private static SelectorMatch MatchDescendent(IStyleable control, Selector previous)
{
ILogical c = (ILogical)control;
List <IObservable <bool> > descendentMatches = new List <IObservable <bool> >();
while (c != null)
{
c = c.LogicalParent;
if (c is IStyleable)
{
var match = previous.Match((IStyleable)c);
if (match.ImmediateResult != null)
{
if (match.ImmediateResult == true)
{
return(SelectorMatch.True);
}
}
else
{
descendentMatches.Add(match.ObservableResult);
}
}
}
return(new SelectorMatch(StyleActivator.Or(descendentMatches)));
}
/// <summary>
/// Tries to match the selector with a control.
/// </summary>
/// <param name="control">The control.</param>
/// <returns>A <see cref="SelectorMatch"/>.</returns>
public SelectorMatch Match(IStyleable control)
{
List <IObservable <bool> > inputs = new List <IObservable <bool> >();
Selector selector = this;
while (selector != null)
{
if (selector._inTemplate && control.TemplatedParent == null)
{
return(SelectorMatch.False);
}
var match = selector._evaluate(control);
if (match.ImmediateResult == false)
{
return(match);
}
else if (match.ObservableResult != null)
{
inputs.Add(match.ObservableResult);
}
selector = selector.MovePrevious();
}
if (inputs.Count > 0)
{
return(new SelectorMatch(StyleActivator.And(inputs)));
}
else
{
return(SelectorMatch.True);
}
}
public void Activator_And_Should_Follow_Single_Input()
{
var inputs = new[] { new TestSubject<bool>(false) };
var target = new StyleActivator(inputs, ActivatorMode.And);
var result = new TestObserver<bool>();
target.Subscribe(result);
Assert.False(result.GetValue());
inputs[0].OnNext(true);
Assert.True(result.GetValue());
inputs[0].OnNext(false);
Assert.False(result.GetValue());
inputs[0].OnNext(true);
Assert.True(result.GetValue());
Assert.Equal(1, inputs[0].SubscriberCount);
}
public void Activator_And_Should_Not_Unsubscribe_All_When_Input_Completes_On_True()
{
var inputs = new[]
{
new TestSubject<bool>(false),
new TestSubject<bool>(false),
new TestSubject<bool>(true),
};
var target = new StyleActivator(inputs, ActivatorMode.And);
var result = new TestObserver<bool>();
target.Subscribe(result);
Assert.False(result.GetValue());
inputs[0].OnNext(true);
inputs[0].OnCompleted();
Assert.Equal(1, inputs[0].SubscriberCount);
Assert.Equal(1, inputs[1].SubscriberCount);
Assert.Equal(1, inputs[2].SubscriberCount);
}
public void Attach(IStyleable control)
{
string description = "Style " + this.Selector.ToString();
StyleActivator activator = this.Selector.GetActivator(control);
if (activator.CurrentValue || !activator.HasCompleted)
{
IObservable <bool> observable = activator;
// If the activator has completed, then we want its value to be true forever.
// Because of this we can't pass the activator directly as it will complete
// immediately and remove the binding.
if (activator.HasCompleted)
{
observable = Observable.Never <bool>().StartWith(true);
}
foreach (Setter setter in this.Setters)
{
StyleBinding binding = new StyleBinding(observable, setter.Value, description);
control.Bind(setter.Property, binding, this.Selector.Priority);
}
}
}
protected override SelectorMatch Evaluate(IStyleable control, bool subscribe)
{
ILogical c = (ILogical)control;
List <IObservable <bool> > descendentMatches = new List <IObservable <bool> >();
while (c != null)
{
c = c.LogicalParent;
if (c is IStyleable)
{
var match = _parent.Match((IStyleable)c, subscribe);
if (match.ImmediateResult != null)
{
if (match.ImmediateResult == true)
{
return(SelectorMatch.True);
}
}
else
{
descendentMatches.Add(match.ObservableResult);
}
}
}
if (descendentMatches.Count > 0)
{
return(new SelectorMatch(StyleActivator.Or(descendentMatches)));
}
else
{
return(SelectorMatch.False);
}
}
public void Completed_Activator_Should_Signal_OnCompleted()
{
var inputs = new[]
{
Observable.Return(false),
};
var target = new StyleActivator(inputs, ActivatorMode.Or);
var completed = false;
target.Subscribe(_ => { }, () => completed = true);
Assert.True(completed);
}
public void Activator_Or_Should_OR_Multiple_Inputs()
{
var inputs = new[]
{
new TestSubject<bool>(false),
new TestSubject<bool>(false),
new TestSubject<bool>(true),
};
var target = new StyleActivator(inputs, ActivatorMode.Or);
var result = new TestObserver<bool>();
target.Subscribe(result);
Assert.True(result.GetValue());
inputs[2].OnNext(false);
Assert.False(result.GetValue());
inputs[0].OnNext(true);
Assert.True(result.GetValue());
Assert.Equal(1, inputs[0].SubscriberCount);
Assert.Equal(1, inputs[1].SubscriberCount);
Assert.Equal(1, inputs[2].SubscriberCount);
}
