using System;
using System.Globalization;
using System.Windows.Data;
using System.Windows.Markup;

namespace Gestor.Application.Converters
{
	public class ActualHeightConverter : MarkupExtension, IValueConverter
	{
		public ActualHeightConverter()
		{
		}

		public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
		{
			if (value == null)
			{
				return 0;
			}
			return (double)value - 20;
		}

		public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
		{
			return null;
		}

		public override object ProvideValue(IServiceProvider serviceProvider)
		{
			return this;
		}
	}
}