Add a fully functioning pure-Python event loop

Author: almarklein

examples/cube_trio.py

@@ -2,7 +2,7 @@
 Cube trio
 ---------
 
-Run a wgpu example on the glfw backend, and the trio loop
+Run a wgpu example on the glfw backend, and the trio loop.
 """
 
 import trio

examples/demo.py

@@ -22,7 +22,7 @@
 
 canvas = RenderCanvas(
     size=(640, 480),
-    title="Canvas events with $backend - $fps fps",
+    title="Canvas events with $backend on $loop - $fps fps",
     max_fps=10,
     update_mode="continuous",
     present_method="",

rendercanvas/_loop.py

@@ -137,7 +137,7 @@ async def _loop_task(self):
                         del canvas
 
         finally:
-            self._stop()
+            self.__stop()
 
     def add_task(self, async_func, *args, name="unnamed"):
         """Run an async function in the event-loop.
@@ -260,9 +260,9 @@ def stop(self):
         self.__should_stop += 1
         if self.__should_stop >= 4:
             # If for some reason the tick method is no longer being called, but the loop is still running, we can still stop it by spamming stop() :)
-            self._stop()
+            self.__stop()
 
-    def _stop(self):
+    def __stop(self):
         """Move to the off-state."""
         # If we used the async adapter, cancel any tasks
         while self.__tasks:

tests/test_backends.py

@@ -146,9 +146,9 @@ def test_meta():
             continue
         module_name = fname.split(".")[0]
         test_func_name = f"test_{module_name}_module"
-        assert (
-            test_func_name in all_test_names
-        ), f"Test missing for {module_name} module"
+        assert test_func_name in all_test_names, (
+            f"Test missing for {module_name} module"
+        )
 
 
 def test_ref_rc_methods():

tests/test_events.py

@@ -352,7 +352,7 @@ def handler(event):
         ee.sync_flush()
     t2 = time.perf_counter() - t0
 
-    print(f"add_handler: {1000*t1:0.0f} ms, emit: {1000*t2:0.0f} ms")
+    print(f"add_handler: {1000 * t1:0.0f} ms, emit: {1000 * t2:0.0f} ms")
 
 
 if __name__ == "__main__":