1 files changed, 117 insertions, 0 deletions
diff --git a/Xamarin.Forms.Controls/GalleryPages/ListPage.cs b/Xamarin.Forms.Controls/GalleryPages/ListPage.cs
new file mode 100644
index 00000000..0eeaf147
--- /dev/null
+++ b/Xamarin.Forms.Controls/GalleryPages/ListPage.cs
@@ -0,0 +1,117 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Xamarin.Forms.Controls
+{
+	public class ListPage : ContentPage
+	{
+		ListScreen _listScreen;
+		public ListPage ()
+		{
+			_listScreen = new ListScreen ();
+			Content = new StackLayout {
+				Children = {
+					new Label {Text = "Foo"},
+					_listScreen.View
+				}
+			};
+		}
+	}
+
+	public class ListScreen
+	{
+		public ListView View { get; private set; }
+
+		internal class A : INotifyPropertyChanged
+		{
+			string _text;
+			public string Text {
+				get {
+					return _text;
+				}
+				set {
+					_text = value;
+					if(PropertyChanged != null)
+						PropertyChanged(this, new PropertyChangedEventArgs("Text"));
+				}
+			}
+
+			#region INotifyPropertyChanged implementation
+
+			public event PropertyChangedEventHandler PropertyChanged;
+
+			#endregion
+		}
+
+		[Preserve (AllMembers = true)]
+		internal class ViewCellTest : ViewCell
+		{
+			static int s_inc = 0;
+
+			public ViewCellTest ()
+			{
+				var stackLayout = new StackLayout {
+					Orientation = StackOrientation.Horizontal
+				};
+
+				var label = new Label ();
+				label.SetBinding (Label.TextProperty, "Text");
+
+				var box = new BoxView {WidthRequest = 100, HeightRequest = 10, Color = Color.Red};
+
+				stackLayout.Children.Add (label);
+				stackLayout.Children.Add (box);
+
+				View = stackLayout;
+			}
+
+			protected override void OnAppearing ()
+			{
+				base.OnAppearing ();
+				Debug.WriteLine ("Appearing: " + (BindingContext as A)?.Text + " : " + s_inc);
+				s_inc++;
+			}
+
+			protected override void OnDisappearing ()
+			{
+				base.OnDisappearing ();
+				Debug.WriteLine ("Disappearing: " + (BindingContext as A)?.Text + " : " + s_inc);
+				s_inc++;
+			}
+		}
+
+		public ListScreen ()
+		{
+
+			View = new ListView (ListViewCachingStrategy.RecycleElement);
+
+			View.RowHeight = 30;
+
+			var n = 500;
+			var items = Enumerable.Range (0, n).Select (i => new A {Text = i.ToString ()}).ToList ();
+			View.ItemsSource = items;
+
+			View.ItemTemplate = new DataTemplate (typeof (ViewCellTest));
+
+			View.ItemSelected += (sender, e) => {
+				var cell = (e.SelectedItem as A);
+				if (cell == null)
+					return;
+				var x = int.Parse (cell.Text);
+				if (x == 5) {
+					n += 10;
+					View.ItemsSource = Enumerable.Range (0, n).Select (i => new A { Text = i.ToString () }).ToList ();
+				} else {
+					cell.Text = (x + 1).ToString ();
+				}
+			};
+
+				
+		}
+	}
+}