From a490740a2e76b9c53735d9778d4c6e0fa9e4bf22 Mon Sep 17 00:00:00 2001
From: Samantha Houts <samantha@teamredwall.com>
Date: Mon, 18 Jul 2016 16:33:41 -0700
Subject: [Win] Setting TabbedPage.BarTextColor works (#244)

[Win] TabbedPage BarBG takes precedence
---
 Xamarin.Forms.Platform.WinRT.Phone/FormsPivot.cs   |   6 +-
 .../PhoneResources.xaml                            |   6 +-
 .../TabbedPageRenderer.cs                          | 103 +++++++++++++++------
 3 files changed, 77 insertions(+), 38 deletions(-)

(limited to 'Xamarin.Forms.Platform.WinRT.Phone')

diff --git a/Xamarin.Forms.Platform.WinRT.Phone/FormsPivot.cs b/Xamarin.Forms.Platform.WinRT.Phone/FormsPivot.cs
index d829b787..a2e765b3 100644
--- a/Xamarin.Forms.Platform.WinRT.Phone/FormsPivot.cs
+++ b/Xamarin.Forms.Platform.WinRT.Phone/FormsPivot.cs
@@ -12,12 +12,12 @@ namespace Xamarin.Forms.Platform.WinRT
 {
 	public class FormsPivot : Pivot, IToolbarProvider
 	{
-		public static readonly DependencyProperty ToolbarVisibilityProperty = DependencyProperty.Register("ToolbarVisibility", typeof(Visibility), typeof(FormsPivot),
+		public static readonly DependencyProperty ToolbarVisibilityProperty = DependencyProperty.Register(nameof(ToolbarVisibility), typeof(Visibility), typeof(FormsPivot),
 			new PropertyMetadata(Visibility.Collapsed));
 
-		public static readonly DependencyProperty ToolbarForegroundProperty = DependencyProperty.Register("ToolbarForeground", typeof(Brush), typeof(FormsPivot), new PropertyMetadata(default(Brush)));
+		public static readonly DependencyProperty ToolbarForegroundProperty = DependencyProperty.Register(nameof(ToolbarForeground), typeof(Brush), typeof(FormsPivot), new PropertyMetadata(default(Brush)));
 
-		public static readonly DependencyProperty ToolbarBackgroundProperty = DependencyProperty.Register("ToolbarBackground", typeof(Brush), typeof(FormsPivot), new PropertyMetadata(default(Brush)));
+		public static readonly DependencyProperty ToolbarBackgroundProperty = DependencyProperty.Register(nameof(ToolbarBackground), typeof(Brush), typeof(FormsPivot), new PropertyMetadata(default(Brush)));
 
 		CommandBar _commandBar;
 
diff --git a/Xamarin.Forms.Platform.WinRT.Phone/PhoneResources.xaml b/Xamarin.Forms.Platform.WinRT.Phone/PhoneResources.xaml
index 4dcf4be5..b693a226 100644
--- a/Xamarin.Forms.Platform.WinRT.Phone/PhoneResources.xaml
+++ b/Xamarin.Forms.Platform.WinRT.Phone/PhoneResources.xaml
@@ -242,7 +242,7 @@
         <Setter Property="HeaderTemplate">
             <Setter.Value>
                 <DataTemplate>
-                    <TextBlock Text="{Binding Title}" Foreground="{TemplateBinding ToolbarForeground}" />
+					<TextBlock Text="{Binding Title}" Name="TabbedPageHeaderTextBlock" />
                 </DataTemplate>
             </Setter.Value>
         </Setter>
@@ -452,10 +452,6 @@
 		<local:TabbedPagePresenter Content="{Binding Converter={StaticResource PageToRenderer}}" />
 	</DataTemplate>
 
-	<DataTemplate x:Key="TabbedPageHeader">
-		<TextBlock Text="{Binding Title}" />
-	</DataTemplate>
-
 	<Style x:Key="JumpListGrid" TargetType="GridView">
 		<Setter Property="Background" Value="#80000000" />
 		<Setter Property="ItemTemplate">
diff --git a/Xamarin.Forms.Platform.WinRT.Phone/TabbedPageRenderer.cs b/Xamarin.Forms.Platform.WinRT.Phone/TabbedPageRenderer.cs
index 68cafae3..df4fba71 100644
--- a/Xamarin.Forms.Platform.WinRT.Phone/TabbedPageRenderer.cs
+++ b/Xamarin.Forms.Platform.WinRT.Phone/TabbedPageRenderer.cs
@@ -6,6 +6,7 @@ using Windows.UI.Xaml.Automation;
 using Windows.UI.Xaml.Controls;
 using Windows.UI.Xaml.Media;
 using Xamarin.Forms.Internals;
+using WGrid = Windows.UI.Xaml.Controls.Grid;
 
 namespace Xamarin.Forms.Platform.WinRT
 {
@@ -13,7 +14,8 @@ namespace Xamarin.Forms.Platform.WinRT
 	{
 		public TabbedPagePresenter()
 		{
-			SizeChanged += (s, e) => {
+			SizeChanged += (s, e) =>
+			{
 				if (ActualWidth > 0 && ActualHeight > 0)
 				{
 					var tab = ((Page)DataContext);
@@ -26,6 +28,18 @@ namespace Xamarin.Forms.Platform.WinRT
 	public class TabbedPageRenderer
 		: IVisualElementRenderer, ITitleProvider
 	{
+		const string TabBarHeaderTextBlockName = "TabbedPageHeaderTextBlock";
+		const string TabBarHeaderGridName = "TabbedPageHeaderGrid";
+
+		Color _barBackgroundColor;
+		Color _barTextColor;
+		bool _disposed;
+		VisualElementTracker<Page, Pivot> _tracker;
+		bool _showTitle;
+
+		ITitleProvider TitleProvider => this;
+		IPageController PageController => Element as IPageController;
+
 		public event EventHandler<VisualElementChangedEventArgs> ElementChanged;
 
 		public FrameworkElement ContainerElement
@@ -68,15 +82,16 @@ namespace Xamarin.Forms.Platform.WinRT
 			{
 				if (Control == null)
 				{
-					Control = new FormsPivot {
-						Style = (Windows.UI.Xaml.Style)Windows.UI.Xaml.Application.Current.Resources["TabbedPageStyle"]
+					Control = new FormsPivot
+					{
+						Style = (Windows.UI.Xaml.Style)Windows.UI.Xaml.Application.Current.Resources["TabbedPageStyle"],
+						ItemTemplate = (Windows.UI.Xaml.DataTemplate)Windows.UI.Xaml.Application.Current.Resources["TabbedPage"]
 					};
-					Control.HeaderTemplate = (Windows.UI.Xaml.DataTemplate)Windows.UI.Xaml.Application.Current.Resources["TabbedPageHeader"];
-					Control.ItemTemplate = (Windows.UI.Xaml.DataTemplate)Windows.UI.Xaml.Application.Current.Resources["TabbedPage"];
 
 					Control.SelectionChanged += OnSelectionChanged;
 
-					Tracker = new BackgroundTracker<Pivot>(Windows.UI.Xaml.Controls.Control.BackgroundProperty) {
+					Tracker = new BackgroundTracker<Pivot>(Windows.UI.Xaml.Controls.Control.BackgroundProperty)
+					{
 						Element = (Page)element,
 						Control = Control,
 						Container = Control
@@ -88,9 +103,8 @@ namespace Xamarin.Forms.Platform.WinRT
 
 				Control.DataContext = Element;
 				OnPagesChanged(Element.Children, new NotifyCollectionChangedEventArgs(NotifyCollectionChangedAction.Reset));
+
 				UpdateCurrentPage();
-				UpdateBarTextColor();
-				UpdateBarBackgroundColor();
 
 				((INotifyCollectionChanged)Element.Children).CollectionChanged += OnPagesChanged;
 				element.PropertyChanged += OnElementPropertyChanged;
@@ -173,7 +187,7 @@ namespace Xamarin.Forms.Platform.WinRT
 					return;
 				_showTitle = value;
 
-				(Control as FormsPivot).ToolbarVisibility = _showTitle ? Visibility.Visible : Visibility.Collapsed;
+				Control.ToolbarVisibility = _showTitle ? Visibility.Visible : Visibility.Collapsed;
 			}
 		}
 
@@ -195,7 +209,7 @@ namespace Xamarin.Forms.Platform.WinRT
 		{
 			set
 			{
-				(Control as FormsPivot).ToolbarBackground = value;
+				Control.ToolbarBackground = value;
 			}
 		}
 
@@ -203,7 +217,7 @@ namespace Xamarin.Forms.Platform.WinRT
 		{
 			set
 			{
-				(Control as FormsPivot).ToolbarForeground = value;
+				Control.ToolbarForeground = value;
 			}
 		}
 
@@ -214,10 +228,6 @@ namespace Xamarin.Forms.Platform.WinRT
 				changed(this, e);
 		}
 
-		bool _disposed;
-		VisualElementTracker<Page, Pivot> _tracker;
-		bool _showTitle;
-
 		void OnPagesChanged(object sender, NotifyCollectionChangedEventArgs e)
 		{
 			e.Apply(Element.Children, Control.Items);
@@ -238,7 +248,11 @@ namespace Xamarin.Forms.Platform.WinRT
 		void OnElementPropertyChanged(object sender, PropertyChangedEventArgs e)
 		{
 			if (e.PropertyName == nameof(TabbedPage.CurrentPage))
+			{
 				UpdateCurrentPage();
+				UpdateBarTextColor();
+				UpdateBarBackgroundColor();
+			}
 			else if (e.PropertyName == TabbedPage.BarTextColorProperty.PropertyName)
 				UpdateBarTextColor();
 			else if (e.PropertyName == TabbedPage.BarBackgroundColorProperty.PropertyName)
@@ -257,18 +271,14 @@ namespace Xamarin.Forms.Platform.WinRT
 
 		void OnLoaded(object sender, RoutedEventArgs args)
 		{
-			if (Element == null)
-				return;
-
-			((IPageController)Element).SendAppearing();
+			PageController?.SendAppearing();
+			UpdateBarTextColor();
+			UpdateBarBackgroundColor();
 		}
 
 		void OnUnloaded(object sender, RoutedEventArgs args)
 		{
-			if (Element == null)
-				return;
-
-			((IPageController)Element).SendDisappearing();
+			PageController?.SendDisappearing();
 		}
 
 		void OnTrackerUpdated(object sender, EventArgs e)
@@ -287,19 +297,53 @@ namespace Xamarin.Forms.Platform.WinRT
 		Brush GetBarForegroundBrush()
 		{
 			object defaultColor = Windows.UI.Xaml.Application.Current.Resources["AppBarItemForegroundThemeBrush"];
-			if (Element.BarTextColor.IsDefault)
+			if (Element.BarTextColor.IsDefault && defaultColor != null)
 				return (Brush)defaultColor;
 			return Element.BarTextColor.ToBrush();
 		}
 
 		void UpdateBarBackgroundColor()
 		{
-			Control.ToolbarBackground = GetBarBackgroundBrush();
+			if (Element == null) return;
+			var barBackgroundColor = Element.BarBackgroundColor;
+
+			if (barBackgroundColor == _barBackgroundColor) return;
+			_barBackgroundColor = barBackgroundColor;
+
+			var controlToolbarBackground = Control.ToolbarBackground;
+			if (controlToolbarBackground == null && barBackgroundColor.IsDefault) return;
+
+			var brush = GetBarBackgroundBrush();
+			if (brush == controlToolbarBackground) return;
+
+			TitleProvider.BarBackgroundBrush = brush;
+
+			foreach (WGrid tabBarGrid in Control.GetDescendantsByName<WGrid>(TabBarHeaderGridName))
+			{
+				tabBarGrid.Background = brush;
+			}
 		}
 
 		void UpdateBarTextColor()
 		{
-			Control.ToolbarForeground = GetBarForegroundBrush();
+			if (Element == null) return;
+			var barTextColor = Element.BarTextColor;
+
+			if (barTextColor == _barTextColor) return;
+			_barTextColor = barTextColor;
+
+			var controlToolbarForeground = Control.ToolbarForeground;
+			if (controlToolbarForeground == null && barTextColor.IsDefault) return;
+
+			var brush = GetBarForegroundBrush();
+			if (brush == controlToolbarForeground) return;
+
+			TitleProvider.BarForegroundBrush = brush;
+
+			foreach (TextBlock tabBarTextBlock in Control.GetDescendantsByName<TextBlock>(TabBarHeaderTextBlockName))
+			{
+				tabBarTextBlock.Foreground = brush;
+			}
 		}
 
 		void UpdateTitle(Page child)
@@ -314,11 +358,10 @@ namespace Xamarin.Forms.Platform.WinRT
 			{
 				Control.Title = navigationRenderer.Title;
 			}
-			else {
-				((ITitleProvider)this).ShowTitle = false;
+			else
+			{
+				TitleProvider.ShowTitle = false;
 			}
-
 		}
-
 	}
 }
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