Hi John!
John Cupitt schrieb:
> On 1/3/06, Christoph Bersch <[EMAIL PROTECTED]> wrote:
>> I want to write a program, that draws something in a DrawingArea, and calls a
>> function after _showing_ the changes in the DrawingArea:
>>
>> 1) call function draw_something()
>> 2) show the changes
>> 3) call a function measure()
>> 4) return to step 1)
>
> I would use a timeout. Set it to run every 20ms (or whatever interval
> you want), and do something like:
>
> static int number_of_ticks = 0;
>
> my_timeout_callback( ...
> {
> number_of_ticks += 1;
> if( number_of_ticks & 1 )
> // queue a redraw of our drawingarea
> gtk_widget_queue_draw( ..
> else
> measure();
>
> return( TRUE );
> }
Great, this seems to work :-)
> There's no guarantee that the draw will occur before the measure, but
> it probably will for most reasonable machines. But of course that's
> always true for X.
As long as it works for X, it's ok for me.
I thought, that a call of gtk_widget_draw() might be better than
gtk_widget_queue_draw_area(), as it draws immediately, although it is
deprecated.
So how could a call of gtk_widget_draw() be replaced in new code (I
don't fully understand the part belonging to this function in the
documentation). Could it be something like
gdk_window_invalidate_rect ();
gdk_window_process_updates ();
?
Thanks
Christoph
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