XWindows - how capture window ?

[Valery Reznic]

--- On Sat, 3/13/10, guy keren <choo at actcom.co.il> wrote:

> From: guy keren <choo at actcom.co.il>
> Subject: Re: XWindows - how capture window ?
> To: "Valery Reznic" <valery_reznic at yahoo.com>
> Cc: "linux-il." <linux-il at cs.huji.ac.il>
> Date: Saturday, March 13, 2010, 8:16 PM
> Valery Reznic wrote:
> > 
> > --- On Sat, 3/13/10, guy keren <choo at actcom.co.il>
> wrote:
> > 
> >> From: guy keren <choo at actcom.co.il>
> >> Subject: Re: XWindows - how capture window ?
> >> To: "Valery Reznic" <valery_reznic at yahoo.com>
> >> Date: Saturday, March 13, 2010, 3:56 PM
> >> 
> >> the reason is: background jobs.
> >> 
> >> the application does not necessarily do everything
> in one
> >> shot. some of its widgets leave some processing to
> be done
> >> during "idle" periods - which, i imagine, are
> triggered by
> >> timers. for this, they need the main loop to be
> executed for
> >> some (non-zero) duration.
> > At least application itself do nothing with timers.
> > And widgets are the standard ones - labels, buttons,
> text and draw areas.
> > 
> > So I don't sure what's background jobs is.
> 
> in my program, i used the gtk+ toolkit, and specifically
> the TextView widget.
> 
> in this widget, when you populate it with a large amount of
> text, it calculates the size of lines in the background (as
> an idle task), in order to be able to draw the window
> withthe first lines of text as soon as possible. i needed to
> be able to show the text and immediately jump to some line -
> this failed because the widget didn't yet know exactly where
> to draw each line.
I use only Xt/Motif widgets (yes this application is ancient)
but may be then do something like that too.

Thank yo for the info.
Valery.

> 
> there was no method for the widget to tell me it finished
> calculating its background tasks, so i had to use this kind
> of sleep-and-wait as a work-around.
> 
> --guy
>