Shopping Cart Counter Box In Flutter

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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