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---
title: Fade a widget in and out
prev:
  title: Animate the properties of a container
  path: /docs/cookbook/animation/animated-container
next:
  title: Add a drawer to a screen
  path: /docs/cookbook/design/drawer
---

brianegan

import 'package:flutter/material.dart';

void main() => runApp(SnackBarDemo());

class SnackBarDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'SnackBar Demo',
      home: Scaffold(

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import 'dart:math';

import 'package:flutter/material.dart';

void main() => runApp(AnimatedContainerApp());

class AnimatedContainerApp extends StatefulWidget {
  @override
  _AnimatedContainerAppState createState() => _AnimatedContainerAppState();
}

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import 'package:flutter/material.dart';
import 'package:shimmer/shimmer.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',

brianegan

import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

class Counter extends ChangeNotifier {
  int value;

  Counter([this.value = 0]);

  void increment() {
    value++;

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import 'dart:async';

import 'package:bloc/bloc.dart';
import 'package:mockito/mockito.dart';
import 'package:test/test.dart';

enum CounterEvent { increment, decrement }

class CounterBloc extends Bloc<CounterEvent, int> {
  @override

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import 'dart:async';

import 'package:bloc/bloc.dart';
import 'package:mockito/mockito.dart';
import 'package:test/test.dart';

enum CounterEvent { increment, decrement }

class CounterBloc extends Bloc<CounterEvent, int> {
  @override

brianegan

import 'dart:async';

import 'package:bloc/bloc.dart';
import 'package:mockito/mockito.dart';
import 'package:test/test.dart';

enum CounterEvent { increment, decrement }

class CounterBloc extends Bloc<CounterEvent, int> {
  @override

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// This is a basic Flutter widget test.
//
// To perform an interaction with a widget in your test, use the WidgetTester
// utility that Flutter provides. For example, you can send tap and scroll
// gestures. You can also use WidgetTester to find child widgets in the widget
// tree, read text, and verify that the values of widget properties are correct.

import 'dart:convert';

import 'package:flutter/material.dart';

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import 'package:flutter/material.dart';

void main() {
  runApp(TabBarDemo());
}

class TabBarDemo extends StatefulWidget {
  @override
  _TabBarDemoState createState() => _TabBarDemoState();
}