1 files changed, 34 insertions, 0 deletions
diff --git a/Xamarin.Forms.Core/BoundsConstraint.cs b/Xamarin.Forms.Core/BoundsConstraint.cs
new file mode 100644
index 00000000..43be86eb
--- /dev/null
+++ b/Xamarin.Forms.Core/BoundsConstraint.cs
@@ -0,0 +1,34 @@
+using System;
+using System.Collections.Generic;
+using System.Linq.Expressions;
+
+namespace Xamarin.Forms
+{
+	public class BoundsConstraint
+	{
+		Func<Rectangle> _measureFunc;
+
+		BoundsConstraint()
+		{
+		}
+
+		internal IEnumerable<View> RelativeTo { get; set; }
+
+		public static BoundsConstraint FromExpression(Expression<Func<Rectangle>> expression, IEnumerable<View> parents = null)
+		{
+			Func<Rectangle> compiled = expression.Compile();
+			var result = new BoundsConstraint
+			{
+				_measureFunc = compiled,
+				RelativeTo = parents ?? ExpressionSearch.Default.FindObjects<View>(expression).ToArray() // make sure we have our own copy
+			};
+
+			return result;
+		}
+
+		internal Rectangle Compute()
+		{
+			return _measureFunc();
+		}
+	}
+}
+\ No newline at end of file