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increment.dart
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increment.dart
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import 'package:cloud_firestore/cloud_firestore.dart';
class Increment<T extends num> {
Increment({
this.value,
this.incrementValue,
});
final T? value;
T? incrementValue;
bool isClearValue = false;
Map<String, dynamic> toData(
num value, {
required String fieldName,
bool? isClear,
}) =>
<String, dynamic>{
fieldName: isClear != true ? FieldValue.increment(value) : value,
};
Increment<T> onRefresh() {
Increment<T> result;
if (isClearValue) {
final _value = T.toString() == 'double' ? 0.0 : 0;
result = Increment<T>(value: _value as T);
} else {
if (incrementValue != null) {
final _value =
value != null ? value! + incrementValue! : incrementValue;
result = Increment<T>(value: _value! as T);
} else {
result = Increment<T>(value: value);
}
}
_clear();
return result;
}
void _clear() {
incrementValue = null;
isClearValue = false;
}
}