Re: Obtaining coordinates of a widget

[Owen Taylor <otaylor redhat com>]

On Wed, 2003-03-19 at 05:48, Daniel Haude wrote:
> 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?

allocation.x/y are relative to the button's window, so:

 gdk_window_get_origin (button->window);
 
will work better. You can look at the gtkoptionmenu sources.

probably will work better. The other problem you are probably
having is that GTK_WIDGET(popup)->allocation.width isn't
going to hold anything useful until the popup is shown.

Something like:

      gtk_widget_size_request (popup, &requisition);
      width += requisition.width;
 
I*s probably the right thing to do there.

Regards,
                                                Owen