CODEWITHSUNDEEP
flutterdartgoogle-cloud-firestorestream
Cenk YAGMUR
Cenk YAGMUR

Reputation: 3451

How can i firestore stream snapsnot pause

I have a structure made up of tabs. I'm listening which tab you're in. I am using AutomaticKeepAliveClientMixin in tabs

late StreamSubscription _subscription;

@override
  void initState() {
    super.initState();
    _subscription = FirebaseFirestore.instance
  .collection('users')
  .doc(id)
  .snapshots().listen((DocumentSnapshot snapshot) => _onUpdate(snapshot));
    widget.tab?.addListener(_tabListener);
  }

@override
  void dispose() {
    _subscription.cancel();
    widget.tab?.removeListener(_tabListener);
    super.dispose();
  }

_tabListener () {
    if(widget.tab?.page == 0.0) {
      if(_subscription.isPaused) {
        _subscription.resume();
      }
    } else {
      _subscription.pause();
    }
  }

No problem so far, it stops listening and picks up where it left off, but when it starts again it brings all the changes that happened when it stopped.

Keeps sending snapshot changes constantly in the background.

I want the stream to stop completely when the tab changes, and start over when it comes to tab, how can I do that?

Upvotes: 0

Views: 203

Answers (1)

Lluís Muñoz
Lluís Muñoz

Reputation: 419

According to the StreamSubscription pause method documentation, if the subscription receives events while paused they will be buffered until the subscription is resumed.

As explained in this paragraph the recommended solution to avoid buffering events would be to cancel the subscription and start it again when needed.

Upvotes: 1

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