import 'package:flutter_riverpod/flutter_riverpod.dart';

class DoubleNotifier extends StateNotifier<MyState> {
DoubleNotifier(): super(const MyState(startValue: 0,endValue: 0));

void changeStartValue(double startValue){
  state = state.copyWith(startValue: startValue);
}

void changeEndValue(double endValue){
  state = state.copyWith(endValue: endValue);
}

void changeBothValue(double startValue, double endValue){
  state = state.copyWith(startValue: startValue, endValue:  endValue);
}

}

class MyState {

  final double startValue;
  final double endValue;

  const MyState({required this.startValue,required this.endValue});

  MyState copyWith({double? startValue, double? endValue}){
    return MyState(
        startValue: startValue ?? this.startValue,
        endValue: endValue ?? this.endValue
    );
  }

}