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fd9ce27748
This does a cleanup of the examples, removing all of the "section" markers and extra comments that we don't need anymore now that the samples are no longer in the source code. It also removes the --template arguments from the {@tool dartpad} and {@tool sample} directives, since those are no longer used. It converts two examples that I discovered were still embedded into linked examples in the examples folder.
I didn't delete the templates from the snippets config folder yet, because there are still embedded samples in the dart:ui package from the engine that use them. Once dart:ui no longer uses the templates, they can be removed.
I bumped the version of the snippets package to pick up a change that allows removal of the --template argument.
62 lines
1.8 KiB
Dart
62 lines
1.8 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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// Flutter code sample for BuildOwner
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import 'package:flutter/material.dart';
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import 'package:flutter/rendering.dart';
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import 'package:flutter/widgets.dart';
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void main() {
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WidgetsFlutterBinding.ensureInitialized();
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final Size size = measureWidget(const SizedBox(width: 640, height: 480));
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// Just displays the size calculated above.
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runApp(
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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(
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body: Center(
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child: Text(size.toString()),
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),
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);
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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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