Initial commit

Extensions/FontExtensions.cs

@@ -0,0 +1,43 @@
+using System.Collections.Generic;
+using System.Linq;
+using System.Windows.Media;
+using Microsoft.Win32;
+
+namespace Common.Wpf.Extensions
+{
+    public static class FontExtensions
+    {
+        public static bool IsComposite(FontFamily fontFamily)
+        {
+            return fontFamily.Source.StartsWith("Global");
+        }
+
+        public static bool IsSymbol(FontFamily fontFamily)
+        {
+            Typeface typeface = fontFamily.GetTypefaces().First();
+            GlyphTypeface glyph;
+            typeface.TryGetGlyphTypeface(out glyph);
+            return glyph.Symbol;
+        }
+
+        public static bool IsVisible(FontFamily fontFamily)
+        {
+            return !IsHidden(fontFamily);
+        }
+
+        public static bool IsHidden(FontFamily fontFamily)
+        {
+            const string fontManagementKey = @"Software\Microsoft\Windows NT\CurrentVersion\Font Management";
+            const string inactiveFontsValue = "Inactive Fonts";
+
+            RegistryKey key = Registry.CurrentUser.OpenSubKey(fontManagementKey);
+
+            if (key == null)
+                return false;
+
+            IEnumerable<string> hiddenFonts = (string[]) key.GetValue(inactiveFontsValue);
+
+            return hiddenFonts.Contains(fontFamily.Source);
+        }
+    }
+}