Uploaded image for project: 'JDK'
  1. JDK
  2. JDK-1236541

fp.bugs 3168 add() shows object at 0,0 briefly before correct placement

    XMLWordPrintable

    Details

    • Subcomponent:
    • Resolved In Build:
      1.1
    • CPU:
      sparc
    • OS:
      solaris_2.5
    • Verification:
      Not verified

      Description


      >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;
          }
      }

        Attachments

          Activity

            People

            Assignee:
            amfowler Anne Fowler (Inactive)
            Reporter:
            bhagen Benjamin Hagen (Inactive)
            Votes:
            0 Vote for this issue
            Watchers:
            0 Start watching this issue

              Dates

              Created:
              Updated:
              Resolved:
              Imported:
              Indexed: