gesture_debouncer
Created simple widget that can act as debouncer to absorb certain gestures according to the cooldowns/futures. This widget is super helpful when triggering a backend api with ui interaction. It makes sure that if user by mistake clicked several times then backend api is not called in every click. Usually websockets/rest api use callbacks on success, in such cases use Completer to convert them to Future and use in this widget.
Completer<List?> completer = Completer<List?>();
Socketio!.emitWithAck("your backend socketio event", params, ack: (data) {
if (data) // if data is as expected
{
if (!completer.isCompleted) {
completer.complete(data);
}
} else {
if (!completer.isCompleted) {
completer.complete(null);
}
}
});
return completer.future;
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Example
for full example please view example/main.dart
Widget _getIconWidget(onPressed) {
return IconButton(
icon: Icon(
liked ? FontAwesome.heart : FontAwesome.heart_empty,
),
iconSize: iconSize,
color: liked ? Colors.red : Colors.grey,
onPressed: onPressed,
);
}
// For detecting other gestures
Widget _getDoubleClickWidget(onPressed) {
return GestureDetector(
onDoubleTap: onPressed,
child: Icon(
liked2 ? FontAwesome.heart : FontAwesome.heart_empty,
size: iconSize,
color: liked2 ? Colors.green : Colors.grey,
),
);
}GestureDebouncer(
cooldownAfterExecution: const Duration(seconds: 5),
cooldownBuilder: (BuildContext ctx, _) {
return Stack(
alignment: AlignmentDirectional.center,
children: [
_getIconWidget(() {
if (liked) {
toast("You have recently liked this");
} else {
toast("You have recently unliked this");
}
}),
IgnorePointer(
// Used so that main icon gets the click event
child: Icon(
Icons.lock_outline,
color: liked ? Colors.white : Colors.grey,
size: iconSize / 3,
),
),
],
);
},
onError: (e) {
log(e.toString());
},
builder: (BuildContext ctx, Future<void> Function()? onGesture) {
return _getIconWidget(onGesture);
},
onGesture: () async {
setState(() {
liked = !liked;
});
await Future.delayed(const Duration(seconds: 5), () {});
},
)Screenshot
