| // 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/material.dart'; |
| |
| import 'recorder.dart'; |
| |
| /// Measures how expensive it is to construct material checkboxes. |
| /// |
| /// Creates a 10x10 grid of tristate checkboxes. |
| class BenchBuildMaterialCheckbox extends WidgetBuildRecorder { |
| BenchBuildMaterialCheckbox() : super(name: benchmarkName); |
| |
| static const String benchmarkName = 'build_material_checkbox'; |
| |
| static bool? _isChecked; |
| |
| @override |
| Widget createWidget() { |
| return Directionality( |
| textDirection: TextDirection.ltr, |
| child: Material( |
| child: Column( |
| children: List<Widget>.generate(10, (int i) { |
| return _buildRow(); |
| }), |
| ), |
| ), |
| ); |
| } |
| |
| Row _buildRow() { |
| if (_isChecked == null) { |
| _isChecked = true; |
| } else if (_isChecked!) { |
| _isChecked = false; |
| } else { |
| _isChecked = null; |
| } |
| |
| return Row( |
| children: List<Widget>.generate(10, (int i) { |
| return Expanded( |
| child: Checkbox( |
| value: _isChecked, |
| tristate: true, |
| onChanged: (bool? newValue) { |
| // Intentionally empty. |
| }, |
| ), |
| ); |
| }), |
| ); |
| } |
| } |