How to use GTK4 to read windows changed X and Y on Move/Resize Events?

I want to get a GTK4 Window’s X, Y, Height and Width coordinates.

Using GTK3, we could register a configure-event callback to get window size changes.

  g_signal_connect(G_OBJECT(window), "configure-event",
        G_CALLBACK(frame_callback), NULL);

And in the callback we could get the x and y position of the window with:

void frame_callback(GtkWindow *window, 
      GdkEvent *event, gpointer data)
{
   int x, y;
   char buf[10];
   x = event->configure.x;
   y = event->configure.y;
   sprintf(buf, "%d, %d", x, y);
   gtk_window_set_title(window, buf);
}

Much less clear how to get this in GTK4, if at all…
The GTK 3 to GTK 4 migration guide notes that:

  • If you were using ::configure-event and ::window-state-event to save window state, you should use property notification for corresponding GtkWindow properties, such as GtkWindow:default-width, GtkWindow:default-height, GtkWindow:maximized or GtkWindow:fullscreened.

So I presume that I need to use GObject > Object::notify however I do not see an X or Y coordinate on the window that I can watch.

From the signal notify page…

g_signal_connect (text_view->buffer, "notify::paste-target-list",
                  G_CALLBACK (gtk_text_view_target_list_notify),
                  text_view)

It is important to note that you must use 
[canonical parameter names][canonical-parameter-names]
as detail strings for the notify signal.

I’ve read about Wayland having a different idea about X and Y window coordinates, so I hope that GTK4 window positions haven’t been removed in pursuit of being more like Wayland…

Wayland on desktops has no official way to position
windows from the client by global or per-output x,y coordinates. This
is by design for desktops. On the desktop, the window manager is the
only one that knows enough to be able to position windows correctly.

That’s pretty much what happened. You’ll have to use backend-specific API like XGetGeometry().

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