Initial WinUI switch.

Wino.Core.WinUI/Models/Personalization/CustomAppTheme.cs

@@ -0,0 +1,30 @@
+using System;
+using System.Threading.Tasks;
+using Windows.Storage;
+using Wino.Core.Domain.Enums;
+using Wino.Core.Domain.Models.Personalization;
+using Wino.Services;
+
+namespace Wino.Core.UWP.Models.Personalization;
+
+/// <summary>
+/// Custom themes that are generated by users.
+/// </summary>
+public class CustomAppTheme : AppThemeBase
+{
+    public CustomAppTheme(CustomThemeMetadata metadata) : base(metadata.Name, metadata.Id)
+    {
+        AccentColor = metadata.AccentColorHex;
+    }
+
+    public override AppThemeType AppThemeType => AppThemeType.Custom;
+
+    public override string GetBackgroundPreviewImagePath()
+        => $"ms-appdata:///local/{ThemeService.CustomThemeFolderName}/{Id}_preview.jpg";
+
+    public override async Task<string> GetThemeResourceDictionaryContentAsync()
+    {
+        var customAppThemeFile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Wino.Core.UWP/AppThemes/Custom.xaml"));
+        return await FileIO.ReadTextAsync(customAppThemeFile);
+    }
+}