Merge pull request #94 from ericsink/master

WIP: Xamarin.Forms 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/Renderers/PickerRenderer.cs

@@ -0,0 +1,88 @@
+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)
+            {
+				_select.Change -= _select_Change;
+                _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);
+                }
+            }
+        }
+
+    }
+
+}

Samples/PickerSample.cs

@@ -0,0 +1,75 @@
+using Ooui;
+using System;
+using System.Collections.Generic;
+using Xamarin.Forms;
+
+namespace Samples
+{
+    public class PickerSample : ISample
+    {
+        private Xamarin.Forms.Label _label;
+        private Xamarin.Forms.Picker _picker;
+
+        public string Title => "Xamarin.Forms Picker Sample";
+
+		List<string> myItems = new List<string>
+		{
+			"red",
+			"green",
+			"yellow",
+			"blue",
+			"white",
+			"black",
+			"purple",
+			"orange",
+		};
+
+        public Ooui.Element CreateElement()
+        {
+            var panel = new StackLayout();
+
+            var titleLabel = new Xamarin.Forms.Label
+            {
+                Text = "Picker",
+                FontSize = 24,
+                FontAttributes = FontAttributes.Bold
+            };
+            panel.Children.Add(titleLabel);
+
+            _picker = new Picker
+			{
+				Title = "Hello",
+				//VerticalOptions = LayoutOptions.CenterAndExpand,
+				ItemsSource = myItems,
+			};
+
+            panel.Children.Add(_picker);
+
+            _picker.SelectedIndexChanged += OnPickerValueChanged;
+
+            _label = new Xamarin.Forms.Label
+            {
+                Text = "Picker value is",
+                HorizontalOptions = LayoutOptions.Center
+            };
+            panel.Children.Add(_label);
+
+            var page = new ContentPage
+            {
+                Content = panel
+            };
+
+            return page.GetOouiElement();
+        }
+
+        void OnPickerValueChanged(object sender, EventArgs e)
+        {
+            _label.Text = String.Format("Picker value is {0} ({1})", _picker.SelectedIndex, myItems[_picker.SelectedIndex]);
+        }
+
+        public void Publish()
+        {
+            UI.Publish("/picker", CreateElement);
+        }
+    }
+}

Samples/Program.cs

@@ -43,6 +43,7 @@ namespace Samples
             new WeatherAppSample().Publish();
             new XuzzleSample().Publish();
             new WebViewSample().Publish();
+            new PickerSample().Publish();
 
             UI.Present ("/display-alert");