Fancybar In Flutter

Fancybar In Flutter :

Fancybar In Flutter :today i will show you how to create beautiful fancybar in flutter.this is a fancy and animated widget for the flutter app

in this app we can add some costomization option like

items : items that appear in the bottom.it require more than one item and less than six item that means you can add maximum six item in the bar

in this flutter tutorial i am adding four item in the bottombar

selectIndex :it return the current item. index.use it to change the selected item. default value is zero

title : the title is display after the item is selected. you can see in this example when i press the home icon the title of home is displayed

Dependencies :

dependencies:
fancy_bar: ^1.0.0

the final output for the fancybar in flutter and the code is given below.you can use following links to know more about flutter

Ui Design In Flutter

BottomNavigationBar using TabBarView with UnderLine :

Screenshot :

fancy_bar.dart

library fancy_bar;
import 'package:flutter/material.dart';

class FancyBottomBar extends StatefulWidget {
  final List<FancyItem> items;
  final selectedIndex;
  final ValueChanged<int> onItemSelected;

  FancyBottomBar({
    this.items,
    this.selectedIndex,
    @required this.onItemSelected,
  }) {
    assert(items != null);
    assert(items.length >= 2 && items.length <= 4);
    assert(onItemSelected != null);
  }

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

class _FancyBottomBarState extends State<FancyBottomBar> {
  int pos = 0;

  void setItem(int _pos) {
    setState(() {
      pos = _pos;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Material(
      child: BottomAppBar(
//        shape: CircularNotchedRectangle(),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: widget.items.map((_item) {
            FancyItem item = _item;
            var index = widget.items.indexOf(_item);
            return InkWell(
              onTap: () {
                setItem(index);
                widget.onItemSelected(index);
              },
              child: _ItemVWidget(
                item: item,
                isSelected: index == pos,
                length: widget.items.length,
              ),
            );
          }).toList(),
        ),
      ),
    );
  }
}

class _ItemVWidget extends StatelessWidget {
  final FancyItem item;
  final bool isSelected;
  final int length;

  const _ItemVWidget({Key key, this.item, this.isSelected, this.length})
      : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
        width: MediaQuery.of(context).size.width / length,
        height: kBottomNavigationBarHeight,
        alignment: Alignment.center,
        child: AnimatedSwitcher(
          transitionBuilder: (Widget child, Animation<double> animation) {
            return ScaleTransition(
              scale: animation,
              child: child,
            );
          },
          duration: Duration(milliseconds: 250),
          child: isSelected
              ? Text(
                  '${item.title}',
                  style: TextStyle(
                      color: item.textColor ?? Theme.of(context).primaryColor,
                      fontWeight: FontWeight.bold,
                      fontSize: 16),
                )
              : item.icon,
        ));
  }
}

class FancyItem {
  Color textColor;
  String title;
  Widget icon;

  FancyItem({
    @required this.textColor,
    @required this.title,
    @required this.icon,
  });
}

main.dart

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

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
      ),
      home: MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

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

  final String title;

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

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        // Here we take the value from the MyHomePage object that was created by
        // the App.build method, and use it to set our appbar title.
        title: Text(widget.title),
      ),
      bottomNavigationBar: FancyBottomBar(
        items: [
          FancyItem(
            textColor: Colors.orange,
            title: 'Home',
            icon: Icon(Icons.home),
          ),
          FancyItem(
            textColor: Colors.red,
            title: 'Trending',
            icon: Icon(Icons.trending_up),
          ),
          FancyItem(
            textColor: Colors.green,
            title: 'Search',
            icon: Icon(Icons.search),
          ),
          FancyItem(
            textColor: Colors.brown,
            title: 'Settings',
            icon: Icon(Icons.settings),
          ),
        ],
        onItemSelected: (index) {
          print(index);
        },
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            Text(
              'You have pushed the button this many times:',
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.display1,
            ),
          ],
        ),
      ),
      floatingActionButton: FloatingActionButton(
        onPressed: _incrementCounter,
        tooltip: 'Increment',
        child: Icon(Icons.add),
      ), // This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}

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