Added IsHitTestVisible property.

Perspex.Input/IInputElement.cs

@@ -33,6 +33,8 @@ namespace Perspex.Input
 
         bool IsFocused { get; }
 
+        bool IsHitTestVisible { get; }
+
         bool IsPointerOver { get; }
 
         void Focus();

Perspex.Input/IInputManager.cs

@@ -18,6 +18,6 @@ namespace Perspex.Input
 
         void Process(RawInputEventArgs e);
 
-        void SetPointerOver(IPointerDevice device, IVisual visual, Point p);
+        void SetPointerOver(IPointerDevice device, IInputElement element, Point p);
     }
 }

Perspex.Input/InputElement.cs

@@ -25,6 +25,9 @@ namespace Perspex.Input
         public static readonly PerspexProperty<bool> IsFocusedProperty =
             PerspexProperty.Register<InputElement, bool>("IsFocused", false);
 
+        public static readonly PerspexProperty<bool> IsHitTestVisibleProperty =
+            PerspexProperty.Register<InputElement, bool>("IsHitTestVisible", true);
+
         public static readonly PerspexProperty<bool> IsPointerOverProperty =
             PerspexProperty.Register<InputElement, bool>("IsPointerOver");
 
@@ -152,6 +155,12 @@ namespace Perspex.Input
             private set { this.SetValue(IsFocusedProperty, value); }
         }
 
+        public bool IsHitTestVisible
+        {
+            get { return this.GetValue(IsHitTestVisibleProperty); }
+            set { this.SetValue(IsHitTestVisibleProperty, value); }
+        }
+
         public bool IsPointerOver
         {
             get { return this.GetValue(IsPointerOverProperty); }
@@ -171,10 +180,7 @@ namespace Perspex.Input
 
         public IInputElement InputHitTest(Point p)
         {
-            return this.GetVisualsAt(p)
-                .OfType<IInputElement>()
-                .Where(x => x.IsEnabledCore)
-                .FirstOrDefault();
+            return this.GetInputElementsAt(p).FirstOrDefault();
         }
 
         public void Focus()

Perspex.Input/InputExtensions.cs

@@ -0,0 +1,38 @@
+// -----------------------------------------------------------------------
+// <copyright file="InputExtensions.cs" company="Steven Kirk">
+// Copyright 2015 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Input
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+
+    public static class InputExtensions
+    {
+        public static IEnumerable<IInputElement> GetInputElementsAt(this IInputElement element, Point p)
+        {
+            Contract.Requires<NullReferenceException>(element != null);
+
+            if (element.Bounds.Contains(p) && element.IsHitTestVisible && element.IsEnabledCore)
+            {
+                p -= element.Bounds.Position;
+
+                if (element.VisualChildren.Any())
+                {
+                    foreach (var child in element.VisualChildren.OfType<IInputElement>())
+                    {
+                        foreach (var result in child.GetInputElementsAt(p))
+                        {
+                            yield return result;
+                        }
+                    }
+                }
+
+                yield return element;
+            }
+        }
+    }
+}

Perspex.Input/InputManager.cs

@@ -46,11 +46,9 @@ namespace Perspex.Input
             this.rawEventReceived.OnNext(e);
         }
 
-        public void SetPointerOver(IPointerDevice device, IVisual visual, Point p)
+        public void SetPointerOver(IPointerDevice device, IInputElement element, Point p)
         {
-            IEnumerable<IInputElement> hits = visual.GetVisualsAt(p)
-                .OfType<IInputElement>()
-                .Where(x => x.IsEnabledCore);
+            IEnumerable<IInputElement> hits = element.GetInputElementsAt(p);
 
             foreach (var control in this.pointerOvers.Except(hits).ToList())
             {

Perspex.Input/Perspex.Input.csproj

@@ -68,6 +68,7 @@
     <Compile Include="IKeyboardDevice.cs" />
     <Compile Include="IMouseDevice.cs" />
     <Compile Include="InputElement.cs" />
+    <Compile Include="InputExtensions.cs" />
     <Compile Include="InputManager.cs" />
     <Compile Include="IPointerDevice.cs" />
     <Compile Include="Key.cs" />