FISLib_Old/FISSDK/FISSDKDemo/Extensions/RevertBoolConverterExtension.cs

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

namespace FISSDKDemo.Extensions
{
    [MarkupExtensionReturnType(typeof(IValueConverter))]
    class RevertBoolConverterExtension : MarkupExtension, IValueConverter
    {
        private static RevertBoolConverterExtension _revertBoolConverter;

        static RevertBoolConverterExtension()
        {
            _revertBoolConverter = new RevertBoolConverterExtension();
        }

        public override object ProvideValue(IServiceProvider serviceProvider)
        {
            return _revertBoolConverter ?? (_revertBoolConverter = new RevertBoolConverterExtension());
        }

        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is bool boolValue)
            {
                return !boolValue;
            }

            return false;
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (value is bool boolValue)
            {
                return !boolValue;
            }

            return false;
        }
    }
}