/// <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); } }