Hotfix threaded loading examples and sections issue #2499 (#2503)

* Fix threaded_loading example fighting for definition of `time` during testing

* (#2499) Allow for Falsey values for preventing dispatch in Sections

* linting pass

* modify sections to accept bools for `prevent_dispatch` and `prevent_dispatch_view`

arcade/examples/threaded_loading.py

@@ -29,7 +29,7 @@
 from __future__ import annotations
 
 import sys
-import time
+from time import sleep
 
 # Python's threading module has proven tools for working with threads, and
 # veteran developers may want to explore 3.13's new 'No-GIL' concurrency.
@@ -104,7 +104,7 @@ def _load_levels(self):
             with self._interaction_lock:
                 self._current_level = level
 
-            time.sleep(ARTIFICIAL_DELAY)  # "Slow" down (delete this line before use)
+            sleep(ARTIFICIAL_DELAY)  # "Slow" down (delete this line before use)
 
             # Since unhandled exceptions "kill" threads, we catch the only major
             # exception we expect. Level 4 is intentionally missing to test cases

arcade/sections.py

@@ -64,8 +64,8 @@ def __init__(
         name: str | None = None,
         accept_keyboard_keys: bool | Iterable = True,
         accept_mouse_events: bool | Iterable = True,
-        prevent_dispatch: Iterable | None = None,
-        prevent_dispatch_view: Iterable | None = None,
+        prevent_dispatch: Iterable | bool | None = None,
+        prevent_dispatch_view: Iterable | bool | None = None,
         local_mouse_coordinates: bool = False,
         enabled: bool = True,
         modal: bool = False,
@@ -96,10 +96,18 @@ def __init__(
         self.accept_mouse_events: bool | Iterable = accept_mouse_events
         """Arcade mouse events to accept."""
 
-        self.prevent_dispatch: Iterable = prevent_dispatch or {True}
+        if isinstance(prevent_dispatch, bool):
+            prevent_dispatch = {prevent_dispatch}
+        self.prevent_dispatch: Iterable = {True} if prevent_dispatch is None else prevent_dispatch
+        assert isinstance(self.prevent_dispatch, Iterable)
         """prevents events to propagate"""
 
-        self.prevent_dispatch_view: Iterable = prevent_dispatch_view or {True}
+        if isinstance(prevent_dispatch_view, bool):
+            prevent_dispatch_view = {prevent_dispatch_view}
+        self.prevent_dispatch_view: Iterable = (
+            {True} if prevent_dispatch_view is None else prevent_dispatch_view
+        )
+        assert isinstance(self.prevent_dispatch_view, Iterable)
         """prevents events to propagate to the view"""
 
         self.local_mouse_coordinates: bool = local_mouse_coordinates