Implement Focused property

CefSharp.WinForms/ChromiumWebBrowser.cs

@@ -344,6 +344,32 @@ public Task<string> GetTextAsync()
             return taskStringVisitor.Task;
         }
 
+        /// <summary>
+        /// Manually implement Focused because cef does not implement it.
+        /// </summary>
+        /// <remarks>
+        /// This is also how the Microsoft's WebBrowserControl implements the Focused property.
+        /// </remarks>
+        public override bool Focused
+        {
+            get
+            {
+                if (base.Focused)
+                {
+                    return true;
+                }
+
+                if (!IsHandleCreated)
+                {
+                    return false;
+                }
+
+                // Ask Windows which control has the focus and then check if it's one of our children
+                IntPtr focus = User32.GetFocus();
+                return focus != IntPtr.Zero && User32.IsChild(Handle, focus);
+            }
+        }
+
         protected override void OnSizeChanged(EventArgs e)
         {
             base.OnSizeChanged(e);

CefSharp/CefSharp.csproj

@@ -89,6 +89,7 @@
   </ItemGroup>
   <ItemGroup>
     <Compile Include="CefFileDialogMode.cs" />
+    <Compile Include="Internals\User32.cs" />
     <Compile Include="IsBrowserInitializedChangedEventArgs.cs" />
     <Compile Include="CefTerminationStatus.cs" />
     <Compile Include="IDialogHandler.cs" />

CefSharp/Internals/User32.cs

@@ -0,0 +1,18 @@
+// Copyright © 2010-2014 The CefSharp Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license that can be found in the LICENSE file.
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace CefSharp.Internals
+{
+    public static class User32
+    {
+        [DllImport("User32.dll")]
+        public extern static IntPtr GetFocus();
+
+        [DllImport("user32.dll")]
+        public extern static bool IsChild(IntPtr parent, IntPtr child);
+    }
+}