Re: GdkPixmap and configure_event

[Olexiy Avramchenko <ath beast stu cn ua>]

Reham Younis wrote:

> Hi,
> I am working on a project in which we are trying to
> upgrade its old GUI based on x lib pure calls to GTK
> (gtk-1.2).
> The problem is that I am creating a gtk drawing area
> which is used for drawing with x calls drawing
> functions. Things are working fine,except for
> GdkPixmap. It seems that for some reasons, using
> configure event with gdkpixmap doesnt work! The expose
> event works perfect,but when it tries to configure
> only a black area appears after the configure event is
> fired. Here is the code:
>
> gint expose_event (GtkWidget *widget, GdkEventExpose
> *event, gpointer data)
> {
> //HWindow is a struct that has a GdkPixmap as a
> member.
> HWindow *win = (HWindow*) data;
>
> //widget is the drawing area
>
> gdk_draw_pixmap (widget->window,
> widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
> win->pixmap,
> event->area.x,event->area.y,
> event->area.x,event->area.y,
> event->area.width,event->area.height);
>
> return FALSE;
> }
>
> gint config_event (GtkWidget *widget,GdkEventConfigure
> *event, gpointer data)
> {
> HWindow *win= (Hwindow*)data;
> if (win->pixmap)
> 	gdk_pixmap_unref(win->pixmap);
>
> win->pixmap = gdk_pixmap_new(widget->window,
> 	widget->allocation.width,
> 	widget->allocation.height,
> 	-1);
> gdk_draw_rectangle (win->pixmap,
> widget->style->fg_gc[GTK_WIDGET_STATE (widget)],
> TRUE,
> widget->allocation.x,widget->allocation.y,
*BUG* here: pass 0,0 as x,y

> widget->allocation.width,widget->allocation.height);
>
> }

1. Are you sure your gc *widget->style->fg_gc[GTK_WIDGET_STATE 
(widget)]* contains the color
you need ? Create and use your own gc. This's not the problem, but...
2.  This one looks like your problem.
You need to pass 0,0 as *x*, *y* coords to gdk_draw_rectangle, cause you 
may got
allocation.x > allocation.width (the width of your pixmap), allocation.y 
> allocation.height (the
height of your pixmap).

Olexiy