ab2b0851a2
This adds a smoke test for every single API example. It also fixes 17 tests that had bugs in them, or were otherwise broken, and even fixes one actual bug in the framework, and one limitation in the framework. The bug in the framework is that NetworkImage's _loadAsync method had await response.drain<List<int>>();, but if the response is null, it will throw a cryptic exception saying that Null can't be assigned to List<int>. The fix was just to use await response.drain<void>(); instead. The limitation is that RelativePositionedTransition takes an Animation<Rect> rect parameter, and if you want to use a RectTween with it, the value emitted there is Rect?, and one of the examples was just casting from Animation<Rect> to Animation<Rect?>, which is invalid, so I modified RelativePositionedTransition to take a Rect? and just use Rect.zero if the rect is null.
110 lines
3.4 KiB
Dart
110 lines
3.4 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/stateful_widget_scaffold_center_freeform_state.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 SliverFadeTransition
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//
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//***************************************************************************
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//* ▼▼▼▼▼▼▼▼ description ▼▼▼▼▼▼▼▼ (do not modify or remove section marker)
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// Creates a [CustomScrollView] with a [SliverFixedExtentList] that uses a
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// [SliverFadeTransition] to fade the list in and out.
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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 Center(
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child: MyStatefulWidget(),
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),
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),
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);
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}
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}
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/// This is the stateful widget that the main application instantiates.
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class MyStatefulWidget extends StatefulWidget {
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const MyStatefulWidget({Key? key}) : super(key: key);
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@override
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State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
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}
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/// This is the private State class that goes with MyStatefulWidget.
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//********************************************************************
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//* ▼▼▼▼▼▼▼▼ code ▼▼▼▼▼▼▼▼ (do not modify or remove section marker)
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class _MyStatefulWidgetState extends State<MyStatefulWidget>
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with SingleTickerProviderStateMixin {
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late final AnimationController controller = AnimationController(
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duration: const Duration(milliseconds: 1000),
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vsync: this,
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);
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late final Animation<double> animation = CurvedAnimation(
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parent: controller,
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curve: Curves.easeIn,
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);
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@override
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void initState() {
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super.initState();
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animation.addStatusListener((AnimationStatus status) {
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if (status == AnimationStatus.completed) {
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controller.reverse();
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} else if (status == AnimationStatus.dismissed) {
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controller.forward();
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}
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});
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controller.forward();
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}
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@override
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void dispose() {
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controller.dispose();
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super.dispose();
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}
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@override
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Widget build(BuildContext context) {
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return CustomScrollView(slivers: <Widget>[
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SliverFadeTransition(
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opacity: animation,
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sliver: SliverFixedExtentList(
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itemExtent: 100.0,
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delegate: SliverChildBuilderDelegate(
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(BuildContext context, int index) {
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return Container(
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color: index.isEven ? Colors.indigo[200] : Colors.orange[200],
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);
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},
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childCount: 5,
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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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//* ▲▲▲▲▲▲▲▲ code ▲▲▲▲▲▲▲▲ (do not modify or remove section marker)
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//********************************************************************
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