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 +1,94 @@
+using System;
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Data;
+using System.Windows.Markup;
+using TheXamlGuy.UI.WPF;
+
+namespace TheXamlGuy.Framework.WPF
+{
+    [MarkupExtensionReturnType(typeof(Control))]
+    public class RouteExtension : MarkupExtension
+    {
+        private static readonly DependencyProperty RouteProperty =
+            DependencyProperty.RegisterAttached("Route",
+                typeof(IRoute), typeof(RouteExtension));
+
+        private readonly string name;
+        private readonly Binding routeBinding;
+        private PropertyChangedRevoker? dataContextPropertyChangedRevoker;
+
+        public RouteExtension(object route, string name)
+        {
+            routeBinding = route.ToBinding();
+            this.name = name;
+        }
+
+        private bool TryGetDataContext(DependencyObject target, out object dataContext)
+        {
+            dataContext = target.GetValue(FrameworkElement.DataContextProperty) ?? target.GetValue(FrameworkContentElement.DataContextProperty);
+            return dataContext is not null;
+        }
+
+        public override object? ProvideValue(IServiceProvider serviceProvider)
+        {
+            if (dataContextPropertyChangedRevoker is not null)
+            {
+                dataContextPropertyChangedRevoker.Dispose();
+                dataContextPropertyChangedRevoker = null;
+            }
+
+            if (serviceProvider.GetService(typeof(IProvideValueTarget)) is IProvideValueTarget target)
+            {
+                if (target.TargetObject is FrameworkElement frameworkElement)
+                {
+                    if (!TryGetDataContext(frameworkElement, out object dataContext))
+                    {
+                        dataContextPropertyChangedRevoker = new PropertyChangedRevoker(frameworkElement, FrameworkElement.DataContextProperty, OnDataContextPropertyChangedChanged);
+                        void OnDataContextPropertyChangedChanged(object sender, DependencyPropertyChangedEventArgs _)
+                        {
+                            if (TryGetDataContext(frameworkElement, out dataContext))
+                            {
+                                frameworkElement.Loaded -= HandleLoaded;
+
+                                BindingOperations.SetBinding(frameworkElement, RouteProperty, routeBinding);
+                                if (frameworkElement?.GetValue(RouteProperty) is IRoute route)
+                                {
+                                    route.AddRoute(name, frameworkElement);
+                                    BindingOperations.ClearBinding(frameworkElement, RouteProperty);
+                                }
+                            }
+                        }
+
+                        void HandleLoaded(object sender, RoutedEventArgs args)
+                        {
+                            frameworkElement.Loaded -= HandleLoaded;
+                            if (TryGetDataContext(frameworkElement, out dataContext))
+                            {
+                                BindingOperations.SetBinding(frameworkElement, RouteProperty, routeBinding);
+                                if (frameworkElement?.GetValue(RouteProperty) is IRoute route)
+                                {
+                                    route.AddRoute(name, frameworkElement);
+                                    BindingOperations.ClearBinding(frameworkElement, RouteProperty);
+                                }
+                            }
+                        }
+
+                        frameworkElement.Loaded += HandleLoaded;
+                    }
+                    else
+                    {
+                        BindingOperations.SetBinding(frameworkElement, RouteProperty, routeBinding);
+                        if (frameworkElement?.GetValue(RouteProperty) is IRoute route)
+                        {
+                            route.AddRoute(name, frameworkElement);
+                            BindingOperations.ClearBinding(frameworkElement, RouteProperty);
+                        }
+                    }
+                }
+            }
+
+            return null;
+        }
+    }
+}