BorderLayout...

[Shah Chunky]

Hello all...
Can someone tell me how can v set the components
height using borderLayout when the component is placed
either in North or South.
i.e. i tried using setSize() but the componet height
was same.
According to BorderLayout, a components preferred height will be honored when attached to Norht or South.
Thanks

[ratul banji]

<quote>
According to BorderLayout, a components preferred height will be honored when attached to Norht or South.
</quote>
When components preferred height will be HONORED ..How can u change it !!
I think ..u can't.
Anybody >>>>>>>>>

[Shah Chunky]

What i wanted to know is that can u set the height of a component
if u place it in North or South...
Thanks
[This message has been edited by Shah Chunky (edited April 21, 2001).]

[Dave Terrian]

You were correct in saying that BorderLayout honors the preferred height for north and south positioned components.
Preferred size is determined by Component.getPreferredSize(). I believe by default an AWT component gets this information from its peer but of course you can override it and thereby set any dimension you want. With Swing components, you can change the preferred size by simply using JComponent.setPreferredSize().
Here's a snippet of the source code to BorderLayout's layoutContainer method:

if ((c=getChild(NORTH,ltr)) != null) {
  c.setSize(right - left, c.height);
  Dimension d = c.getPreferredSize();
  c.setBounds(left, top, right - left, d.height);
  top += d.height + vgap;
}

So you can see that it really does use the preferred size for north and south positions. Also, here's some code that demonstrates setting the size of a northern positioned AWT button:

import java.awt.*;
import java.awt.event.*;
public class Test extends Frame {
  public static void main(String args[]) {
    Test test=new Test();
    test.go();
  }
  public void go() {
    addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        setVisible(false);
        dispose();
        System.exit(0);
      }
    });
    setSize(new Dimension(300,300));
    setLayout(new BorderLayout());
    Button b=new Button("Test") {
      public Dimension getPreferredSize() {
        return(new Dimension(300,200));
      } 
    };
    add(b,BorderLayout.NORTH);
    setVisible(true);
  }
}

(My first time answering someone's question on here! Let's hope I'm right... )
- Dave

[This message has been edited by Dave Terrian (edited April 21, 2001).]