Add resampler unit test with widget (#64424)
diff --git a/packages/flutter/test/gestures/gesture_binding_resample_event_on_widget_test.dart b/packages/flutter/test/gestures/gesture_binding_resample_event_on_widget_test.dart
new file mode 100644
index 0000000..b968269
--- /dev/null
+++ b/packages/flutter/test/gestures/gesture_binding_resample_event_on_widget_test.dart
@@ -0,0 +1,119 @@
+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// @dart = 2.8
+
+// Logically this file should be part of `gesture_binding_test.dart` but is here
+// due to conflict of `flutter_test` and `package:test`.
+// See https://github.com/dart-lang/matcher/issues/98
+// TODO(CareF): Consider combine this file back to `gesture_binding_test.dart`
+// after #98 is fixed.
+
+import 'dart:ui' as ui;
+
+import 'package:flutter/gestures.dart';
+import 'package:flutter/widgets.dart';
+import 'package:flutter_test/flutter_test.dart';
+
+class PointerDataAutomatedTestWidgetsFlutterBinding extends AutomatedTestWidgetsFlutterBinding {
+ // PointerData injection would usually considerred device input and therefore
+ // blocked by [AutomatedTestWidgetsFlutterBinding]. Override this behavior
+ // to help events go into widget tree.
+ @override
+ void dispatchEvent(
+ PointerEvent event,
+ HitTestResult hitTestResult, {
+ TestBindingEventSource source = TestBindingEventSource.device,
+ }) {
+ super.dispatchEvent(event, hitTestResult, source: TestBindingEventSource.test);
+ }
+}
+
+void main() {
+ final TestWidgetsFlutterBinding binding = PointerDataAutomatedTestWidgetsFlutterBinding();
+ testWidgets('PointerEvent resampling on a widget', (WidgetTester tester) async {
+ assert(WidgetsBinding.instance == binding);
+ Duration currentTestFrameTime() => Duration(milliseconds: binding.clock.now().millisecondsSinceEpoch);
+ final Duration epoch = currentTestFrameTime();
+ final ui.PointerDataPacket packet = ui.PointerDataPacket(
+ data: <ui.PointerData>[
+ ui.PointerData(
+ change: ui.PointerChange.add,
+ physicalX: 0.0,
+ timeStamp: epoch + const Duration(milliseconds: 0),
+ ),
+ ui.PointerData(
+ change: ui.PointerChange.down,
+ physicalX: 0.0,
+ timeStamp: epoch + const Duration(milliseconds: 1),
+ ),
+ ui.PointerData(
+ change: ui.PointerChange.move,
+ physicalX: 10.0,
+ timeStamp: epoch + const Duration(milliseconds: 2),
+ ),
+ ui.PointerData(
+ change: ui.PointerChange.move,
+ physicalX: 20.0,
+ timeStamp: epoch + const Duration(milliseconds: 3),
+ ),
+ ui.PointerData(
+ change: ui.PointerChange.move,
+ physicalX: 30.0,
+ timeStamp: epoch + const Duration(milliseconds: 4),
+ ),
+ ui.PointerData(
+ change: ui.PointerChange.up,
+ physicalX: 40.0,
+ timeStamp: epoch + const Duration(milliseconds: 5),
+ ),
+ ui.PointerData(
+ change: ui.PointerChange.remove,
+ physicalX: 40.0,
+ timeStamp: epoch + const Duration(milliseconds: 6),
+ ),
+ ],
+ );
+
+ final List<PointerEvent> events = <PointerEvent>[];
+ await tester.pumpWidget(
+ Directionality(
+ textDirection: TextDirection.ltr,
+ child: Listener(
+ onPointerDown: (PointerDownEvent event) => events.add(event),
+ onPointerMove: (PointerMoveEvent event) => events.add(event),
+ onPointerUp: (PointerUpEvent event) => events.add(event),
+ child: const Text('test'),
+ ),
+ ),
+ );
+
+ GestureBinding.instance.resamplingEnabled = true;
+ const Duration kSamplingOffset = Duration(microseconds: -5500);
+ GestureBinding.instance.samplingOffset = kSamplingOffset;
+ ui.window.onPointerDataPacket(packet);
+ expect(events.length, 0);
+
+ await tester.pump(const Duration(milliseconds: 7));
+ expect(events.length, 1);
+ expect(events[0].runtimeType, equals(PointerDownEvent));
+ expect(events[0].timeStamp, currentTestFrameTime() + kSamplingOffset);
+ expect(events[0].position, Offset(5.0 / ui.window.devicePixelRatio, 0.0));
+
+ // Now the system time is epoch + 9ms
+ await tester.pump(const Duration(milliseconds: 2));
+ expect(events.length, 2);
+ expect(events[1].timeStamp, currentTestFrameTime() + kSamplingOffset);
+ expect(events[1].runtimeType, equals(PointerMoveEvent));
+ expect(events[1].position, Offset(25.0 / ui.window.devicePixelRatio, 0.0));
+ expect(events[1].delta, Offset(20.0 / ui.window.devicePixelRatio, 0.0));
+
+ // Now the system time is epoch + 11ms
+ await tester.pump(const Duration(milliseconds: 2));
+ expect(events.length, 3);
+ expect(events[2].timeStamp, currentTestFrameTime() + kSamplingOffset);
+ expect(events[2].runtimeType, equals(PointerUpEvent));
+ expect(events[2].position, Offset(40.0 / ui.window.devicePixelRatio, 0.0));
+ });
+}
diff --git a/packages/flutter/test/gestures/gesture_binding_test.dart b/packages/flutter/test/gestures/gesture_binding_test.dart
index af384d0..cb38bb8 100644
--- a/packages/flutter/test/gestures/gesture_binding_test.dart
+++ b/packages/flutter/test/gestures/gesture_binding_test.dart
@@ -315,107 +315,4 @@
expect(events[4].buttons, equals(0));
}
});
-
- test('Pointer event resampling', () {
- const ui.PointerDataPacket packet = ui.PointerDataPacket(
- data: <ui.PointerData>[
- ui.PointerData(
- change: ui.PointerChange.add,
- physicalX: 0.0,
- timeStamp: Duration(milliseconds: 0),
- ),
- ui.PointerData(
- change: ui.PointerChange.down,
- physicalX: 0.0,
- timeStamp: Duration(milliseconds: 1),
- ),
- ui.PointerData(
- change: ui.PointerChange.move,
- physicalX: 10.0,
- timeStamp: Duration(milliseconds: 2),
- ),
- ui.PointerData(
- change: ui.PointerChange.move,
- physicalX: 20.0,
- timeStamp: Duration(milliseconds: 3),
- ),
- ui.PointerData(
- change: ui.PointerChange.move,
- physicalX: 30.0,
- timeStamp: Duration(milliseconds: 4),
- ),
- ui.PointerData(
- change: ui.PointerChange.up,
- physicalX: 40.0,
- timeStamp: Duration(milliseconds: 5),
- ),
- ui.PointerData(
- change: ui.PointerChange.remove,
- physicalX: 40.0,
- timeStamp: Duration(milliseconds: 6),
- ),
- ],
- );
-
- final List<PointerEvent> pointerRouterEvents = <PointerEvent>[];
- GestureBinding.instance.pointerRouter.addGlobalRoute(pointerRouterEvents.add);
-
- final List<PointerEvent> events = <PointerEvent>[];
- _binding.callback = events.add;
-
- GestureBinding.instance.resamplingEnabled = true;
- GestureBinding.instance.samplingOffset = const Duration(microseconds: -5500);
-
- ui.window.onPointerDataPacket(packet);
-
- // No pointer events should have been dispatched yet.
- expect(events.length, 0);
-
- // Frame callback should have been requested.
- FrameCallback callback = _binding.frameCallback;
- _binding.frameCallback = null;
- expect(callback, isNotNull);
-
- _binding.frameTime = const Duration(milliseconds: 7);
- callback(Duration.zero);
-
- // One pointer event should have been dispatched.
- expect(events.length, 1);
- expect(events[0].runtimeType, equals(PointerDownEvent));
- expect(events[0].timeStamp, _binding.frameTime + GestureBinding.instance.samplingOffset);
- expect(events[0].position, Offset(5.0 / ui.window.devicePixelRatio, 0.0));
-
- // Second frame callback should have been requested.
- callback = _binding.frameCallback;
- _binding.frameCallback = null;
- expect(callback, isNotNull);
-
- _binding.frameTime = const Duration(milliseconds: 9);
- callback(Duration.zero);
-
- // Second pointer event should have been dispatched.
- expect(events.length, 2);
- expect(events[1].timeStamp, _binding.frameTime + GestureBinding.instance.samplingOffset);
- expect(events[1].runtimeType, equals(PointerMoveEvent));
- expect(events[1].position, Offset(25.0 / ui.window.devicePixelRatio, 0.0));
- expect(events[1].delta, Offset(20.0 / ui.window.devicePixelRatio, 0.0));
-
- // Third frame callback should have been requested.
- callback = _binding.frameCallback;
- _binding.frameCallback = null;
- expect(callback, isNotNull);
-
- _binding.frameTime = const Duration(milliseconds: 11);
- callback(Duration.zero);
-
- // Third pointer event should have been dispatched.
- expect(events.length, 3);
- expect(events[2].timeStamp, _binding.frameTime + GestureBinding.instance.samplingOffset);
- expect(events[2].runtimeType, equals(PointerUpEvent));
- expect(events[2].position, Offset(40.0 / ui.window.devicePixelRatio, 0.0));
-
- // No frame callback should have been requested.
- callback = _binding.frameCallback;
- expect(callback, isNull);
- });
}
