Name: rmT116609 Date: 09/09/2004


A DESCRIPTION OF THE REQUEST :
All other containers seem to process the change in size of a parent automatically. However, JLayeredPane does not:

1) No child addded to a JLayeredPane appears unless it has had its bounds explicitly set by a call to setBounds().

2) Once the parent has been resized, the children retain their original bounds. (ie. no event triggered layout adjustment is done....)

JUSTIFICATION :
While it can be tested for and caught, the necessary code required to calculate and maintain all child component's aspects within a JLayeredPane is fairly large and time consuming.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Add a component as CENTER to a BorderLayout and it will consume as much available space as possible without explicitly setting the component's bounds.

Resizing a JFrame , JWindow or JPanel applies the current LayoutManager's behaviour and rules to the contained components ie..they are automatically resized.
ACTUAL -
Add a component to a JLayeredPane without a specifically setting the component's bounds will prevent the JLayeredPane from displaying the component.

Resizing a JLayered pane has no affect on the contained components. Almost as if the child components are unaware of the change....

---------- BEGIN SOURCE ----------
public static void main(String[] args)
{
javax.swing.JFrame tFrame = new javax.swing.JFrame("LAYER TEST");
        tFrame.setDefaultCloseOperation(tFrame.EXIT_ON_CLOSE);
        
        javax.swing.JLayeredPane layerPane = new javax.swing.JLayeredPane();
        
        tFrame.getContentPane().add(layerPane, java.awt.BorderLayout.CENTER);
        //JPanel - no bounds set...
        javax.swing.JPanel jp = new javax.swing.JPanel(new java.awt.BorderLayout(5, 5));
        jp.add(new javax.swing.JButton("Some Button"), java.awt.BorderLayout.CENTER);
        layerPane.add(jp, layerPane.DEFAULT_LAYER, -1);
        tFrame.setSize(java.awt.Toolkit.getDefaultToolkit().getScreenSize());
        tFrame.setVisible(true);
}

ABOVE displays no button.

Add line:
jp.setBounds(0, 0, 640, 480);

and the panel/button is rendered.... changeing the size of the window arround will not resize these components.
---------- END SOURCE ----------


(Incident Review ID: 301354)
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