Added playlists view. Added messaging service. Added logic for adding and deleting playlists.

Harmonia.WinUI/Messaging/WindowsMessageService.cs

@@ -0,0 +1,30 @@
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+using System;
+using System.Threading.Tasks;
+
+namespace Harmonia.WinUI.Messaging;
+
+public class WindowsMessageService : IMessageService
+{
+    private static MainWindow MainWindow => App.ServiceProvider.GetRequiredService<MainWindow>();
+
+    public async Task<bool> ConfirmAsync(string title, string message)
+    {
+        ContentDialog dialog = new()
+        {
+            XamlRoot = MainWindow.Content.XamlRoot,
+            Style = Application.Current.Resources["DefaultContentDialogStyle"] as Style,
+            Title = title,
+            Content = message,
+            PrimaryButtonText = "Yes",
+            CloseButtonText = "No",
+            DefaultButton = ContentDialogButton.Primary
+        };
+
+        var result = await dialog.ShowAsync();
+
+        return result == ContentDialogResult.Primary;
+    }
+}