Add project files.

2022-11-01 15:26:08 +00:00
parent daa7b59f22
commit 7e4f880821
408 changed files with 16863 additions and 0 deletions
@@ -0,0 +1,46 @@
+using System;
+using System.Windows;
+using System.Windows.Data;
+using TheXamlGuy.Framework.Core;
+using TheXamlGuy.UI.WPF;
+
+namespace TheXamlGuy.Framework.WPF
+{
+    public class NavigateBackExtension : TriggerExtension
+    {
+        private static readonly DependencyProperty EventAggregatorProperty =
+            DependencyProperty.RegisterAttached("EventAggregator",
+                typeof(IEventAggregator), typeof(NavigateBackExtension));
+
+        private static readonly DependencyProperty RouteProperty =
+            DependencyProperty.RegisterAttached("Route",
+                typeof(object), typeof(NavigateBackExtension));
+
+        private readonly Binding eventAggregatorBinding;
+        private readonly Binding routeBinding;
+
+        public NavigateBackExtension(object eventAggregator, 
+            object? route)
+        {
+            eventAggregatorBinding = eventAggregator.ToBinding();
+            routeBinding = route.ToBinding();
+        }
+
+        protected override void OnInvoked(object sender, EventArgs args)
+        {
+            BindingOperations.SetBinding(TargetObject, EventAggregatorProperty, eventAggregatorBinding);
+            if (TargetObject?.GetValue(EventAggregatorProperty) is IEventAggregator eventAggregator)
+            {
+                BindingOperations.SetBinding(TargetObject, RouteProperty, routeBinding);
+                if (TargetObject.GetValue(RouteProperty) is { } toTarget)
+                {
+                    eventAggregator.Publish(new NavigateBack(toTarget));
+                }
+
+                return;
+            }
+
+            base.OnInvoked(sender, args);
+        }
+    }
+}