﻿using CommonWin32.API;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Data;
using System.Windows.Media;

namespace ModernWPF.Converters
{
    /// <summary>
    /// Inverts a boolean value.
    /// </summary>
    [ValueConversion(typeof(bool), typeof(bool))]
    public class BoolNotConverter : IValueConverter
    {
        static readonly BoolNotConverter _instance = new BoolNotConverter();

        /// <summary>
        /// Gets the singleton instance for this converter.
        /// </summary>
        /// <value>
        /// The instance.
        /// </value>
        public static BoolNotConverter Instance { get { return _instance; } }

        #region IValueConverter Members

        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <param name="value">The value produced by the binding source.</param>
        /// <param name="targetType">The type of the binding target property.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value is bool)
            {
                return !(bool)value;
            }
            return value;
        }

        /// <summary>
        /// Converts a value.
        /// </summary>
        /// <param name="value">The value that is produced by the binding target.</param>
        /// <param name="targetType">The type to convert to.</param>
        /// <param name="parameter">The converter parameter to use.</param>
        /// <param name="culture">The culture to use in the converter.</param>
        /// <returns>
        /// A converted value. If the method returns null, the valid null value is used.
        /// </returns>
        public object ConvertBack(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
        {
            if (value is bool)
            {
                return !(bool)value;
            }
            return value;
        }

        #endregion
    }
}
