ingrid.yao@Eng 1997-11-25

This appears to be a regression introduced in the fix for bug#4089468.
another suggested fix from Oracle by adding "else { focus = c; }" at the
bottom of java.awt.Container$LightweightDispatcher.setFocusRequest().
This proposed one-liner just gets rid of the symptoms and may not be
the right solution.

---------------- Bug report-------------------------------
Platform: Windows NT
Command Line: java b590689
 
Directions and Expected Results:
 
- Run this program.
- Click on the button to initially set focus on it.
- Start pressing [Tab] & [Shift+Tab] and
  observe the behavior and output.
- When using [Tab] to go forward, it takes 3 jumps to
  cycle through the two components.
- When using [Shift+Tab] to go backward, it takes the correct 2 jumps,
  but the lightweight component never receives a focusGained event.
 
Notes:
 
In the simple test case, the Tab key does not correctly move focus back and
forth between a lightweight component and a java.awt.Button, both of which
are children of a java.awt.Panel inside a java.awt.Frame.

/*
Oracle Bug: 590689
 
Directions and Expected Results:
 
- Run this program.
- Click on the button to initially set focus on it.
- Start pressing [Tab] & [Shift+Tab] and
  observe the behavior and output.
- When using [Tab] to go forward, it takes 3 jumps to
  cycle through the two components.
- When using [Shift+Tab] to go backward, it takes the correct 2 jumps,
  but the lightweight component never receives a focusGained event.
*/
 
public class b590689
{
    public static void main( String[] args )
    {
        java.awt.Container panel = new java.awt.Panel();
        panel.setLayout( new java.awt.BorderLayout());
 
        panel.add( "West", new LightweightButton());
        panel.add( "East", new java.awt.Button( "Focusable button" ));
 
        java.awt.Window frame = new java.awt.Frame( "Fix me!" );
        frame.add( "Center", panel );
        frame.pack();
        frame.setVisible( true );
    }
 
    static class LightweightButton extends java.awt.Component
        implements java.awt.event.FocusListener
    {
        LightweightButton() { addFocusListener( this ); }
        public void focusGained( java.awt.event.FocusEvent e )
        {
            System.out.println( "FocusComponent.focusGained( " + e );
        }
        public java.awt.Dimension getPreferredSize()
        {
return new java.awt.Dimension( 100, 100 );
}
        public void focusLost( java.awt.event.FocusEvent e ) {}
        public boolean isFocusTraversable() { return true; }
    }
}