101 lines
5.4 KiB
C#
101 lines
5.4 KiB
C#
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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#if HAS_WINRT
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using System.Threading;
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using Windows.Foundation;
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namespace System.Reactive.Linq
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{
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/// <summary>
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/// Provides a set of static methods for importing typed events from Windows Runtime APIs.
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/// </summary>
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public static partial class WindowsObservable
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{
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/// <summary>
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/// Converts a typed event, conforming to the standard event pattern, to an observable sequence.
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/// </summary>
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/// <typeparam name="TSender">The type of the sender that raises the event.</typeparam>
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/// <typeparam name="TResult">The type of the event data generated by the event.</typeparam>
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/// <param name="addHandler">Action that attaches the given event handler to the underlying .NET event.</param>
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/// <param name="removeHandler">Action that detaches the given event handler from the underlying .NET event.</param>
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/// <returns>The observable sequence that contains data representations of invocations of the underlying typed event.</returns>
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/// <exception cref="ArgumentNullException"><paramref name="addHandler"/> or <paramref name="removeHandler"/> is null.</exception>
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/// <seealso cref="WindowsObservable.ToEventPattern"/>
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public static IObservable<EventPattern<TSender, TResult>> FromEventPattern<TSender, TResult>(Action<TypedEventHandler<TSender, TResult>> addHandler, Action<TypedEventHandler<TSender, TResult>> removeHandler)
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{
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if (addHandler == null)
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throw new ArgumentNullException("addHandler");
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if (removeHandler == null)
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throw new ArgumentNullException("removeHandler");
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return Observable.Create<EventPattern<TSender, TResult>>(observer =>
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{
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var h = new TypedEventHandler<TSender, TResult>((sender, args) =>
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{
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observer.OnNext(new EventPattern<TSender, TResult>(sender, args));
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});
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addHandler(h);
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return () =>
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{
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removeHandler(h);
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};
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});
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}
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/// <summary>
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/// Converts a typed event, conforming to the standard event pattern, to an observable sequence.
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/// </summary>
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/// <typeparam name="TDelegate">The delegate type of the event to be converted.</typeparam>
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/// <typeparam name="TSender">The type of the sender that raises the event.</typeparam>
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/// <typeparam name="TResult">The type of the event data generated by the event.</typeparam>
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/// <param name="conversion">A function used to convert the given event handler to a delegate compatible with the underlying typed event. The resulting delegate is used in calls to the addHandler and removeHandler action parameters.</param>
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/// <param name="addHandler">Action that attaches the given event handler to the underlying .NET event.</param>
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/// <param name="removeHandler">Action that detaches the given event handler from the underlying .NET event.</param>
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/// <returns>The observable sequence that contains data representations of invocations of the underlying typed event.</returns>
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/// <exception cref="ArgumentNullException"><paramref name="conversion"/> or <paramref name="addHandler"/> or <paramref name="removeHandler"/> is null.</exception>
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/// <seealso cref="WindowsObservable.ToEventPattern"/>
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public static IObservable<EventPattern<TSender, TResult>> FromEventPattern<TDelegate, TSender, TResult>(Func<TypedEventHandler<TSender, TResult>, TDelegate> conversion, Action<TDelegate> addHandler, Action<TDelegate> removeHandler)
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{
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if (conversion == null)
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throw new ArgumentNullException("conversion");
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if (addHandler == null)
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throw new ArgumentNullException("addHandler");
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if (removeHandler == null)
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throw new ArgumentNullException("removeHandler");
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return Observable.Create<EventPattern<TSender, TResult>>(observer =>
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{
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var h = conversion(new TypedEventHandler<TSender, TResult>((sender, args) =>
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{
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observer.OnNext(new EventPattern<TSender, TResult>(sender, args));
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}));
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addHandler(h);
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return () =>
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{
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removeHandler(h);
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};
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});
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}
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/// <summary>
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/// Exposes an observable sequence as an object with a typed event.
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/// </summary>
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/// <typeparam name="TSender">The type of the sender that raises the event.</typeparam>
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/// <typeparam name="TEventArgs">The type of the event data generated by the event.</typeparam>
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/// <param name="source">Observable source sequence.</param>
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/// <returns>The event source object.</returns>
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/// <exception cref="ArgumentNullException"><paramref name="source"/> is null.</exception>
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public static IEventPatternSource<TSender, TEventArgs> ToEventPattern<TSender, TEventArgs>(this IObservable<EventPattern<TSender, TEventArgs>> source)
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{
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if (source == null)
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throw new ArgumentNullException("source");
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return new EventPatternSource<TSender, TEventArgs>(source, (h, evt) => h(evt.Sender, evt.EventArgs));
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}
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}
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}
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#endif |