JLayeredPane not working. Complete code example (one .java page).

Java 2D
#1

i searched and searched and couldn’t find the answer to this. the JLayeredPane seems to not behave as it is documented. before i dug deeper i wanted to know if i am doing something wrong.



import java.awt.*;
import javax.swing.*;

public class JLayeredPaneTest {
    JFrame frame;
    JPanel container = new JPanel();
    JPanel test = new JPanel();
    JLayeredPane pane = new JLayeredPane();
    
    /** Creates a new instance of RulerPanelTest */
    public JLayeredPaneTest() {
	setupFrame();
    }
    public static void main(String[] args) {
	new JLayeredPaneTest();
    }
    private void setupFrame() {
	frame = new JFrame( getClass().getName() );
	frame.setBackground( new Color(255, 204, 204 ) );
	frame.setSize( 640, 480 );
	frame.setLayout( new BoxLayout( frame, BoxLayout.X_AXIS ));
	frame.setContentPane( container );
	container.setBorder( BorderFactory.createTitledBorder( "container" ));
	container.add( test );
	test.setBackground( Color.white );
	test.setPreferredSize( new Dimension( 400, 250 ));
	test.setBorder( BorderFactory.createTitledBorder( " test "));
	test.add(pane );
	pane.setBorder( BorderFactory.createTitledBorder("pane"));
	
	pane.setBounds(0, 0, 300, 300 );
	JLabel l = new JLabel("label");
	l.setOpaque( true );
	l.setBounds( 50, 50, 200, 200 );
	pane.add( l );
	System.out.println( pane.getSize() );
	System.out.println(pane.getComponentCount() );
	
	frame.setVisible( true );
    }
}

it’s weird, because when i getSize() on the pane, it gives me a dimension.

the whole reason i’ve spent a long frustrating weekend trying to make this work is i need to create a timeruler out of JComponents: is maybe there another way to do this
without the layered pane (i’m using a layered pane for the time ruler numbers)?

#2

You haven’t said what your problem is.

#3

i guess that would help! lol.

after inserting the components, they don’t show up.

#4

after much experimenting, i decided to abandon JLayeredPanes altogether. they just don’t seem to behave correctly. i was able to make other layout management work as well.