Re: Colormap and drawing_area widget

[Mathieu Lacage <mathieu_lacage myrealbox com>]

On Tue, 2003-11-18 at 11:14, Luc Maurette sanofi-synthelabo com wrote:
> Hi everybody,
> I have a little pb with gtk_drawing_area. I read tutorial and API
> documentation but i don't find the answer : why i obtain this error message
> when using the code below ?

because the window field of the GtkWidget is valid only when the widget
is "realized". You need to connect a signal handled to the "realized"
signal and get the colormap from within this signal handler.

Mathieu

> 
> *************Code*********************
> GtkWidget *ZoneDessin;
> GdkColormap *colormap;
> 
> ZoneDessin = gtk_drawing_area_new();
> colormap = gdk_window_get_colormap(ZoneDessin->window);
> 
> *************Error***********************
> Gdk-CRITICAL **: file gdkdraw.c: line 244 (gdk_drawable_get_colormap):
> assertion `GDK_IS_COLORMAP (colormap)' failed
> 
> Thanks, Luc.
> 
> 
> 
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-- 
Mathieu Lacage <mathieu gnu org>