Add TextColor Property to Picker, TimePicker, DatePicker (#84)

* Add TextColor property to TimePicker
Add TextColor page to TimePicker gallery
Add TimePicker color toggling to color toggle test page
Split color toggle tests up among tabs

* Implement TimePicker.TextColor in iOS

* Implement TimePicker.TextColor for WinRT tablet

* Add IsEnabled=false tests to DefaultColorToggleTest Button and TimePicker
Consolidate ColorStates array
Fix IsEnabled changing color bug on iOS

* Implement TimePicker.TextColor for WP8

* Add TextColor property to DatePicker
Add DatePicker section to DefaultColorToggleTest
Impement DatePicker.TextColor for WP8

* Implement DatePicker.TextColor for WinRT/UWP/Windows Phone 8.1

* Implement DatePicker.TextColor for iOS

* Add TextColor to DatePicker Gallery Page

* Implement DatePicker.TextColor for Android

* Add Picker Gallery page for TextColor
Implement Picker.TextColor on Android
Consolidate TextColor management for Button, Picker, DatePicker, TimePicker
Implement

* Add untracked TextColorSwitcher
Implement Picker.TextColor in iOS

* Implement Picker.TextColor in WinRT/UWP/Windows Phone 8.1
Remove Pioker Loaded handlers in Dispose

* Implement Picker.TextColor in WP8

* Removed unused field
Update ignored warnings

* Update docs

* Use nameof() for BindableProperties

* Cleanup

* Fix custom renderer crashes for classes using TextColorSwitcher

* Correct property name references

* Fix typo and 'if' formatting

* Add missing else

1 files changed, 12 insertions, 1 deletions

diff --git a/Xamarin.Forms.Platform.Android/Renderers/PickerRenderer.cs b/Xamarin.Forms.Platform.Android/Renderers/PickerRenderer.cs
index b9114d22..e9cc3942 100644
--- a/Xamarin.Forms.Platform.Android/Renderers/PickerRenderer.cs
+++ b/Xamarin.Forms.Platform.Android/Renderers/PickerRenderer.cs
@@ -2,19 +2,21 @@ using System;
 using System.ComponentModel;
 using System.Linq;
 using Android.App;
+using Android.Content.Res;
 using Android.Views;
 using Android.Widget;
 using ADatePicker = Android.Widget.DatePicker;
 using ATimePicker = Android.Widget.TimePicker;
 using Object = Java.Lang.Object;
+using Orientation = Android.Widget.Orientation;
 
 namespace Xamarin.Forms.Platform.Android
 {
 	public class PickerRenderer : ViewRenderer<Picker, EditText>
 	{
 		AlertDialog _dialog;
-
 		bool _isDisposed;
+		TextColorSwitcher _textColorSwitcher;
 
 		public PickerRenderer()
 		{
@@ -44,9 +46,11 @@ namespace Xamarin.Forms.Platform.Android
 				{
 					var textField = new EditText(Context) { Focusable = false, Clickable = true, Tag = this };
 					textField.SetOnClickListener(PickerListener.Instance);
+					_textColorSwitcher = new TextColorSwitcher(textField.TextColors);
 					SetNativeControl(textField);
 				}
 				UpdatePicker();
+				UpdateTextColor();
 			}
 
 			base.OnElementChanged(e);
@@ -60,6 +64,8 @@ namespace Xamarin.Forms.Platform.Android
 				UpdatePicker();
 			if (e.PropertyName == Picker.SelectedIndexProperty.PropertyName)
 				UpdatePicker();
+			if (e.PropertyName == Picker.TextColorProperty.PropertyName)
+				UpdateTextColor();
 		}
 
 		internal override void OnFocusChangeRequested(object sender, VisualElement.FocusRequestArgs e)
@@ -148,6 +154,11 @@ namespace Xamarin.Forms.Platform.Android
 				((IVisualElementController)Element).NativeSizeChanged();
 		}
 
+		void UpdateTextColor()
+		{
+			_textColorSwitcher?.UpdateTextColor(Control, Element.TextColor);
+		}
+
 		class PickerListener : Object, IOnClickListener
 		{
 			public static readonly PickerListener Instance = new PickerListener();