All tests so far pass!

Perspex.UnitTests/Styling/TestSelectors.cs

@@ -14,7 +14,7 @@ namespace Perspex.UnitTests.Styling
         {
             return new Selector(selector)
             {
-                Observable = control => ((TestControlBase)control).SubscribeCheckObservable,
+                GetObservable = control => ((TestControlBase)control).SubscribeCheckObservable,
             };
         }
     }

Perspex/Styling/Selector.cs

@@ -17,29 +17,29 @@ namespace Perspex.Styling
     {
         private bool stopTraversal;
 
-        private Func<IStyleable, IObservable<bool>> observable;
-
         public Selector()
         {
+            this.GetObservable = _ => Observable.Return(true);
         }
 
         public Selector(Selector previous, bool stopTraversal = false)
+            : this()
         {
             this.Previous = previous;
+            this.InTemplate = previous != null ? previous.InTemplate : false;
             this.stopTraversal = stopTraversal;
         }
 
-        public Func<IStyleable, IObservable<bool>> Observable
+        public bool InTemplate
         {
-            get
-            {
-                return this.observable;
-            }
-            
-            set
-            {
-                this.observable = value;
-            }
+            get;
+            set;
+        }
+
+        public Func<IStyleable, IObservable<bool>> GetObservable
+        {
+            get;
+            set;
         }
 
         public Selector Previous
@@ -66,9 +66,14 @@ namespace Perspex.Styling
             
             while (selector != null)
             {
-                if (selector.Observable != null)
+                if ((selector.InTemplate && control.TemplatedParent == null) ||
+                    (!selector.InTemplate && control.TemplatedParent != null))
+                {
+                    inputs.Add(Observable.Return(false));
+                }
+                else
                 {
-                    inputs.Add(selector.Observable(control));
+                    inputs.Add(selector.GetObservable(control));
                 }
 
                 selector = selector.MovePrevious();

Perspex/Styling/Selectors.cs

@@ -20,7 +20,7 @@ namespace Perspex.Styling
 
             return new Selector(previous)
             {
-                Observable = control => Observable
+                GetObservable = control => Observable
                     .Return(control.Classes.Contains(name))
                     .Concat(control.Classes.Changed.Select(e => control.Classes.Contains(name))),
                 SelectorString = (name[0] == ':') ? name : '.' + name,
@@ -32,7 +32,7 @@ namespace Perspex.Styling
             return new Selector(previous, stopTraversal: true)
             {
                 SelectorString = " ",
-                Observable = control =>
+                GetObservable = control =>
                 {
                     ILogical c = (ILogical)control;
                     List<IObservable<bool>> descendentMatches = new List<IObservable<bool>>();
@@ -43,7 +43,7 @@ namespace Perspex.Styling
 
                         if (c is IStyleable)
                         {
-                            descendentMatches.Add(previous.Observable((IStyleable)c));
+                            descendentMatches.Add(previous.GetObservable((IStyleable)c));
                         }
                     }
 
@@ -58,7 +58,7 @@ namespace Perspex.Styling
 
             return new Selector(previous)
             {
-                Observable = control => Observable.Return(control.Id == id),
+                GetObservable = control => Observable.Return(control.Id == id),
                 SelectorString = '#' + id,
             };
         }
@@ -69,7 +69,7 @@ namespace Perspex.Styling
 
             return new Selector(previous)
             {
-                Observable = control => Observable.Return(control is T),
+                GetObservable = control => Observable.Return(control is T),
                 SelectorString = typeof(T).Name,
             };
         }
@@ -78,9 +78,16 @@ namespace Perspex.Styling
         {
             Contract.Requires<ArgumentNullException>(previous != null);
 
-            return new Selector(previous)
+            return new Selector(previous, stopTraversal: true)
             {
-                Observable = control => Observable.Return(control.TemplatedParent != null),
+                GetObservable = control => 
+                {
+                    IStyleable templatedParent = control.TemplatedParent as IStyleable;
+                    return templatedParent != null ?
+                        previous.GetObservable(templatedParent) :
+                        Observable.Return(true);
+                },
+                InTemplate = true,
                 SelectorString = " $ ",
             };
         }