JInternalFrames, fault in code

[colin shuker]

Hi again,

I recently posted a question about getting a JInternalFrame so you can
see through it, but it doesn't seem to work when I apply to a card layout.

My code is something like this:

JPanel cards=new JPanel();
cards.setLayout(new CardLayout());
// add JPanels to cards
 

JInternalFrame internalFrame = 
    new JInternalFrame("Frame", true, true, true, true );
internalFrame.setOpaque(false);
internalFrame.getContentPane().setLayout(null);
JButton button=new JButton("Press Me!");
button.setSize(100,20);
button.setLocation(20,20);
internalFrame.getContentPane().setBackground(new Color(255,50,50,50));
internalFrame.getContentPane().add(button);
internalFrame.setPreferredSize(new Dimension(200,200));
internalFrame.pack();
internalFrame.setVisible( true );
 

 
JDesktopPane jdtp=new JDesktopPane();
jdtp.setPreferredSize(new Dimension(550,550));
jdtp.add(cards);
jdtp.add(internalFrame);
jdtp.setVisible(true);

Then I add the 'jdtp' to the JFrames ContentPane.
The JInternalFrame displays properly, but the JPanels I added to 'cards'
won't display, and the screen is blue.

I don't see why it doesn't work, can anyone help.

[colin shuker]

Seems only JInternalFrames can be added to JDesktopPanes which explains why only the JIntenalFrame shows.

I guess I'll have to create a JPanel 'cards' with CardLayout,
which I can add 2 objects that extend JDesktopPane.

Thats probably best.

[colin shuker]

Hmm, I can't get this to work, can anyone help.

Basically I need a JPanel(CardLayout) with a JInternalFrame lying on top,

OR

A JPanel(CardLayout) where two JDesktopPanes(each having their own JInternalFrame) are added.

I tried both approaches, but I can't get it to work, is there any way to do this?

Thanks

[Michael Dunn]

works OK like this

    
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Testing
{
  CardLayout cl = new CardLayout();
  public void buildGUI()
  {
    final JFrame f = new JFrame();
    f.getContentPane().setLayout(cl);
    f.getContentPane().add("blue",getDesktop(Color.BLUE));
    f.getContentPane().add("yellow",getDesktop(Color.YELLOW));
    f.setSize(400,300);
    f.setLocationRelativeTo(null);
    f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    JMenuBar menuBar = new JMenuBar();
    JMenuItem menuItem = new JMenuItem("Next");
    menuBar.add(menuItem);
    f.setJMenuBar(menuBar);
    f.setVisible(true);
    menuItem.addActionListener(new ActionListener(){
       public void actionPerformed(ActionEvent ae){
         cl.next(f.getContentPane());
       }
     });
  }
  public JDesktopPane getDesktop(Color color)
  {
    JDesktopPane desktop = new JDesktopPane();
    desktop.setBackground(color);
    JInternalFrame internalFrame = new JInternalFrame("Frame", true, true, true, true );
    internalFrame.setPreferredSize(new Dimension(100,100));
    internalFrame.pack();
    internalFrame.setVisible( true );
    desktop.add(internalFrame);
    return desktop;
  }
  public static void main(String[] args)
  {
    SwingUtilities.invokeLater(new Runnable(){
      public void run(){
        new Testing().buildGUI();
      }
    });
  }
}

[colin shuker]

Thats great thanks!

I fiddled with it, and put an image in there too.
I realise why I was couldn't get the colour to work right
inside the JInternalFrames,
I assumed new Colour(a,b,c,d) had the alpha component first,
but alpha is last, which explains my odd results.

Thanks again.