/// <summary>
/// Publish target property when value is changed. If source is destroyed/destructed, publish OnCompleted.
/// </summary>
/// <param name="fastDestroyCheck">If true and target is UnityObject, use destroyed check by additional component. It is faster check for lifecycle but needs initial cost.</param>
public static IObservable <TProperty> ObserveEveryValueChanged <TSource, TProperty>(this TSource source, Func <TSource, TProperty> propertySelector, FrameCountType frameCountType, IEqualityComparer <TProperty> comparer, bool fastDestroyCheck)
where TSource : class
{
if (source == null)
{
return(Observable.Empty <TProperty>());
}
if (comparer == null)
{
comparer = UnityEqualityComparer.GetDefault <TProperty>();
}
var unityObject = source as UnityEngine.Object;
var isUnityObject = source is UnityEngine.Object;
if (isUnityObject && unityObject == null)
{
return(Observable.Empty <TProperty>());
}
// MicroCoroutine does not publish value immediately, so publish value on subscribe.
if (isUnityObject)
{
return(ObservableUnity.FromMicroCoroutine <TProperty>((observer, cancellationToken) =>
{
if (unityObject != null)
{
var firstValue = default(TProperty);
try
{
firstValue = propertySelector((TSource)(object)unityObject);
}
catch (Exception ex)
{
observer.OnError(ex);
return EmptyEnumerator();
}
observer.OnNext(firstValue);
return PublishUnityObjectValueChanged(unityObject, firstValue, propertySelector, comparer, observer, cancellationToken, fastDestroyCheck);
}
else
{
observer.OnCompleted();
return EmptyEnumerator();
}
}, frameCountType));
}
else
{
var reference = new WeakReference(source);
source = null;
return(ObservableUnity.FromMicroCoroutine <TProperty>((observer, cancellationToken) =>
{
var target = reference.Target;
if (target != null)
{
var firstValue = default(TProperty);
try
{
firstValue = propertySelector((TSource)target);
}
catch (Exception ex)
{
observer.OnError(ex);
return EmptyEnumerator();
}
finally
{
target = null;
}
observer.OnNext(firstValue);
return PublishPocoValueChanged(reference, firstValue, propertySelector, comparer, observer, cancellationToken);
}
else
{
observer.OnCompleted();
return EmptyEnumerator();
}
}, frameCountType));
}
}
/// <summary>
/// Publish target property when value is changed. If source is destroyed/destructed, publish OnCompleted.
/// </summary>
/// <param name="fastDestroyCheck">If true and target is UnityObject, use destroyed check by additional component. It is faster check for lifecycle but needs initial cost.</param>
public static IObservable <TProperty> ObserveEveryValueChanged <TSource, TProperty>(this TSource source, Func <TSource, TProperty> propertySelector, FrameCountType frameCountType = FrameCountType.Update, bool fastDestroyCheck = false)
where TSource : class
{
return(ObserveEveryValueChanged(source, propertySelector, frameCountType, UnityEqualityComparer.GetDefault <TProperty>(), fastDestroyCheck));
}