1 files changed, 116 insertions, 0 deletions
diff --git a/Xamarin.Forms.Controls/GalleryPages/LayoutPerformanceGallery.cs b/Xamarin.Forms.Controls/GalleryPages/LayoutPerformanceGallery.cs
new file mode 100644
index 00000000..9778e372
--- /dev/null
+++ b/Xamarin.Forms.Controls/GalleryPages/LayoutPerformanceGallery.cs
@@ -0,0 +1,116 @@
+using System;
+using System.Collections.Generic;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Xamarin.Forms.Controls.GalleryPages
+{
+	public class LayoutPerformanceGallery : ContentPage
+	{
+		public LayoutPerformanceGallery ()
+		{
+			int size = 3;
+
+			var grid = new Grid {
+				VerticalOptions = LayoutOptions.FillAndExpand,
+				RowDefinitions = {
+					new RowDefinition { Height = new GridLength (100, GridUnitType.Absolute) },
+					new RowDefinition { Height = new GridLength (5, GridUnitType.Star) },
+					new RowDefinition { Height = new GridLength (7, GridUnitType.Star) },
+				},
+				ColumnDefinitions = {
+					new ColumnDefinition { Width = new GridLength (3, GridUnitType.Star) },
+					new ColumnDefinition { Width = new GridLength (100, GridUnitType.Absolute) },
+					new ColumnDefinition { Width = new GridLength (7, GridUnitType.Star) },
+				}
+			};
+
+			for (int i = 0; i < size; i++) {
+				for (int j = 0; j < size; j++) {
+					var g = new Grid {
+						RowDefinitions = {
+							new RowDefinition { Height = new GridLength (100, GridUnitType.Absolute) },
+							new RowDefinition { Height = new GridLength (5, GridUnitType.Star) },
+							new RowDefinition { Height = new GridLength (7, GridUnitType.Star) },
+						},
+						ColumnDefinitions = {
+							new ColumnDefinition { Width = new GridLength (3, GridUnitType.Star) },
+							new ColumnDefinition { Width = new GridLength (100, GridUnitType.Absolute) },
+							new ColumnDefinition { Width = new GridLength (7, GridUnitType.Star) },
+						}
+					};
+
+					for (int k = 0; k < size; k++) {
+						for (int l = 0; l < size; l++) {
+							var label = new Label { Text = "10" };
+							g.Children.Add (label, k, l);
+							_labelList.Add (label);
+						}
+					}
+
+					grid.Children.Add (g, i, j);
+				}
+			}
+
+
+
+
+			Content = new StackLayout {
+				Children = {
+					(_mainLabel = new Label ()),
+					grid
+				}
+			};
+		}
+
+		Label _mainLabel = null;
+		List<Label> _labelList = new List<Label> ();
+		Stopwatch _sw = new Stopwatch ();
+		long _ticks = 0;
+		int _count = 0;
+		int _cycle = 0;
+		bool _flip = true;
+		Random _r = new Random (34269027);
+		bool _repeat = false;
+
+		protected override void OnAppearing ()
+		{
+			base.OnAppearing ();
+			_repeat = true;
+			Device.StartTimer (TimeSpan.FromMilliseconds (10), () => {
+				_sw.Start ();
+				foreach (var label in _labelList) {
+					if (_flip) {
+						label.Text = _r.Next (10, 40).ToString ();
+					} else {
+						label.Text = _r.Next (50, 90).ToString ();
+					}
+				}
+				_sw.Stop ();
+				_ticks += _sw.ElapsedMilliseconds;
+				_sw.Reset ();
+
+				_cycle = (_cycle + 1) % 100;
+				_count++;
+				if (_cycle == 0) {
+					_mainLabel.Text = string.Format ("Avg Time: {0:0.000}ms", _ticks / (double)_count);
+				}
+
+				_flip = !_flip;
+				return _repeat;
+			});
+		}
+
+		protected override void OnDisappearing ()
+		{
+			_repeat = false;
+			_ticks = 0;
+			_count = 0;
+			_cycle = 0;
+
+			base.OnDisappearing ();
+		}
+	}
+}