progress on XF picker.

Ooui.Forms/Exports.cs

@@ -16,6 +16,7 @@ using Xamarin.Forms;
 [assembly: ExportRenderer (typeof (Label), typeof (LabelRenderer))]
 [assembly: ExportRenderer (typeof (LinkLabel), typeof (LinkLabelRenderer))]
 [assembly: ExportRenderer (typeof (LinkView), typeof (LinkViewRenderer))]
+[assembly: ExportRenderer(typeof(Picker), typeof(PickerRenderer))]
 [assembly: ExportRenderer(typeof(ListView), typeof(ListViewRenderer))]
 [assembly: ExportRenderer (typeof (ProgressBar), typeof (ProgressBarRenderer))]
 [assembly: ExportRenderer (typeof (SearchBar), typeof (SearchBarRenderer))]

Ooui.Forms/PickerRenderer.cs

@@ -0,0 +1,87 @@
+using Ooui.Forms.Extensions;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Linq;
+using Xamarin.Forms;
+using Xamarin.Forms.Internals;
+
+namespace Ooui.Forms.Renderers
+{
+    public class PickerRenderer : ViewRenderer<Picker, Select>
+    {
+        private bool _disposed;
+        private Select _select;
+
+        public PickerRenderer()
+        {
+        }
+
+        protected override void OnElementChanged(ElementChangedEventArgs<Picker> e)
+        {
+            if (e.NewElement != null)
+            {
+                if (Control == null)
+                {
+                    _select = new Select();
+                    _select.Change += _select_Change;
+
+                    SetNativeControl(_select);
+                }
+
+                UpdateItems();
+                UpdateBackgroundColor();
+            }
+
+            base.OnElementChanged(e);
+        }
+
+        private void _select_Change(object sender, TargetEventArgs e)
+        {
+            Element.SetValueFromRenderer(Picker.SelectedIndexProperty, Element.ItemsSource.IndexOf(_select.Value));
+        }
+
+        protected override void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
+        {
+            base.OnElementPropertyChanged(sender, e);
+
+            if (e.PropertyName == Picker.ItemsSourceProperty.PropertyName)
+            {
+                UpdateItems();
+            }
+
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            base.Dispose(disposing);
+
+            if (disposing && !_disposed)
+            {
+                _disposed = true;
+            }
+        }
+
+        private void UpdateBackgroundColor()
+        {
+            var backgroundColor = Element.BackgroundColor.ToOouiColor();
+
+            _select.Style.BackgroundColor = backgroundColor;
+        }
+
+        private void UpdateItems()
+        {
+            var items = Element.ItemsSource;
+
+            if (items != null)
+            {
+                foreach (var item in items)
+                {
+                    var s = item.ToString();
+                    _select.AddOption(s, s);
+                }
+            }
+        }
+
+    }
+
+}