// 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. import 'package:flutter/foundation.dart'; import 'package:flutter/gestures.dart'; import 'package:flutter/material.dart'; import 'package:flutter_test/flutter_test.dart'; import 'package:integration_test/integration_test.dart'; import 'package:macrobenchmarks/src/simple_scroll.dart'; void main() { final IntegrationTestWidgetsFlutterBinding binding = IntegrationTestWidgetsFlutterBinding.ensureInitialized(); testWidgets( 'Frame Counter and Input Delay for benchmarkLive', (WidgetTester tester) async { await tester.pumpWidget(const MaterialApp(home: Scaffold(body: SimpleScroll()))); await tester.pumpAndSettle(); final Offset location = tester.getCenter(find.byType(ListView)); int frameCount = 0; void frameCounter(Duration elapsed) { frameCount += 1; } tester.binding.addPersistentFrameCallback(frameCounter); const int timeInSecond = 1; const Duration totalTime = Duration(seconds: timeInSecond); const int moveEventNumber = timeInSecond * 120; // 120Hz const Offset movePerRun = Offset(0.0, -200.0 / moveEventNumber); final List<PointerEventRecord> records = <PointerEventRecord>[ PointerEventRecord(Duration.zero, <PointerEvent>[ PointerAddedEvent( position: location, ), PointerDownEvent( position: location, pointer: 1, ), ]), ...<PointerEventRecord>[ for (int t=0; t < moveEventNumber; t++) PointerEventRecord(totalTime * (t / moveEventNumber), <PointerEvent>[ PointerMoveEvent( timeStamp: totalTime * (t / moveEventNumber), position: location + movePerRun * t.toDouble(), pointer: 1, delta: movePerRun, ), ]), ], PointerEventRecord(totalTime, <PointerEvent>[ PointerUpEvent( // Deviate a little from integer number of frames to reduce flakiness timeStamp: totalTime - const Duration(milliseconds: 1), position: location + movePerRun * moveEventNumber.toDouble(), pointer: 1, ), ]), ]; binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.benchmarkLive; List<Duration> delays = await tester.handlePointerEventRecord(records); await tester.pumpAndSettle(); binding.reportData = <String, dynamic>{ 'benchmarkLive': _summarizeResult(frameCount, delays), }; await tester.idle(); await tester.binding.delayed(const Duration(milliseconds: 250)); binding.framePolicy = LiveTestWidgetsFlutterBindingFramePolicy.fullyLive; frameCount = 0; delays = await tester.handlePointerEventRecord(records); await tester.pumpAndSettle(); binding.reportData!['fullyLive'] = _summarizeResult(frameCount, delays); await tester.idle(); }, ); } Map<String, dynamic> _summarizeResult( final int frameCount, final List<Duration> delays, ) { assert(delays.length > 1); final List<int> delayedInMicro = delays.map<int>( (Duration delay) => delay.inMicroseconds, ).toList(); final List<int> delayedInMicroSorted = List<int>.from(delayedInMicro)..sort(); final int index90th = (delayedInMicroSorted.length * 0.90).round(); final int percentile90th = delayedInMicroSorted[index90th]; final int sum = delayedInMicroSorted.reduce((int a, int b) => a + b); final double averageDelay = sum.toDouble() / delayedInMicroSorted.length; return <String, dynamic>{ 'frame_count': frameCount, 'average_delay_millis': averageDelay / 1E3, '90th_percentile_delay_millis': percentile90th / 1E3, if (kDebugMode) 'delaysInMicro': delayedInMicro, }; }