Platform Specifics (#301)

* Playing around with how the platform specifics interfaces etc. might work

* Sample implementation of iOS navigation translucency

* Very slightly reduced code

* Better vendor stuff

* Drop single-implemenation interfaces

* Generics on NavigationPage

* On-demand vendor stuff

* Remove functionally duplicate classes and make ControlGallery work again

* Namespace all the things. XAML test.

* Can use Effect to attach platform specific

* Attach Effect on PropertyChanging for XAML support!

* Rename IConfigPlatform interfaces for readability

* Some renaming to match the documents

* Split class files

* Clear out test-only code

* Re-namespace

* Added On method to rendered Elements

* Allow for removal of platform suffix, convenience methods on specific platforms

* Creating a gallery page for specifics

* Add rudimentary Platform Specifics gallery; make CollapseStyle work on UWP;
Add CollapsedPaneWidth specific property

* Toolbar now working with both collapse styles

* MDP now displaying Content title; toolbar routing around title

* Add a gallery for the iOS NavigationPage stuff

* Add Navigation Page as detail page to verify it works with new Toolbar options

* Make titlebar/toolbar background colors consistent

* ToolbarPlacement now working on NavigationPage

* Toolbar Placement working for tabbed and nav pages

* Fix bug where phone doesn't get default toolbar placement on start

* [Core] Add PS WindowSoftInputModeAdjust

[Core] Make Application extendable

* Toolbar placement now working on Nav, Tabbed, and Master pages on desktop/phone

Remove unnecessary style indirection

Fix build errors

* [A] Add PlatformConfigurationExtensions

* SetSoftInputMode test page

* [A] SetSoftInputMode

Known issue: Status bar color does not work in AdjustResize mode

* [Core] Add PS Blur

* [iOS] Configure renderer for blur

* Add test page

* Move to blur VisualElement for broader support

* Move test pages to gallery

* Update docs

* Use lazy initializer for PlatformConfigurationRegistry

1 files changed, 60 insertions, 0 deletions

diff --git a/Xamarin.Forms.Platform.iOS/VisualElementRenderer.cs b/Xamarin.Forms.Platform.iOS/VisualElementRenderer.cs
index ab212b21..d4da0930 100644
--- a/Xamarin.Forms.Platform.iOS/VisualElementRenderer.cs
+++ b/Xamarin.Forms.Platform.iOS/VisualElementRenderer.cs
@@ -4,6 +4,8 @@ using System.Collections.ObjectModel;
 using System.Collections.Specialized;
 using System.Drawing;
 using System.ComponentModel;
+using Xamarin.Forms.PlatformConfiguration.iOSSpecific;
+
 #if __UNIFIED__
 using UIKit;
 #else
@@ -13,6 +15,7 @@ using MonoTouch.UIKit;
 using RectangleF = CoreGraphics.CGRect;
 using SizeF = CoreGraphics.CGSize;
 using PointF = CoreGraphics.CGPoint;
+using CoreGraphics;
 
 #else
 using nfloat=System.Single;
@@ -44,6 +47,9 @@ namespace Xamarin.Forms.Platform.iOS
 		VisualElementPackager _packager;
 		VisualElementTracker _tracker;
 
+		UIVisualEffectView _blur;
+		BlurEffectStyle _previousBlur;
+
 		protected VisualElementRenderer() : base(RectangleF.Empty)
 		{
 			_propertyChangedHandler = OnElementPropertyChanged;
@@ -180,6 +186,17 @@ namespace Xamarin.Forms.Platform.iOS
 			return new SizeF(0, 0);
 		}
 
+		public override void Draw(RectangleF rect)
+		{
+			base.Draw(rect);
+			if (_blur != null)
+			{
+				_blur.Frame = rect;
+				if (_blur.Superview == null)
+					Superview.Add(_blur);
+			}
+		}
+
 		protected override void Dispose(bool disposing)
 		{
 			if ((_flags & VisualElementRendererFlags.Disposed) != 0)
@@ -220,6 +237,9 @@ namespace Xamarin.Forms.Platform.iOS
 			var changed = ElementChanged;
 			if (changed != null)
 				changed(this, e);
+
+			if (e.NewElement != null)
+				SetBlur((BlurEffectStyle)e.NewElement.GetValue(PlatformConfiguration.iOSSpecific.VisualElement.BlurEffectProperty));
 		}
 
 		protected virtual void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
@@ -228,6 +248,8 @@ namespace Xamarin.Forms.Platform.iOS
 				SetBackgroundColor(Element.BackgroundColor);
 			else if (e.PropertyName == Layout.IsClippedToBoundsProperty.PropertyName)
 				UpdateClipToBounds();
+			else if (e.PropertyName == PlatformConfiguration.iOSSpecific.VisualElement.BlurEffectProperty.PropertyName)
+				SetBlur((BlurEffectStyle)Element.GetValue(PlatformConfiguration.iOSSpecific.VisualElement.BlurEffectProperty));
 		}
 
 		protected virtual void OnRegisterEffect(PlatformEffect effect)
@@ -248,6 +270,44 @@ namespace Xamarin.Forms.Platform.iOS
 				BackgroundColor = color.ToUIColor();
 		}
 
+		protected virtual void SetBlur(BlurEffectStyle blur)
+		{
+			if (_previousBlur == blur)
+				return;
+
+			_previousBlur = blur;
+
+			if (_blur != null)
+			{
+				_blur.RemoveFromSuperview();
+				_blur = null;
+			}
+
+			if (blur == BlurEffectStyle.None)
+			{
+				SetNeedsDisplay();
+				return;
+			}
+
+			UIBlurEffect blurEffect;
+			switch (blur)
+			{
+				default:
+				case BlurEffectStyle.ExtraLight:
+					blurEffect = UIBlurEffect.FromStyle(UIBlurEffectStyle.ExtraLight);
+					break;
+				case BlurEffectStyle.Light:
+					blurEffect = UIBlurEffect.FromStyle(UIBlurEffectStyle.Light);
+					break;
+				case BlurEffectStyle.Dark:
+					blurEffect = UIBlurEffect.FromStyle(UIBlurEffectStyle.Dark);
+					break;
+			}
+
+			_blur = new UIVisualEffectView(blurEffect);
+			SetNeedsDisplay();
+		}
+
 		protected virtual void UpdateNativeWidget()
 		{
 		}