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Flutter – How to listen variable change in getx and push new page?

I have a StatusManger which has a timer to count down:

class StatusManager extends GetxController {
  factory StatusManager() => _getInstance();
  static StatusManager? _instance;

  Timer? _timer;
  var count = 60.obs;

  static _getInstance() {
    if (_instance == null) {
      _instance = StatusManager._();
    }
    return _instance;
  }

  StatusManager._() {}

  @override
  void onInit() {
    super.onInit();
    debugPrint('onInit');
  }

  @override
  void onClose() {
    debugPrint('onClose');
    super.onClose();
  }

  startTimer() {
    stopTimer();

    _timer = Timer.periodic(Duration(seconds: 1), (Timer t) {
      fetchStatus();
    });
  }

  stopTimer() {
    _timer?.cancel();
  }

  fetchStatus() async {
    count--;
  }
}

Now, in some widget, I wanna listen the remaining time and push to a new page.
I don’t use the count to build widget, I just listen the count value changed.

How can I to do this?

Tags:

2

Answers


  1. 0

    You can achieve this functionality by using Getx Worker like this:

    class StatusManager extends GetxController {
  
  var count = 60.obs;
  Worker? listenerWorker;
  
  @override
  void onInit() async {
    super.onInit();
    listenerWorker = ever(count, (callback) {
      print("count: $callback ");
      // if(callback == 52){
      // add your logic or call related function here
      // }
    });
  }
  
  @override
  void onClose() async {
    listenerWorker?.dispose();
    super.onClose();
  }
  
}
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  2. 0

    you can try the below simple way that you can create a global variable to detect the time is end, for example:

    create a global variable class

    class Global {
   static RxBool isEndTime = false.obs;
}

    and update this flag in your StatusManager

    startTimer() {
    stopTimer();

    _timer = Timer.periodic(Duration(seconds: 1), (Timer t) {
      fetchStatus();
    });
  }

  fetchStatus() async {
    count--;
    if(count == 0){
      Global.isEndTime.value = true;  //update to end time
    }
  }

    and check it in another widget

    if(Global.isEndTime.value) {
    Global.isEndTime.value = false; //reset the value
    Get.to(() => OtherPage());
  }
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