Obtaining coordinates of a widget

[Daniel Haude <dhaude physnet uni-hamburg de>]

Hello all,

I'd like to place a largish explanatory popup window next to a
button as soon as the mouse pointer moves over it (sort of like a
tool tip, only immediately and at a well-defined position). My
problem is to get the proper coordinates of the button widget in
order to move the popup window to the appropriate place with
gtk_window_move.

What I've been trying to do is:


static void on_b_thumbnail_enter (GtkButton * button, gpointer
user_data)
{
        int x, y;
        if (!popup) {
                popup = create_wInfo();
        }
        gdk_window_get_root_origin(wBrowser->window, &x, &y);
        x += (GTK_WIDGET(button)->allocation.x
                - GTK_WIDGET(popup)->allocation.width);
        y += GTK_WIDGET(button)->allocation.y;
        gtk_window_move(GTK_WINDOW(popup), x, y);
        gtk_widget_show(popup);
        (void) user_data;
}



but the popup window gets shown at all sorts of weird offsets,
especially since the button widget is placed inside a scrolled
window. All I need to know is where the button is at the time the
mouse pointer enters, but I can't see how. Do I have to dig
through all the nested container widgets to finally arrive at
the position of the button? Any hints?

--Daniel