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11e0a725d4
This is a re-land of #31561, after fixing performance regressions. Added change listening to the MouseTracker so that the Listener and tooltip can react to whether or not a mouse is connected at all. Added a change check to make sure Listener only repaints when something changed. Fixes #22817
37 lines
1.1 KiB
Dart
37 lines
1.1 KiB
Dart
// Copyright 2016 The Chromium 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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void main() {
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assert(false, "Don't run benchmarks in checked mode! Use 'flutter run --release'.");
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final VelocityTracker tracker = VelocityTracker();
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final Stopwatch watch = Stopwatch();
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print('Velocity tracker benchmark...');
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watch.start();
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for (int i = 0; i < _kNumIters; i += 1) {
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for (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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final BenchmarkResultPrinter printer = BenchmarkResultPrinter();
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printer.addResult(
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description: 'Velocity tracker',
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value: watch.elapsedMicroseconds / _kNumIters,
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unit: 'µs per iteration',
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name: 'velocity_tracker_iteration',
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);
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printer.printToStdout();
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}
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