Black Theme for the WPF App

LaDOSE.Src/LaDOSE.DesktopApp/Themes/LeftMarginMultiplierConverter.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+
+namespace DarkBlendTheme
+{
+    public class LeftMarginMultiplierConverter : IValueConverter
+    {
+        public double Length { get; set; }
+
+        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            var item = value as TreeViewItem;
+            if (item == null)
+                return new Thickness(0);
+
+            return new Thickness(Length * item.GetDepth(), 0, 0, 0);
+        }
+
+        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+        {
+            throw new System.NotImplementedException();
+        }
+    }
+}