WIP

2024-11-20 21:00:09 +00:00
parent 736fd2802b
commit 8466d23aa6
8 changed files with 129 additions and 98 deletions
@@ -0,0 +1,57 @@
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Data;
+using Toolkit.Foundation;
+
+namespace Toolkit.UI.WinUI;
+
+[Bindable]
+public static class ContentTemplateBinding
+{
+    public static readonly DependencyProperty IsAttachedProperty =
+        DependencyProperty.RegisterAttached("IsAttached",
+            typeof(bool), typeof(ContentTemplateBinding),
+                new PropertyMetadata(false, OnAttachLoadedEventChanged));
+
+    public static bool GetIsAttached(DependencyObject dependencyObject) =>
+        (bool)dependencyObject.GetValue(IsAttachedProperty);
+
+    public static void SetIsAttached(DependencyObject
+        dependencyObject, bool value) => dependencyObject.SetValue(IsAttachedProperty, value);
+
+    private static void OnAttachLoadedEventChanged(DependencyObject dependencyObject,
+        DependencyPropertyChangedEventArgs args)
+    {
+        if (dependencyObject is FrameworkElement content)
+        {
+            void HandleLoaded(object sender, RoutedEventArgs args)
+            {
+                if (content.DataContext is IActivation activation)
+                {
+                    content.Loaded -= HandleLoaded;
+                    activation.IsActive = true;
+                }
+            }
+
+            void HandleUnloaded(object sender, RoutedEventArgs args)
+            {
+                if (content.DataContext is IActivation activation)
+                {
+                    content.Unloaded -= HandleUnloaded;
+                    activation.IsActive = false;
+                }
+            }
+
+            if ((bool)args.NewValue)
+            {
+                content.Loaded += HandleLoaded;
+                content.Unloaded += HandleUnloaded;
+
+            }
+            else
+            {
+                content.Loaded -= HandleLoaded;
+                content.Unloaded -= HandleUnloaded;
+            }
+        }
+    }
+}