public static void ObservableFromEventPattern_IsTheEventObserverPatternImplementationOnSteroids(Form form)
{
Observable.FromEventPattern <MouseEventArgs>(form, nameof(form.MouseClick))
.Subscribe(
mm => form.AppendToBox($"Clicked @ {mm.EventArgs.X} - {mm.EventArgs.Y}"),
ex => form.AppendToBox(ex.Message));
}
public static void DispatcherScheduler_CanBeUsedToEmitAndConsume_OnTheUIThread(Form form)
{
//Execution Context: UI Thread
//Execution Policy: Priority FIFO (non-blocking)
//Clock: Machine Time
Observable.Interval(TimeSpan.FromMilliseconds(250), new DispatcherScheduler(Dispatcher.CurrentDispatcher))
.Take(6)
.Subscribe(i => form.AppendToBox($"Blipp{i}"));
form.AppendToBox("Finished");
}
public static void Throttle_GuardsAgainstPeaks_IsGreatForUserInteraction(Form form)
{
var moves = Observable.FromEventPattern <EventArgs>(form, nameof(form.Move));
moves.Sample(TimeSpan.FromMilliseconds(500))
.Timestamp()
.ObserveOn(SynchronizationContext.Current)
.Subscribe(m => form.AppendToBox($"Still moving it around, last one @{m.Timestamp}"));
moves.Throttle(TimeSpan.FromMilliseconds(750))
.Timestamp()
.ObserveOn(SynchronizationContext.Current)
.Subscribe(i => form.AppendToBox($"Blipped @{i.Timestamp}"), ex => form.AppendToBox(ex.Message));
}
public static void Aggregate_IsPowerful_ButBoundByCompletion(Form form)
{
var moves = Observable.FromEventPattern <MouseEventArgs>(form, nameof(form.MouseMove));
var doubleClicks = Observable.FromEventPattern <EventArgs>(form, nameof(form.DoubleClick));
moves.TakeUntil(doubleClicks)
.Aggregate(
(start: DateTime.Now, distance: 0, previous: new MouseEventArgs(MouseButtons.None, 0, 0, 0, 0)),
(accumulator, current) =>
{
accumulator.distance += Math.Abs(current.EventArgs.X - accumulator.previous.X);
accumulator.previous = current.EventArgs;
return(accumulator);
})
.Subscribe(
agg => form.AppendToBox($"Moused a total of {agg.distance} pixels over a time period of {DateTime.Now.Subtract(agg.start)}"),
ex => form.AppendToBox(ex.Message));
}
public static void Scan_IsJustAggregate_WithAllIntermediateSteps(Form form)
{
var moves = Observable.FromEventPattern <MouseEventArgs>(form, nameof(form.MouseMove));
var doubleClicks = Observable.FromEventPattern <EventArgs>(form, nameof(form.DoubleClick));
var start = DateTime.Now;
moves.TakeUntil(doubleClicks)
.Scan(
(start, distance: 0, previous: new MouseEventArgs(MouseButtons.None, 0, 0, 0, 0)),
(accumulator, current) =>
{
accumulator.distance += Math.Abs(current.EventArgs.X - accumulator.previous.X);
accumulator.previous = current.EventArgs;
return(accumulator);
})
.Subscribe(
agg => form.AppendToBox($"Moused a total of {agg.distance} pixels *so far*"),
ex => form.AppendToBox(ex.Message),
() => form.AppendToBox($"Moused over a time period of {DateTime.Now.Subtract(start)}"));
}
