flutter_firestore_tut
//... | |
class _Home extends State<StatefulWidget> { | |
//... | |
void switchListener(isOn) async { | |
bool switcher; | |
switch (isOn) { | |
case true: | |
switcher = true; | |
_listener = Firestore.instance | |
.collection('docs') | |
.snapshots() | |
.listen((data) => listenerUpdate(data)); | |
break; | |
case false: | |
switcher = false; | |
await _listener.cancel(); | |
break; | |
} | |
setState(() { | |
_switchOnOff = switcher; | |
}); | |
} | |
void listenerUpdate(data) { | |
var number = data.documents.length; | |
setState(() { | |
_totalDocs = number; | |
}); | |
} | |
//... | |
@override | |
Widget build(BuildContext context) { | |
return Scaffold( | |
//... | |
} | |
} |
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