Shopping Cart Counter Box In Flutter :
This flutter tutorial post is shopping cart counter box. That is common counter box. Most of online shopping application avilable you can more than one items is shopping. This widget is common in shopping application. By default shopping item 0.
Screenshot :

CountButtonView.dart
/* Container( height: 200, child: Stack( fit: StackFit.expand, alignment: Alignment.center, children: <Widget>[ Image.network( 'http://c.hiphotos.baidu.com/baike/s%3D235/sign=4e9e519417950a7b713549c73fd0625c/6a600c338744ebf818da6e9dd3f9d72a6159a7ec.jpg', fit: BoxFit.cover, ), Positioned( right: 8.0, bottom: 8.0, child: CountButtonView( initialCount: 0, onChange: (count) { }, )), ], )); */ import 'package:flutter/material.dart'; typedef void CountButtonClickCallBack(int count); class CountButtonView extends StatefulWidget { final int initialCount; final CountButtonClickCallBack onChange; CountButtonView({this.initialCount, this.onChange}); @override _CountButtonViewState createState() => _CountButtonViewState(); } class _CountButtonViewState extends State<CountButtonView> { int count; @override void initState() { super.initState(); count = widget.initialCount; } @override void dispose() { super.dispose(); } void updateCount(int addValue) { if (count + addValue >= 0) { setState(() { count += addValue; }); if (widget.onChange != null) { widget.onChange(count); } } } @override Widget build(BuildContext context) { return SizedBox( width: 110.0, height: 44.0, child: Center( child: Container( decoration: BoxDecoration( color: Color(0xddFFFFFF), border: Border.all(color: Colors.orange, width: 1.0), borderRadius: BorderRadius.circular(22.0)), child: Row( mainAxisAlignment: MainAxisAlignment.spaceBetween, children: <Widget>[ GestureDetector( onTap: () { updateCount(-1); }, child: Container( width: 40.0, child: Center( child: Text( '-', style: TextStyle( fontSize: 25.0, fontWeight: FontWeight.bold, color: Colors.orange, decoration: TextDecoration.none), )))), Container( child: Center( child: Text( '$count', style: TextStyle( fontSize: 20.0, fontWeight: FontWeight.bold, color: Colors.orange, decoration: TextDecoration.none), )), ), GestureDetector( onTap: () { updateCount(1); }, child: Container( width: 40.0, child: Center( child: Text( '+', style: TextStyle( fontSize: 25.0, fontWeight: FontWeight.bold, color: Colors.orange, decoration: TextDecoration.none), )))), ], ), ), ), ); } }
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