Re: [JPanel child of JPanel]how to get a rectangle object with the dimensions of the JPanel object

From:

Daniel Moyne <daniel.moyne@neuf.fr>

Newsgroups:

comp.lang.java.help

Date:

Fri, 07 Aug 2009 11:22:38 +0200

Message-ID:

<4a7bf25e$0$1530$426a74cc@news.free.fr>

Knute Johnson wrote:

Daniel Moyne wrote:

I have built a childJPanel child of another mainJPanel and I cannot get
its dimensions ; I tried :
Rectangle ee=childJPanel.getBounds();
childJPanel.getX();
childJPanel.getHeight();

but all the time I get 0 !

For the time being the layout of my mainJPanel is Absolute where I have
positioned my childJPanel with xpos, ypos, height and width but I do not
think that here it has no direct impact as the methods listed above shoud
work for any layouts ?

Thanks.

Can you see this childJPanel? My best guess is that it's size is zero.

import java.awt.*;
import java.awt.event.*;

public class test8 extends Frame {
     public test8() {
         addWindowListener(new WindowAdapter() {
             public void windowClosing(WindowEvent we) {
                 dispose();
             }
         });

         Panel parent = new Panel(null);
         parent.setBackground(Color.BLUE);
         add(parent);

         Panel child = new Panel();
         child.setBackground(Color.YELLOW);
         child.setBounds(50,50,50,50);
         parent.add(child);

         setSize(320,240);
         setVisible(true);

         System.out.println(child.getBounds());
     }

     public static void main(String[] args) {
         new test8();
     }
}

C:\Documents and Settings\Knute Johnson>java test8
java.awt.Rectangle[x=50,y=50,width=50,height=50]

Thanks Knute for this that works fine ; of course as you setBounds(...) you
get your parameters with getBounds() ; in my case I do not use setBounds()
and this was be the problem ; this is what I did ; I defined my childPanel
with a netneans class with a JPanelform like this :
Form ChildPanel
|_Other Components
|_JPanel
    |_AbsoluteLayout
    |_jScrollPane
       |_jTree

at the end of my code I added this :
mainjPanel.add(jScrollPane, new
org.netbeans.lib.awtextra.AbsoluteConstraints(myXPosition, myYPosition,
JTREE_WIDTH, JTREE_HEIGHT));
with position and size parameters passed though my constructor.

I was wrongly expecting getBounds() applied to childPane to supply the
rectangle with (myXPosition, myYPosition, JTREE_WIDTH, JTREE_HEIGHT) but as
childPanel instance of ChildPanel had nothing to do with mainjPanel it did
not work.

Now if I add this as your example shows :
jScrollPaneMarriage.setBounds(myXPosition, myYPosition, JTREE_WIDTH,
JTREE_HEIGHT);
it works if I claim myRectangle like this :
childPanel.jScrollPane.getBounds();
Thanks as I was lost here.

Knute I seize this opportunity to ask you to put in this thread what you
posted on wrote on scrollRectToVisible(java.awt.Rectangle) that I want to
use in my app.
Thanks again.