Fixed navigation (I think).

Perspex.Input/Navigation/DirectionalNavigation.cs

@@ -140,8 +140,6 @@ namespace Perspex.Input.Navigation
             {
                 var navigable = container as INavigableContainer;
 
-                // TODO: Do a spatial search here if the container doesn't implement
-                // INavigableContainer.
                 if (navigable != null)
                 {
                     while (element != null)
@@ -154,6 +152,12 @@ namespace Perspex.Input.Navigation
                         }
                     }
                 }
+                else
+                {
+                    // TODO: Do a spatial search here if the container doesn't implement
+                    // INavigableContainer.
+                    element = null;
+                }
 
                 if (element != null && direction == FocusNavigationDirection.Up)
                 {
@@ -187,6 +191,11 @@ namespace Perspex.Input.Navigation
 
             if (parent != null)
             {
+                if (!isForward && parent.CanFocus())
+                {
+                    return parent;
+                }
+
                 var siblings = parent.GetVisualChildren()
                     .OfType<IInputElement>()
                     .Where(FocusExtensions.CanFocusDescendents);

Perspex.Input/Navigation/TabNavigation.cs

@@ -161,6 +161,12 @@ namespace Perspex.Input.Navigation
                         }
                     }
                 }
+                else
+                {
+                    // TODO: Do a spatial search here if the container doesn't implement
+                    // INavigableContainer.
+                    element = null;
+                }
 
                 if (element != null && direction == FocusNavigationDirection.Previous)
                 {
@@ -193,6 +199,11 @@ namespace Perspex.Input.Navigation
 
             if (parent != null)
             {
+                if (direction == FocusNavigationDirection.Previous && parent.CanFocus())
+                {
+                    return parent;
+                }
+
                 var siblings = parent.GetVisualChildren()
                     .OfType<IInputElement>()
                     .Where(FocusExtensions.CanFocusDescendents);

Tests/Perspex.Input.UnitTests/KeyboardNavigationTests_Arrows.cs

@@ -621,6 +621,26 @@ namespace Perspex.Input.UnitTests
             Assert.Equal(next, result);
         }
 
+        [Fact]
+        public void Up_Continue_Returns_Parent()
+        {
+            Button current;
+
+            var top = new Decorator
+            {
+                Focusable = true,
+                [KeyboardNavigation.DirectionalNavigationProperty] = KeyboardNavigationMode.Continue,
+                Child = current = new Button
+                {
+                    Name = "Button",
+                }
+            };
+
+            var result = KeyboardNavigationHandler.GetNext(current, FocusNavigationDirection.Up);
+
+            Assert.Equal(top, result);
+        }
+
         [Fact]
         public void Up_Cycle_Returns_Up_Control_In_Container()
         {
@@ -777,7 +797,7 @@ namespace Perspex.Input.UnitTests
         }
 
         [Fact]
-        public void Up_Contained_Doesnt_Select_Child_Control()
+        public void Up_Contained_Doesnt_Return_Child_Control()
         {
             Decorator current;
 

Tests/Perspex.Input.UnitTests/KeyboardNavigationTests_Tab.cs

@@ -758,6 +758,25 @@ namespace Perspex.Input.UnitTests
             Assert.Equal(next, result);
         }
 
+        [Fact]
+        public void Previous_Continue_Returns_Parent()
+        {
+            Button current;
+
+            var top = new Decorator
+            {
+                Focusable = true,
+                Child = current = new Button
+                {
+                    Name = "Button",
+                }
+            };
+
+            var result = KeyboardNavigationHandler.GetNext(current, FocusNavigationDirection.Previous);
+
+            Assert.Equal(top, result);
+        }
+
         [Fact]
         public void Previous_Cycle_Returns_Previous_Control_In_Container()
         {