Added some Control tests.

Perspex.UnitTests/Controls/ControlTests.cs

@@ -0,0 +1,105 @@
+// -----------------------------------------------------------------------
+// <copyright file="ControlTests.cs" company="Steven Kirk">
+// Copyright 2013 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.UnitTests.Controls
+{
+    using System.Linq;
+    using Microsoft.VisualStudio.TestTools.UnitTesting;
+    using Moq;
+    using Perspex.Controls;
+    using Perspex.Layout;
+    using Perspex.Styling;
+    using Splat;
+
+    [TestClass]
+    public class ControlTests
+    {
+        [TestMethod]
+        public void Classes_Should_Initially_Be_Empty()
+        {
+            var target = new Control();
+
+            Assert.AreEqual(0, target.Classes.Count);
+        }
+
+        [TestMethod]
+        public void Setting_IsMouseOver_Should_Add_Mouseover_Class()
+        {
+            var target = new Control();
+
+            target.IsMouseOver = true;
+
+            CollectionAssert.AreEqual(new[] { ":mouseover" }, target.Classes.ToArray());
+        }
+
+        [TestMethod]
+        public void Clearing_IsMouseOver_Should_Remove_Mouseover_Class()
+        {
+            var target = new Control();
+
+            target.IsMouseOver = true;
+            target.IsMouseOver = false;
+
+            Assert.AreEqual(0, target.Classes.Count);
+        }
+
+        [TestMethod]
+        public void Adding_Control_To_ILayoutRoot_Should_Style_Control()
+        {
+            using (Locator.CurrentMutable.WithResolver())
+            {
+                var root = new TestRoot();
+                var target = new Control();
+                var styler = new Mock<IStyler>();
+
+                Locator.CurrentMutable.Register(() => styler.Object, typeof(IStyler));
+
+                root.Content = target;
+
+                styler.Verify(x => x.ApplyStyles(target), Times.Once());
+            }
+        }
+
+        [TestMethod]
+        public void Adding_Tree_To_ILayoutRoot_Should_Style_Controls()
+        {
+            using (Locator.CurrentMutable.WithResolver())
+            {
+                var root = new TestRoot();
+                var parent = new Border();
+                var child = new Border();
+                var grandchild = new Control();
+                var styler = new Mock<IStyler>();
+
+                Locator.CurrentMutable.Register(() => styler.Object, typeof(IStyler));
+
+                parent.Content = child;
+                child.Content = grandchild;
+
+                styler.Verify(x => x.ApplyStyles(It.IsAny<IStyleable>()), Times.Never());
+
+                root.Content = parent;
+
+                styler.Verify(x => x.ApplyStyles(parent), Times.Once());
+                styler.Verify(x => x.ApplyStyles(child), Times.Once());
+                styler.Verify(x => x.ApplyStyles(grandchild), Times.Once());
+            }
+        }
+
+        private class TestRoot : Decorator, ILayoutRoot
+        {
+            public Size ClientSize
+            {
+                get { throw new System.NotImplementedException(); }
+            }
+
+            public ILayoutManager LayoutManager
+            {
+                get { throw new System.NotImplementedException(); }
+            }
+        }
+    }
+}

Perspex.UnitTests/Perspex.UnitTests.csproj

@@ -68,6 +68,7 @@
     </Otherwise>
   </Choose>
   <ItemGroup>
+    <Compile Include="Controls\ControlTests.cs" />
     <Compile Include="PerspexPropertyTests.cs" />
     <Compile Include="Properties\AssemblyInfo.cs" />
     <Compile Include="PerspexObjectTests.cs" />

Perspex/Controls/Control.cs

@@ -15,6 +15,7 @@ namespace Perspex.Controls
     using Perspex.Layout;
     using Perspex.Media;
     using Perspex.Styling;
+    using Splat;
 
     public enum HorizontalAlignment
     {
@@ -32,7 +33,7 @@ namespace Perspex.Controls
         Bottom,
     }
 
-    public abstract class Control : Interactive, ILayoutable, IStyleable
+    public class Control : Interactive, ILayoutable, IStyleable, IStyled
     {
         public static readonly PerspexProperty<Brush> BackgroundProperty =
             PerspexProperty.Register<Control, Brush>("Background", inherits: true);
@@ -291,26 +292,16 @@ namespace Perspex.Controls
             return finalSize;
         }
 
-        protected abstract Size MeasureContent(Size availableSize);
-
-        protected override void AttachedToVisualTree()
+        protected virtual Size MeasureContent(Size availableSize)
         {
-            this.AttachStyles(this);
-            base.AttachedToVisualTree();
+            return new Size();
         }
 
-        private void AttachStyles(Control styleContainer)
+        protected override void AttachedToVisualTree()
         {
-            if (styleContainer != null)
-            {
-                Control parent = styleContainer.Parent;
-                this.AttachStyles(parent);
-                styleContainer.Styles.Attach(this);
-            }
-            else
-            {
-                Application.Current.Styles.Attach(this);
-            }
+            IStyler styler = Locator.Current.GetService<IStyler>();
+            styler.ApplyStyles(this);
+            base.AttachedToVisualTree();
         }
     }
 }

Perspex/Perspex.csproj

@@ -86,6 +86,9 @@
     <Compile Include="Interactive.cs" />
     <Compile Include="IObservableDescription.cs" />
     <Compile Include="IVisual.cs" />
+    <Compile Include="Styling\IStyler.cs" />
+    <Compile Include="Styling\Styler.cs" />
+    <Compile Include="Styling\IStyled.cs" />
     <Compile Include="Styling\StyleActivator.cs" />
     <Compile Include="Styling\IStyleable.cs" />
     <Compile Include="Styling\IStyle.cs" />

Perspex/Styling/IStyled.cs

@@ -0,0 +1,15 @@
+// -----------------------------------------------------------------------
+// <copyright file="IStyled.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Styling
+{
+    using Perspex.Controls;
+
+    public interface IStyled
+    {
+        Styles Styles { get; }
+    }
+}

Perspex/Styling/IStyler.cs

@@ -0,0 +1,15 @@
+// -----------------------------------------------------------------------
+// <copyright file="Styler.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Styling
+{
+    using System;
+
+    public interface IStyler
+    {
+        void ApplyStyles(IStyleable control);
+    }
+}

Perspex/Styling/Styler.cs

@@ -0,0 +1,24 @@
+// -----------------------------------------------------------------------
+// <copyright file="Styler.cs" company="Steven Kirk">
+// Copyright 2014 MIT Licence. See licence.md for more information.
+// </copyright>
+// -----------------------------------------------------------------------
+
+namespace Perspex.Styling
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Linq;
+    using System.Text;
+    using System.Threading.Tasks;
+
+    public class Styler : IStyler
+    {
+        public void ApplyStyles(IStyleable control)
+        {
+            IVisual visual = control as IVisual;
+            IStyled styleContainer = visual.GetVisualAncestorOrSelf<IStyled>();
+            styleContainer.Styles.Attach(control);
+        }
+    }
+}

Perspex/VisualExtensions.cs

@@ -32,6 +32,13 @@ namespace Perspex
             return null;
         }
 
+        public static T GetVisualAncestorOrSelf<T>(this IVisual visual) where T : class
+        {
+            Contract.Requires<NullReferenceException>(visual != null);
+
+            return (visual as T) ?? visual.GetVisualAncestor<T>();
+        }
+
         public static IVisual GetVisualAt(this IVisual visual, Point p)
         {
             Contract.Requires<NullReferenceException>(visual != null);

TestApplication/Program.cs

@@ -61,13 +61,13 @@ namespace TestApplication
                                 new Setter(TestBorder.BackgroundProperty, new SolidColorBrush(0xff0000ff)),
                             }
                         },
-                        //new Style(new Selector().OfType<TestBorder>().Class(":mouseover"))
-                        //{
-                        //    Setters = new[]
-                        //    {
-                        //        new Setter(TestBorder.BackgroundProperty, new SolidColorBrush(0xffff0000)),
-                        //    }
-                        //},
+                        new Style(new Selector().OfType<TestBorder>().Class(":mouseover"))
+                        {
+                            Setters = new[]
+                            {
+                                new Setter(TestBorder.BackgroundProperty, new SolidColorBrush(0xffff0000)),
+                            }
+                        },
                     }
                 },