close #361

src/Shared/HandyControl_Shared/HandyControl_Shared.projitems

@@ -84,6 +84,7 @@
     <Compile Include="$(MSBuildThisFileDirectory)Media\Effects\ContrastEffect.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Media\Effects\EffectBase.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Media\Effects\GrayScaleEffect.cs" />
+    <Compile Include="$(MSBuildThisFileDirectory)Themes\Theme.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Converter\BorderCircularClipConverter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Converter\ColLayoutConverter.cs" />
     <Compile Include="$(MSBuildThisFileDirectory)Tools\Converter\CornerRadiusSplitConverter.cs" />

src/Shared/HandyControl_Shared/Properties/CoreAssemblyInfo.cs

@@ -10,4 +10,5 @@
 [assembly: XmlnsDefinition("https://handyorg.github.io/handycontrol", "HandyControl.Media.Effects")]
 [assembly: XmlnsDefinition("https://handyorg.github.io/handycontrol", "HandyControl.Data")]
 [assembly: XmlnsDefinition("https://handyorg.github.io/handycontrol", "HandyControl.Properties.Langs")]
+[assembly: XmlnsDefinition("https://handyorg.github.io/handycontrol", "HandyControl.Themes")]
 [assembly: XmlnsPrefix("https://handyorg.github.io/handycontrol", "hc")]

src/Shared/HandyControl_Shared/Properties/NetAssemblyInfo.cs

@@ -23,4 +23,5 @@ using System.Runtime.InteropServices;
 [assembly: XmlnsDefinition("https://handyorg.github.io/handycontrol", "HandyControl.Media.Effects")]
 [assembly: XmlnsDefinition("https://handyorg.github.io/handycontrol", "HandyControl.Data")]
 [assembly: XmlnsDefinition("https://handyorg.github.io/handycontrol", "HandyControl.Properties.Langs")]
+[assembly: XmlnsDefinition("https://handyorg.github.io/handycontrol", "HandyControl.Themes")]
 [assembly: XmlnsPrefix("https://handyorg.github.io/handycontrol", "hc")]

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();
+    }
+}

src/Shared/HandyControl_Shared/Tools/Helper/ResourceHelper.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using System.Reflection;
 using System.Windows;
 using HandyControl.Data;
+using HandyControl.Themes;
 
 namespace HandyControl.Tools
 {
@@ -85,5 +86,12 @@ namespace HandyControl.Tools
                 };
             }        
         }
+
+        public static Theme GetTheme(string name, ResourceDictionary resourceDictionary)
+        {
+            if (string.IsNullOrEmpty(name) || resourceDictionary == null) return null;
+            return resourceDictionary.MergedDictionaries.OfType<Theme>()
+                .FirstOrDefault(item => Equals(item.Name, name));
+        }
     }
 }