watchOnly4<R, T1, T2, T3, T4, TObs1, TObs2, TObs3, TObs4> function

Implementation

R watchOnly4<R, T1, T2, T3, T4, TObs1, TObs2, TObs3, TObs4>(
  BuildContext context,
  R Function(T1, T2, T3, T4) selector,
  Object obs1,
  Object obs2,
  Object obs3,
  Object obs4,
  T1 defaultValue1,
  T2 defaultValue2,
  T3 defaultValue3,
  T4 defaultValue4,
) {
  final contextWatch = InheritedContextWatch.of(context);

  final observable1 = contextWatch.getOrCreateObservable<TObs1>(context, obs1);
  if (observable1 == null) {
    return selector(defaultValue1, defaultValue2, defaultValue3, defaultValue4);
  }
  final arg1 = observable1.subscription.callbackArgument as T1;

  final observable2 = contextWatch.getOrCreateObservable<TObs2>(context, obs2)!;
  final arg2 = observable2.subscription.callbackArgument as T2;

  final observable3 = contextWatch.getOrCreateObservable<TObs3>(context, obs3)!;
  final arg3 = observable3.subscription.callbackArgument as T3;

  final observable4 = contextWatch.getOrCreateObservable<TObs4>(context, obs4)!;
  final arg4 = observable4.subscription.callbackArgument as T4;

  final selectedValue = selector(arg1, arg2, arg3, arg4);
  observable1.watchOnly(
    (arg1) => selector(
      arg1,
      observable2.subscription.callbackArgument as T2,
      observable3.subscription.callbackArgument as T3,
      observable4.subscription.callbackArgument as T4,
    ),
    selectedValue,
  );
  observable2.watchOnly(
    (arg2) => selector(
      observable1.subscription.callbackArgument as T1,
      arg2,
      observable3.subscription.callbackArgument as T3,
      observable4.subscription.callbackArgument as T4,
    ),
    selectedValue,
  );
  observable3.watchOnly(
    (arg3) => selector(
      observable1.subscription.callbackArgument as T1,
      observable2.subscription.callbackArgument as T2,
      arg3,
      observable4.subscription.callbackArgument as T4,
    ),
    selectedValue,
  );
  observable4.watchOnly(
    (arg4) => selector(
      observable1.subscription.callbackArgument as T1,
      observable2.subscription.callbackArgument as T2,
      observable3.subscription.callbackArgument as T3,
      arg4,
    ),
    selectedValue,
  );
  return selectedValue;
}