/// <summary>
/// Tries to match the selector with a control.
/// </summary>
/// <param name="control">The control.</param>
/// <param name="subscribe">
/// Whether the match should subscribe to changes in order to track the match over time,
/// or simply return an immediate result.
/// </param>
/// <returns>A <see cref="SelectorMatch"/>.</returns>
public SelectorMatch Match(IStyleable control, bool subscribe = true)
{
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, subscribe);
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);
}
}
/// <summary>
/// Tries to match the selector with a control.
/// </summary>
/// <param name="control">The control.</param>
/// <param name="subscribe">
/// Whether the match should subscribe to changes in order to track the match over time,
/// or simply return an immediate result.
/// </param>
/// <returns>A <see cref="SelectorMatch"/>.</returns>
public SelectorMatch Match(IStyleable control, bool subscribe = true)
{
ValueSingleOrList <IObservable <bool> > inputs = default;
var selector = this;
var alwaysThisType = true;
var hitCombinator = false;
while (selector != null)
{
hitCombinator |= selector.IsCombinator;
var match = selector.Evaluate(control, subscribe);
if (!match.IsMatch)
{
return(hitCombinator ? SelectorMatch.NeverThisInstance : match);
}
else if (selector.InTemplate && control.TemplatedParent == null)
{
return(SelectorMatch.NeverThisInstance);
}
else if (match.Result == SelectorMatchResult.AlwaysThisInstance)
{
alwaysThisType = false;
}
else if (match.Result == SelectorMatchResult.Sometimes)
{
Debug.Assert(match.Activator != null);
inputs.Add(match.Activator);
}
selector = selector.MovePrevious();
}
if (inputs.HasList)
{
return(new SelectorMatch(StyleActivator.And(inputs.List)));
}
else if (inputs.IsSingle)
{
return(new SelectorMatch(inputs.Single));
}
else
{
return(alwaysThisType && !hitCombinator ?
SelectorMatch.AlwaysThisType :
SelectorMatch.AlwaysThisInstance);
}
}
