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b1d17c914d
We've gotten feedback that the VelocityTracker change was disruptive, though it did not break any of the flutter framework or customer tests. In order to make the change non-breaking, PointerDeviceKind parameter can be made optional. Nevertheless, this parameter should be provided so that the existing touch handlers can use more accurate gestures on mouse/stylus inputs, so we can encourage this by deprecating the default constructor and pointing users towards the VelocityTracker.withKind constructor that takes a non-optional parameter
52 lines
1.7 KiB
Dart
52 lines
1.7 KiB
Dart
// Copyright 2014 The Flutter Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:flutter/gestures.dart';
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import '../common.dart';
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import 'data/velocity_tracker_data.dart';
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const int _kNumIters = 10000;
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class TrackerBenchmark {
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TrackerBenchmark({ this.name, this.tracker });
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final VelocityTracker tracker;
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final String name;
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}
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void main() {
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assert(false, "Don't run benchmarks in checked mode! Use 'flutter run --release'.");
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final BenchmarkResultPrinter printer = BenchmarkResultPrinter();
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final List<TrackerBenchmark> benchmarks = <TrackerBenchmark>[
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TrackerBenchmark(name: 'velocity_tracker_iteration', tracker: VelocityTracker.withKind(PointerDeviceKind.touch)),
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TrackerBenchmark(name: 'velocity_tracker_iteration_ios_fling', tracker: IOSScrollViewFlingVelocityTracker(PointerDeviceKind.touch)),
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];
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final Stopwatch watch = Stopwatch();
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for (final TrackerBenchmark benchmark in benchmarks) {
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print('${benchmark.name} benchmark...');
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final VelocityTracker tracker = benchmark.tracker;
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watch.reset();
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watch.start();
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for (int i = 0; i < _kNumIters; i += 1) {
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for (final PointerEvent event in velocityEventData) {
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if (event is PointerDownEvent || event is PointerMoveEvent)
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tracker.addPosition(event.timeStamp, event.position);
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if (event is PointerUpEvent)
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tracker.getVelocity();
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}
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}
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watch.stop();
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printer.addResult(
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description: 'Velocity tracker: ${tracker.runtimeType}',
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value: watch.elapsedMicroseconds / _kNumIters,
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unit: 'µs per iteration',
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name: benchmark.name,
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);
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}
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printer.printToStdout();
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}
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