[Tizen] Added Fast Layout Opt-in (#13221)

Xamarin.Forms.Platform.Tizen/Forms.cs

@@ -42,6 +42,7 @@ public class InitializationOptions
 		public StaticRegistrarStrategy StaticRegistarStrategy { get; set; }
 		public PlatformType PlatformType { get; set; }
 		public bool UseMessagingCenter { get; set; } = true;
+		public bool UseFastLayout { get; set; } = false;
 
 		public DisplayResolutionUnit DisplayResolutionUnit { get; set; }
 
@@ -271,6 +272,8 @@ public static bool IsInitialized
 
 		public static bool UseSkiaSharp { get; private set; }
 
+		public static bool UseFastLayout { get; private set; }
+
 		public static DisplayResolutionUnit DisplayResolutionUnit { get; private set; }
 
 		public static int ScreenDPI => s_dpi.Value;
@@ -480,6 +483,7 @@ static void SetupInit(CoreApplication application, InitializationOptions options
 					s_platformType = options.PlatformType;
 					s_useMessagingCenter = options.UseMessagingCenter;
 					UseSkiaSharp = options.UseSkiaSharp;
+					UseFastLayout = options.UseFastLayout;
 
 					if (options.Assemblies != null && options.Assemblies.Length > 0)
 					{
@@ -532,6 +536,9 @@ static void SetupInit(CoreApplication application, InitializationOptions options
 
 							if (UseSkiaSharp)
 								RegisterSkiaSharpRenderers();
+
+							if (UseFastLayout)
+								Registrar.Registered.Register(typeof(Layout), typeof(FastLayoutRenderer));
 						}
 					}
 

Xamarin.Forms.Platform.Tizen/Native/EvasBox.cs

@@ -0,0 +1,131 @@
+using System;
+using System.Runtime.InteropServices;
+using ElmSharp;
+using EColor = ElmSharp.Color;
+using ERectangle = ElmSharp.Rectangle;
+
+namespace Xamarin.Forms.Platform.Tizen.Native
+{
+	public class EvasBox : Container
+	{
+		Interop.CanvasBoxLayoutCallback _layoutCallback;
+		Lazy<ERectangle> _rectangle;
+
+		public event EventHandler<LayoutEventArgs> LayoutUpdated;
+
+		public EvasBox(EvasObject parent) : base(parent)
+		{
+			_rectangle = new Lazy<ERectangle>(() =>
+			{
+				var rectangle = new ERectangle(this) { AlignmentX = -1, AlignmentY = -1, WeightX = 1, WeightY = 1 };
+				Interop.evas_object_box_insert_at(Handle, rectangle, 0);
+				rectangle.Lower();
+				rectangle.Show();
+				return rectangle;
+			});
+
+			SetLayoutCallback(() => { NotifyOnLayout(); });
+		}
+
+		public override EColor BackgroundColor
+		{
+			get
+			{
+				return _rectangle.Value.Color;
+			}
+			set
+			{
+				_rectangle.Value.Color = value.IsDefault ? EColor.Transparent : value;
+			}
+		}
+
+		public void PackEnd(EvasObject content)
+		{
+			Interop.evas_object_box_append(Handle, content);
+			AddChild(content);
+		}
+
+		public bool UnPack(EvasObject content)
+		{
+			var ret = Interop.evas_object_box_remove(Handle, content);
+			if (ret)
+				RemoveChild(content);
+			return ret;
+		}
+
+		public bool UnPackAll()
+		{
+			var ret = Interop.evas_object_box_remove_all(Handle, true);
+			if (ret)
+			{
+				ClearChildren();
+				if (_rectangle.IsValueCreated)
+				{
+					Interop.evas_object_box_append(Handle, _rectangle.Value);
+				}
+			}
+			return ret;
+		}
+
+		public void SetLayoutCallback(Action action)
+		{
+			_layoutCallback = (obj, priv, data) =>
+			{
+				if (_rectangle.IsValueCreated)
+				{
+					_rectangle.Value.Geometry = Geometry;
+				}
+				action();
+			};
+			Interop.evas_object_box_layout_set(Handle, _layoutCallback, IntPtr.Zero, null);
+		}
+
+		protected override IntPtr CreateHandle(EvasObject parent)
+		{
+			return Interop.evas_object_box_add(Interop.evas_object_evas_get(parent.Handle));
+		}
+
+		void NotifyOnLayout()
+		{
+			if (null != LayoutUpdated)
+			{
+				LayoutUpdated(this, new LayoutEventArgs() { Geometry = Geometry });
+			}
+		}
+
+		class Interop
+		{
+			public const string LibEvas = "libevas.so.1";
+
+			public delegate void CanvasBoxLayoutCallback(IntPtr obj, IntPtr priv, IntPtr userData);
+
+			public delegate void CanvasBoxDataFreeCallback(IntPtr data);
+
+			[DllImport(LibEvas)]
+			internal static extern IntPtr evas_object_box_add(IntPtr evas);
+
+			[DllImport(LibEvas)]
+			internal static extern IntPtr evas_object_evas_get(IntPtr obj);
+
+			[DllImport(LibEvas)]
+			internal static extern void evas_object_box_append(IntPtr obj, IntPtr child);
+
+			[DllImport(LibEvas)]
+			internal static extern void evas_object_box_insert_at(IntPtr obj, IntPtr child, int pos);
+
+			[DllImport(LibEvas)]
+			[return: MarshalAs(UnmanagedType.U1)]
+			internal static extern bool evas_object_box_remove(IntPtr obj, IntPtr child);
+
+			[DllImport(LibEvas)]
+			[return: MarshalAs(UnmanagedType.U1)]
+			internal static extern bool evas_object_box_remove_all(IntPtr obj, bool clear);
+
+			[DllImport(LibEvas)]
+			internal static extern void evas_object_box_layout_set(IntPtr obj, CanvasBoxLayoutCallback cb, IntPtr data, CanvasBoxDataFreeCallback dataFreeCb);
+
+			[DllImport(LibEvas)]
+			internal static extern void evas_object_box_layout_set(IntPtr obj, CanvasBoxLayoutCallback cb, IntPtr data, IntPtr dataFreeCb);
+		}
+	}
+}

Xamarin.Forms.Platform.Tizen/Native/EvasFormsCanvas.cs

@@ -0,0 +1,82 @@
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using ElmSharp;
+
+namespace Xamarin.Forms.Platform.Tizen.Native
+{
+	public class EvasFormsCanvas : EvasBox, IContainable<EvasObject>
+	{
+		public EvasFormsCanvas(EvasObject parent) : base(parent)
+		{
+			Initilize();
+		}
+
+		readonly ObservableCollection<EvasObject> _children = new ObservableCollection<EvasObject>();
+
+		public new IList<EvasObject> Children
+		{
+			get
+			{
+				return _children;
+			}
+		}
+
+		protected override void OnUnrealize()
+		{
+			foreach (var child in _children)
+			{
+				child.Unrealize();
+			}
+
+			base.OnUnrealize();
+		}
+
+		void Initilize()
+		{
+			_children.CollectionChanged += (o, e) =>
+			{
+				if (e.Action == NotifyCollectionChangedAction.Add)
+				{
+					foreach (var v in e.NewItems)
+					{
+						var view = v as EvasObject;
+						if (null != view)
+						{
+							OnAdd(view);
+						}
+					}
+				}
+				else if (e.Action == NotifyCollectionChangedAction.Remove)
+				{
+					foreach (var v in e.OldItems)
+					{
+						var view = v as EvasObject;
+						if (null != view)
+						{
+							OnRemove(view);
+						}
+					}
+				}
+				else if (e.Action == NotifyCollectionChangedAction.Reset)
+				{
+					OnRemoveAll();
+				}
+			};
+		}
+
+		void OnAdd(EvasObject view)
+		{
+			PackEnd(view);
+		}
+
+		void OnRemove(EvasObject view)
+		{
+			UnPack(view);
+		}
+
+		void OnRemoveAll()
+		{
+			UnPackAll();
+		}
+	}
+}

Xamarin.Forms.Platform.Tizen/Native/Page.cs

@@ -18,22 +18,29 @@ public class Page : Background, IContainable<EvasObject>
 		/// <summary>
 		/// Exposes the Children property, mapping it to the _canvas' Children property.
 		/// </summary>
-		public new IList<EvasObject> Children => _canvas.Children;
+		public new IList<EvasObject> Children => Forms.UseFastLayout ? EvasFormsCanvas?.Children : Canvas?.Children;
 
 		/// <summary>
 		/// The canvas, used as a container for other objects.
 		/// </summary>
 		/// <remarks>
 		/// The canvas holds all the Views that the ContentPage is composed of.
 		/// </remarks>
-		internal Canvas _canvas;
+		internal Container _canvas;
+
+		EvasFormsCanvas EvasFormsCanvas => _canvas as EvasFormsCanvas;
+
+		Canvas Canvas => _canvas as Canvas;
 
 		/// <summary>
 		/// Initializes a new instance of the ContentPage class.
 		/// </summary>
 		public Page(EvasObject parent) : base(parent)
 		{
-			_canvas = new Canvas(this);
+			if (Forms.UseFastLayout)
+				_canvas = new EvasFormsCanvas(this);
+			else
+				_canvas = new Canvas(this);
 			this.SetOverlayPart(_canvas);
 		}
 
@@ -44,11 +51,18 @@ public Page(EvasObject parent) : base(parent)
 		{
 			add
 			{
-				_canvas.LayoutUpdated += value;
+				if (Forms.UseFastLayout)
+					EvasFormsCanvas.LayoutUpdated += value;
+				else
+					Canvas.LayoutUpdated += value;
+
 			}
 			remove
 			{
-				_canvas.LayoutUpdated -= value;
+				if (Forms.UseFastLayout)
+					EvasFormsCanvas.LayoutUpdated -= value;
+				else
+					Canvas.LayoutUpdated -= value;
 			}
 		}