> here's the scheme:
> step 1: create a drawing_area widget, initialize the
> data that will have to be drawn unto it,
> connect a couple of signals,
> associate that data with the object
> (gtk_object_set_data).
> step 2: show the widget
> this will first call whatever has been associated
> to the configure_event (drawing all the background
> stuff unto an offscreen pixmap, a pixmap which is
> also associated with the widget in it's user data),
> and afterwards it ought to call whatever has been
> connected to the expose_event (which simply draws
> the pixmap created into the configure_event unto
> the screen).
> bummer: this scheme works up unto the configure_event handler,
> the expose_event handler is never called.
> Prior to it's call, the following error is
> generated:
I tried something now, and when instead of drawing a pixmap
I simply draw a rectangle on my offscreen pixmap, then the
code does not break.
here some code snippets:
/* loading of the background image */
background = gdk_pixmap_colormap_create_from_xpm(NULL,
map, &dummymask, NULL, BACKGROUNDIMG);
/* from configure_event handler */
/* creating an offscreen pixmap */
pixmap = gdk_pixmap_new( widget->window, widget->allocation.width,
widget->allocation.height, -1);
/* so working with a simple rectangle works
gdk_draw_rectangle( pixmap, gc, TRUE, 0, 0,
widget->allocation.width,
widget->allocation.height);
*/
/* but if one draws a pixmap on top of the other pixmap, boom,
* one gets an error message
*/
gdk_draw_pixmap( pixmap, gc,
background,
0, 0, 0, 0, widget->allocation.width,
widget->allocation.height);
/* from the expose_event handler */
gdk_draw_pixmap( widget->window,
widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
pixmap,
ev->area.x, ev->area.y,
ev->area.x, ev->area.y,
ev->area.width, ev->area.height);
error-message:
Gdk-ERROR **: BadDrawable (invalid Pixmap or Window parameter)
serial 754 error_code 9 request_code 62 minor_code 0
so if someone has a clue,
in the meantime, I'll try to solve it in another way perhaps...
Nancy Mazur
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