1 files changed, 151 insertions, 0 deletions

diff --git a/Xamarin.Forms.Platform.iOS/ViewRenderer.cs b/Xamarin.Forms.Platform.iOS/ViewRenderer.cs
new file mode 100644
index 00000000..5b3be1c3
--- /dev/null
+++ b/Xamarin.Forms.Platform.iOS/ViewRenderer.cs
@@ -0,0 +1,151 @@
+using System;
+using System.Drawing;
+using System.ComponentModel;
+#if __UNIFIED__
+using UIKit;
+#else
+using MonoTouch.UIKit;
+#endif
+#if __UNIFIED__
+using RectangleF = CoreGraphics.CGRect;
+using SizeF = CoreGraphics.CGSize;
+using PointF = CoreGraphics.CGPoint;
+
+#else
+using nfloat=System.Single;
+using nint=System.Int32;
+using nuint=System.UInt32;
+#endif
+
+namespace Xamarin.Forms.Platform.iOS
+{
+	public abstract class ViewRenderer : ViewRenderer<View, UIView>
+	{
+	}
+
+	public abstract class ViewRenderer<TView, TNativeView> : VisualElementRenderer<TView> where TView : View where TNativeView : UIView
+	{
+		UIColor _defaultColor;
+
+		public TNativeView Control { get; private set; }
+
+		public override void LayoutSubviews()
+		{
+			base.LayoutSubviews();
+			if (Control != null)
+				Control.Frame = new RectangleF(0, 0, (nfloat)Element.Width, (nfloat)Element.Height);
+		}
+
+		public override SizeF SizeThatFits(SizeF size)
+		{
+			return Control.SizeThatFits(size);
+		}
+
+		protected override void Dispose(bool disposing)
+		{
+			base.Dispose(disposing);
+
+			if (disposing && Control != null)
+			{
+				Control.Dispose();
+				Control = null;
+			}
+		}
+
+		protected override void OnElementChanged(ElementChangedEventArgs<TView> e)
+		{
+			base.OnElementChanged(e);
+
+			if (e.OldElement != null)
+				e.OldElement.FocusChangeRequested -= ViewOnFocusChangeRequested;
+
+			if (e.NewElement != null)
+			{
+				if (Control != null && e.OldElement != null && e.OldElement.BackgroundColor != e.NewElement.BackgroundColor || e.NewElement.BackgroundColor != Color.Default)
+					SetBackgroundColor(e.NewElement.BackgroundColor);
+
+				e.NewElement.FocusChangeRequested += ViewOnFocusChangeRequested;
+			}
+
+			UpdateIsEnabled();
+		}
+
+		protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
+		{
+			if (Control != null)
+			{
+				if (e.PropertyName == VisualElement.IsEnabledProperty.PropertyName)
+					UpdateIsEnabled();
+				else if (e.PropertyName == VisualElement.BackgroundColorProperty.PropertyName)
+					SetBackgroundColor(Element.BackgroundColor);
+			}
+
+			base.OnElementPropertyChanged(sender, e);
+		}
+
+		protected override void OnRegisterEffect(PlatformEffect effect)
+		{
+			base.OnRegisterEffect(effect);
+			effect.Control = Control;
+		}
+
+		protected override void SetAutomationId(string id)
+		{
+			if (Control == null)
+				base.SetAutomationId(id);
+			else
+			{
+				AccessibilityIdentifier = id + "_Container";
+				Control.AccessibilityIdentifier = id;
+			}
+		}
+
+		protected override void SetBackgroundColor(Color color)
+		{
+			if (Control == null)
+				return;
+
+			if (color == Color.Default)
+				Control.BackgroundColor = _defaultColor;
+			else
+				Control.BackgroundColor = color.ToUIColor();
+		}
+
+		protected void SetNativeControl(TNativeView uiview)
+		{
+			_defaultColor = uiview.BackgroundColor;
+			Control = uiview;
+
+			if (Element.BackgroundColor != Color.Default)
+				SetBackgroundColor(Element.BackgroundColor);
+
+			UpdateIsEnabled();
+
+			AddSubview(uiview);
+		}
+
+		internal override void SendVisualElementInitialized(VisualElement element, UIView nativeView)
+		{
+			base.SendVisualElementInitialized(element, Control);
+		}
+
+		void UpdateIsEnabled()
+		{
+			if (Element == null || Control == null)
+				return;
+
+			var uiControl = Control as UIControl;
+			if (uiControl == null)
+				return;
+			uiControl.Enabled = Element.IsEnabled;
+		}
+
+		void ViewOnFocusChangeRequested(object sender, VisualElement.FocusRequestArgs focusRequestArgs)
+		{
+			if (Control == null)
+				return;
+
+			focusRequestArgs.Result = focusRequestArgs.Focus ? Control.BecomeFirstResponder() : Control.ResignFirstResponder();
+		}
+	}
+}
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