Is it still possible to set transient to Control Center's window?

[yookoala (Koala Yeung)]

For setting applications that is launched by the control center, there used to be environment variable where you can get the parent window’s ID and then set yourself to be a “child” of it.

from os import environ
import gi
from gi.repository import Gdk, GdkX11

...

if 'GNOME_CONTROL_CENTER_XID' in environ:
    xid = int(environ['GNOME_CONTROL_CENTER_XID'])
    window.set_modal(True)
    window.connect('notify::window', self.set_transient)
    window.set_type_hint(Gdk.WindowTypeHint.DIALOG)
    w = window.get_window()
    if w != None:
        parent = GdkX11.X11Window.foreign_new_for_display(
                         Gdk.Display.get_default(), xid)

In wayland, is this not possible anymore?

GtkWayland have a set_transient_for_exported function. It takes a parent_handle_str, which I have no idea how to get. Nor do I know if it works the way as expected.

[ebassi (Emmanuele Bassi)]

@yookoala

In wayland, is this not possible anymore?

Not really, no.

It’s also not possible under X11, since 2021, when gnome-control-center was ported to libadwaita and a new UI.