优化更新代码，添加界面功能并整合

WPFluent/Services/ThemeService.cs

@@ -0,0 +1,79 @@
+
+
+
+using WPFluent.Appearance;
+
+namespace WPFluent;
+
+/// <summary>
+/// Lets you set the app theme.
+/// </summary>
+public partial class ThemeService : IThemeService
+{
+    /// <inheritdoc/>
+    public virtual SystemTheme GetNativeSystemTheme() => ApplicationThemeManager.GetSystemTheme();
+
+    /// <inheritdoc/>
+    public virtual ApplicationTheme GetSystemTheme()
+    {
+        SystemTheme systemTheme = ApplicationThemeManager.GetSystemTheme();
+
+        return systemTheme switch
+        {
+            SystemTheme.Light => ApplicationTheme.Light,
+            SystemTheme.Dark => ApplicationTheme.Dark,
+            SystemTheme.Glow => ApplicationTheme.Dark,
+            SystemTheme.CapturedMotion => ApplicationTheme.Dark,
+            SystemTheme.Sunrise => ApplicationTheme.Light,
+            SystemTheme.Flow => ApplicationTheme.Light,
+            SystemTheme.HCBlack => ApplicationTheme.HighContrast,
+            SystemTheme.HC1 => ApplicationTheme.HighContrast,
+            SystemTheme.HC2 => ApplicationTheme.HighContrast,
+            SystemTheme.HCWhite => ApplicationTheme.HighContrast,
+            _ => ApplicationTheme.Unknown,
+        };
+    }
+
+    /// <inheritdoc/>
+    public virtual ApplicationTheme GetTheme() => ApplicationThemeManager.GetAppTheme();
+
+    /// <inheritdoc/>
+    public bool SetAccent(Color accentColor)
+    {
+        ApplicationAccentColorManager.Apply(accentColor);
+
+        return true;
+    }
+
+    /// <inheritdoc/>
+    public bool SetAccent(SolidColorBrush accentSolidBrush)
+    {
+        Color color = accentSolidBrush.Color;
+        color.A = (byte)Math.Round(accentSolidBrush.Opacity * byte.MaxValue);
+
+        ApplicationAccentColorManager.Apply(color);
+
+        return true;
+    }
+
+    /// <inheritdoc/>
+    public bool SetSystemAccent()
+    {
+        ApplicationAccentColorManager.ApplySystemAccent();
+
+        return true;
+    }
+
+    /// <inheritdoc/>
+    public virtual bool SetTheme(ApplicationTheme applicationTheme)
+    {
+        if(ApplicationThemeManager.GetAppTheme() == applicationTheme)
+        {
+            return false;
+        }
+
+        ApplicationThemeManager.Apply(applicationTheme);
+
+        return true;
+    }
+}