JList doesn't support scrolling directly. To
create a scrolling list you make the JList the viewport view of a JScrollPane. For
example: JScrollPane scrollPane = new JScrollPane(dataList);
// Or in two steps:
JScrollPane scrollPane = new JScrollPane();
scrollPane.getViewport().setView(dataList);
..."
Do you do this?
Hi,
My simplified code is as following
public class testForm extends JFrame {
...
...
private JScrollPane jScrollPane1 = new JScrollPane();
private GridLayout gridLayout3 = new GridLayout();
private JList jList1 = new JList();
public testForm() {
addWindowListener(new WindowAdapter() {public void windowClosing(WindowEvent e) {int action = _popupTransactionDialog();
if (action!=JOptionPane.CLOSED_OPTION){ panelBinding.releaseDataControl(); statusBar.release();System.exit(0);} } });
}
public void jbInit() throws Exception {
........
jScrollPane1.getViewport().setView(jList1);
jPanel2.add(jScrollPane1, null);
jScrollPane1.getViewport().setLayout(gridLayout3);
......
jList1.setModel((ListModel)panelBinding.bindUIControl("BookingView1",jList1));
}
public static void main(String [] args) {
...........
}
}
Ivan
> The only thing that I could think of is that the> JScrollPane isn't redrawing. Try creating a thread> that just calls repaint().Hi,Sorry..I am new to Java ..How to call a thread to repaint ? Ivan
Hi,I think the main difference between my code and yours is my code without the following EventQueue.invokeLater(new Runnable() {But my class extends the JFrame directly instead Where should I put this code in my java ?Thanks .Ivan
> Hi,
>
> I think the main difference between my code and
> yours is my code without the following
>
>EventQueue.invokeLater(new Runnable() {
> But my class extends the JFrame directly instead
>
>
>Where should I put this code in my java ?
>Thanks .
> Ivan
Somewhere you must call setVisible(true) on your frame, no? Wrap that call in an invokeLater and see if that helps (I'm not guaranteeing it will).
