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QuickLook.Plugin/QuickLook.Plugin.ArchiveViewer/Extensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Windows;
+using System.Windows.Media;
+
+namespace QuickLook.Plugin.ArchiveViewer
+{
+    public static class Extensions
+    {
+        public static void ForEach<T>(this IEnumerable<T> enumeration, Action<T> action)
+        {
+            foreach (var item in enumeration)
+                action(item);
+        }
+
+        public static T GetDescendantByType<T>(this Visual element) where T : class
+        {
+            if (element == null)
+                return default(T);
+            if (element.GetType() == typeof(T))
+                return element as T;
+
+            T foundElement = null;
+            (element as FrameworkElement)?.ApplyTemplate();
+
+            for (var i = 0; i < VisualTreeHelper.GetChildrenCount(element); i++)
+            {
+                var visual = VisualTreeHelper.GetChild(element, i) as Visual;
+                foundElement = visual.GetDescendantByType<T>();
+                if (foundElement != null)
+                    break;
+            }
+            return foundElement;
+        }
+
+        public static string ToPrettySize(this ulong value, int decimalPlaces = 0)
+        {
+            const long OneKb = 1024;
+            const long OneMb = OneKb * 1024;
+            const long OneGb = OneMb * 1024;
+            const long OneTb = OneGb * 1024;
+
+            var asTb = Math.Round((double) value / OneTb, decimalPlaces);
+            var asGb = Math.Round((double) value / OneGb, decimalPlaces);
+            var asMb = Math.Round((double) value / OneMb, decimalPlaces);
+            var asKb = Math.Round((double) value / OneKb, decimalPlaces);
+            var chosenValue = asTb > 1
+                ? $"{asTb} TB"
+                : asGb > 1
+                    ? $"{asGb} GB"
+                    : asMb > 1
+                        ? $"{asMb} MB"
+                        : asKb > 1
+                            ? $"{asKb} KB"
+                            : $"{Math.Round((double) value, decimalPlaces)} bytes";
+
+            return chosenValue;
+        }
+    }
+}