How to pass data between Widgets - flutter

Question

I've the below code where I fetch correctly data from url, display it in DataTable, and get the idext of the tapped row.
I need to use this index and display the related information on the back of the widget, I cam across TweenAnimationBuilder but not sure how to send data between the 2 faces, or if there is another way to do what I'm looking for:
import 'package:flutter/material.dart';
import 'dart:convert';
import 'dart:io';
import 'dart:async';
import 'package:csv/csv.dart';
void main() {
runApp(App());
}
class App extends StatelessWidget {
// This widget is the root of your application.
#override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.blue,
visualDensity: VisualDensity.adaptivePlatformDensity,
),
home: HomePage(title: 'Flutter Demo Home Page'),
);
}
}
class HomePage extends StatefulWidget {
HomePage({Key key, this.title}) : super(key: key);
final String title;
#override
_AppState createState() => _AppState();
}
Future<List<List<dynamic>>> fetchUserData() async {
final request = await HttpClient().getUrl(Uri.parse(
'https://docs.google.com/spreadsheets/d/e/2PACX-1vQvf9tp4-fETDJbC-HRmRKvVFAXEAGO4lrYPpVeiYkB6nqqXdSs3CjX0eBMvjIoEeX9_qU6K2RWmzVk/pub?gid=0&single=true&output=csv'));
final response = await request.close();
List<List<dynamic>> rowsAsListOfValues;
await for (final csvString in response.transform(const Utf8Decoder())) {
rowsAsListOfValues = const CsvToListConverter().convert(csvString);
}
return rowsAsListOfValues;
}
class _AppState extends State<HomePage> {
List<List<dynamic>> rowsAsListOfValues;
// ScrollController _controller;
#override
void didChangeDependencies() async {
super.didChangeDependencies();
rowsAsListOfValues = await fetchUserData();
super.setState(() {}); // to update widget data
}
#override
void initState() {
super.initState();
// _controller = ScrollController();
// _controller = new ScrollController()..addListener(_scrollListener);
}
/*
void _scrollListener() {
if (_controller.position.extentAfter <= 0.0 &&
_controller.offset >= _controller.position.maxScrollExtent &&
!_controller.position.outOfRange) {
print("call fetch method again");
}
} */
#override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
body: Center(
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
rowsAsListOfValues == null
? Text("Loading data...")
: Text(
'', // $rowsAsListOfValues
),
rowsAsListOfValues == null
? CircularProgressIndicator()
: DataTable(
showCheckboxColumn: false, // <-- this is important
columns: const <DataColumn>[
DataColumn(
label: Text(
'City',
style: TextStyle(fontStyle: FontStyle.italic),
),
),
DataColumn(
label: Text(
'Branches',
style: TextStyle(fontStyle: FontStyle.italic),
),
),
],
rows: List.generate(rowsAsListOfValues.length - 1, (index) {
return DataRow(
onSelectChanged: (bool selected) {
if (selected) {
print('index-selected: ${rowsAsListOfValues[index + 1][0]}');
}
},
cells: <DataCell>[
// DataCell(Text('${rowsAsListOfValues[index + 1][0]}')), // Index
DataCell(Text('${rowsAsListOfValues[index + 1][1]}')), // city
DataCell(Text('${rowsAsListOfValues[index + 1][2]}')), // branch
],
);
}),
),
],
),
),
);
}
}

Answer 1

May be you can use this https://pub.dev/packages/flippable_box flutter plugin which gives you options to define different view for front and back. You can use _isFlipped variable to maintain which side you want to display.
FlippableBox(
front: Data table for front view,
back: Display selected row,
isFlipped: _isFlipped,
)