watchOnly2<R, T1, T2, TObs1, TObs2> function
R
watchOnly2<R, T1, T2, TObs1, TObs2>(
- BuildContext context,
- R selector(
- T1,
- T2
- Object obs1,
- Object obs2,
- T1 defaultValue1,
- T2 defaultValue2,
Implementation
R watchOnly2<R, T1, T2, TObs1, TObs2>(
BuildContext context,
R Function(T1, T2) selector,
Object obs1,
Object obs2,
T1 defaultValue1,
T2 defaultValue2,
) {
final contextWatch = InheritedContextWatch.of(context);
final observable1 = contextWatch.getOrCreateObservable<TObs1>(context, obs1);
if (observable1 == null) {
return selector(defaultValue1, defaultValue2);
}
final arg1 = observable1.subscription.callbackArgument as T1;
final observable2 = contextWatch.getOrCreateObservable<TObs2>(context, obs2)!;
final arg2 = observable2.subscription.callbackArgument as T2;
final selectedValue = selector(arg1, arg2);
observable1.watchOnly(
(arg1) => selector(
arg1,
observable2.subscription.callbackArgument as T2,
),
selectedValue,
);
observable2.watchOnly(
(arg2) => selector(
observable1.subscription.callbackArgument as T1,
arg2,
),
selectedValue,
);
return selectedValue;
}