loading_animation_widget 1.1.0+3

Loading animation or loading spiner or loader. It's used to show loading animation when the app is in loading state or something is processing for uncertain time.

example/lib/main.dart

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

const Color _kAppColor = Color(0xFFFDDE6F);
const double _kSize = 100;
void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData(
        canvasColor: _kAppColor,
        snackBarTheme: const SnackBarThemeData(
          backgroundColor: Colors.brown,
          contentTextStyle: TextStyle(
            fontSize: 20,
          ),
        ),
      ),
      home: const HomePage(),
    );
  }
}

class HomePage extends StatefulWidget {
  const HomePage({Key? key}) : super(key: key);

  @override
  _HomePageState createState() => _HomePageState();
}

class _HomePageState extends State<HomePage> {
  late PageController _pageController;
  int _currentPage = 0;

  @override
  void initState() {
    super.initState();
    _pageController = PageController(initialPage: _currentPage);
  }

  void _onTapNext() {
    if (_currentPage + 1 < listOfAnimations.length) {
      _pageController.jumpToPage(_currentPage + 1);
      setState(() {
        _currentPage++;
      });
    } else {
      _pageController.animateToPage(
        0,
        duration: const Duration(milliseconds: 800),
        curve: Curves.ease,
      );
      setState(() {
        _currentPage = 0;
      });
    }
  }

  void _onTapPrevious() {
    if (_currentPage == 0) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          content: Text(
            'There is nothing left 🌚',
          ),
        ),
      );
    } else {
      _pageController.jumpToPage(_currentPage - 1);
      setState(() {
        _currentPage--;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return PageView(
      physics: const NeverScrollableScrollPhysics(),
      controller: _pageController,
      children: listOfAnimations
          .map(
            (appBody) => Scaffold(
              body: Column(
                crossAxisAlignment: CrossAxisAlignment.center,
                children: [
                  SafeArea(
                    bottom: false,
                    child: Text(
                      appBody.title,
                      style: const TextStyle(
                        fontSize: 22,
                        fontWeight: FontWeight.w500,
                      ),
                    ),
                  ),
                  Expanded(
                    child: Center(
                      child: appBody.widget,
                    ),
                  ),
                ],
              ),
              bottomNavigationBar: SafeArea(
                top: false,
                child: Padding(
                  padding: const EdgeInsets.symmetric(horizontal: 16.0),
                  child: Row(
                    mainAxisAlignment: MainAxisAlignment.spaceBetween,
                    children: [
                      IconButton(
                        icon: const Icon(
                          Icons.chevron_left_rounded,
                        ),
                        onPressed: _onTapPrevious,
                      ),
                      IconButton(
                        icon: const Icon(
                          Icons.chevron_right_rounded,
                        ),
                        onPressed: _onTapNext,
                      ),
                    ],
                  ),
                ),
              ),
            ),
          )
          .toList(),
    );
  }
}

class AppBody {
  final String title;
  final Widget widget;
  AppBody(
    this.title,
    this.widget,
  );
}

final listOfAnimations = <AppBody>[
  AppBody(
    'Watery Desert',
    const Text(
      'Total animations: 20',
      textAlign: TextAlign.center,
      style: TextStyle(
        fontSize: 18,
      ),
    ),
  ),
  AppBody(
    'waveDots',
    LoadingAnimationWidget.waveDots(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'inkDrop',
    LoadingAnimationWidget.inkDrop(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'twistingDots',
    LoadingAnimationWidget.twistingDots(
      leftDotColor: const Color(0xFF1A1A3F),
      rightDotColor: const Color(0xFFEA3799),
      size: _kSize,
    ),
  ),
  AppBody(
    'threeRotatingDots',
    LoadingAnimationWidget.threeRotatingDots(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'staggeredDotsWave',
    LoadingAnimationWidget.staggeredDotsWave(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'fourRotatingDots',
    LoadingAnimationWidget.fourRotatingDots(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'fallingDot',
    LoadingAnimationWidget.fallingDot(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'prograssiveDots',
    LoadingAnimationWidget.prograssiveDots(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'discreteCircle',
    LoadingAnimationWidget.discreteCircle(
        color: Colors.white,
        size: _kSize,
        secondRingColor: Colors.black,
        thirdRingColor: Colors.purple),
  ),
  AppBody(
    'threeArchedCircle',
    LoadingAnimationWidget.threeArchedCircle(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'bouncingBall',
    LoadingAnimationWidget.bouncingBall(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'flickr',
    LoadingAnimationWidget.flickr(
      leftDotColor: const Color(0xFF0063DC),
      rightDotColor: const Color(0xFFFF0084),
      size: _kSize,
    ),
  ),
  AppBody(
    'hexagonDots',
    LoadingAnimationWidget.hexagonDots(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'beat',
    LoadingAnimationWidget.beat(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'twoRotatingArc',
    LoadingAnimationWidget.twoRotatingArc(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'horizontalRotatingDots',
    LoadingAnimationWidget.horizontalRotatingDots(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'newtonCradle',
    LoadingAnimationWidget.newtonCradle(
      color: Colors.white,
      size: 2 * _kSize,
    ),
  ),
  AppBody(
    'stretchedDots',
    LoadingAnimationWidget.stretchedDots(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'halfTriangleDot',
    LoadingAnimationWidget.halfTriangleDot(
      color: Colors.white,
      size: _kSize,
    ),
  ),
  AppBody(
    'dotsTriangle',
    LoadingAnimationWidget.dotsTriangle(
      color: Colors.white,
      size: _kSize,
    ),
  ),
];