>From: Garth Allen Dickie <###@###.###>
This does not look like form output to me.


Hi, I am using JDK beta 2 and Netscape 2.0 beta 5 running
on a Solaris 2.4 machine. Running my Java applet under both
appletviewer and Netscape, I find the following cosmetic bug:

If a container is already visible and I add a new component,
then the new component is drawn twice. The new component
appears first in a default positition (its layout method
has not been called?), and then again in the correct position.
You can observe the problem at the URL

http://www.win.tue.nl/win/math/dw/personalpages/dickie/layouttest.html

The source code for the demo applet is as follows:

import java.applet.Applet;
import java.awt.*;

public class LayoutTestApplet extends Applet {
    final static int count = 8;
    final static int height[ ] = { 4, 3, 7, 5, 4, 12, 4, 2 };
    MyCheckbox checkbox[ ];
    TextArea block[ ];
    int indices[ ];

    public void init( ) {
        checkbox = new MyCheckbox[ count ];
        block = new TextArea[ count ];

        for( int i = 0; i < count; ++ i ) {
            String label = Integer.toString( i );
            block[ i ] = new TextArea( label, height[ i ], 60 );
            checkbox[ i ] = new MyCheckbox( label, this, i );
        }

        Panel checkPanel = new Panel( );
        for( int i = 0; i < count; ++ i )
            checkPanel.add( checkbox[ i ] );

        add( checkPanel );
        for( int i = 0; i < count; ++ i )
            add( block[ i ] );

        indices = new int[ count ];
        for( int i = 0; i < count; ++ i )
            indices[ i ] = i + 1;
    }

    void showHideBlock( int index, boolean show ) {
        if( show ) {
            add( block[ index ], indices[ index ] );
            layout( );
            for( int i = index + 1; i < count; ++ i )
                indices[ i ] ++;
        } else {
            remove( block[ index ] );
            layout( );
            for( int i = index + 1; i < count; ++ i )
                indices[ i ] --;
        }
    }
}

class MyCheckbox extends Checkbox {
    LayoutTestApplet container;
    int index;

    public MyCheckbox( String label, LayoutTestApplet container, int
index ) {
        super( label, null, true );

        this.container = container;
        this.index = index;
    }
 
    public boolean action( Event event, Object argument ) {
        container.showHideBlock( index, super.getState( ));
        return true;
    }
}