/// <inheritdoc/>
public IObservable <IObservedChange <object, object> > GetNotificationForProperty(object sender, Expression expression, string propertyName, bool beforeChanged = false)
{
var obj = sender as NSObject;
if (obj == null)
{
throw new ArgumentException("Sender isn't an NSObject");
}
return(Observable.Create <IObservedChange <object, object> >(subj =>
{
var bobs = new BlockObserveValueDelegate((key, s, _) =>
{
subj.OnNext(new ObservedChange <object, object>(s, expression));
});
var pin = GCHandle.Alloc(bobs);
var keyPath = (NSString)FindCocoaNameFromNetName(sender.GetType(), propertyName);
obj.AddObserver(bobs, keyPath, beforeChanged ? NSKeyValueObservingOptions.Old : NSKeyValueObservingOptions.New, IntPtr.Zero);
return Disposable.Create(() =>
{
obj.RemoveObserver(bobs, keyPath);
pin.Free();
});
}));
}
public IObservable<IObservedChange<object, object>> GetNotificationForProperty(object sender, Expression expression, bool beforeChanged = false)
{
var obj = sender as NSObject;
if (obj == null) {
throw new ArgumentException("Sender isn't an NSObject");
}
var propertyName = expression.GetMemberInfo().Name;
return Observable.Create<IObservedChange<object, object>>(subj => {
var bobs = new BlockObserveValueDelegate((key,s,_) => {
subj.OnNext(new ObservedChange<object, object>(s, expression));
});
var pin = GCHandle.Alloc(bobs);
var keyPath = (NSString)findCocoaNameFromNetName(sender.GetType(), propertyName);
obj.AddObserver(bobs, keyPath, beforeChanged ? NSKeyValueObservingOptions.Old : NSKeyValueObservingOptions.New, IntPtr.Zero);
return Disposable.Create(() => {
obj.RemoveObserver(bobs, keyPath);
pin.Free();
});
});
}
