close #361

src/Shared/HandyControl_Shared/Themes/Theme.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Windows;
+using HandyControl.Data;
+using HandyControl.Tools;
+
+namespace HandyControl.Themes
+{
+    public class Theme : ResourceDictionary
+    {
+        public Theme() => UpdateResource();
+
+        private SkinType _skin;
+
+        public virtual SkinType Skin
+        {
+            get => _skin;
+            set
+            {
+                if (_skin == value) return;
+                _skin = value;
+
+                UpdateResource();
+            }
+        }
+
+        public string Name { get; set; }
+
+        public virtual Uri ThemeUri => new Uri("pack://application:,,,/HandyControl;component/Themes/Theme.xaml");
+
+        public virtual ResourceDictionary GetSkin(SkinType skinType) => ResourceHelper.GetSkin(skinType);
+
+        private void UpdateResource()
+        {
+            base.MergedDictionaries.Clear();
+            base.MergedDictionaries.Add(GetSkin(Skin));
+            base.MergedDictionaries.Add(new ResourceDictionary
+            {
+                Source = ThemeUri
+            });
+        }
+
+        public new Collection<ResourceDictionary> MergedDictionaries => throw new NotSupportedException();
+    }
+}