I have a dart page voterhome(like dashboard),at first when I arrive at voterhome it will call the getuserdetails() function and get the adhar of user to pass it to other pages so I can navigate to other pages (like vote,voteregister ..etc)
when I return back to voterhome from other pages it will call the getuserdetails()function again because the function is inside initstate() I don't want this to happen how can I do that
my code :
voterhome.dart
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:election/services/IntoLogin.dart';
import 'package:election/pages/Voter/Vote.dart';
import 'package:election/pages/Voter/VoteRegister.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:http/http.dart';
import 'package:web3dart/web3dart.dart';
import '../../services/Auth.dart';
import '../../utils/Constants.dart';
import '../../services/Electioninfo.dart';
import '../../services/VerifyEmail.dart';
class VoterHome extends StatefulWidget {
//getting required parameters to pass on to vote and authorize
final Web3Client ethClient;
final String electionName;
final String electionaddress;
const VoterHome({Key? key, required this.ethClient, required this.electionName, required this.electionaddress}) : super(key: key);
@override
State<VoterHome> createState() => _VoterHomeState();
}
class _VoterHomeState extends State<VoterHome> {
//creating clients
late Client? httpClient;//http client
late Web3Client? ethclient;// eth client
//sign out user
final User? user = Auth().currentuser;
Future<void>signOut()async{
await Auth().signOut();
if(!mounted)return;
Navigator.pushAndRemoveUntil(context, MaterialPageRoute(builder: (context)=>IntroLogin()), (route) => false);
}
// voters info
var email;
var adhar;
var name;
var phone;
//checking if voter authorized or voted // dont have to do this because we does this on the respected pages
late bool isAuth = false;//if he is authorized
late bool isVoted = false;//if he is voted
Future<void>getUserDetail() async {
try {
final DocumentSnapshot voters = await FirebaseFirestore.instance
.collection('voters')
.doc(user?.email)
.get();
if (voters.data() != null) {
email = voters.get('email');
name = voters.get('name');
phone = voters.get('phone');
adhar = voters.get('adharnum');
print('adhar is $adhar');
}else{
print('cannot find details');
}
showSnackBar(succesdetailsnackSnack);
} catch (e) {
if (kDebugMode) {
print('get check user ::::: $e');
showSnackBar(errordetailsnackSnack);
}
}
}//function to check ends
@override
void initState() {
httpClient = Client();
ethclient = Web3Client(infura_url, httpClient!);
WidgetsBinding.instance.addPostFrameCallback((_) async {
await getUserDetail();
setState(() { });
});
super.initState();
}
@override
Widget build(BuildContext context) {
Map<String,dynamic> voterdata = {'name':name,'adharnum':adhar.toString(),'email':email,};
if(user!.emailVerified){
return Scaffold(
appBar: AppBar(
leading: IconButton(onPressed: () { signOut(); }, icon: const Icon(Icons.logout),),
actions: [IconButton(onPressed:(){setState(() {});}, icon: const Icon(Icons.refresh))],
title: const Text('Voter DASHBOARD'),backgroundColor: Colors.cyan,),
body: SingleChildScrollView(
child: Column(
children: [
Container(
padding: const EdgeInsets.all(24),
margin: const EdgeInsets.only(bottom: 16),
child: InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => VoteRegister(electionName:widget.electionName,
ethClient: widget.ethClient, electionaddress:widget.electionaddress,adhar:adhar,)));
},
child: Card(borderOnForeground: true,elevation: 4,
child: Column(
children: [
Container(height: 200,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(15),
image: const DecorationImage(
image: AssetImage('assets/undraw/electionday.png')))),
Container(decoration: const BoxDecoration(color: Colors.cyan),width: double.infinity,
child: const Center(
child: Text('Register to Vote',style: TextStyle(
fontWeight: FontWeight.bold,fontSize:16,color: Colors.white),),
),
)
],
),
),
),
),
Container(
padding: const EdgeInsets.all(24),
margin: const EdgeInsets.only(bottom: 16),
child: InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => VoterVote(ethClient:ethclient!,electionName:widget.electionName,
electionaddress:widget.electionaddress ,votermap:voterdata,)));
},
child: Card(borderOnForeground: true,elevation: 4,
child: Column(
children: [
Container(height: 200,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(15),
image: const DecorationImage(
image: AssetImage('assets/undraw/upvote.png')))),
Container(decoration: const BoxDecoration(color: Colors.cyan),width: double.infinity,
child: const Center(
child: Text('Vote',style: TextStyle(fontWeight: FontWeight.bold,fontSize:16,color: Colors.white),),
),
)
],
),
),
),
),
Container(
padding: const EdgeInsets.all(24),
margin: const EdgeInsets.only(bottom: 16),
child: InkWell(
onTap: () {
Navigator.push(
context,
MaterialPageRoute(
builder: (context) => ElectionInfo(ethClient:ethclient!,electionName:widget.electionName,
electionAddress:widget.electionaddress,)));
},
child: Card(borderOnForeground: true,elevation: 4,
child: Column(
children: [
Container(height: 200,
decoration: BoxDecoration(
borderRadius: BorderRadius.circular(15),
image: const DecorationImage(
image: AssetImage('assets/undraw/electionday.png')))),
Container(decoration: const BoxDecoration(color: Colors.cyan),width: double.infinity,
child: const Center(
child: Text('Election details',style: TextStyle(
fontWeight: FontWeight.bold,fontSize:16,color: Colors.white),),
),
)
],
),
),
),
),
],
),
)
);
}else{
return Scaffold(
appBar:AppBar( ///app bar
backgroundColor: Colors.cyan,
leading: IconButton(
onPressed: () {
signOut();
},
icon: const Icon(Icons.logout_sharp),
),
title: const Text('Verify Voter email'),
actions: [
IconButton(
onPressed: () {
refresh();
},
icon: const Icon(Icons.refresh))
],
),
body: Container(margin: const EdgeInsets.only(top: 56),
child: Center(
child: Column(
children: [
Text('Your Email ${user?.email} is not verified'),
const SizedBox(height: 24,),
ElevatedButton(
onPressed: () {
Navigator.pushAndRemoveUntil(
context,
MaterialPageRoute(builder: (context) => const VerifyEmail()),
(route) => false);
},
child: const Text('Verify Email'))
],
),
),
),
);
}
}
//function to refresh using setstate
void refresh() {
setState(() {});
}
//snackbar
SnackBar errordetailsnackSnack = const SnackBar(content: Text('You are not logged in if you are please check your internet connection'));
SnackBar succesdetailsnackSnack = const SnackBar(content: Text('successfull'));
SnackBar votedSnack = const SnackBar(content: Text('You have already voted'));
SnackBar RegisterSnack = const SnackBar(content: Text('You have already registered'));
// SnackBar errorSnack = const SnackBar(content: Text('Fill all the details'));
// SnackBar datanullSnack = const SnackBar(content: Text('No users registerd yet'));
//function to show snackbar
ScaffoldFeatureController<SnackBar, SnackBarClosedReason> showSnackBar(SnackBar snackBar) {
return ScaffoldMessenger.of(context).showSnackBar(snackBar);
}
}
vote.dart //when i go to voterhome() from this it again calls the function
import 'package:cloud_firestore/cloud_firestore.dart';
import 'package:election/pages/Voter/VoterHome.dart';
import 'package:election/utils/Constants.dart';
import 'package:firebase_auth/firebase_auth.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:web3dart/web3dart.dart';
import '../../services/Auth.dart';
import '../../services/functions.dart';
import '../../services/IntoLogin.dart';
class VoterVote extends StatefulWidget {
final Web3Client ethClient;
final String electionName;
final String electionaddress;
final votermap;
const VoterVote({Key? key, required this.ethClient, required this.electionName, required this.electionaddress, this.votermap,}) : super(key: key);
@override
State<VoterVote> createState() => _VoterVoteState();
}
class _VoterVoteState extends State<VoterVote> {
final User? user = Auth().currentuser;//fi// rebase auth current user initialization
//sign out user function
Future<void> signOut() async {
if (!mounted) return;
await Auth().signOut();
if (!mounted) return;
Navigator.pushAndRemoveUntil(
context,
MaterialPageRoute(builder: (context) => IntroLogin()),
(route) => false);
}
//checking if the voter is already voted
late bool isAuth = false;
late bool isVoted = false;
Future<void>getUserDetail() async {
var voterdetails = widget.votermap;
try {
final DocumentSnapshot voters = await FirebaseFirestore.instance
.collection('Election')
.doc(widget.electionName).collection('voterAuth').doc(voterdetails['adharnum'])
.get();
if (voters.data() != null) {
isAuth = voters.get('isAuth');
isVoted = voters.get('isVoted');
}else{
isAuth = false;
isVoted= false;
print('cannot find details');
}
} catch (e) {
if (kDebugMode) {
print('get check user ::::: $e');
}
}
}//function to check ends
TextEditingController privatekeyController = TextEditingController();
@override
void initState() {
WidgetsBinding.instance.addPostFrameCallback((_) async {
await getUserDetail();
setState(() { });
});
super.initState();
}
@override
Widget build(BuildContext context) {
if(isVoted== true && isAuth == true){
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.cyan,
leading: IconButton(onPressed: (){signOut();},icon: const Icon(Icons.logout_sharp),),
title:const Text('Vote'),
actions: [
IconButton(onPressed:(){
refresh();
}, icon: const Icon(Icons.refresh))
],
),
body: const Center(child: Text('you have already voted sir'),),
);
}else if(isVoted == false&&isAuth == true){
return Scaffold(
appBar:AppBar(
backgroundColor: Colors.cyan,
leading: IconButton(onPressed: (){signOut();},icon: const Icon(Icons.logout_sharp),),
title:const Text('Vote'),
actions: [
IconButton(onPressed:(){
refresh();
}, icon: const Icon(Icons.refresh))
],
),
body: Container(margin:const EdgeInsets.only(bottom: 56,top: 24),alignment: Alignment.topCenter,
child:SingleChildScrollView(
child: Column(
children: [
Center(
child: SelectableText("$voter_private_key && $voter_key2 && $voter_key3")
),
const SizedBox(height: 24,),
Container(padding: const EdgeInsets.all(16),
child: TextField(
controller: privatekeyController,
decoration:
const InputDecoration(hintText: 'Private key for voting',border: OutlineInputBorder(
borderRadius:
BorderRadius.all(Radius.circular(8))))),
),
const SizedBox(height: 24,),
SingleChildScrollView(
child: StreamBuilder<List>(stream:getCandidatesNum(widget.ethClient,widget.electionaddress).asStream(),
builder: (context, snapshot) {
if (snapshot.connectionState == ConnectionState.waiting) {
return const Center(
child: CircularProgressIndicator(),
);
} else {
return Column(
children: [
for (int i = 0; i < snapshot.data![0].toInt(); i++)
FutureBuilder<List>(
future: candidateInfo(i, widget.ethClient,widget.electionaddress),
builder: (context, candidatesnapshot) {
if (candidatesnapshot.connectionState ==
ConnectionState.waiting) {
return const Center(
child: CircularProgressIndicator(),
);
} else {
return Card( //card to represent the candidate
color: Colors.cyan,
child: SizedBox(height: 100,
child: Center(
child: ListTile(
title: Text('Name: ${candidatesnapshot.data![0][0]}'),
subtitle: Text('Votes: ${candidatesnapshot.data![0][1]}'),
leading: ConstrainedBox(
constraints: const BoxConstraints(
minHeight: 90,
minWidth: 90,
maxHeight: 100,
maxWidth: 100,
),
child:const Image(image: AssetImage('assets/undraw/electionday.png')),
),
trailing: ElevatedButton(
onPressed: ()async {
try{
await vote(i,widget.ethClient,privatekeyController.text,widget.electionaddress);
await registerAuth();
gotoDashboard();
showSnackBar(succesdetailsnackSnack);
}catch(e){
if (kDebugMode) {
print(e);
}
showSnackBar(errordetailsnackSnack);
gotoDashboard();
}
}, child: const Text('Vote'),),
),
),
),
);
}
})
],
);
}
},
),
),
],
),
),
),
);
}else{
return Scaffold(
appBar: AppBar(
backgroundColor: Colors.cyan,
leading: IconButton(onPressed: (){signOut();},icon: const Icon(Icons.logout_sharp),),
title:const Text('Vote'),
actions: [
IconButton(onPressed:(){
refresh();
}, icon: const Icon(Icons.refresh))
],
),
body: const Center(child: Text('you are not authorized please authorize first'),),
);
}
}
//snackbar
SnackBar errordetailsnackSnack = const SnackBar(content: Text(' already voted or please check your internet connection'));
SnackBar succesdetailsnackSnack = const SnackBar(content: Text('successfull'));
SnackBar voterSnack = const SnackBar(content: Text('you are a voter logout from voter account'));
SnackBar adminSnack = const SnackBar(content: Text('you are an admin logout from Admin account'));
// SnackBar errorSnack = const SnackBar(content: Text('Fill all the details'));
// SnackBar datanullSnack = const SnackBar(content: Text('No users registerd yet'));
//function to show snackbar
ScaffoldFeatureController<SnackBar, SnackBarClosedReason> showSnackBar(SnackBar snackBar) {
return ScaffoldMessenger.of(context).showSnackBar(snackBar);
}
void refresh() {
setState(() {});
}
Future<void> registerAuth() async {
var voterdetails = widget.votermap;
try {
await FirebaseFirestore.instance.collection('Election').doc(widget.electionName).collection('voterAuth').doc(voterdetails['adharnum']).update({'isVoted':true});
print('updated data aaaaaaaaaaaaaaa');
} catch (e) {
if (kDebugMode) {
print('failed to register on firebase $e');
}
}
}
void gotoDashboard(){
Navigator.pushAndRemoveUntil(context,MaterialPageRoute(builder:(context)=>VoterHome(ethClient: widget.ethClient,
electionName: widget.electionName, electionaddress: widget.electionaddress)), (route) => false);
}
}
One way to achieve what you want is by making your page retain its state.
Try this code
with AutomaticKeepAliveClientMixin to the screen like in the snippet below.@override bool get wantKeepAlive => true;.super.build(context);.class _TestScreen extends State<TestScreen> with AutomaticKeepAliveClientMixin<TestScreen> {
@override
bool get wantKeepAlive => true;
Widget build(BuildContext context) {
super.build(context);
return Scaffold();
}
}
After doing this, your page will not call initState() everytime that page is loaded.