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//! `WhenPropertyChanged` (`Cache/ObservableCacheEx.WhenPropertyChanged.cs`).
macro_rules! when_property_changed_methods {
() => {
/// The changes of the property of `property_accessor` of every item, as the item with the
/// value, the current values first, merged; an item that a null step of the path leaves
/// without a value produces nothing
/// (`WhenPropertyChanged(Expression<Func<TObject, TValue>>, bool notifyOnInitialValue = true)`).
fn when_property_changed<P: crate::binding::IntoPropertyChain<T>>(
&self,
property_accessor: P,
) -> std::rc::Rc<dyn ferroui_system::IObservable<crate::binding::PropertyValue<T, P::Value>>>
where
P::Value: 'static,
{
self.when_property_changed_with(property_accessor, true)
}
/// [`when_property_changed`](Self::when_property_changed) that starts with the current
/// values only when `notify_on_initial_value` is true
/// (`WhenPropertyChanged(Expression<Func<TObject, TValue>>, bool)`).
fn when_property_changed_with<P: crate::binding::IntoPropertyChain<T>>(
&self,
property_accessor: P,
notify_on_initial_value: bool,
) -> std::rc::Rc<dyn ferroui_system::IObservable<crate::binding::PropertyValue<T, P::Value>>>
where
P::Value: 'static,
{
let chain = crate::binding::IntoPropertyChain::into_property_chain(property_accessor);
crate::cache::internal::merge_item_observables(
self.change_sets(),
std::rc::Rc::new(move |item: &T, _: &K| crate::binding::when_property_changed_of(chain.clone(), item.clone(), notify_on_initial_value, false)),
)
}
};
}
pub(crate) use when_property_changed_methods;