Re: [gtk-list] position of widget / widget at position

[Owen Taylor <otaylor redhat com>]

Etienne Grossmann <etienne@anonimo.isr.ist.utl.pt> writes:

>   Hello,
> 
>   I learned from the "Window size" thread how to determin the size of
> a widget. 
> 
>   I looked into the doc, and found no way of doing the following :
> 
> 
> - What is the x,y position (absolute screen coordinates, or relative
>   to the "toplevel" gtk window) of a widget?
> 
>   I know of the functions, 
> 
>   void gdk_window_get_position (GdkWindow *window,
> 			        gint *x,
> 				gint *y);
>   void gdk_window_get_size (GdkWindow *window,
> 			    gint *width,
> 			    gint *height);
> 
>   but I can't find how to use them with gtk objects.

You can access the GdkWindow for a widget with widget->window.

A fail-safe way of getting the absolute screen coordinates
for a GtkWidget would be something like:

====
if (GTK_WIDGET_TOPLEVEL (widget))
  gdk_window_get_position (widget->window, &x, &y);
else
  {
    GdkWindow *window;

    if (GTK_WIDGET_NO_WINDOW (widget))
      window = widget->window;
    else
      window = gdk_window_get_parent (widget->window);

    gdk_window_get_position (window, &x, &y);

    x += widget->allocation.x;
    y += widget->allocation.y;
  }
====

> - What is the widget at position x,y?

This is a little harder - there is a lot of address translation
going on. The following routines (I wrote these very
recently, and haven't tested them much yet) may help.

Regards,
                                        Owen

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