Help with GridBagLayout

Question

Okay, I'm trying this GridBagLayout thing, and I just can't wrap my head around it. Can someone please help me? I have a simple JFrame (code posted below), and it is set to the size of my screen, 1024x768. I have three JPanels I want placed a certain way. I want one JPanel across the bottom, but only a quarter of the height of the JFrame. Above this, I want one JPanel to fill the rest of the height, but only a quarter of the width. I then want the last JPanel to fill the remaining space. See below for crude drawing with dashes and code.
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|******|*********|
|******|*********|
|******|*********|
|******|*********|
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Okay, that was crude. Here's my code:
class MainFrame extends JFrame
    private JPanel checklist;
    private JPanel gameboard;
    private JPanel cards;
    public MainFrame()
        setTitle("Clue!");
        Toolkit kit = Toolkit.getDefaultToolkit();
        Dimension d = kit.getScreenSize();
        setBounds(0,0,d.width,d.height);
        final Container contentPane = getContentPane();
        GridBagLayout gbl = new GridBaglayout();
        GridBagConstraints gbc = new GridBagConstraints();
        contentPane.setLayout(gbl);
        checklist = new ChecklistPanel();
        gameboard = new GameBoardPanel();
        cards = new CardPanel();
        gbc.fill = GridBagConstraints.NONE;
        gbc.anchor = GridBagConstraints.EAST;
        gbc.weightx = 0;
        gbc.weighty = 0;
        add(checklist, gbc, 0, 0, 1, 1);
        add(gameboard, gbc, 0, 1, 1, 1);
        gbc.fill = GridBagConstraints.HORIZONTAL;
        gbc.anchor = GridBagConstraints.SOUTH;
        add(cards, gbc, 0, 1, 1, 2);
    public void add(Component c, GridBagConstraints constraints, int x, int y, int w, int h)
        constraints.gridx = x;
        constraints.gridy = y;
        constraints.gridwidth = w;
        constraints.gridheight = h;
        getContentPane().add(c, constraints);
}Now, checklist has a setPreferredSize(new Dimension(1024, 192));
gameboard has setPreferredSize(new Dimension(768, 576));
and cards has setPreferredSize(new Dimension(256, 576));
I took the screen size and divided it up into four, so I knew how big one quarter was, and could find out how big three quarters was, so the Panels are sized correctly, and it compiles without any errors, but when I run, nothing shows. I have set a simple line border on the panels as well. I'm developing with the latest version of the SDK, on an 800MHz G4 iMac.
I'm trying to understand this GridBagLayout, but I can't seem to get this right. If anyone can help, that would be great.
James

Answer 1

rpgmaker wrote:
"Oops", I feel like an idiot now.
Thanks.No problem. Sometimes all you need is another set of eyes to look at the code.