Initial import

1 files changed, 75 insertions, 0 deletions

diff --git a/Xamarin.Forms.Platform.WinRT/MasterBackgroundConverter.cs b/Xamarin.Forms.Platform.WinRT/MasterBackgroundConverter.cs
new file mode 100644
index 00000000..aa82f56d
--- /dev/null
+++ b/Xamarin.Forms.Platform.WinRT/MasterBackgroundConverter.cs
@@ -0,0 +1,75 @@
+using System;
+using Windows.UI;
+using Windows.UI.Xaml;
+using Windows.UI.Xaml.Controls;
+using Windows.UI.Xaml.Media;
+
+#if WINDOWS_UWP
+
+namespace Xamarin.Forms.Platform.UWP
+#else
+
+namespace Xamarin.Forms.Platform.WinRT
+#endif
+{
+	public class MasterBackgroundConverter : Windows.UI.Xaml.Data.IValueConverter
+	{
+		// Obtained by comparing the Mail apps master section background to the detail background
+		const double Shift = 0.03;
+
+		public object Convert(object value, Type targetType, object parameter, string language)
+		{
+			SolidColorBrush brush = null;
+
+			var element = value as FrameworkElement;
+			if (element != null)
+			{
+				while (brush == null && element != null)
+				{
+					DependencyProperty property = GetBackgroundProperty(element);
+					if (property != null)
+					{
+						value = element.GetValue(property);
+						brush = value as SolidColorBrush;
+						if (brush != null && brush.Color == Colors.Transparent)
+							brush = null;
+					}
+
+					element = VisualTreeHelper.GetParent(element) as FrameworkElement;
+				}
+			}
+
+			brush = value as SolidColorBrush;
+			if (brush != null)
+			{
+				Windows.UI.Color wcolor = brush.Color;
+				Color color = Color.FromRgba(wcolor.R, wcolor.G, wcolor.B, wcolor.A);
+
+				double delta = Shift;
+				if (color.Luminosity > .6)
+					delta = -Shift;
+
+				color = color.AddLuminosity(delta);
+
+				return new SolidColorBrush(color.ToWindowsColor());
+			}
+
+			return null;
+		}
+
+		public object ConvertBack(object value, Type targetType, object parameter, string language)
+		{
+			throw new NotImplementedException();
+		}
+
+		static DependencyProperty GetBackgroundProperty(FrameworkElement element)
+		{
+			if (element is Control)
+				return Control.BackgroundProperty;
+			if (element is Panel)
+				return Panel.BackgroundProperty;
+
+			return null;
+		}
+	}
+}
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