WPF - DisableTouchpadAndWheelScrollLatching

In ChromiumWebBrowser disable by default when default call to Cef.Initialize

Issue #2408

Author: amaitland

CefSharp.Core/CefSettings.h

@@ -430,5 +430,18 @@ namespace CefSharp
                 _cefCommandLineArgs->Add("enable-begin-frame-scheduling", "1");
             }
         }
+
+		/// <summary>
+		/// Disable TouchpadAndWheelScrollLatching, Mouse Wheel becomes unreponsive after reload when
+		/// enabled. This is only required for WPF/OffScreen versions, see issue #2408
+		/// This is a short term workaround until the CEF issue is fixed.
+		/// </summary>
+		void DisableTouchpadAndWheelScrollLatching()
+		{
+			if (!_cefCommandLineArgs->ContainsKey("disable-features"))
+			{
+				_cefCommandLineArgs->Add("disable-features", "TouchpadAndWheelScrollLatching,AsyncWheelEvents");
+			}
+		}
     };
 }

CefSharp.Example/CefExample.cs

@@ -108,7 +108,9 @@ public static void Init(bool osr, bool multiThreadedMessageLoop, IBrowserProcess
                 settings.WindowlessRenderingEnabled = true;
 
                 //https://github.com/cefsharp/CefSharp/issues/2408
-                settings.CefCommandLineArgs.Add("disable-features", "TouchpadAndWheelScrollLatching,AsyncWheelEvents");
+                settings.DisableTouchpadAndWheelScrollLatching();
+                //This maybe required for scrolling overflow views in iframes 
+                //see https://bitbucket.org/chromiumembedded/cef/issues/2400/scroll-wheel-becomes-non-functional-with#comment-44369181
                 settings.CefCommandLineArgs.Add("disable-blink-features", "RootLayerScrolling");
 
                 //Disable Direct Composition to test https://github.com/cefsharp/CefSharp/issues/1634

CefSharp.Wpf/ChromiumWebBrowser.cs

@@ -433,9 +433,17 @@ public ChromiumWebBrowser()
         private void NoInliningConstructor()
         {
             //Initialize CEF if it hasn't already been initialized
-            if (!Cef.IsInitialized && !Cef.Initialize())
+            if (!Cef.IsInitialized)
             {
-                throw new InvalidOperationException("Cef::Initialize() failed");
+                //Disable TouchpadAndWheelScrollLatching
+                //Workaround for #2408
+                var settings = new CefSettings();
+                settings.DisableTouchpadAndWheelScrollLatching();
+
+                if (!Cef.Initialize(settings))
+                {
+                    throw new InvalidOperationException("Cef::Initialize() failed");
+                }
             }
 
             //Add this ChromiumWebBrowser instance to a list of IDisposable objects