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Rui Marinho
255
csharp/Facebook.YogaKit/YogaKitNative.cs
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255
csharp/Facebook.YogaKit/YogaKitNative.cs
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using System;
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using System.Collections.Generic;
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using System.Runtime.InteropServices;
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using Facebook.Yoga;
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#if __IOS__
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using CoreGraphics;
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using Foundation;
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using UIKit;
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#endif
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namespace Facebook.YogaKit
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{
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internal static class YogaKitNative
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{
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static NSString YogaNodeKey = new NSString("YogaNode");
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static NSString UsesYogaKey = new NSString("UsesYoga");
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static NSString IncludeYogaKey = new NSString("UsesYoga");
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public static void UsesYoga(UIView view, bool usesYoga)
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{
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var value = NSNumber.FromBoolean(usesYoga);
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objc_setAssociatedObject(view.Handle, UsesYogaKey.Handle, value.Handle, AssociationPolicy.RETAIN_NONATOMIC);
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}
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public static bool GetUsesYoga(UIView view)
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{
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var value = ObjCRuntime.Runtime.GetNSObject(objc_getAssociatedObject(view.Handle, UsesYogaKey.Handle)) as NSNumber;
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return value == null ? false : value.BoolValue;
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}
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public static void IncludeYogaLayout(UIView view, bool includeInLayout)
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{
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var value = NSNumber.FromBoolean(includeInLayout);
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objc_setAssociatedObject(view.Handle, IncludeYogaKey.Handle, value.Handle, AssociationPolicy.RETAIN_NONATOMIC);
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}
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public static bool GetIncludeYogaLayout(UIView view)
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{
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var value = ObjCRuntime.Runtime.GetNSObject(objc_getAssociatedObject(view.Handle, IncludeYogaKey.Handle)) as NSNumber;
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return value == null ? true : value.BoolValue;
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}
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public static YogaNode GetYogaNode(UIView view)
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{
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var value = ObjCRuntime.Runtime.GetNSObject(objc_getAssociatedObject(view.Handle, YogaNodeKey.Handle)) as YGNodeBridge;
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if (value == null)
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{
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value = new YGNodeBridge();
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value.SetContext(view);
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objc_setAssociatedObject(view.Handle, YogaNodeKey.Handle, value.Handle, AssociationPolicy.RETAIN_NONATOMIC);
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}
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return value.node;
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}
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public static CGSize CalculateLayoutWithSize(UIView view, CGSize size)
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{
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if (!view.GetUsesYoga())
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{
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System.Diagnostics.Debug.WriteLine("Doesn't use Yoga");
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}
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AttachNodesFromViewHierachy(view);
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var node = GetYogaNode(view);
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node.Width = (float)size.Width;
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node.Height = (float)size.Height;
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node.CalculateLayout();
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return new CGSize { Width = node.LayoutWidth, Height = node.LayoutHeight };
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}
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public static void ApplyLayoutToViewHierarchy(UIView view)
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{
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if (!view.GetIncludeYogaLayout())
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return;
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var node = GetYogaNode(view);
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CGPoint topLeft = new CGPoint(node.LayoutX, node.LayoutY);
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CGPoint bottomRight = new CGPoint(topLeft.X + node.LayoutWidth, topLeft.Y + node.LayoutHeight);
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view.Frame = new CGRect(RoundPixelValue(topLeft.X), RoundPixelValue(topLeft.Y), RoundPixelValue(bottomRight.X) - RoundPixelValue(topLeft.X), RoundPixelValue(bottomRight.Y) - RoundPixelValue(topLeft.Y));
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bool isLeaf = !view.GetUsesYoga() || view.Subviews.Length == 0;
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if (!isLeaf)
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{
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for (int i = 0; i < view.Subviews.Length; i++)
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{
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ApplyLayoutToViewHierarchy(view.Subviews[i]);
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}
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}
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}
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public static CGSize YogaIntrinsicSize(this UIView view)
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{
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var constrainedSize = new CGSize
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{
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Width = float.NaN,
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Height = float.NaN
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};
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return CalculateLayoutWithSize(view, constrainedSize);
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}
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static YogaSize MeasureView(YogaNode node, float width, YogaMeasureMode widthMode, float height, YogaMeasureMode heightMode)
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{
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var constrainedWidth = (widthMode == YogaMeasureMode.Undefined) ? nfloat.MaxValue : width;
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var constrainedHeight = (heightMode == YogaMeasureMode.Undefined) ? nfloat.MaxValue : height;
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UIView view = null;
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if (YogaKit.Bridges.ContainsKey(node))
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(YogaKit.Bridges[node] as YGNodeBridge).viewRef.TryGetTarget(out view);
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var sizeThatFits = view.SizeThatFits(new CGSize(constrainedWidth, constrainedHeight));
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var finalWidth = SanitizeMeasurement(constrainedWidth, sizeThatFits.Width, widthMode);
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var finalHeight = SanitizeMeasurement(constrainedHeight, sizeThatFits.Height, heightMode);
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return MeasureOutput.Make(finalWidth, finalHeight);
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}
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static float SanitizeMeasurement(nfloat constrainedSize, nfloat measuredSize, YogaMeasureMode measureMode)
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{
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float result;
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if (measureMode == YogaMeasureMode.Exactly)
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{
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result = (float)constrainedSize;
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}
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else if (measureMode == YogaMeasureMode.AtMost)
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{
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result = (float)Math.Min(constrainedSize, measuredSize);
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}
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else {
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result = (float)measuredSize;
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}
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return result;
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}
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static double RoundPixelValue(nfloat value)
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{
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nfloat scale = UIScreen.MainScreen.Scale;
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return Math.Round(value * scale) / scale;
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}
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static void AttachNodesFromViewHierachy(UIView view)
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{
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var node = GetYogaNode(view);
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// Only leaf nodes should have a measure function
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if (!view.GetUsesYoga() || view.Subviews.Length == 0)
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{
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node.SetMeasureFunction(MeasureView);
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RemoveAllChildren(node);
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}
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else
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{
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node.SetMeasureFunction(null);
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// Create a list of all the subviews that we are going to use for layout.
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var subviewsToInclude = new List<UIView>();
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foreach (var subview in view.Subviews)
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{
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if (subview.GetIncludeYogaLayout())
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{
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subviewsToInclude.Add(subview);
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}
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}
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var shouldReconstructChildList = false;
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if (node.Count != subviewsToInclude.Count)
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{
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shouldReconstructChildList = true;
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}
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else
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{
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for (int i = 0; i < subviewsToInclude.Count; i++)
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{
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if (node[i] != GetYogaNode(subviewsToInclude[i]))
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{
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shouldReconstructChildList = true;
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break;
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}
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}
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}
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if (shouldReconstructChildList)
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{
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RemoveAllChildren(node);
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for (int i = 0; i < subviewsToInclude.Count; i++)
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{
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var subView = subviewsToInclude[i];
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node.Insert(i, subView.GetYogaNode());
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AttachNodesFromViewHierachy(subView);
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}
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}
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}
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}
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static void RemoveAllChildren(YogaNode node)
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{
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if (node == null)
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return;
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while (node.Count > 0)
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{
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node.Clear();
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}
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}
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[DllImport("/usr/lib/libobjc.dylib")]
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static extern void objc_setAssociatedObject(IntPtr @object, IntPtr key, IntPtr value, AssociationPolicy policy);
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[DllImport("/usr/lib/libobjc.dylib")]
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static extern IntPtr objc_getAssociatedObject(IntPtr @object, IntPtr key);
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enum AssociationPolicy
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{
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ASSIGN = 0,
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RETAIN_NONATOMIC = 1,
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COPY_NONATOMIC = 3,
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RETAIN = 01401,
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COPY = 01403,
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}
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}
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class YGNodeBridge : NSObject
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{
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bool disposed;
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internal WeakReference<UIView> viewRef;
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internal YogaNode node;
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public YGNodeBridge()
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{
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node = new YogaNode();
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}
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public void SetContext(UIView view)
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{
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viewRef = new WeakReference<UIView>(view);
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YogaKit.Bridges.Add(node, this);
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}
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protected override void Dispose(bool disposing)
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{
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if (disposing && !disposed)
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{
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disposed = true;
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YogaKit.Bridges.Remove(node);
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viewRef = null;
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node = null;
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}
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base.Dispose(disposing);
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}
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}
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}
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