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<H1>[Gtk-sharp-list] Force UI Update?</H1>
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<B>Jim Orcheson</B>
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<A HREF="mailto:gtk-sharp-list%40lists.ximian.com?Subject=%5BGtk-sharp-list%5D%20Force%20UI%20Update%3F&In-Reply-To=BANLkTinPaHqNMJdeNT1myZ5_3X9qj44%3D1g%40mail.gmail.com"
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TITLE="[Gtk-sharp-list] Force UI Update?">jim at va3hj.ca
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</A><BR>
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<I>Tue May 3 07:27:24 EDT 2011</I>
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<!--beginarticle-->
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<PRE>Thanks, that works.
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I have avoided a separate thread because the processing in
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DoLongProcessing() would only take a long time for a very few users, and
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they would want that processing to complete before interacting with the
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program in another way. Therefore I am not too concerned that the code
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is blocking.
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If it does end up bothering people, I can always redo the code as a
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separate thread.
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Jim
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On 02/05/11 10:03 AM, Michael Hutchinson wrote:
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><i> On Sun, May 1, 2011 at 4:29 PM, Jim Orcheson<<A HREF="http://lists.ximian.com/mailman/listinfo/gtk-sharp-list">jim at va3hj.ca</A>> wrote:
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</I>>><i> I have a Gtk# application where the processing of a menu item may take
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</I>>><i> many seconds. I want to change the cursor to a Watch before the actual
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</I>>><i> processing takes place, and then change the cursor back to Arrow when
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</I>>><i> done. For example:
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</I>>><i>
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</I>>><i> OnMenuItem(...)
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</I>>><i> {
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</I>>><i> DoSetupProcessing();
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</I>>><i> this.GdkWindow.Cursor = new Gdk.Cursor(Gdk.CursorType.Watch);
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</I>>><i> DoLongProcessing();
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</I>>><i> this.GdkWindow.Cursor = new Gdk.Cursor(Gdk.CursorType.Arrow);
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</I>>><i> }
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</I>>><i>
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</I>>><i> With this code the watch cursor is never displayed because UI updating
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</I>>><i> normally only occurs during idle processing, which of course does not
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</I>>><i> occur until after OnMenuItem returns.
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</I>>><i>
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</I>>><i> Is there a way to force the update to display the watch cursor without
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</I>>><i> DoLongProcessing using a separate thread?
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</I>><i> You could manually flush the UI event queue with
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</I>><i> while (Gtk.Application.EventsPending ())
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</I>><i> Gtk.Application.RunIteration ();
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</I>><i> but your processing code will still be blocking the UI thread while
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</I>><i> you're doing your processing, so if anything gets invalidated by an
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</I>><i> external source it won't redraw.
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</I>><i>
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</I>><i> For a good user experience, you should really do the processing in a
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</I>><i> thread, and probably show a modal dialog with a progress bar and a
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</I>><i> cancel button. Your processing thread can update the progress bar
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</I>><i> using Gtk.Application.Invoke to touch the UI thread.
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</I>><i>
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</I>><i> <A HREF="http://www.mono-project.com/Responsive_Applications">http://www.mono-project.com/Responsive_Applications</A>
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</I>><i>
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</I></PRE>
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