fix tests and add test for event handling

tests/unit/section/test_event_handing.py

@@ -0,0 +1,128 @@
+import arcade
+from arcade import SectionManager, Section
+
+
+class RecorderView(arcade.View):
+    def __init__(self):
+        super().__init__()
+
+        self.section_manager = SectionManager(self)
+        self.events = []
+
+    def on_mouse_enter(self, x: float, y: float):
+        self.events.append("on_mouse_enter")
+
+    def on_mouse_motion(self, x: float, y: float, dx: float, dy: float):
+        self.events.append("on_mouse_motion")
+
+    def on_mouse_leave(self, x: float, y: float):
+        self.events.append("on_mouse_leave")
+
+    def on_mouse_press(self, x: float, y: float, button: int, modifiers: int):
+        self.events.append("on_mouse_press")
+
+    def on_mouse_release(self, x: float, y: float, button: int, modifiers: int):
+        self.events.append("on_mouse_release")
+
+    def on_show_view(self) -> None:
+        self.section_manager.enable()
+
+    def on_hide_view(self) -> None:
+        self.section_manager.disable()
+
+    def on_update(self, delta_time: float):
+        self.events.append("on_update")
+
+    def on_draw(self):
+        self.events.append("on_draw")
+
+
+class RecorderSection(Section):
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+        self.events = []
+
+    def on_mouse_enter(self, x: float, y: float):
+        self.events.append("on_mouse_enter")
+
+    def on_mouse_leave(self, x: float, y: float):
+        self.events.append("on_mouse_leave")
+
+    def on_mouse_press(self, x: float, y: float, button: int, modifiers: int):
+        self.events.append("on_mouse_press")
+
+    def on_mouse_release(self, x: float, y: float, button: int, modifiers: int):
+        self.events.append("on_mouse_release")
+
+    def on_update(self, delta_time: float):
+        self.events.append("on_update")
+
+    def on_draw(self):
+        self.events.append("on_draw")
+
+
+def test_section_manager_enable_event_handling(window):
+    # GIVEN
+    view = RecorderView()
+    manager = view.section_manager
+
+    # SETUP
+    recorder_section = RecorderSection(
+        *window.rect.lbwh,
+    )
+    manager.add_section(section=recorder_section)
+    window.show_view(view)
+
+    # WHEN
+
+    window.dispatch_event("on_mouse_motion", 10, 10, 0, 0)
+    # mouse motion will trigger mouse enter automatically
+    window.dispatch_event("on_mouse_press", 11, 11, arcade.MOUSE_BUTTON_LEFT, 0)
+    window.dispatch_event("on_mouse_release", 11, 11, arcade.MOUSE_BUTTON_LEFT, 0)
+    window.dispatch_event("on_draw")
+    window.dispatch_event("on_update", 1 / 60)
+    window.dispatch_event("on_mouse_leave", 10, 10)
+    window.dispatch_events()
+
+    # THEN
+    assert recorder_section.events == [
+        "on_mouse_enter",
+        "on_mouse_press",
+        "on_mouse_release",
+        "on_draw",
+        "on_update",
+        "on_mouse_leave",
+    ]
+
+
+def test_view_receives_events_once(window):
+    # GIVEN
+    view = RecorderView()
+    manager = view.section_manager
+
+    # SETUP
+    recorder_section = RecorderSection(
+        *window.rect.lbwh, prevent_dispatch_view={False}, prevent_dispatch={True}
+    )
+    manager.add_section(section=recorder_section)
+    window.show_view(view)
+
+    # WHEN
+    window.dispatch_event("on_mouse_motion", 10, 10, 0, 0)
+    window.dispatch_event("on_mouse_press", 10, 10, arcade.MOUSE_BUTTON_LEFT, 0)
+    window.dispatch_event("on_mouse_release", 10, 10, arcade.MOUSE_BUTTON_LEFT, 0)
+    window.dispatch_event("on_mouse_leave", 10, 10)
+    window.dispatch_event("on_draw")
+    window.dispatch_event("on_update", 1 / 60)
+    window.dispatch_events()
+
+    # THEN
+    assert view.events == [
+        "on_mouse_enter",
+        "on_mouse_motion",
+        "on_mouse_press",
+        "on_mouse_release",
+        "on_mouse_leave",
+        "on_draw",
+        "on_update",
+    ]