/// <summary>
/// A timer that is capable of being paused and resumed. It does not maintain the long value of the sequence
/// between pauses because i have never found use for this value ;)
///
/// limitation: when the timer is paused and resumed, it starts producing values again straight away, if even if the period has not elpased yet
/// </summary>
/// <param name="dueTime"></param>
/// <param name="period"></param>
/// <param name="isPaused"></param>
/// <param name="scheduler"></param>
/// <returns></returns>
public static IObservable <long> TimerWithPause(DateTimeOffset dueTime, TimeSpan period, IObservable <bool> isPaused, IScheduler scheduler = null)
{
return(RxObservable.DfrCreate <long>(o =>
{
var isFirst = true;
IDisposable timer = null;
Func <bool, IObservable <long> > createTimer = (isInital) =>
{
return Observable.Timer(isInital ? dueTime : DateTimeOffset.MinValue, period, scheduler ?? Scheduler.Default).Do(v => o.OnNext(v), error => o.OnError(error));
};
var playPauser = isPaused.If(paused => paused, _ =>
{
if (timer != null)
{
timer.Dispose();
}
})
.If(paused => !paused, _ =>
{
timer = createTimer(isFirst).Subscribe();
isFirst = false;
})
.Subscribe();
return new CompositeDisposable(timer, playPauser);
}));
}
//todo: convert to Run syntax
public override IObservable <CommandResult> Start(string @from = null, string options = null)
{
return(RxObservable.Create(() =>
{
var @default = GetOrCreate(DefaultReactorName);
if (@default.Connection != null)
{
return CommandResult.Success();
}
@default.Connection = @default.Reactor.Chain(_rxnManager);
return CommandResult.Success();
}));
}
/// <summary>
/// Sets up a new reaction pipeline on a component that implements INotifyPropertyChanged. This is
///
/// This method is provided for interop on platforms that dont support the ExpandoObject (dynamic) ie. Xamarin.iOS
/// </summary>
/// <typeparam name="T"></typeparam>
/// <param name="source"></param>
/// <param name="observeInitial">If the subscription will be alerted as soon as its made, no property change is required</param>
/// <param name="scheduler"></param>
/// <param name="properties">The properties to watch for changes to</param>
/// <returns>A dictionary with the propertName as the key, and property value which u will need to cast to whatever type they are supposed to be</returns>
public static IObservable <Dictionary <string, object> > OnReaction <T>(this T source, bool observeInitial,
IScheduler scheduler, params Expression <Func <T, object> >[] properties) where T : INotifyPropertyChanged
{
return(RxObservable.DfrCreate <Dictionary <string, object> >(o =>
{
try
{
var propertyNames = new Dictionary <string, Func <T, object> >();
Func <Dictionary <string, object> > GetValues = () =>
{
var d = new Dictionary <string, object>();
foreach (var p in propertyNames)
{
d[p.Key] = p.Value.Invoke(source);
}
return d;
};
foreach (var property in properties)
{
propertyNames.Add(property.GetPropertyInfo().Name, property.Compile());
}
var sub = IObservableExtensions
.FromPropertyChanged <PropertyChangedEventHandler, PropertyChangedEventArgs>(
handler => handler.Invoke,
h => source.PropertyChanged += h,
h => source.PropertyChanged -= h)
.Where(e => propertyNames.ContainsKey(e.EventArgs.PropertyName))
.Select(e => GetValues());
if (observeInitial)
{
sub = sub.StartWith(GetValues());
}
return sub.Subscribe(o);
}
catch (Exception e)
{
o.OnError(e);
return Disposable.Empty;
}
})
.ObserveOn(scheduler)
.SubscribeOn(scheduler));
}
