port from perforce

intromat/Intromat/Converters/WidthToMarginConverter.cs

@@ -0,0 +1,23 @@
+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace Intromat.Converters
+{
+    public class WidthToMarginConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var width = (double)value;
+            return Side ? new Thickness(-width, 0, 0, 0) : new Thickness(0, 0, -width, 0);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+
+        public bool Side { get; set; }
+    }
+}