nanogui: Thread: updating window

Hi all,
I don't think this question was asked before but I'm wondering if there is anyway to update a window without causing a noticable flicker. Is there? If not, is there a way to update a portion of the window? 
For instance, if I want to add items to a displayed list, or icons for that matter, is their a way to update just the portion affected and not the entire window?

Much thanks.
Robbie

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On Wed, Mar 08, 2006 at 10:21:01AM -0500, Robbie wrote:
> I don't think this question was asked before but I'm wondering if
> there is anyway to update a window without causing a noticable
> flicker. Is there? If not, is there a way to update a portion of the
> window? 
>
> For instance, if I want to add items to a displayed list, or icons for
> that matter, is their a way to update just the portion affected and
> not the entire window?

double-buffer.  create an offscreen pixmap, do all your updates there,
and then perform a single blit to the visible window.

since you're not performing any erase/redraw operations to the visible
screen, the flicker is minimized.

-- 
  Aaron J. Grier  |   Frye Electronics, Tigard, OR   |  ####@####.####

If I do that, I'll have to set the background of the pixmap to a specified colour. I wasn't aware you can do that. can you?

Thanks. 

> -----Original Message-----
> From: Aaron J. Grier ####@####.####
> Sent: Wednesday, March 08, 2006 1:05 PM
> To: ####@####.####
> Subject: [nanogui] Re: updating window
> 
> On Wed, Mar 08, 2006 at 10:21:01AM -0500, Robbie wrote:
> > I don't think this question was asked before but I'm wondering if
> > there is anyway to update a window without causing a noticable
> > flicker. Is there? If not, is there a way to update a portion of the
> > window?
> >
> > For instance, if I want to add items to a displayed list, or icons for
> > that matter, is their a way to update just the portion affected and
> > not the entire window?
> 
> double-buffer.  create an offscreen pixmap, do all your updates there,
> and then perform a single blit to the visible window.
> 
> since you're not performing any erase/redraw operations to the visible
> screen, the flicker is minimized.
> 
> --
>   Aaron J. Grier  |   Frye Electronics, Tigard, OR   |  ####@####.####
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ####@####.####
> For additional commands, e-mail: ####@####.####



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GrFill dah!.
Sorry.


> -----Original Message-----
> From: Robbie ####@####.####
> Sent: Wednesday, March 08, 2006 3:05 PM
> To: ####@####.####
> Subject: RE: [nanogui] updating window
> Importance: High
> 
> 
> If I do that, I'll have to set the background of the pixmap to a specified
> colour. I wasn't aware you can do that. can you?
> 
> Thanks.
> 
> > -----Original Message-----
> > From: Aaron J. Grier ####@####.####
> > Sent: Wednesday, March 08, 2006 1:05 PM
> > To: ####@####.####
> > Subject: [nanogui] Re: updating window
> >
> > On Wed, Mar 08, 2006 at 10:21:01AM -0500, Robbie wrote:
> > > I don't think this question was asked before but I'm wondering if
> > > there is anyway to update a window without causing a noticable
> > > flicker. Is there? If not, is there a way to update a portion of the
> > > window?
> > >
> > > For instance, if I want to add items to a displayed list, or icons for
> > > that matter, is their a way to update just the portion affected and
> > > not the entire window?
> >
> > double-buffer.  create an offscreen pixmap, do all your updates there,
> > and then perform a single blit to the visible window.
> >
> > since you're not performing any erase/redraw operations to the visible
> > screen, the flicker is minimized.
> >
> > --
> >   Aaron J. Grier  |   Frye Electronics, Tigard, OR   |  ####@####.####
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: ####@####.####
> > For additional commands, e-mail: ####@####.####
> 
> 
> 
> _______________________________________________
> Join Excite! - http://www.excite.com
> The most personalized portal on the Web!
> 
> 
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: ####@####.####
> For additional commands, e-mail: ####@####.####

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