Refactor: Remove all GDK dependencies from hidapi package

The hidapi hardware layer must not know or depend on any UI libraries.
Removes all GDK dependencies from the hidapi packages, which makes
testing of these modules easier and removes unwanted cross-dependencies.

Related #2480

lib/hidapi/hidapi_impl.py

@@ -23,10 +23,13 @@ Parts of this code are adapted from https://github.com/apmorton/pyhidapi
 which is MIT licensed.
 """
 
+from __future__ import annotations
+
 import atexit
 import ctypes
 import logging
 import platform
+import typing
 
 from threading import Thread
 from time import sleep
@@ -35,8 +38,9 @@ import gi
 
 from hidapi.common import DeviceInfo
 
-gi.require_version("Gdk", "3.0")
+if typing.TYPE_CHECKING:
-from gi.repository import GLib  # NOQA: E402
+    gi.require_version("Gdk", "3.0")
+    from gi.repository import GLib  # NOQA: E402
 
 logger = logging.getLogger(__name__)
 
@@ -311,13 +315,21 @@ def find_paired_node_wpid(receiver_path, index):
     return None
 
 
-def monitor_glib(callback, filterfn):
+def monitor_glib(glib: GLib, callback, filterfn):
+    """Monitor GLib.
+
+    Parameters
+    ----------
+    glib
+        GLib instance.
+    """
+
     def device_callback(action, device):
         # print(f"device_callback({action}): {device}")
         if action == "add":
             d_info = _match(action, device, filterfn)
             if d_info:
-                GLib.idle_add(callback, action, d_info)
+                glib.idle_add(callback, action, d_info)
         elif action == "remove":
             # Removed devices will be detected by Solaar directly
             pass

lib/hidapi/udev_impl.py

@@ -23,9 +23,12 @@ The docstrings are mostly copied from the hidapi API header, with changes where
 necessary.
 """
 
+from __future__ import annotations
+
 import errno
 import logging
 import os
+import typing
 import warnings
 
 
@@ -39,8 +42,9 @@ import pyudev
 
 from hidapi.common import DeviceInfo
 
-gi.require_version("Gdk", "3.0")
+if typing.TYPE_CHECKING:
-from gi.repository import GLib  # NOQA: E402
+    gi.require_version("Gdk", "3.0")
+    from gi.repository import GLib  # NOQA: E402
 
 logger = logging.getLogger(__name__)
 
@@ -213,13 +217,20 @@ def find_paired_node_wpid(receiver_path, index):
     return None
 
 
-def monitor_glib(callback, filterfn):
+def monitor_glib(glib: GLib, callback, filterfn):
+    """Monitor GLib.
+
+    Parameters
+    ----------
+    glib
+        GLib instance.
+    """
     c = pyudev.Context()
     m = pyudev.Monitor.from_netlink(c)
     m.filter_by(subsystem="hidraw")
 
     def _process_udev_event(monitor, condition, cb, filterfn):
-        if condition == GLib.IO_IN:
+        if condition == glib.IO_IN:
             event = monitor.receive_device()
             if event:
                 action, device = event
@@ -227,7 +238,7 @@ def monitor_glib(callback, filterfn):
                 if action == "add":
                     d_info = _match(action, device, filterfn)
                     if d_info:
-                        GLib.idle_add(cb, action, d_info)
+                        glib.idle_add(cb, action, d_info)
                 elif action == "remove":
                     # the GLib notification does _not_ match!
                     pass
@@ -235,13 +246,13 @@ def monitor_glib(callback, filterfn):
 
     try:
         # io_add_watch_full may not be available...
-        GLib.io_add_watch_full(m, GLib.PRIORITY_LOW, GLib.IO_IN, _process_udev_event, callback, filterfn)
+        glib.io_add_watch_full(m, glib.PRIORITY_LOW, glib.IO_IN, _process_udev_event, callback, filterfn)
     except AttributeError:
         try:
             # and the priority parameter appeared later in the API
-            GLib.io_add_watch(m, GLib.PRIORITY_LOW, GLib.IO_IN, _process_udev_event, callback, filterfn)
+            glib.io_add_watch(m, glib.PRIORITY_LOW, glib.IO_IN, _process_udev_event, callback, filterfn)
         except Exception:
-            GLib.io_add_watch(m, GLib.IO_IN, _process_udev_event, callback, filterfn)
+            glib.io_add_watch(m, glib.IO_IN, _process_udev_event, callback, filterfn)
 
     if logger.isEnabledFor(logging.DEBUG):
         logger.debug("Starting dbus monitoring")

lib/logitech_receiver/base.py

@@ -29,6 +29,7 @@ from random import getrandbits
 from time import time
 from typing import Any
 
+import gi
 import hidapi
 
 from . import base_usb
@@ -41,6 +42,9 @@ from . import hidpp20_constants
 from .common import LOGITECH_VENDOR_ID
 from .common import BusID
 
+gi.require_version("Gdk", "3.0")
+from gi.repository import GLib  # NOQA: E402
+
 logger = logging.getLogger(__name__)
 
 _hidpp20 = hidpp20.Hidpp20()
@@ -176,7 +180,7 @@ def receivers_and_devices():
 
 def notify_on_receivers_glib(callback):
     """Watch for matching devices and notifies the callback on the GLib thread."""
-    return hidapi.monitor_glib(callback, filter)
+    return hidapi.monitor_glib(GLib, callback, filter)
 
 
 def open_path(path):