Canvas Only Shows on Resize

Hey,

I'm creating a simple program using a JFrame with a canvas (LogoCanvas()) that is used to display a logo created in another class. I'm trying to display the canvas (logo) in the 'EAST' side of a JPanel with a BorderLayout layout.

My issue is that the logo only displays itself when I resize the running JFrame window. When I simply run the program the logo is invisible.

Code:

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import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.FlowLayout;
import java.awt.Font;
import javax.swing.*;

public class MyGUI extends JFrame
{
    private JButton cdListBtn = new JButton("View CD List");
    private JButton mp3ListBtn = new JButton("View MP3 List");
    private JButton cartBtn = new JButton("View Cart");
    private JLabel titleLbl = new JLabel("Liam's GUI");
    private JPanel northPnl, southPnl;
    private LogoCanvas canvas;
   
    Font font = new Font("Tahoma", Font.BOLD, 12);
   
    public MyGUI()
    {
        super("Follow a GUI Plan");
       
        //Creates new canvas containing logo
        canvas = new LogoCanvas();
       
        //Sets fonts for three buttons and label
        cdListBtn.setFont(font);
        mp3ListBtn.setFont(font);
        cartBtn.setFont(font);
        titleLbl.setFont(new Font("Tahoma", Font.PLAIN, 20));
       
        //Centers label so it appears in center of JPanel
        titleLbl.setHorizontalAlignment(SwingConstants.CENTER);
       
        //Creates north panel and adds title label and logo
        northPnl = new JPanel();
        northPnl.setOpaque(false);
        northPnl.setLayout(new BorderLayout());
        northPnl.add(titleLbl, BorderLayout.CENTER);
        northPnl.add(canvas, BorderLayout.EAST);
       
        //Creates south panel and adds three buttons (flow layout)
        southPnl = new JPanel();
        southPnl.setOpaque(false);
        southPnl.setLayout(new FlowLayout());
        southPnl.add(cdListBtn);
        southPnl.add(mp3ListBtn);
        southPnl.add(cartBtn);
       
        //Adds north and south panels to frame
        getContentPane().add("North", northPnl);
        getContentPane().add("South", southPnl);
       
        setSize(400, 300);
        setLocation(300, 300);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        getContentPane().setBackground(new Color(0xCC, 0xE6, 0xFF));
        setVisible(true);
    }
   
    public static void main(String[] args)
    {
        new MyGUI();
    }
}

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Any advice would be greatly appreciated. Thanks.

Try calling pack on the JFrame prior to calling setVisible

Quote:

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Originally Posted by doWhile

Try calling pack on the JFrame prior to calling setVisible

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Adding pack(); to the MyGUI method didn't work. Adding it to the line before setVisible compressed the window size and adding it anywhere else had no effect.

Sorry for my ignorance, I'm a student and I've never had to call "pack" before.

Why do you setOpaque(false)? What are you trying to achieve by that?

db

Moved from New to Java

db

Quote:

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Originally Posted by DarrylBurke

Why do you setOpaque(false)? What are you trying to achieve by that?

db

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To remove the background from the north and south JPanels. I wouldn't normally, but it states to do so in the assignment brief I've been given.