BoolToVisibilityConverter.cs

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

namespace Sharp.Utils.Wpf
{
    /// <summary>
    /// Converts a <see cref="System.Boolean"/> value to customizable <see cref="System.Windows.Visibility"/> values.
    /// </summary>
    [ValueConversion(typeof(bool), typeof(Visibility))]
    public sealed class BoolToVisibilityConverter : IValueConverter
    {
        /// <summary>
        /// The Visibility value to use when the source value is <value>true</value>.
        /// </summary>
        public Visibility TrueValue { get; set; }

        /// <summary>
        /// The Visibility value to use when the source value is <value>false</value>.
        /// </summary>
        public Visibility FalseValue { get; set; }

        /// <summary>
        /// Creates a new <see cref="BoolToVisibilityConverter"/> instance.
        /// </summary>
        public BoolToVisibilityConverter()
        {
            TrueValue = Visibility.Visible;
            FalseValue = Visibility.Collapsed;
        }

        /// <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>The converted value.</returns>
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (!(value is bool))
                return null;
            return (bool)value ? TrueValue : FalseValue;
        }

        /// <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>The converted value.</returns>
        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            if (Equals(value, TrueValue))
                return true;
            if (Equals(value, FalseValue))
                return false;
            return null;
        }
    }
}