Started adding mouse capture.

Not yet released properly.

Perspex.Windows/Input/MouseDevice.cs

@@ -12,16 +12,15 @@ namespace Perspex.Windows.Input
 
     public class MouseDevice : IMouseDevice
     {
-        public IVisual Captured
+        public Interactive Captured
         {
             get;
             private set;
         }
 
-        public IDisposable Capture(IVisual visual)
+        public void Capture(Interactive visual)
         {
             this.Captured = visual;
-            return Disposable.Create(() => this.Captured = null);
         }
     }
 }

Perspex/Classes.cs

@@ -128,6 +128,11 @@ namespace Perspex
             return inner.GetEnumerator();
         }
 
+        public override string ToString()
+        {
+            return string.Join(" ", this);
+        }
+
         IEnumerator IEnumerable.GetEnumerator()
         {
             return inner.GetEnumerator();

Perspex/Controls/Button.cs

@@ -12,15 +12,17 @@ namespace Perspex.Controls
     {
         public Button()
         {
-            this.GetObservable(PointerPressedEvent).Subscribe(e =>
+            this.PointerPressed += (s, e) =>
             {
                 this.Classes.Add(":pressed");
-            });
+                e.Device.Capture(this);
+            };
 
-            this.GetObservable(PointerReleasedEvent).Subscribe(e =>
+            this.PointerReleased += (s, e) =>
             {
+                e.Device.Capture(null);
                 this.Classes.Remove(":pressed");
-            });
+            };
         }
     }
 }

Perspex/Input/IInputManager.cs

@@ -7,6 +7,7 @@
 namespace Perspex.Input
 {
     using Perspex.Input.Raw;
+    using Perspex.Layout;
 
     public interface IInputManager
     {

Perspex/Input/IPointerDevice.cs

@@ -10,8 +10,8 @@ namespace Perspex.Input
 
     public interface IPointerDevice : IInputDevice
     {
-        IVisual Captured { get; }
+        Interactive Captured { get; }
 
-        IDisposable Capture(IVisual visual);
+        void Capture(Interactive visual);
     }
 }

Perspex/Input/InputManager.cs

@@ -43,34 +43,37 @@ namespace Perspex.Input
 
         private void MouseMove(IMouseDevice device, IVisual visual, Point p)
         {
-            IEnumerable<IVisual> hits = visual.GetVisualsAt(p);
-
-            foreach (var control in this.pointerOvers.ToList().Except(hits).Cast<Control>())
+            if (device.Captured == null)
             {
-                PointerEventArgs e = new PointerEventArgs
+                IEnumerable<IVisual> hits = visual.GetVisualsAt(p);
+
+                foreach (var control in this.pointerOvers.ToList().Except(hits).Cast<Control>())
                 {
-                    RoutedEvent = Control.PointerLeaveEvent,
-                    Device = device,
-                    OriginalSource = control,
-                    Source = control,
-                };
-
-                this.pointerOvers.Remove(control);
-                control.RaiseEvent(e);
-            }
+                    PointerEventArgs e = new PointerEventArgs
+                    {
+                        RoutedEvent = Control.PointerLeaveEvent,
+                        Device = device,
+                        OriginalSource = control,
+                        Source = control,
+                    };
 
-            foreach (var control in hits.Except(this.pointerOvers).Cast<Control>())
-            {
-                PointerEventArgs e = new PointerEventArgs
+                    this.pointerOvers.Remove(control);
+                    control.RaiseEvent(e);
+                }
+
+                foreach (var control in hits.Except(this.pointerOvers).Cast<Control>())
                 {
-                    RoutedEvent = Control.PointerEnterEvent,
-                    Device = device,
-                    OriginalSource = control,
-                    Source = control,
-                };
-
-                this.pointerOvers.Add(control);
-                control.RaiseEvent(e);
+                    PointerEventArgs e = new PointerEventArgs
+                    {
+                        RoutedEvent = Control.PointerEnterEvent,
+                        Device = device,
+                        OriginalSource = control,
+                        Source = control,
+                    };
+
+                    this.pointerOvers.Add(control);
+                    control.RaiseEvent(e);
+                }
             }
         }
 
@@ -80,7 +83,7 @@ namespace Perspex.Input
 
             if (hit != null)
             {
-                Interactive source = (hit as Interactive) ?? hit.GetVisualAncestor<Interactive>();
+                Interactive source = device.Captured ?? (hit as Interactive) ?? hit.GetVisualAncestor<Interactive>();
 
                 if (source != null)
                 {
@@ -101,7 +104,7 @@ namespace Perspex.Input
 
             if (hit != null)
             {
-                Interactive source = (hit as Interactive) ?? hit.GetVisualAncestor<Interactive>();
+                Interactive source = device.Captured ?? (hit as Interactive) ?? hit.GetVisualAncestor<Interactive>();
 
                 if (source != null)
                 {