Re: "draw" event fired forever

[onetmt <onetmt gmail com>]

Il 04/11/2013 16:27, Jasper St. Pierre ha scritto:
> 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.

Thank you very much; it just worked.

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


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Hofstadter's Law."