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butterflow-ui/InverseBoolConverter.cs

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+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Data;
+
+namespace butterflow_ui
+{
+    /// <summary> An inverse boolean converter. </summary>
+    [ValueConversion(typeof(bool), typeof(bool))]
+    public class InverseBoolConverter : IValueConverter
+    {
+        /// <summary> Converts a boolean to its inverse. </summary>
+        /// <exception cref="InvalidCastException"> Thrown when an object cannot be cast to a required
+        ///                                         type. </exception>
+        /// <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 <see langword="null" />, the valid null value is
+        /// used.
+        /// </returns>
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if(targetType == typeof(bool))
+            {
+                return !(bool)value;
+            }
+
+            throw new InvalidCastException(string.Format("Cannot convert type {0} to boolean.", targetType.Name));
+        }
+
+        /// <summary> Converts an inverse boolean back to its original state. </summary>
+        /// <exception cref="InvalidCastException"> Thrown when an object cannot be cast to a required
+        ///                                         type. </exception>
+        /// <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 <see langword="null" />, the valid null value is
+        /// used.
+        /// </returns>
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if (targetType == typeof(bool))
+            {
+                return !(bool)value;
+            }
+
+            throw new InvalidCastException(string.Format("Cannot convert type {0} to boolean.", targetType.Name));
+        }
+    }
+}