Initial

BrightSharp/Converters/ThicknessConverter.cs

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+using System;
+using System.Globalization;
+using System.Windows;
+using System.Windows.Data;
+
+namespace BrightSharp.Converters
+{
+    internal class ThicknessConverter : IValueConverter
+    {
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            if(value is Thickness)
+            {
+                var offset = double.Parse(parameter.ToString(), CultureInfo.InvariantCulture.NumberFormat);
+                var thick = (Thickness)value;
+
+                return new Thickness(Math.Max(0, thick.Left + offset),
+                    Math.Max(0, thick.Top + offset),
+                    Math.Max(0, thick.Right + offset),
+                    Math.Max(0, thick.Bottom + offset));
+            }
+            else if(value is CornerRadius)
+            {
+                var offset = double.Parse(parameter.ToString(), CultureInfo.InvariantCulture.NumberFormat);
+                var thick = (CornerRadius)value;
+
+                return new CornerRadius(Math.Max(0, thick.TopLeft + offset),
+                    Math.Max(0, thick.TopRight + offset),
+                    Math.Max(0, thick.BottomRight + offset),
+                    Math.Max(0, thick.BottomLeft + offset));
+            }
+            return value;
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}