Re: [platform-swt-dev] in a sub thread, how to call a widget of its fath

[Dan Kehn <kehn@xxxxxxxxxx>]

The example cited in the online documentation
should add a test:

   // do time-intensive
computations
   ...
   // now update the UI. We don't depend on the result,
   // so use async.
   display.asyncExec (new Runnable () {
      public void run () {
       
if (myWindow.isDisposed())  // check if still around
       
  return;
         myWindow.redraw ();
      }
   });
   // now do more computations


In some products, I've noticed .log
files littered with exceptions because the asyncExec is processed after
the window has already closed.  It wouldn't be a bad idea to integrate
this check into the SWT API, e.g.:

    myWindow.asyncUpdate(new
Runnable...);

This in turn would check if the widget
still exists before executing the runnable.

-- Dan



----- Message from "Hélène
ORTIZ" <hchagnot@xxxxxxxxxxxxxxx> on Thu, 21 Oct 2004 10:37:02
+0200 (CEST) -----

To:	<platform-swt-dev@xxxxxxxxxxx>
Subject:	Re: [platform-swt-dev] in a sub thread, how to call a widget of its father

Tina,

For a code sample, have a look here :

http://help.eclipse.org/help30/index.jsp?topic=/org.eclipse.platform.doc.isv/guide/swt_threading.htm

> Hi
>   So, may I use event and listener to inform the UI Thread to
modify
> its widget such as Label.
>   If it can, could you please provide a slip of code !
> Regard
> -Tina
>