Thread: Mutiple classfile, JPanel nothing shows up

Originally Posted by Norm

Not sure where the printout is coming from if you have gotten rid of the class?

in the addComponentsToPane method

Originally Posted by Norm

Is the program working now?

No but I got a button showing up

controls.add(startButton);
 
		startButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				panel.validate();
				panel.repaint();
				System.out.println("Layout bounds = " + getBounds());
			}
		});
		pane.add(controls,BorderLayout.SOUTH);

With that I got a button and every time I press it tells me the bounds
Layout bounds = java.awt.Rectangle[x=0,y=0,width=800,height=600]

But still no ball or pad

Originally Posted by Norm

Do you mean that the paintComponent() method of those two classes is not being called?

Right none of those two classes are being called

Originally Posted by Norm

Does the button's bounds take up the whole screen?

No the button is a nice size and it's at the bottom of the screen

Originally Posted by Norm

How are you using a layout manager to control where the components are positioned on the screen?

pane.add(controls,BorderLayout.SOUTH);

arkanoidGame.java

import java.awt.*;
import java.awt.event.*;
 
 
import javax.swing.*;
 
 
public class arkanoidGame extends JFrame {
	FlowLayout layout = new FlowLayout();
	JButton startButton = new JButton("Start Game");
 
 
	private static final long serialVersionUID = 1L;
 
 
	public arkanoidGame(String name) {	
		super(name);
 
	}
	public void addComponentsToPane(final Container pane) {
 
		final JPanel panel = new JPanel();	
		JPanel controls = new JPanel();
		controls.setLayout(new FlowLayout());
		panel.setLayout(layout);		
		panel.add(new ball());
		panel.add(new pad());		
		controls.add(startButton);
 
		startButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				panel.validate();
				panel.repaint();
				System.out.println("pad bounds = " + getBounds());
			}
		});
		pane.add(controls,BorderLayout.SOUTH);
		pane.add(new ball(),BorderLayout.NORTH);
		pane.add(new pad(),BorderLayout.CENTER);
	}
 
 
	private static void createAndShowGui() {
		arkanoidGame frame = new arkanoidGame("Arkanoid Game");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);					
		frame.pack();
		frame.setSize(800,600);
		frame.setBounds(0,0,800,600);	
		frame.addComponentsToPane(frame.getContentPane());	
		frame.setFocusable(true);
		frame.setFocusTraversalKeysEnabled(false);
		frame.setVisible(true);		
 
	}
 
	public static void main(String[] args) {
		try {
            //UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
            UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
        } catch (UnsupportedLookAndFeelException ex) {
            ex.printStackTrace();
        } catch (IllegalAccessException ex) {
            ex.printStackTrace();
        } catch (InstantiationException ex) {
            ex.printStackTrace();
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        }
		  UIManager.put("swing.boldMetal", Boolean.FALSE);
 
	        javax.swing.SwingUtilities.invokeLater(new Runnable(){
	            public void run() {
	                createAndShowGui();
 
	            }	
 
	        });
	}
}

Originally Posted by Norm

When I execute the code I get this:
pad paint bnds=java.awt.Rectangle[x=0,y=10,width=784,height=516]
Ball paint bnds=java.awt.Rectangle[x=0,y=0,width=784,height=10]

I get the same thing

Originally Posted by Norm

I'm confused. In post #29 you said: But still no ball or pad

If those messages are being printed then the ball and pad class's methods are being executed.

I added this since :

pane.add(new ball(),BorderLayout.NORTH);
pane.add(new pad(),BorderLayout.CENTER);

I think that's why we get some random bounds...

Originally Posted by Norm

The objects for the ball and pad classes are being added and their paintComponent methods are being called.

What is the problem now?

They are not showing up

Originally Posted by Norm

Do you have the call to drawLine() I mentioned in post#4 in the paintComponent() method to show where the component is located?

What do you expect to show up? How does the drawing x,y values compare to the bounds of the component? Are they outside or inside?

I added the drawLine() and the lines show up.

The problem is the bound of each they are not right... I tryed with the method setBounds but it doesn't seem to work

Originally Posted by Norm

How are you trying to control the bounds of the components?
The code uses two layout managers. They will position the components. You cant use the setBounds() method in the same container that there is a layout manager.

How can I do it then? Can I put them where ever I want them to be?

Originally Posted by Norm

Set the layout manager to null and use setBounds()

Can i have overlapping bounds?

Originally Posted by Norm

Set the layout manager to null and use setBounds()

I'm trying to use setBounds it doesn't work I tryed to use it that way :


pane.add(new ball().setBounds(60,60,60,60));

Originally Posted by Norm

What does "doesn't work" mean? Please explain in more detail.

It's an error :
The method add(Component) in the type Container is not applicable for the arguments (void)