From 66f4bb87576e95d25b51272a08f36e9a590e7214 Mon Sep 17 00:00:00 2001
From: TheXamlGuy <dan_clark@outlook.com>
Date: Sat, 13 Jan 2024 13:47:26 +0000
Subject: [PATCH] UI threading work

---
 Hyperbar.Windows/App.xaml.cs                       |  5 ++++-
 Hyperbar.Windows/Lifecycles/AppConfiguration.cs    |  8 ++++++++
 Hyperbar.Windows/Lifecycles/AppInitializer.cs      |  5 +++--
 .../Lifecycles/ConfigurationChangedHandler.cs      | 14 ++++++++++++++
 Hyperbar/Mediators/Mediator.cs                     |  8 ++++++--
 5 files changed, 35 insertions(+), 5 deletions(-)
 create mode 100644 Hyperbar.Windows/Lifecycles/AppConfiguration.cs
 create mode 100644 Hyperbar.Windows/Lifecycles/ConfigurationChangedHandler.cs

diff --git a/Hyperbar.Windows/App.xaml.cs b/Hyperbar.Windows/App.xaml.cs
index f4b0f78..13cf47e 100644
--- a/Hyperbar.Windows/App.xaml.cs
+++ b/Hyperbar.Windows/App.xaml.cs
@@ -39,14 +39,17 @@ public partial class App :
                 services.AddSingleton<IDisposer, Disposer>();
 
                 services.AddHostedService<AppService>();
+                services.AddConfiguration<AppConfiguration>();
 
                 services.AddTransient<IInitializer, AppInitializer>();
                 services.AddTransient<ITemplateFactory, TemplateFactory>();
 
-                services.AddTransient<DesktopFlyout>();
+                services.AddSingleton<DesktopFlyout>();
 
                 services.AddContentTemplate<WidgetBarViewModel, WidgetBarView>();
 
+                services.AddHandler<AppConfigurationChangedHandler>();
+
                 //services.AddWidgetProvider<MediaControllerWidgetProvider>();
                 services.AddWidgetProvider<PrimaryWidgetProvider>();
 
diff --git a/Hyperbar.Windows/Lifecycles/AppConfiguration.cs b/Hyperbar.Windows/Lifecycles/AppConfiguration.cs
new file mode 100644
index 0000000..2ea0375
--- /dev/null
+++ b/Hyperbar.Windows/Lifecycles/AppConfiguration.cs
@@ -0,0 +1,8 @@
+using Hyperbar.Windows.Controls;
+
+namespace Hyperbar.Windows;
+
+public class AppConfiguration
+{
+    public DesktopFlyoutPlacement Placement { get; set; }
+}
diff --git a/Hyperbar.Windows/Lifecycles/AppInitializer.cs b/Hyperbar.Windows/Lifecycles/AppInitializer.cs
index 5236278..2958e48 100644
--- a/Hyperbar.Windows/Lifecycles/AppInitializer.cs
+++ b/Hyperbar.Windows/Lifecycles/AppInitializer.cs
@@ -5,14 +5,15 @@ namespace Hyperbar.Windows;
 
 public class AppInitializer([FromKeyedServices(nameof(WidgetBarViewModel))] WidgetBarView view,
     [FromKeyedServices(nameof(WidgetBarViewModel))] WidgetBarViewModel viewModel,
-    DesktopFlyout desktopFlyout) :
+    DesktopFlyout desktopFlyout, 
+    AppConfiguration configuration) :
     IInitializer
 {
     public Task InitializeAsync()
     {
         view.DataContext = viewModel;
 
-        desktopFlyout.Placement = DesktopFlyoutPlacement.Top;
+        desktopFlyout.Placement = configuration.Placement;
         desktopFlyout.Content = view;
 
         return Task.CompletedTask;
diff --git a/Hyperbar.Windows/Lifecycles/ConfigurationChangedHandler.cs b/Hyperbar.Windows/Lifecycles/ConfigurationChangedHandler.cs
new file mode 100644
index 0000000..8537e05
--- /dev/null
+++ b/Hyperbar.Windows/Lifecycles/ConfigurationChangedHandler.cs
@@ -0,0 +1,14 @@
+using Hyperbar.Windows.Controls;
+
+namespace Hyperbar.Windows.Primary;
+
+public class AppConfigurationChangedHandler(DesktopFlyout desktopFlyout,
+    AppConfiguration configuration) :
+    INotificationHandler<ConfigurationChanged<AppConfiguration>>
+{
+    public ValueTask Handle(ConfigurationChanged<AppConfiguration> notification, CancellationToken cancellationToken)
+    {
+        desktopFlyout.Placement = configuration.Placement;
+        return ValueTask.CompletedTask;
+    }
+}
diff --git a/Hyperbar/Mediators/Mediator.cs b/Hyperbar/Mediators/Mediator.cs
index cf1e045..96e5135 100644
--- a/Hyperbar/Mediators/Mediator.cs
+++ b/Hyperbar/Mediators/Mediator.cs
@@ -6,9 +6,11 @@ namespace Hyperbar;
 public class Mediator(IServiceProvider provider) :
     IMediator
 {
+    private readonly SynchronizationContext? context = SynchronizationContext.Current;
+
     private readonly ConditionalWeakTable<Type, dynamic> subjects = [];
 
-    public async ValueTask PublishAsync<TNotification>(TNotification notification,
+    public ValueTask PublishAsync<TNotification>(TNotification notification,
         CancellationToken cancellationToken = default)
         where TNotification :
         INotification
@@ -26,8 +28,10 @@ public class Mediator(IServiceProvider provider) :
 
         foreach (INotificationHandler<TNotification> handler in handlers)
         {
-            await handler.Handle(notification, cancellationToken);
+            context?.Post(async state => await handler.Handle(notification, cancellationToken), null);
         }
+
+        return ValueTask.CompletedTask;
     }
 
     public ValueTask<TResponse> SendAsync<TResponse>(IRequest<TResponse> request,