[iOS] Add YogaKit implementation using C#

2016-12-10 19:11:22 +00:00
parent 00e862173c
commit b88fa7ee7b
4 changed files with 369 additions and 0 deletions
--- a/csharp/Facebook.Yoga/ios/Facebook.Yoga.iOS.sln
+++ b/csharp/Facebook.Yoga/ios/Facebook.Yoga.iOS.sln
@@ -5,6 +5,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Facebook.Yoga.iOS", "Facebo
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Facebook.Yoga.iOS.Test", "Facebook.Yoga.iOS.Test\Facebook.Yoga.iOS.Test.csproj", "{3B27656A-129D-4779-BDAD-1A088DFDD9C5}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Facebook.YogaKit.iOS", "Facebook.YogaKit.iOS\Facebook.YogaKit.iOS.csproj", "{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -39,5 +41,17 @@ Global
 		{3B27656A-129D-4779-BDAD-1A088DFDD9C5}.Release|iPhoneSimulator.Build.0 = Release|iPhoneSimulator
 		{3B27656A-129D-4779-BDAD-1A088DFDD9C5}.Debug|iPhone.ActiveCfg = Debug|iPhone
 		{3B27656A-129D-4779-BDAD-1A088DFDD9C5}.Debug|iPhone.Build.0 = Debug|iPhone
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|Any CPU.Build.0 = Release|Any CPU
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|iPhoneSimulator.ActiveCfg = Debug|Any CPU
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|iPhoneSimulator.Build.0 = Debug|Any CPU
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|iPhone.ActiveCfg = Release|Any CPU
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|iPhone.Build.0 = Release|Any CPU
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|iPhoneSimulator.ActiveCfg = Release|Any CPU
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Release|iPhoneSimulator.Build.0 = Release|Any CPU
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|iPhone.ActiveCfg = Debug|Any CPU
+		{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}.Debug|iPhone.Build.0 = Debug|Any CPU
 	EndGlobalSection
 EndGlobal
--- a/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/Facebook.YogaKit.iOS.csproj
+++ b/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/Facebook.YogaKit.iOS.csproj
@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{33B1B6BE-F415-4819-A5FB-CFFE2E40AD6E}</ProjectGuid>
+    <ProjectTypeGuids>{FEACFBD2-3405-455C-9665-78FE426C6842};{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}</ProjectTypeGuids>
+    <OutputType>Library</OutputType>
+    <RootNamespace>Facebook.YogaKit.iOS</RootNamespace>
+    <AssemblyName>Facebook.YogaKit.iOS</AssemblyName>
+    <IPhoneResourcePrefix>Resources</IPhoneResourcePrefix>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug</OutputPath>
+    <DefineConstants>DEBUG;</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <CodesignKey>iPhone Developer</CodesignKey>
+    <MtouchDebug>true</MtouchDebug>
+    <MtouchFastDev>true</MtouchFastDev>
+    <MtouchProfiling>true</MtouchProfiling>
+    <MtouchUseSGen>true</MtouchUseSGen>
+    <MtouchUseRefCounting>true</MtouchUseRefCounting>
+    <IOSDebuggerPort>51303</IOSDebuggerPort>
+    <DeviceSpecificBuild>false</DeviceSpecificBuild>
+    <MtouchLink></MtouchLink>
+    <MtouchHttpClientHandler></MtouchHttpClientHandler>
+    <MtouchTlsProvider></MtouchTlsProvider>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release</OutputPath>
+    <DefineConstants></DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+    <CodesignKey>iPhone Developer</CodesignKey>
+    <MtouchUseSGen>true</MtouchUseSGen>
+    <MtouchUseRefCounting>true</MtouchUseRefCounting>
+    <MtouchLink>SdkOnly</MtouchLink>
+    <MtouchHttpClientHandler></MtouchHttpClientHandler>
+    <MtouchTlsProvider></MtouchTlsProvider>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Xml" />
+    <Reference Include="System.Core" />
+    <Reference Include="Xamarin.iOS" />
+  </ItemGroup>
+  <ItemGroup>
+    <Folder Include="Resources\" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="YogaKit.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\Facebook.Yoga.iOS.csproj">
+      <Project>{BE4CBFDA-02E2-4DF0-A81A-CEFB7987A708}</Project>
+      <Name>Facebook.Yoga.iOS</Name>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(MSBuildExtensionsPath)\Xamarin\iOS\Xamarin.iOS.CSharp.targets" />
+</Project>
--- a/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/Properties/AssemblyInfo.cs
+++ b/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/Properties/AssemblyInfo.cs
@@ -0,0 +1,26 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+
+// Information about this assembly is defined by the following attributes. 
+// Change them to the values specific to your project.
+
+[assembly: AssemblyTitle("Facebook.YogaKit.iOS")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("")]
+[assembly: AssemblyCopyright("rmarinho")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// The assembly version has the format "{Major}.{Minor}.{Build}.{Revision}".
+// The form "{Major}.{Minor}.*" will automatically update the build and revision,
+// and "{Major}.{Minor}.{Build}.*" will update just the revision.
+
+[assembly: AssemblyVersion("1.0.*")]
+
+// The following attributes are used to specify the signing key for the assembly, 
+// if desired. See the Mono documentation for more information about signing.
+
+//[assembly: AssemblyDelaySign(false)]
+//[assembly: AssemblyKeyFile("")]
--- a/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/YogaKit.cs
+++ b/csharp/Facebook.Yoga/ios/Facebook.YogaKit.iOS/YogaKit.cs
@@ -0,0 +1,262 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using CoreGraphics;
+using Facebook.Yoga;
+using Foundation;
+using UIKit;
+
+namespace Facebook.YogaKit.iOS
+{
+	class YGNodeBridge : NSObject
+	{
+		internal WeakReference<UIView> viewRef;
+		internal YogaNode node;
+		public YGNodeBridge()
+		{
+			node = new YogaNode();
+		}
+
+		public void SetContext(UIView view)
+		{
+			viewRef = new WeakReference<UIView>(view);
+			YogaKit.Bridges.Add(node, this);
+		}
+	}
+
+	public static class YogaKit
+	{
+
+		internal static Dictionary<YogaNode, YGNodeBridge> Bridges = new Dictionary<YogaNode, YGNodeBridge>();
+
+		static NSString YogaNodeKey = new NSString(nameof(GetYogaNode));
+
+		static NSString UsesYogaKey = new NSString(nameof(UsesYoga));
+
+		static NSString IncludeYogaKey = new NSString(nameof(UsesYoga));
+
+		public static void UsesYoga(this UIView view, bool usesYoga)
+		{
+			var value = NSNumber.FromBoolean(usesYoga);
+			objc_setAssociatedObject(view.Handle, UsesYogaKey.Handle, value.Handle, AssociationPolicy.RETAIN_NONATOMIC);
+		}
+
+		public static bool GetUsesYoga(this UIView view)
+		{
+			var value = ObjCRuntime.Runtime.GetNSObject(objc_getAssociatedObject(view.Handle, UsesYogaKey.Handle)) as NSNumber;
+			return value == null ? false : value.BoolValue;
+		}
+
+		public static void IncludeYogaLayout(this UIView view, bool includeInLayout)
+		{
+			var value = NSNumber.FromBoolean(includeInLayout);
+			objc_setAssociatedObject(view.Handle, IncludeYogaKey.Handle, value.Handle, AssociationPolicy.RETAIN_NONATOMIC);
+		}
+
+		public static bool GetIncludeYogaLayout(this UIView view)
+		{
+			var value = ObjCRuntime.Runtime.GetNSObject(objc_getAssociatedObject(view.Handle, IncludeYogaKey.Handle)) as NSNumber;
+			return value == null ? true : value.BoolValue;
+		}
+
+		public static void YogaWidth(this UIView view, nfloat width)
+		{
+			var node = GetYogaNode(view);
+			node.Width = (float)width;
+		}
+
+		public static void YogaHeight(this UIView view, nfloat height)
+		{
+			var node = GetYogaNode(view);
+			node.Height = (float)height;
+		}
+
+		public static void YogaAlignItems(this UIView view, Yoga.YogaAlign align)
+		{
+			var node = GetYogaNode(view);
+			node.AlignItems = align;
+		}
+
+		public static void YogaJustify(this UIView view, Yoga.YogaJustify justify)
+		{
+			var node = GetYogaNode(view);
+			node.JustifyContent = justify;
+		}
+
+		public static void YogaApplyLayout(this UIView view)
+		{
+			CalculateLayoutWithSize(view, view.Bounds.Size);
+			ApplyLayoutToViewHierarchy(view);
+		}
+
+		static CGSize CalculateLayoutWithSize(UIView view, CGSize size)
+		{
+			if (!view.GetUsesYoga())
+			{
+				System.Diagnostics.Debug.WriteLine("Doesn't use Yoga");
+			}
+			AttachNodesFromViewHierachy(view);
+			var node = GetYogaNode(view);
+
+			node.Width = (float)size.Width;
+			node.Height = (float)size.Height;
+			node.CalculateLayout();
+
+			return new CGSize { Width = node.LayoutWidth, Height = node.LayoutHeight };
+		}
+
+		static long MeasureView(YogaNode node, float width, YogaMeasureMode widthMode, float height, YogaMeasureMode heightMode)
+		{
+			var constrainedWidth = (widthMode == YogaMeasureMode.Undefined) ? nfloat.MaxValue : width;
+			var constrainedHeight = (heightMode == YogaMeasureMode.Undefined) ? nfloat.MaxValue : height;
+
+			UIView view = null;
+			if (Bridges.ContainsKey(node))
+				Bridges[node].viewRef.TryGetTarget(out view);
+
+			var sizeThatFits = view.SizeThatFits(new CGSize(constrainedWidth, constrainedHeight));
+
+			var finalWidth = SanitizeMeasurement(constrainedWidth, sizeThatFits.Width, widthMode);
+			var finalHeight = SanitizeMeasurement(constrainedHeight, sizeThatFits.Height, heightMode);
+
+			return MeasureOutput.Make(finalWidth, finalHeight);
+		}
+
+		static float SanitizeMeasurement(nfloat constrainedSize, nfloat measuredSize, YogaMeasureMode measureMode)
+		{
+			float result;
+			if (measureMode == YogaMeasureMode.Exactly)
+			{
+				result = (float)constrainedSize;
+			}
+			else if (measureMode == YogaMeasureMode.AtMost)
+			{
+				result = (float)Math.Min(constrainedSize, measuredSize);
+			}
+			else {
+				result = (float)measuredSize;
+			}
+
+			return result;
+
+		}
+
+		static void ApplyLayoutToViewHierarchy(UIView view)
+		{
+			if (!view.GetIncludeYogaLayout())
+				return;
+
+			var node = GetYogaNode(view);
+			CGPoint topLeft = new CGPoint(node.LayoutX, node.LayoutY);
+			CGPoint bottomRight = new CGPoint(topLeft.X + node.LayoutWidth, topLeft.Y + node.LayoutHeight);
+			view.Frame = new CGRect(RoundPixelValue(topLeft.X), RoundPixelValue(topLeft.Y), RoundPixelValue(bottomRight.X) - RoundPixelValue(topLeft.X), RoundPixelValue(bottomRight.Y) - RoundPixelValue(topLeft.Y));
+			bool isLeaf = !view.GetUsesYoga() || view.Subviews.Length == 0;
+			if (!isLeaf)
+			{
+				for (int i = 0; i < view.Subviews.Length; i++)
+				{
+					ApplyLayoutToViewHierarchy(view.Subviews[i]);
+				}
+			}
+		}
+
+		static double RoundPixelValue(nfloat value)
+		{
+			nfloat scale = UIScreen.MainScreen.Scale;
+
+			return Math.Round(value * scale) / scale;
+		}
+
+		static void AttachNodesFromViewHierachy(UIView view)
+		{
+			var node = GetYogaNode(view);
+
+			// Only leaf nodes should have a measure function
+			if (!view.GetUsesYoga() || view.Subviews.Length == 0)
+			{
+				node.SetMeasureFunction(MeasureView);
+				RemoveAllChildren(node);
+			}
+			else
+			{
+				node.SetMeasureFunction(null);
+				// Create a list of all the subviews that we are going to use for layout.
+				var subviewsToInclude = new List<UIView>();
+				foreach (var subview in view.Subviews)
+				{
+					if (subview.GetIncludeYogaLayout())
+					{
+						subviewsToInclude.Add(subview);
+					}
+				}
+
+				var shouldReconstructChildList = false;
+				if (node.Count != subviewsToInclude.Count)
+				{
+					shouldReconstructChildList = true;
+				}
+				else
+				{
+					for (int i = 0; i < subviewsToInclude.Count; i++)
+					{
+						if (node[i] != GetYogaNode(subviewsToInclude[i]))
+						{
+							shouldReconstructChildList = true;
+							break;
+						}
+					}
+				}
+
+				if (shouldReconstructChildList)
+				{
+					RemoveAllChildren(node);
+
+					for (int i = 0; i < subviewsToInclude.Count; i++)
+					{
+						var subView = subviewsToInclude[i];
+						node.Insert(i, subView.GetYogaNode());
+						AttachNodesFromViewHierachy(subView);
+					}
+				}
+			}
+		}
+
+		static void RemoveAllChildren(YogaNode node)
+		{
+			if (node == null)
+				return;
+
+			while (node.Count > 0)
+			{
+				node.Clear();
+			}
+		}
+
+		static YogaNode GetYogaNode(this UIView view)
+		{
+			var value = ObjCRuntime.Runtime.GetNSObject(objc_getAssociatedObject(view.Handle, YogaNodeKey.Handle)) as YGNodeBridge;
+			if (value == null)
+			{
+				value = new YGNodeBridge();
+				value.SetContext(view);
+				objc_setAssociatedObject(view.Handle, YogaNodeKey.Handle, value.Handle, AssociationPolicy.RETAIN_NONATOMIC);
+			}
+			return value.node;
+		}
+
+		[DllImport("/usr/lib/libobjc.dylib")]
+		static extern void objc_setAssociatedObject(IntPtr @object, IntPtr key, IntPtr value, AssociationPolicy policy);
+
+		[DllImport("/usr/lib/libobjc.dylib")]
+		static extern IntPtr objc_getAssociatedObject(IntPtr @object, IntPtr key);
+
+		enum AssociationPolicy
+		{
+			ASSIGN = 0,
+			RETAIN_NONATOMIC = 1,
+			COPY_NONATOMIC = 3,
+			RETAIN = 01401,
+			COPY = 01403,
+		}
+	}
+}