33403bd28e
This extracts the sample code out from the API doc comments, and places them in separate files on disk, allowing running of the examples locally, testing them, and building of slightly larger examples.
74 lines
2.5 KiB
Dart
74 lines
2.5 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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// Template: dev/snippets/config/templates/stateless_widget_scaffold.tmpl
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//
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// Comment lines marked with "▼▼▼" and "▲▲▲" are used for authoring
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// of samples, and may be ignored if you are just exploring the sample.
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// Flutter code sample for AspectRatio
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//
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//***************************************************************************
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//* ▼▼▼▼▼▼▼▼ description ▼▼▼▼▼▼▼▼ (do not modify or remove section marker)
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// This examples shows how AspectRatio sets width when its parent's width
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// constraint is infinite. Since its parent's allowed height is a fixed value,
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// the actual width is determined via the given AspectRatio.
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//
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// Since the height is fixed at 100.0 in this example and the aspect ratio is
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// set to 16 / 9, the width should then be 100.0 / 9 * 16.
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//* ▲▲▲▲▲▲▲▲ description ▲▲▲▲▲▲▲▲ (do not modify or remove section marker)
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//***************************************************************************
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import 'package:flutter/material.dart';
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void main() => runApp(const MyApp());
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/// This is the main application widget.
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class MyApp extends StatelessWidget {
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const MyApp({Key? key}) : super(key: key);
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static const String _title = 'Flutter Code Sample';
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: _title,
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home: Scaffold(
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appBar: AppBar(title: const Text(_title)),
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body: const MyStatelessWidget(),
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),
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);
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}
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}
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/// This is the stateless widget that the main application instantiates.
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class MyStatelessWidget extends StatelessWidget {
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const MyStatelessWidget({Key? key}) : super(key: key);
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@override
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//********************************************************************
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//* ▼▼▼▼▼▼▼▼ code ▼▼▼▼▼▼▼▼ (do not modify or remove section marker)
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Widget build(BuildContext context) {
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return Container(
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color: Colors.blue,
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alignment: Alignment.center,
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width: double.infinity,
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height: 100.0,
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child: AspectRatio(
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aspectRatio: 16 / 9,
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child: Container(
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color: Colors.green,
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),
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),
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);
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}
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//* ▲▲▲▲▲▲▲▲ code ▲▲▲▲▲▲▲▲ (do not modify or remove section marker)
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//********************************************************************
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}
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