Bottom Bar Animation In Flutter

Bottom Bar Animation In Flutter

Screenshot :

active_tab.dart

import 'package:flutter/material.dart';

class ActiveTab extends AnimatedWidget {
  final IconData iconData;
  final String text;

  ActiveTab({Key key, Animation animation, this.iconData, this.text})
      : super(key: key, listenable: animation);

  @override
  Widget build(BuildContext context) {
    final Animation<double> animation = listenable;

    return Transform(
        transform: Matrix4.diagonal3Values(animation.value, 1, 1),
        child: Container(
            width: 100.0,
            height: 60.0,
            decoration: BoxDecoration(
                color: Colors.orange,
                borderRadius: BorderRadius.only(
                    topLeft: Radius.circular(20.0),
                    bottomLeft: Radius.circular(20.0),
                    bottomRight: Radius.circular(20.0))),
            child: Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Icon(iconData, color: Colors.white, size: 25),
                  Text(text,
                      style: TextStyle(color: Colors.white, fontSize: 14))
                ])));
  }
}

bottom_bar.dart

import 'package:flutter/material.dart';

import 'active_tab.dart';

class BottomBar extends StatefulWidget {
  @override
  BottomBarState createState() => BottomBarState();
}

class BottomBarState extends State<BottomBar>
    with SingleTickerProviderStateMixin {
  Animation animation;
  AnimationController animationController;
  int currentTab = 0;

  @override
  void initState() {
    super.initState();

    animationController =
        AnimationController(vsync: this, duration: Duration(seconds: 1));

    animation = Tween(begin: 0.0, end: 1.0).animate(
        CurvedAnimation(parent: animationController, curve: Curves.elasticOut));

    animationController.forward();
  }

  @override
  Widget build(BuildContext context) {
    return Container(
        height: 60,
        width: MediaQuery.of(context).size.width,
        padding: EdgeInsets.only(right: 16, bottom: 5, top: 10, left: 16),
        child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: <Widget>[
              _buildTab("Hotels", Icons.hotel, 0),
              _buildTab("Favorites", Icons.favorite, 1),
              _buildTab("Map", Icons.map, 2)
            ]));
  }

  Widget _buildTab(String text, IconData icon, int index) {
    return currentTab == index
        ? ActiveTab(
            animation: animation, key: Key(text), text: text, iconData: icon)
        : Material(
            child: InkWell(
                onTap: () {
                  setState(() {
                    currentTab = index;
                    animationController.reset();
                    animationController.forward();
                  });
                },
                child: Icon(icon, size: 25)));
  }

  @override
  void dispose() {
    animationController.dispose();
    super.dispose();
  }
}

home_page.dart

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

class HomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SafeArea(
        child: Scaffold(bottomNavigationBar: BottomBar(), body: Container()));
  }
}

main.dart

import 'package:flutter/material.dart';
import 'package:hotelbooking/home_page.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        debugShowCheckedModeBanner: false,
        title: 'Bottom Bar Animation',
        theme: ThemeData(
            primarySwatch: Colors.blue,
            primaryColor: Colors.blueAccent,
            accentColor: Colors.blue,
            fontFamily: 'avenir',
            cardColor: Colors.white),
        home: HomePage());
  }
}

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