1 files changed, 142 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.Tizen/Cells/CellRenderer.cs b/Xamarin.Forms.Platform.Tizen/Cells/CellRenderer.cs
new file mode 100644
index 00000000..1cda74c2
--- /dev/null
+++ b/Xamarin.Forms.Platform.Tizen/Cells/CellRenderer.cs
@@ -0,0 +1,142 @@
+using ElmSharp;
+using System.Collections.Generic;
+using EColor = ElmSharp.Color;
+
+namespace Xamarin.Forms.Platform.Tizen
+{
+	public abstract class CellRenderer : IRegisterable
+	{
+		const string _heightProperty = "Height";
+		protected static readonly EColor s_defaultTextColor = EColor.Black;
+		protected static readonly EColor s_defaultBackgroundColor = EColor.White;
+		readonly Dictionary<Cell, Dictionary<string, EvasObject>> _realizedNativeViews = new Dictionary<Cell, Dictionary<string, EvasObject>>();
+
+		protected CellRenderer(string style)
+		{
+			Class = new GenItemClass(style)
+			{
+				GetTextHandler = GetText,
+				GetContentHandler = GetContent,
+				DeleteHandler = ItemDeleted,
+			};
+		}
+
+		public GenItemClass Class
+		{
+			get;
+			private set;
+		}
+
+		protected virtual bool OnCellPropertyChanged(Cell cell, string property, Dictionary<string, EvasObject> realizedView)
+		{
+			if (property == _heightProperty)
+			{
+				return true;
+			}
+			return false;
+		}
+
+		protected virtual Span OnGetText(Cell cell, string part)
+		{
+			return null;
+		}
+		protected virtual EvasObject OnGetContent(Cell cell, string part)
+		{
+			return null;
+		}
+		protected virtual void OnDeleted(Cell cell)
+		{
+		}
+
+		protected virtual void OnUnrealizedCell(Cell cell)
+		{
+		}
+
+		protected int FindCellContentHeight(Cell cell)
+		{
+			ViewCell viewCell = cell as ViewCell;
+			if (viewCell != null)
+			{
+				var parentWidth = (cell.Parent as VisualElement).Width;
+				var view = viewCell.View;
+				return (int)view.Measure(parentWidth, double.PositiveInfinity).Request.Height;
+			}
+			else
+				return -1;
+		}
+
+		static Native.Span ToNative(Span span)
+		{
+			var nativeSpan = new Native.Span();
+			nativeSpan.Text = span.Text;
+			nativeSpan.ForegroundColor = span.ForegroundColor.IsDefault ? s_defaultTextColor : span.ForegroundColor.ToNative();
+			nativeSpan.FontAttributes = span.FontAttributes;
+			nativeSpan.BackgroundColor = span.BackgroundColor.IsDefault ? s_defaultBackgroundColor : span.BackgroundColor.ToNative();
+			nativeSpan.FontSize = span.FontSize;
+			nativeSpan.FontFamily = span.FontFamily;
+			return nativeSpan;
+		}
+
+		internal void SendCellPropertyChanged(Cell cell, GenListItem item, string property)
+		{
+			Dictionary<string, EvasObject> realizedView = null;
+			_realizedNativeViews.TryGetValue(cell, out realizedView);
+
+			// just to prevent null reference exception in OnCellPropertyChanged
+			realizedView = realizedView ?? new Dictionary<string, EvasObject>();
+
+			if (property == Cell.IsEnabledProperty.PropertyName)
+			{
+				item.IsEnabled = cell.IsEnabled;
+			}
+			// if true was returned, item was updated
+			// if it's possible to update the cell property without Update(), return false
+			else if (OnCellPropertyChanged(cell, property, realizedView))
+			{
+				item.Update();
+			}
+		}
+
+		internal void SendUnrealizedCell(Cell cell)
+		{
+			_realizedNativeViews.Remove(cell);
+			OnUnrealizedCell(cell);
+		}
+
+		string GetText(object data, string part)
+		{
+			var span = OnGetText((data as Native.ListView.ItemContext).Cell, part);
+			return span != null ? ToNative(span).GetDecoratedText() : null;
+		}
+
+		EvasObject GetContent(object data, string part)
+		{
+			var cell = (data as Native.ListView.ItemContext).Cell;
+			EvasObject nativeView = OnGetContent(cell, part);
+			if (part != null && nativeView != null)
+			{
+				Dictionary<string, EvasObject> realizedView = null;
+				_realizedNativeViews.TryGetValue(cell, out realizedView);
+				if (realizedView == null)
+				{
+					realizedView = new Dictionary<string, EvasObject>();
+					_realizedNativeViews[cell] = realizedView;
+				}
+				realizedView[part] = nativeView;
+
+				nativeView.Deleted += (sender, e) =>
+				{
+					realizedView.Remove(part);
+				};
+			}
+			return nativeView;
+		}
+
+		void ItemDeleted(object data)
+		{
+			var cell = (data as Native.ListView.ItemContext).Cell;
+			_realizedNativeViews.Remove(cell);
+			OnDeleted(cell);
+		}
+	}
+}