Add some initial navigation route handlers

2022-12-09 08:58:26 +00:00
parent fdcce769e5
commit 4c8fd3dae4
34 changed files with 403 additions and 343 deletions
@@ -1,9 +1,39 @@
 using Avalonia.Controls.Primitives;
+using Avalonia.Interactivity;
+using Mediator;

 namespace Toolkit.Foundation.Avalonia
 {
-    //public abstract class NavigationRouteHandler<TTarget> : IRecipient<NavigationRouteRequest<TTarget>> where TTarget : TemplatedControl
-    //{
-    //    public abstract void Receive(NavigationRouteRequest<TTarget> message);
-    //}
+    public class NavigationRouteHandler : IRequestHandler<NavigationRoute>
+    {
+        private readonly INavigationRouteDescriptorCollection descriptors;
+
+        public NavigationRouteHandler(INavigationRouteDescriptorCollection descriptors)
+        {
+            this.descriptors = descriptors;
+        }
+
+        public ValueTask<Unit> Handle(NavigationRoute request, CancellationToken cancellationToken)
+        {
+            if (request.Route is TemplatedControl control)
+            {
+                void HandleUnloaded(object? sender, RoutedEventArgs args)
+                {
+                    if (descriptors.FirstOrDefault(x => x.Route == sender) is INavigationRouteDescriptor descriptor)
+                    {
+                        descriptors.Remove(descriptor);
+                    }
+                }
+                control.Unloaded += HandleUnloaded;
+            }
+
+            if (descriptors.FirstOrDefault(x => x.Name == request.Name) is INavigationRouteDescriptor descriptor)
+            {
+                descriptors.Remove(descriptor);
+            }
+
+            descriptors.Add(new NavigationRouteDescriptor(request.Name, request.Route));
+            return default;
+        }
+    }
 }