Workers

main.dart

import 'package:flutter/material.dart';
import 'package:flutter_getx/my_controller.dart';
import 'package:flutter_getx/next_screen.dart';
import 'package:flutter_getx/student.dart';
import 'package:flutter_getx/unknown_route.dart';
import 'package:get/get.dart';
import 'home.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  MyController myController = Get.put(MyController());

  @override
  Widget build(BuildContext context) {
    // TODO: implement build
    return GetMaterialApp(
      title: "Workers",
      home: Scaffold(
        appBar: AppBar(title: Text("Workers")),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              RaisedButton(
                child: Text("Increment"),
                onPressed: () => myController.increment(),
              ),
              Padding(
                padding: EdgeInsets.all(16),
                child: TextField(
                  onChanged: (val) {
                    myController.increment();
                  },
                ),
              )
            ],
          ),
        ),
      ),
    );
  }
}

my_controller.dart

import 'package:flutter_getx/student.dart';
import 'package:get/get.dart';
import 'home.dart';
//Workers trigger specific callbacks when an event occurs.
class MyController extends GetxController {
  var count = 0.obs;
  void increment()
  {
    count++;
  }

  @override
  void onInit() {
    //called every time when the value of count variable changes
    //ever(count,(_)=>print(count));

    // Called every time when the value of any variable from the list changes
    //everAll([count], (_)=>print(count));

    // Called only once when the variable value changes
    //once(count, (_)=>print(count));

    //Called every time the user stops typing for 1 second
    //debounce(count, (_) => print("When the user stop typing for 1 sec the value of count will be $count"), time: Duration(seconds: 1));

    //Ignore all changes within 1 second.
    //imagine that the user can earn coins by clicking on something,
    // if he clicked 300 times in the same minute,
    // he would have 300 coins, using interval,
    // you you can set a time frame for 3 seconds,
    // and even then clicking 300 or a thousand times,
    // the maximum he would get in 1 minute would be 20 coins,
    // clicking 300 or 1 million times
    interval(count, (_) => print("Ignore all changes"), time: Duration(seconds: 1));
    super.onInit();
  }
}