A frame, 3 Panels and a button.

[john von]

Im new to GUI and having problem on repainting a panel.

I have 4 classes. Namely, MainFrame(JFrame subclass), NorthPanel(JPanel), CenterPanel(JPanel) and SouthPanel(JPanel).

MainFrame holds the 3 panels(classes) in a BorderLayout.
Now, SouthPanel has a button and an action listener that suppose to repaint the CenterPanel. So how would i call it or repaint repaint the CenterPanel inside the MainFrame? And where should i call the repaint?

I know this is really simple to you guys. Thanks in advance!

Thanks!
[ July 20, 2004: Message edited by: john von ]

[Serghei Jelauc]

Hi.
As I understood you created instances of the panels in class that extends JFrame. You can create in you SouthPanel class constructor that will receive an object of MainFrame type, and in you ActionListener for the button you can call the repaint() method of MainFrame type object.
Something like this.

public class MainFrame extends JFrame
{
 private SouthPanel southPanel;
 public MainFrame()
 {
   southPanel = new SouthPanel(this);
   // rest of your code
 }
}
 
puvlic class SouthPanel extends JPanel implements ActionListener
{
 private MainFrame mainFrame;
 private JButton button = new JButton("My Button");
 
 public SouthPanel(MainFrame mainFrame)
 {
   this.mainFrame = mainFrame;
   button.addActionListener(this);
 }
 
 public void actionPerformed(ActionEvent e)
 {
   //do something
   mainFrame.repaint();
 }
}

Hope it will help
[ July 21, 2004: Message edited by: Serghei Jelauc ]

[john von]

There actually 2 panels and a frame involved(3 classes). There is CenterPanel that should be repainted. But the button that will trigger repaint is in SouthPanel. You almost had it.

So how? Thanks again!

[john von]

Any help?