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5491c8c146
This auto-formats all *.dart files in the repository outside of the `engine` subdirectory and enforces that these files stay formatted with a presubmit check. **Reviewers:** Please carefully review all the commits except for the one titled "formatted". The "formatted" commit was auto-generated by running `dev/tools/format.sh -a -f`. The other commits were hand-crafted to prepare the repo for the formatting change. I recommend reviewing the commits one-by-one via the "Commits" tab and avoiding Github's "Files changed" tab as it will likely slow down your browser because of the size of this PR. --------- Co-authored-by: Kate Lovett <katelovett@google.com> Co-authored-by: LongCatIsLooong <31859944+LongCatIsLooong@users.noreply.github.com>
74 lines
2.0 KiB
Dart
74 lines
2.0 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/material.dart';
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import 'package:flutter/rendering.dart';
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/// Flutter code sample for [BuildOwner].
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void main() {
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runApp(const BuildOwnerExample());
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}
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class BuildOwnerExample extends StatefulWidget {
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const BuildOwnerExample({super.key});
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@override
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State<BuildOwnerExample> createState() => _BuildOwnerExampleState();
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}
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class _BuildOwnerExampleState extends State<BuildOwnerExample> {
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late final Size size;
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@override
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void initState() {
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super.initState();
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size = measureWidget(const SizedBox(width: 640, height: 480));
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}
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@override
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Widget build(BuildContext context) {
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// Just displays the size calculated above.
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return WidgetsApp(
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title: 'BuildOwner Sample',
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color: const Color(0xff000000),
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builder: (BuildContext context, Widget? child) {
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return Scaffold(body: Center(child: Text(size.toString())));
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},
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);
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}
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}
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Size measureWidget(Widget widget) {
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final PipelineOwner pipelineOwner = PipelineOwner();
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final MeasurementView rootView = pipelineOwner.rootNode = MeasurementView();
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final BuildOwner buildOwner = BuildOwner(focusManager: FocusManager());
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final RenderObjectToWidgetElement<RenderBox> element = RenderObjectToWidgetAdapter<RenderBox>(
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container: rootView,
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debugShortDescription: '[root]',
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child: widget,
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).attachToRenderTree(buildOwner);
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try {
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rootView.scheduleInitialLayout();
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pipelineOwner.flushLayout();
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return rootView.size;
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} finally {
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// Clean up.
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element.update(RenderObjectToWidgetAdapter<RenderBox>(container: rootView));
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buildOwner.finalizeTree();
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}
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}
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class MeasurementView extends RenderBox with RenderObjectWithChildMixin<RenderBox> {
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@override
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void performLayout() {
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assert(child != null);
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child!.layout(const BoxConstraints(), parentUsesSize: true);
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size = child!.size;
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}
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@override
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void debugAssertDoesMeetConstraints() => true;
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}
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