Added ItemContainerInvokedBehavior

2025-02-11 14:56:16 +00:00
parent f6e55b7a21
commit 95dd84d323
4 changed files with 99 additions and 12 deletions
@@ -0,0 +1,86 @@
+using Microsoft.UI.Xaml;
+using System;
+using Microsoft.UI.Xaml.Controls;
+using Microsoft.UI.Xaml.Media;
+using Microsoft.Xaml.Interactivity;
+
+namespace Toolkit.UI.WinUI;
+
+public class ItemContainerInvokedBehavior : 
+    Trigger<ItemContainer>
+{
+    private ItemsView? itemsView;
+
+    protected override void OnAttached()
+    {
+        base.OnAttached();
+        if (AssociatedObject is not null)
+        {
+            AssociatedObject.Loaded += OnLoaded;
+            AssociatedObject.Unloaded += OnUnloaded;
+        }
+    }
+
+    protected override void OnDetaching()
+    {
+        base.OnDetaching();
+        if (AssociatedObject is not null)
+        {
+            AssociatedObject.Loaded -= OnLoaded;
+            AssociatedObject.Unloaded -= OnUnloaded;
+        }
+        DetachFromItemsView();
+    }
+
+    private void OnLoaded(object sender, RoutedEventArgs args)
+    {
+        if (AssociatedObject is not null)
+        {
+            itemsView = FindAncestor<ItemsView>(AssociatedObject);
+            if (itemsView is not null)
+            {
+                itemsView.SelectionChanged += OnSelectionChanged;
+            }
+        }
+    }
+
+    private void OnUnloaded(object sender, RoutedEventArgs args)
+    {
+        DetachFromItemsView();
+        if (AssociatedObject is not null)
+        {
+            AssociatedObject.Loaded -= OnLoaded;
+            AssociatedObject.Unloaded -= OnUnloaded;
+        }
+    }
+
+    private void DetachFromItemsView()
+    {
+        if (itemsView is not null)
+        {
+            itemsView.SelectionChanged -= OnSelectionChanged;
+            itemsView = null;
+        }
+    }
+
+    private static T? FindAncestor<T>(DependencyObject current) where T : DependencyObject
+    {
+        while (current != null)
+        {
+            if (current is T ancestor)
+            {
+                return ancestor;
+            }
+            current = VisualTreeHelper.GetParent(current);
+        }
+        return null;
+    }
+
+    private void OnSelectionChanged(ItemsView sender, ItemsViewSelectionChangedEventArgs args)
+    {
+        if (itemsView is not null && AssociatedObject is not null && AssociatedObject.DataContext == itemsView.SelectedItem)
+        {
+            Interaction.ExecuteActions(AssociatedObject, Actions, null);
+        }
+    }
+}
@@ -0,0 +1,5 @@
+using System;
+
+namespace Toolkit.UI.WinUI;
+
+public class ItemInvokedEventArgs : EventArgs;