104 lines
3.6 KiB
C#
104 lines
3.6 KiB
C#
//-----------------------------------------------------------------------------
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//-----------------------------------------------------------------------------
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namespace System.Activities.Statements
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{
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using System;
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using System.Activities;
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using System.Collections.ObjectModel;
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using System.ComponentModel;
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using System.Runtime;
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using System.Windows.Markup;
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[ContentProperty("Duration")]
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public sealed class Delay : NativeActivity
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{
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static Func<TimerExtension> getDefaultTimerExtension = new Func<TimerExtension>(GetDefaultTimerExtension);
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Variable<Bookmark> timerBookmark;
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public Delay()
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: base()
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{
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this.timerBookmark = new Variable<Bookmark>();
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}
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[RequiredArgument]
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[DefaultValue(null)]
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public InArgument<TimeSpan> Duration
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{
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get;
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set;
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}
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protected override bool CanInduceIdle
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{
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get
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{
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return true;
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}
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}
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protected override void CacheMetadata(NativeActivityMetadata metadata)
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{
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RuntimeArgument durationArgument = new RuntimeArgument("Duration", typeof(TimeSpan), ArgumentDirection.In, true);
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metadata.Bind(this.Duration, durationArgument);
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metadata.SetArgumentsCollection(new Collection<RuntimeArgument> { durationArgument });
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metadata.AddImplementationVariable(this.timerBookmark);
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metadata.AddDefaultExtensionProvider(getDefaultTimerExtension);
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}
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static TimerExtension GetDefaultTimerExtension()
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{
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return new DurableTimerExtension();
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}
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protected override void Execute(NativeActivityContext context)
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{
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TimeSpan duration = this.Duration.Get(context);
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if (duration < TimeSpan.Zero)
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{
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throw FxTrace.Exception.ArgumentOutOfRange("Duration", duration, SR.DurationIsNegative(this.DisplayName));
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}
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if (duration == TimeSpan.Zero)
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{
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return;
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}
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TimerExtension timerExtension = GetTimerExtension(context);
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Bookmark bookmark = context.CreateBookmark();
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timerExtension.RegisterTimer(duration, bookmark);
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this.timerBookmark.Set(context, bookmark);
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}
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protected override void Cancel(NativeActivityContext context)
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{
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Bookmark timerBookmark = this.timerBookmark.Get(context);
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TimerExtension timerExtension = GetTimerExtension(context);
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timerExtension.CancelTimer(timerBookmark);
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context.RemoveBookmark(timerBookmark);
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context.MarkCanceled();
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}
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protected override void Abort(NativeActivityAbortContext context)
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{
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Bookmark timerBookmark = this.timerBookmark.Get(context);
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// The bookmark could be null in abort when user passed in a negative delay as a duration
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if (timerBookmark != null)
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{
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TimerExtension timerExtension = GetTimerExtension(context);
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timerExtension.CancelTimer(timerBookmark);
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}
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base.Abort(context);
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}
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TimerExtension GetTimerExtension(ActivityContext context)
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{
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TimerExtension timerExtension = context.GetExtension<TimerExtension>();
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Fx.Assert(timerExtension != null, "TimerExtension must exist.");
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return timerExtension;
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}
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}
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}
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