1 files changed, 101 insertions, 0 deletions
diff --git a/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla30651.cs b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla30651.cs
new file mode 100644
index 00000000..a2466b98
--- /dev/null
+++ b/Xamarin.Forms.Controls.Issues/Xamarin.Forms.Controls.Issues.Shared/Bugzilla30651.cs
@@ -0,0 +1,101 @@
+using System;
+using Xamarin.Forms.CustomAttributes;
+using System.Collections.ObjectModel;
+using System.Linq;
+
+namespace Xamarin.Forms.Controls
+{
+	[Preserve (AllMembers = true)]
+	[Issue (IssueTracker.Bugzilla, 30651, "ListView jumps around while scrolling after items are added to its source")]
+	public class Bugzilla30651: TestContentPage
+	{
+		ListViewModel _viewModel;
+		protected override void Init ()
+		{
+			_viewModel = new ListViewModel();
+			BindingContext = _viewModel;
+			var lv = new ListView ();
+			lv.SetBinding (ListView.ItemsSourceProperty, new Binding ("Items"));
+			lv.SeparatorVisibility = SeparatorVisibility.None;
+			lv.HasUnevenRows = true;
+			lv.ItemAppearing+= (object sender, ItemVisibilityEventArgs e) => {
+				_viewModel.OnItemAppearing(e.Item.ToString());
+			};
+			lv.ItemTemplate = new DataTemplate (typeof(TestCell));
+			Content = lv;
+		}
+
+		public class TestCell : ViewCell {
+			Label _myLabel;
+			public TestCell ()
+			{
+				View = _myLabel = new Label();
+			}
+
+			protected override void OnBindingContextChanged()
+			{
+				if (BindingContext == null)
+					return;
+
+				var i = BindingContext as string;
+				_myLabel.Text = i;
+				Height = 100;
+
+				base.OnBindingContextChanged();
+			}
+		}
+
+
+		public class ListViewModel : ViewModelBase
+		{
+			ObservableCollection<string> _items;
+			int _counter = 0;
+
+			public ObservableCollection<string> Items
+			{
+				get { return _items; }
+				set { _items = value; OnPropertyChanged ();}
+			}
+
+			public ListViewModel()
+			{
+				Items = new ObservableCollection<string>();
+				AddMoreData();
+			}
+
+			public void OnItemAppearing(string s)
+			{
+				if (Items.Last() == s)
+					AddMoreData();
+			}
+
+			void AddMoreData()
+			{
+				_counter++;
+				Items.Add(_counter.ToString());
+				_counter++;
+				Items.Add(_counter.ToString());
+				_counter++;
+				Items.Add(_counter.ToString());
+				_counter++;
+				Items.Add(_counter.ToString());
+				_counter++;
+				Items.Add(_counter.ToString());
+				_counter++;
+				Items.Add(_counter.ToString());
+				_counter++;
+				Items.Add(_counter.ToString());
+				_counter++;
+				Items.Add(_counter.ToString());
+				_counter++;
+				Items.Add(_counter.ToString());
+				_counter++;
+				Items.Add(_counter.ToString());
+				_counter++;
+				Items.Add(_counter.ToString());
+				_counter++;
+				Items.Add(_counter.ToString());
+			}
+		}
+	}
+}