问题描述
我让这个测试应用程序部分工作。它会更新百吉饼计数器，但会更新屏幕上的所有百吉饼计数器。我将 cubit build.provider 移至仅显示屏幕上每个项目计数的文本字段。
这修复了我对所有百吉饼数量的全局更新。所以每个人现在都维护自己的计数器。但是现在当我滚出屏幕时，计数都被重置了。我将 + 0 1 计数器作为一个类拉入列表视图中。
我曾尝试添加密钥和 addAutomaticKeepAlives：正确但没有运气。修复删除 + 之间计数器 0 的滚动 - 正在重置..
main.dart
//Todo Screen Layouts
//Todo json pull and post
//Todo where to send post to email sms for store to see
//Todo Update live db with fields add to test dp retailp and mobileactive
//Todo Create batch process to generate json file from db nightly or on demain via a button
//Todo TEST code
//Todo spining on load bagel icon or sprit - make.
//Todo total bagels / breads order
//Todo shopping card added
//Todo snackbar menu for as total add up pop up totals
import 'package:Flutter/material.dart';
import 'Services.dart';
import 'Product.dart';
import 'bagelcounter.dart';
import 'cubit/counter_state.dart';
import 'cubit/counter_cubit.dart';
import 'cubit/counter_cubit_page.dart';
import 'package:Flutter_bloc/Flutter_bloc.dart'; //addded
void main() => runApp(MyApp());
// #docregion MyApp
class MyApp extends StatelessWidget {
final bool keepAlive = true; // not working
// #docregion build
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Startup Name Generator',theme: ThemeData(
// Add the 3 lines from here...
primarySwatch: Colors.blue,textTheme: TextTheme(
headline1: TextStyle(
fontFamily: 'Corben',fontWeight: FontWeight.w700,fontSize: 24,color: Colors.black,),// ... to here.
home: buildJsonParseDemo(),// org home: buildJsonParseDemo(),);
}
JsonParseDemo buildJsonParseDemo() => JsonParseDemo();
// #enddocregion build
}
class JsonParseDemo extends StatefulWidget {
//
JsonParseDemo() : super();
@override
_JsonParseDemoState createState() => _JsonParseDemoState();
}
class _JsonParseDemoState extends State<JsonParseDemo> {
//
List<Product> _product;
bool _loading;
//quick fix make this getter
//static //todo make live counter
int mbakerdoz = 0;
//get bakerdoz => mbakerdoz;
//static //todo make live counter
int singles = 10;
@override
void initState() {
super.initState();
_loading = true;
Services.getUsers().then((product) {
setState(() {
_product = product;
_loading = false;
});
});
}
//Todo find day of week to only see items available on day:
//DateTime date = DateTime.Now();
//print("weekday is ${date.weekday}");
//Todo Add quantiy field of 1 - 6,default 0,to bagel and breads
//Todo Bottom total of item and price. Tax not included
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(_loading ? 'Loading...' : 'Bagels & Breads'),body: Container(
color: Colors.white,child: ListView.separated(
key: UniqueKey(),addAutomaticKeepAlives: true,//not working to sotp skroll delete
// key: UniqueKey(),key not fix update all.
separatorBuilder: (context,index) => Divider(
color: Colors.black,thickness: 2,itemCount: null == _product ? 0 : _product.length,itemBuilder: (context,index) {
Product product = _product[index];
return ListTile(
key: UniqueKey(),isThreeLine: true,// leading: Icon(Icons.plus_one),// trailing: Icon(Icons.exposure_minus_1),title: Text(product.pname,style: TextStyle(
color: Colors.blue[900],fontSize: 22.0,fontWeight: FontWeight.w500)),// product name
subtitle: Text(
'\$ ' +
(product.retailp.toStringAsFixed(2) +
' each index:' +
'$index ' +
' qty ' +
product.qty.toString()),key: UniqueKey(),style: TextStyle(
color: Colors.black,fontSize: 18.0,fontWeight: FontWeight.w400)
),trailing: SizedBox(
key: UniqueKey(),width: 150,child: BlocProvider<CounterCubit>(
key: UniqueKey(),create: (context) => CounterCubit(),child: CounterCubitPage(),)),);
},bottomNavigationBar: BottomAppBar(
child: Row(
children: [
//IconButton(icon: Icon(Icons.menu),onpressed: () {}),Spacer(),Container(
height: 55.0,width: 1.0,//Todo get bakerdoz and etotal on footer working need to pass data between main and bagelcounter
Text("Baker's Dozen: $mbakerdoz " + " Singles: $singles",style: TextStyle(
color: Colors.white,fontSize: 20.0,//IconButton(icon: Icon(Icons.search),//IconButton(icon: Icon(Icons.more_vert),],shape: CircularNotchedRectangle(),color: Colors.lightBlue,notchMargin: 8.0,//floatingActionButton:
// FloatingActionButton(child: Icon(Icons.add),//floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,);
}
}
counter_cubit_page.dart
import 'package:Flutter/material.dart';
import 'package:Flutter_bloc/Flutter_bloc.dart';
import 'counter_cubit.dart';
import 'counter_state.dart';
class CounterCubitPage extends StatelessWidget {
// static const String routeName = '/counter_cubit';
//@override
// bool get wantKeepAlive => true; // not work
// final bool keepAlive = true; // try to keep counter on skroll????
@override
Widget build(BuildContext context) => Scaffold(
key: UniqueKey(),//appBar: AppBar(title: const Text('Counter Cubit Bloc Double CTest')),body: BlocBuilder<CounterCubit,CounterCubitState>(
key: UniqueKey(),builder: (context,state) => Column(
children: [
Row(
key: UniqueKey(),mainAxisAlignment: MainAxisAlignment.center,children: [
IconButton(
icon: Icon(Icons.add_circle),color: Colors.blue,iconSize: 25,onpressed: () => context.read<CounterCubit>().increment(),Text(
'${state.totalbagels}',key: GlobalKey(),// not working
style: Theme.of(context).textTheme.headline4,IconButton(
icon: Icon(Icons.remove_circle),onpressed: () => context.read<CounterCubit>().decrement(),);
}
我曾尝试 addAutomaticKeepAlives: true 不起作用并尝试在字段上使用唯一键...
欢迎任何指点。我是 Flutter 编码的新手.. 还有很多东西要学..
解决方法
暂无找到可以解决该程序问题的有效方法，小编努力寻找整理中！
如果你已经找到好的解决方法，欢迎将解决方案带上本链接一起发送给小编。
小编邮箱:dio#foxmail.com (将#修改为@）