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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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