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Implementing absolute positioning for JPanels in java/netbeans JPanels applied through CardLayout!

Posted on 2011-10-13
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Last Modified: 2012-08-14
I have a few JPanels stacked under a mainPanel via CardLayout under Netbeans 7.  Now for some weird reason I can't get any of these JPanels to maintain a setPreferredSize of [600,400] and most annoyingly I can't get the associated components to be placed right on where they're supposed to be positioned on their associated JPanel.  Please note that I'm using Netbeans 7 properties menu to set these parameters. I even have set up the minimum and maximum size parameters.
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Question by:snajalm
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by:CEHJ
ID: 36963226
You need to set a layout on the main panel that allows absolute positioning. As you probably know, the default is GroupLayout with the gui designer. It sounds like you attempted to do that, but perhaps have not done ...
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by:snajalm
ID: 36963304
Done what??!

I already have the CardLayout in place with allows me to browse through my panels via "next" and "previous" buttons.  How can I have both these layouts be implemented so that I can get my "CardLayout" to impose absolute positioning on all it's underlying JPanels?!  
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Expert Comment

by:CEHJ
ID: 36964110
CardLayout is a special thing and doesn't affect in any way the layout of the components on any one 'card' you happen to be looking at. You need to set the correct layout on the main Container on the card
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Accepted Solution

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CEHJ earned 1500 total points
ID: 36964546
Here's an example of a CardLayout with absolute positioning
import java.awt.*;
import java.awt.event.*;

import java.io.*;

import java.util.*;

import javax.swing.*;


public class FB extends JFrame implements ActionListener {
    private JButton b;
    private JPanel cards;
    private String[] CARD_NAMES = { "One", "Two", "Three" };
    private int currentCardIndex = 0;

    public void actionPerformed(java.awt.event.ActionEvent e) {
	CardLayout cLayout = (CardLayout)cards.getLayout();
	System.out.printf("Will now show card %d (%s)\n", currentCardIndex, CARD_NAMES[currentCardIndex]);
        cLayout.show(cards, CARD_NAMES[currentCardIndex]);
	currentCardIndex++;
	currentCardIndex %= CARD_NAMES.length;
    }

    private void setGui() {
        try {
            setLocation(0, 100);
            setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

            Container cp = getContentPane();
	    cards = new JPanel();
	    cards.setLayout(new CardLayout());
	    addCards();
	    cp.add(cards, BorderLayout.CENTER);
            JPanel bPanel = new JPanel();
            b = new JButton("Next");
            b.addActionListener(this);
            bPanel.add(b);
            cp.add(bPanel, BorderLayout.SOUTH);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void addCards() {
        int x;
        int y;

        for (int i = 0; i < CARD_NAMES.length; i++) {
            x = y = (i * 30);

            String name = CARD_NAMES[i];
            JPanel p = new JPanel();
            p.setLayout(null);

            JLabel lab = new JLabel(String.format("Card %s", name));
            lab.setBounds(x, y, 100, 25);
            p.add(lab);
	    cards.add(p, name);
        }
    }

    public static void main(String[] args) {
        try {
            SwingUtilities.invokeAndWait(new Runnable() {
                    public void run() {
                        FB f = new FB();
                        f.setGui();
                        f.setSize(200, 200);
                        f.setVisible(true);
                    }
                });
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}

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Author Comment

by:snajalm
ID: 36966422
Thanks CEHJ!  I have implemented the CardLayout using Netbeans 7 which works fine, however, the mainPanel with the CardLayout layout does not maintain the preferredSize parametes.  I just don't understand why a JPanel's size can't be set to an unResizable state.  If there is a parameter that can set this up, please let me know since this thing is driving me crazy!  
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Author Closing Comment

by:snajalm
ID: 37691397
Thanks
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Expert Comment

by:CEHJ
ID: 37691414
:)
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