From 17fdde66d94155fc62a034fa6658995bef6fd6e5 Mon Sep 17 00:00:00 2001
From: Jason Smith <jason.smith@xamarin.com>
Date: Tue, 22 Mar 2016 13:02:25 -0700
Subject: Initial import

---
 .../Extensions/UIViewExtensions.cs                 | 66 ++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 Xamarin.Forms.Platform.iOS/Extensions/UIViewExtensions.cs

(limited to 'Xamarin.Forms.Platform.iOS/Extensions/UIViewExtensions.cs')

diff --git a/Xamarin.Forms.Platform.iOS/Extensions/UIViewExtensions.cs b/Xamarin.Forms.Platform.iOS/Extensions/UIViewExtensions.cs
new file mode 100644
index 00000000..9847867c
--- /dev/null
+++ b/Xamarin.Forms.Platform.iOS/Extensions/UIViewExtensions.cs
@@ -0,0 +1,66 @@
+using System.Collections.Generic;
+using System.Drawing;
+using System.Linq;
+using System;
+#if __UNIFIED__
+using UIKit;
+
+#else
+using MonoTouch.UIKit;
+#endif
+
+namespace Xamarin.Forms.Platform.iOS
+{
+	public static class UIViewExtensions
+	{
+		public static IEnumerable<UIView> Descendants(this UIView self)
+		{
+			if (self.Subviews == null)
+				return Enumerable.Empty<UIView>();
+			return self.Subviews.Concat(self.Subviews.SelectMany(s => s.Descendants()));
+		}
+
+		public static SizeRequest GetSizeRequest(this UIView self, double widthConstraint, double heightConstraint, double minimumWidth = -1, double minimumHeight = -1)
+		{
+			var s = self.SizeThatFits(new SizeF((float)widthConstraint, (float)heightConstraint));
+			var request = new Size(s.Width == float.PositiveInfinity ? double.PositiveInfinity : s.Width, s.Height == float.PositiveInfinity ? double.PositiveInfinity : s.Height);
+			var minimum = new Size(minimumWidth < 0 ? request.Width : minimumWidth, minimumHeight < 0 ? request.Height : minimumHeight);
+			return new SizeRequest(request, minimum);
+		}
+
+		internal static T FindDescendantView<T>(this UIView view) where T : UIView
+		{
+			var queue = new Queue<UIView>();
+			queue.Enqueue(view);
+
+			while (queue.Count > 0)
+			{
+				var descendantView = queue.Dequeue();
+
+				var result = descendantView as T;
+				if (result != null)
+					return result;
+
+				for (var i = 0; i < descendantView.Subviews.Length; i++)
+					queue.Enqueue(descendantView.Subviews[i]);
+			}
+
+			return null;
+		}
+
+		internal static UIView FindFirstResponder(this UIView view)
+		{
+			if (view.IsFirstResponder)
+				return view;
+
+			foreach (var subView in view.Subviews)
+			{
+				var firstResponder = subView.FindFirstResponder();
+				if (firstResponder != null)
+					return firstResponder;
+			}
+
+			return null;
+		}
+	}
+}
\ No newline at end of file
-- 
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