flutter_bouncy 1.0.1 copy "flutter_bouncy: ^1.0.1" to clipboard
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Scrolling with bouncy and natural item movement

example/lib/main.dart

import 'dart:async';
import 'dart:math';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/physics.dart';
import 'package:flutter/rendering.dart';
import 'package:flutter_bouncy/flutter_bouncy.dart';

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

class MyApp extends StatelessWidget {
  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  MyHomePage({Key key, this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

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

class _MyHomePageState extends State<MyHomePage>
    with SingleTickerProviderStateMixin {
  int _counter = 0;
  final tween = Tween<double>(begin: 0.0, end: 0.0);
  ScrollController scrollController;
  Offset globalPosition;
  double lastPixels;

  @override
  void initState() {
    scrollController = ScrollController();
    super.initState();
  }

  void _incrementCounter() {
    setState(() {
      // This call to setState tells the Flutter framework that something has
      // changed in this State, which causes it to rerun the build method below
      // so that the display can reflect the updated values. If we changed
      // _counter without calling setState(), then the build method would not be
      // called again, and so nothing would appear to happen.
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    final children = [
      // _buildBar(5),
      // _buildBar(3),
      // _buildBar(3),
      // _buildBar(3),
      // _buildBar(4),
      // _buildBar(5),
      // _buildBar(1),
      // _buildBar(4),
      // _buildBar(6),
      // _buildBar(3),
      // _buildBar(2.1),
      // _buildBar(6),
      // _buildBar(3),
      // _buildBar(3),
      // _buildBar(4),
      // _buildBar(3),
      // _buildBar(3),
      // _buildBar(1.5),
      // _buildBar(3),
      // _buildBar(5),
      // _buildBar(6),
      // _buildBar(3),
      // _buildBar(4),
      // _buildBar(6),
      // _buildBar(2),
      // _buildBar(3),
      // _buildBar(1.5),
      // _buildBar(3),
      // _buildBar(5),
      // _buildBar(4),
      // _buildBar(3),
      // _buildBar(4),
      // _buildBar(6),
      // _buildBar(2),
      // _buildBar(3),
      // _buildBar(3),
      // _buildBar(3),
      // _buildBar(4),
      // _buildBar(5),
      // _buildBar(1),
      // _buildBar(4),
      // _buildBar(6),
      // _buildBar(3),
      // _buildBar(3),
      // _buildBar(3),
      // _buildBar(4),
      // _buildBar(5),
      // _buildBar(1),
      // _buildBar(4),
      // _buildBar(6),
      _buildChatMessage(true),
      _buildChatMessage(false),
      _buildChatMessage(true),
      _buildChatMessage(true),
      _buildChatMessage(true),
      _buildChatMessage(false),
      _buildChatMessage(false),
      _buildChatMessage(true),
      _buildChatMessage(false),
      _buildChatMessage(true),
      _buildChatMessage(true),
      _buildChatMessage(false),
      _buildChatMessage(false),
      _buildChatMessage(true),
      _buildChatMessage(true),
      _buildChatMessage(true),
      _buildChatMessage(false),
      _buildChatMessage(true),
      _buildChatMessage(true),
      _buildChatMessage(true),
      _buildChatMessage(false),
      _buildChatMessage(false),
      _buildChatMessage(true),
      _buildChatMessage(false),
      _buildChatMessage(true),
      _buildChatMessage(true),
      _buildChatMessage(false),
      _buildChatMessage(true),
      _buildChatMessage(true),
      _buildChatMessage(false),
      _buildChatMessage(true),
      _buildChatMessage(true),
    ];
    return Scaffold(
      body: SafeArea(
        child: Padding(
          padding: EdgeInsets.all(10),
          child: AnimatedBouncyList(
            reverse: true,
            itemBuilder: (ctx, i, anim) {
              return children[i];
            },
            initialItemCount: children.length,
          ),
        ),
      ),
    );
  }

  Widget _buildChatMessage(bool isSender) {
    return Padding(
      padding: EdgeInsets.symmetric(vertical: 10),
      child: Align(
        alignment: isSender ? Alignment.centerRight : Alignment.centerLeft,
        child: FractionallySizedBox(
          widthFactor: 0.8,
          child: Container(
            height: 25,
            decoration: BoxDecoration(
              color: isSender
                  ? Colors.purple.withOpacity(0.8)
                  : Colors.grey.withOpacity(0.4),
              borderRadius: BorderRadius.circular(10),
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildBar(double height) {
    return Padding(
      padding: EdgeInsets.symmetric(horizontal: 5),
      child: Align(
        alignment: Alignment.bottomCenter,
        child: FractionallySizedBox(
          heightFactor: height / 9,
          child: Container(
            width: 18,
            decoration: BoxDecoration(
              color: Colors.green.withOpacity(max(Random().nextDouble(), 0.4)),
              borderRadius: BorderRadius.circular(10),
            ),
          ),
        ),
      ),
    );
  }
}
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Scrolling with bouncy and natural item movement

Repository (GitHub)
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License

MIT (LICENSE)

Dependencies

flutter

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