Managers use callback functions instead of signals

src/store/managers/async_manager.py

@@ -1,3 +1,5 @@
+from typing import Callable
+
 from gi.repository import Gio
 
 from src.game import Game
@@ -24,18 +26,17 @@ class AsyncManager(Manager):
         Already scheduled Tasks will no longer be cancellable."""
         self.cancellable = Gio.Cancellable()
 
-    def run(self, game: Game) -> None:
-        data = (game,)
-        task = Task.new(self, self.cancellable, self._task_callback, data)
-        task.set_task_data(data)
+    def run(self, game: Game, callback: Callable) -> None:
+        task = Task.new(self, self.cancellable, self._task_callback, (callback,))
+        task.set_task_data((game,))
         task.run_in_thread(self._task_thread_func)
 
     def _task_thread_func(self, _task, _source_object, data, cancellable):
         """Task thread entry point"""
         game, *_rest = data
-        self.emit("started")
         self.final_run(game)
 
-    def _task_callback(self, _source_object, _result, _data):
+    def _task_callback(self, _source_object, _result, data):
         """Method run after the async task is done"""
-        self.emit("done")
+        _game, callback, *_rest = data
+        callback(self)