Issue
I am building a quiz app and I created a custom widget to save me a lot of time as I have a lot of questions for the quiz. Everything works apart from the scoring system. If I create multiple instances of the same widget the score will not be incremented and it will stay on 1. Is there any way I can pass each score of the widgets to a global variable in my main widget so then I can add all the scores? (I’m new to flutter).
Custom Widget
class Questions extends StatefulWidget {
final String imagePath;
final String question;
final String answer1;
final String answer2;
final String answer3;
final String answer4;
final bool iscorrectAnswer1;
final bool iscorrectAnswer2;
final bool iscorrectAnswer3;
final bool iscorrectAnswer4;
int score = 0;
bool questionsAnswered = false;
Questions(
this.imagePath,
this.question,
this.answer1,
this.answer2,
this.answer3,
this.answer4,
this.iscorrectAnswer1,
this.iscorrectAnswer2,
this.iscorrectAnswer3,
this.iscorrectAnswer4,
);
@override
_QuestionsState createState() => _QuestionsState();
}
class _QuestionsState extends State<Questions> {
disableButton() {
setState(() {
widget.questionsAnswered = true;
Quiz().score += widget.score;
});
}
@override
@override
Widget build(BuildContext context) {
return Column(
children: [
SizedBox(
width: 600,
height: 600,
child: Image.asset(widget.imagePath),
),
Align(
alignment: Alignment.topCenter,
child: Padding(
padding: EdgeInsets.only(
top: 20,
),
child: Text(
widget.question,
style: TextStyle(
color: Colors.white,
fontSize: 38,
),
),
)),
Padding(
padding: EdgeInsets.only(
top: 40,
),
child: SizedBox(
width: 500,
height: 60,
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(15)),
child: ElevatedButton(
style: ButtonStyle(
backgroundColor: MaterialStateProperty.all(
Color(0xFF304e60),
),
),
child: Text(
widget.answer1,
style: TextStyle(
color: Colors.white,
fontSize: 15,
),
),
onPressed: widget.questionsAnswered == false
? () {
setState(() {
if (widget.iscorrectAnswer1 == true) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Correct!'),
),
);
disableButton();
widget.score += 1;
} else {
ScaffoldMessenger.of(context)
.showSnackBar(SnackBar(
content: Text('Wrong Answer!'),
));
}
});
print(widget.iscorrectAnswer1);
print(widget.score);
}
: null),
),
)),
Padding(
padding: EdgeInsets.only(
top: 10,
),
child: SizedBox(
width: 500,
height: 60,
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(15)),
child: ElevatedButton(
style: ButtonStyle(
backgroundColor:
MaterialStateProperty.all(Color(0xFF565462))),
child: Text(
widget.answer2,
style: TextStyle(
color: Colors.white,
fontSize: 15,
),
),
onPressed: widget.questionsAnswered == false
? () {
setState(() {
if (widget.iscorrectAnswer2 == true) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Correct!'),
),
);
widget.score += 1;
} else {
disableButton();
ScaffoldMessenger.of(context)
.showSnackBar(SnackBar(
content: Text('Wrong Answer!'),
));
}
});
}
: null),
),
)),
Padding(
padding: EdgeInsets.only(
top: 10,
),
child: SizedBox(
width: 500,
height: 60,
child: ClipRRect(
borderRadius: BorderRadius.all(Radius.circular(15)),
child: ElevatedButton(
style: ButtonStyle(
backgroundColor:
MaterialStateProperty.all(Color(0xFF84693b))),
child: Text(
widget.answer3,
style: TextStyle(
color: Colors.white,
fontSize: 15,
),
),
onPressed: widget.questionsAnswered == false
? () {
setState(() {
if (widget.iscorrectAnswer3 == true) {
ScaffoldMessenger.of(context).showSnackBar(
SnackBar(
content: Text('Correct!'),
),
);
widget.score += 1;
} else {
disableButton();
ScaffoldMessenger.of(context)
.showSnackBar(SnackBar(
content: Text('Wrong Answer!'),
));
}
});
}
: null),
),
),
)
],
);
}
}
Main widget where I call this custom widget
class Quiz extends StatefulWidget {
Quiz({Key? key}) : super(key: key);
int score = 0;
@override
_QuizState createState() => _QuizState();
}
class _QuizState extends State<Quiz> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('CyberQuiz'),
),
body: SingleChildScrollView(
scrollDirection: Axis.vertical,
child: Column(
children: [
Questions(
'images/malware_quiz.jpeg',
'1. What is a malware?',
'Designed to damage computers, servers or any other devices',
"Used to get user's credentials",
"It's used to destroy networks",
'',
true,
false,
false,
false,
),
],
)));
}
}
Solution
As you suggest in your question, you could create a global variable and increment/decrease/reset that.
Basic example code:
import 'package:flutter/material.dart';
class Score {
static int score = 0;
}
class ScoreCounter extends StatefulWidget {
const ScoreCounter({Key? key}) : super(key: key);
@override
State<ScoreCounter> createState() => _ScoreCounterState();
}
class _ScoreCounterState extends State<ScoreCounter> {
@override
Widget build(BuildContext context) {
return Column(
crossAxisAlignment: CrossAxisAlignment.stretch,
children: [
Expanded(
child: ElevatedButton(
onPressed: () {
setState(() {
Score.score++;
});
},
child: Text('increase score'),
),
),
Expanded(child: Text(Score.score.toString()))
],
);
}
}
Another option is to use the Provider package – link here which has an example
Answered By – Kdon
Answer Checked By – Cary Denson (FlutterFixes Admin)