Prep WebView and renderers for removal of InternalsVisibleTo (#120)

* Create custom event args class for script eval requests
Make IWebViewRenderer public

* Add IWebViewRenderer docs

* Add EvalRequested docs

* Move EvalRequested to Internals
IWebViewRenderer -> IWebViewDelegate

* Add docs

7 files changed, 24 insertions, 9 deletions

diff --git a/Xamarin.Forms.Core/HtmlWebViewSource.cs b/Xamarin.Forms.Core/HtmlWebViewSource.cs
index 157e5054..a5eccc96 100644
--- a/Xamarin.Forms.Core/HtmlWebViewSource.cs
+++ b/Xamarin.Forms.Core/HtmlWebViewSource.cs
@@ -20,7 +20,7 @@ namespace Xamarin.Forms
 			set { SetValue(HtmlProperty, value); }
 		}
 
-		internal override void Load(IWebViewRenderer renderer)
+		internal override void Load(IWebViewDelegate renderer)
 		{
 			renderer.LoadHtml(Html, BaseUrl);
 		}
diff --git a/Xamarin.Forms.Core/IWebViewRenderer.cs b/Xamarin.Forms.Core/IWebViewDelegate.cs
index 0b1b3db5..f6db223b 100644
--- a/Xamarin.Forms.Core/IWebViewRenderer.cs
+++ b/Xamarin.Forms.Core/IWebViewDelegate.cs
@@ -1,6 +1,6 @@
 namespace Xamarin.Forms
 {
-	internal interface IWebViewRenderer
+	public interface IWebViewDelegate
 	{
 		void LoadHtml(string html, string baseUrl);
 		void LoadUrl(string url);
diff --git a/Xamarin.Forms.Core/Internals/EvalRequested.cs b/Xamarin.Forms.Core/Internals/EvalRequested.cs
new file mode 100644
index 00000000..0f697922
--- /dev/null
+++ b/Xamarin.Forms.Core/Internals/EvalRequested.cs
@@ -0,0 +1,14 @@
+using System;
+
+namespace Xamarin.Forms.Internals
+{
+	public class EvalRequested : EventArgs
+	{
+		public string Script { get; }
+
+		public EvalRequested(string script)
+		{
+			Script = script;
+		}
+	}
+}
\ No newline at end of file
diff --git a/Xamarin.Forms.Core/UrlWebViewSource.cs b/Xamarin.Forms.Core/UrlWebViewSource.cs
index 72541045..12a0e408 100644
--- a/Xamarin.Forms.Core/UrlWebViewSource.cs
+++ b/Xamarin.Forms.Core/UrlWebViewSource.cs
@@ -11,7 +11,7 @@ namespace Xamarin.Forms
 			set { SetValue(UrlProperty, value); }
 		}
 
-		internal override void Load(IWebViewRenderer renderer)
+		internal override void Load(IWebViewDelegate renderer)
 		{
 			renderer.LoadUrl(Url);
 		}
diff --git a/Xamarin.Forms.Core/WebView.cs b/Xamarin.Forms.Core/WebView.cs
index 06a5f72c..8f28497c 100644
--- a/Xamarin.Forms.Core/WebView.cs
+++ b/Xamarin.Forms.Core/WebView.cs
@@ -1,4 +1,5 @@
 using System;
+using Xamarin.Forms.Internals;
 using Xamarin.Forms.Platform;
 
 namespace Xamarin.Forms
@@ -52,9 +53,8 @@ namespace Xamarin.Forms
 
 		public void Eval(string script)
 		{
-			EventHandler<EventArg<string>> handler = EvalRequested;
-			if (handler != null)
-				handler(this, new EventArg<string>(script));
+			EventHandler<EvalRequested> handler = EvalRequested;
+			handler?.Invoke(this, new EvalRequested(script));
 		}
 
 		public void GoBack()
@@ -103,7 +103,7 @@ namespace Xamarin.Forms
 			OnPropertyChanged(SourceProperty.PropertyName);
 		}
 
-		internal event EventHandler<EventArg<string>> EvalRequested;
+		internal event EventHandler<EvalRequested> EvalRequested;
 
 		internal event EventHandler GoBackRequested;
 
diff --git a/Xamarin.Forms.Core/WebViewSource.cs b/Xamarin.Forms.Core/WebViewSource.cs
index 6dc2635f..7b4c1bf7 100644
--- a/Xamarin.Forms.Core/WebViewSource.cs
+++ b/Xamarin.Forms.Core/WebViewSource.cs
@@ -21,7 +21,7 @@ namespace Xamarin.Forms
 				eh(this, EventArgs.Empty);
 		}
 
-		internal abstract void Load(IWebViewRenderer renderer);
+		internal abstract void Load(IWebViewDelegate renderer);
 
 		internal event EventHandler SourceChanged;
 	}
diff --git a/Xamarin.Forms.Core/Xamarin.Forms.Core.csproj b/Xamarin.Forms.Core/Xamarin.Forms.Core.csproj
index a4580fd6..a68ce579 100644
--- a/Xamarin.Forms.Core/Xamarin.Forms.Core.csproj
+++ b/Xamarin.Forms.Core/Xamarin.Forms.Core.csproj
@@ -93,6 +93,7 @@
     <Compile Include="ElementEventArgs.cs" />
     <Compile Include="ElementTemplate.cs" />
     <Compile Include="EmailKeyboard.cs" />
+    <Compile Include="Internals\EvalRequested.cs" />
     <Compile Include="ExportEffectAttribute.cs" />
     <Compile Include="ExpressionSearch.cs" />
     <Compile Include="FileAccess.cs" />
@@ -144,7 +145,7 @@
     <Compile Include="IValueProvider.cs" />
     <Compile Include="IViewController.cs" />
     <Compile Include="IVisualElementController.cs" />
-    <Compile Include="IWebViewRenderer.cs" />
+    <Compile Include="IWebViewDelegate.cs" />
     <Compile Include="IXamlTypeResolver.cs" />
     <Compile Include="IXmlLineInfoProvider.cs" />
     <Compile Include="KeyboardFlags.cs" />