Re: "draw" event fired forever

["Jasper St. Pierre" <jstpierre mecheye net>]

gdk_window_set_background_rgba will queue a redraw on its own. Either set the background once when you create the GdkWindow, or paint the background manually with cairo.

On Mon, Nov 4, 2013 at 10:15 AM, onetmt <onetmt gmail com> wrote:

Il 04/11/2013 15:24, Jasper St. Pierre ha scritto:

> Hm. This shouldn't be happening. What version of GTK+3 are you using,
> and can you produce a small reproducible example[0] ?
>
> [0] http://sscce.org/
>

Please, find the attached example. I can get what I think is the right
behaviour by commenting the call to the drawing function in
on_daCairo_draw() callback, but when I have any cairo_ action, the
result is an infinite firing.

Release I'm currently using is 3.8.4 (Debian testing current version).

>
> On Mon, Nov 4, 2013 at 9:18 AM, onetmt <onetmt gmail com

> <mailto:onetmt gmail com>> wrote:
>
>     Il 04/11/2013 15:06, Jasper St. Pierre ha scritto:
>     > Connect to the "draw" signal on the widget to do your drawing, and
>     call
>     > gtk_widget_queue_redraw(); on the widget if you want to request a
>     redraw.
>     >
>     This is what I'm currently doing (I've connected to "draw" signal of a
>     GtkDrawingArea), but the problem is that I have the "draw" event fired
>     continuosly.
>
>
>     >
>     > On Mon, Nov 4, 2013 at 9:02 AM, onetmt <onetmt gmail com
>     <mailto:onetmt gmail com>

>     > <mailto:onetmt gmail com <mailto:onetmt gmail com>>> wrote:
>     >
>     >     I'm currently in the process of porting to gtk+-3 an old finite
>     >     difference calculation application; this application had a
>     custom graph
>     >     drawing routine based on gdk_ subsystem that cannot be
>     compiled anymore
>     >     against new gtk3 api :( . I succesfully converted every gdk_
>     invocation
>     >     in their cairo_ counterparts, but now I have to substitute the
>     no longer
>     >     available "expose-event" with the new "draw" event. The
>     problem is that
>     >     it runs continuosly in an infinite loop.
>     >
>     >     What is the expected mechanism of this new event? How can I
>     refresh the
>     >     graph in a clean way as in old expose-event?
>     >
>     >     TIA
>     >
>     >     --
>     >     Hofstadter's Law:
>     >     "It always takes longer than you expect, even when you take
>     into account
>     >     Hofstadter's Law."
>     >     _______________________________________________
>     >     gtk-list mailing list
>     >     gtk-list gnome org <mailto:gtk-list gnome org>

>     <mailto:gtk-list gnome org <mailto:gtk-list gnome org>>

>     >     https://mail.gnome.org/mailman/listinfo/gtk-list
>     >
>     >
>     >
>     >
>     > --
>     >   Jasper
>
>
>     --
>     Hofstadter's Law:
>     "It always takes longer than you expect, even when you take into account
>     Hofstadter's Law."
>     _______________________________________________
>     gtk-list mailing list
>     gtk-list gnome org <mailto:gtk-list gnome org>
>     https://mail.gnome.org/mailman/listinfo/gtk-list
>
>
>
>
> --
>   Jasper


--
Hofstadter's Law:
"It always takes longer than you expect, even when you take into account
Hofstadter's Law."

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--
  Jasper