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Arslan Kaleem
Arslan Kaleem

Reputation: 1618

How to add timer in tasks after being triggered in flutter

I am working on a slider in flutter which is focused on rating. I want to add a timer to manage a rating time (i.e if the user rated then he/she can't rate again for an hour. Which means once the function is triggered it won't trigger again for a specific time).

So how is it possible to do that. I have a little knowledge about the Timer class and I don't how exactly it should be done. By doing this we are bounding the user not to rate as many times as user want

Upvotes: 1

Views: 440

Answers (1)

Rohan Thacker
Rohan Thacker

Reputation: 6347

A simple implementation using a Timer for the functionality you require is to store a bool and start the timer and toggle the bool value when the user performs the function and on timeout toggle the `bool to false and start the timer again.

Below is an example that uses setState.

import 'dart:async';
import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(home:TimerExample()));
}

class TimerExample extends StatefulWidget{
  @override
  State<StatefulWidget> createState() {
    return _TimerExampleState();
  }
}

class _TimerExampleState extends State<TimerExample> {
   // Using a short timer for testing, set a duration 
   // you can set a any duration you like, For Example:
   // Duration(hours: 1) | Duration(minutes: 30)
   final _timeoutDuration = Duration(seconds:3);
   late Timer _timer;
   bool _canVote = true;

   @override
   void dispose() {
     super.dispose();
     _timer.cancel();
   }

   void onTimeout() {
    setState(() => _canVote = true);
   }
  
   void startTimer() {
     setState(() {
       _canVote = false;
       _timer = Timer(_timeoutDuration, onTimeout);
     });
   }
  
   @override
   Widget build(BuildContext context) {
     return TextButton(
       onPressed: _canVote ? startTimer : null,
       child: Text('Vote')
     );
   }
}

Upvotes: 2

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