Setting the size of a JPanel in a BorderLayout
I have a simple JPanel (mainPanel) which has a BorderLayout. To the west I have added another JPanel (westPanel) and in the center I have added a JTextField.
On westPanel I want to use the Graphics object to render some lines onto the Panel, which I can do fine.
However, the size of westPanel is much too small for my needs (as it does not contain any other graphical objects). I have tried using setPreferredSize and setMinumumSize but to no avail.
Is there any way of setting a minimum size on westPanel, or do I have to get rid of the BorderLayout and use co-ordinates!!!
Thanks in advance,
Grant
Hi,Using co-ordinates would be too troublesome, and not flexible when you resizing your window. Perhap you should try using GridBagLayout. I personally find that GridBagLayout is easy to use, provided that you're familiar in setting the GridBagConstraint. cheers.
Don't bother with GridBagLayout, setPreferredSize should work, post your code so we can take a look.
Sorry for the delay. Here is a snippet of what I'm trying to do, can you see why the westPanel is only staying at around 5pixels even though I have set the preferred size!
thanx for and help
Grant
public class MyFrame extends JFrame
{
private WestPanel westPanel=null;
private JPanel mainPanel;
private JTextField f;
public MyFrame()
{
super();
}
public void init()
{
this.getContentPane().setLayout(new BorderLayout());
westPanel = new WestPanel();
mainPanel = new JPanel();
f = new JTextField();
mainPanel.setLayout(new BorderLayout());
this.getContentPane().add(mainPanel, BorderLayout.CENTER);
mainPanel.getContentPane().add(westPanel, BorderLayout.WEST);
mainPanel.getContentPane().add(f, BorderLayout.CENTER);
this.setSize(120, 70);
this.setVisible(true);
}
class WestPanel extends JPanel
{
public WestPanel()
{
super();
this.setPreferredSize(100, 50);
this.setMinimumSize(50, 20);
//other class specific stuff here
}
}
}
Oops!! I slightly adapted the actual code. The lines that read:
mainPanel.getContentPane().add(westPanel, BorderLayout.WEST);
mainPanel.getContentPane().add(f, BorderLayout.CENTER);
should read:
mainPanel.add(westPanel, BorderLayout.WEST);
mainPanel.add(f, BorderLayout.CENTER);
Sorry for the mistake
This works.
import java.awt.*;
import javax.swing.*;
public class MyFrame extends JFrame
{
private JPanel westPanel;
private JPanel mainPanel;
private JTextField f;
public MyFrame()
{
westPanel = new JPanel();
westPanel.setPreferredSize(new Dimension(100, 50));
mainPanel = new JPanel();
f = new JTextField();
mainPanel.setLayout(new BorderLayout());
mainPanel.add(westPanel, BorderLayout.WEST);
mainPanel.add(f, BorderLayout.CENTER);
getContentPane().add(mainPanel, BorderLayout.CENTER);
setSize(120, 70);
setVisible(true);
}
public static void main(String[] arg)
{
MyFrame frame = new MyFrame();
}
}
Thanks chuanhaochiu,It turned out to be my JVM in the end. I tried my piece of code on a different machine and it worked fine. After reinstalling the JVM on the original machine it now also works properly.Thanks for your time though,Grant
