From: chungryeol lim <cdark.lim@samsung.com>
Date: Mon, 26 Dec 2016 09:50:44 +0000 (+0900)
Subject: implement ExpressionSearch for RelativeLayout.FromExpression
X-Git-Tag: accepted/tizen/4.0/unified/20170816.011313~208
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=46a592e93f0ed0f6d17f2ddeb35c96f994692159;p=platform%2Fupstream%2Fxamarin-forms.git

implement ExpressionSearch for RelativeLayout.FromExpression

Change-Id: Id2fdeea22736d08844d8552015dbb895ae2fa28a
Signed-off-by: chungryeol lim <cdark.lim@samsung.com>
---

diff --git a/Xamarin.Forms.Platform.Tizen/Forms.cs b/Xamarin.Forms.Platform.Tizen/Forms.cs
index 6aa0e62..f5989e0 100644
--- a/Xamarin.Forms.Platform.Tizen/Forms.cs
+++ b/Xamarin.Forms.Platform.Tizen/Forms.cs
@@ -1,7 +1,10 @@
 using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Linq.Expressions;
 using System.Reflection;
-using Tizen.Applications;
 using ElmSharp;
+using Tizen.Applications;
 
 namespace Xamarin.Forms.Platform.Tizen
 {
@@ -155,7 +158,7 @@ namespace Xamarin.Forms.Platform.Tizen
 
 			// FIXME: We should consider TV and Common (Desktop) profiles also.
 			Device.Idiom = TargetIdiom.Phone;
-
+			ExpressionSearch.Default = new TizenExpressionSearch();
 			IsInitialized = true;
 		}
 
@@ -170,4 +173,31 @@ namespace Xamarin.Forms.Platform.Tizen
 			return Color.Black;
 		}
 	}
-}
+
+	class TizenExpressionSearch : ExpressionVisitor, IExpressionSearch
+	{
+		List<object> _results;
+		Type _targetType;
+
+		public List<T> FindObjects<T>(Expression expression) where T : class
+		{
+			_results = new List<object>();
+			_targetType = typeof(T);
+			Visit(expression);
+			return _results.Select(o => o as T).ToList();
+		}
+
+		protected override Expression VisitMember(MemberExpression node)
+		{
+			if (node.Expression is ConstantExpression && node.Member is FieldInfo)
+			{
+				var container = ((ConstantExpression)node.Expression).Value;
+				var value = ((FieldInfo)node.Member).GetValue(container);
+
+				if (_targetType.IsInstanceOfType(value))
+					_results.Add(value);
+			}
+			return base.VisitMember(node);
+		}
+	}
+}
\ No newline at end of file