UI

2024-05-04 22:35:12 +01:00
parent fe07d9e994
commit 53efbb13c5
7 changed files with 146 additions and 6 deletions
@@ -0,0 +1,86 @@
+using Avalonia;
+using Avalonia.VisualTree;
+using Avalonia.Xaml.Interactivity;
+using FluentAvalonia.Core;
+using System.Collections;
+using Toolkit.UI.Controls.Avalonia;
+using ISelectable = Toolkit.Foundation.ISelectable;
+
+namespace Toolkit.UI.Avalonia;
+
+public class NavigationViewItemInvokedBehaviour : Trigger
+{
+    public static readonly StyledProperty<bool> SelectsChildOnInvokedProperty =
+        AvaloniaProperty.Register<NavigationViewItemInvokedBehaviour, bool>(nameof(SelectsChildOnInvoked));
+
+    private NavigationView? navigationView;
+
+    public event TypedEventHandler<NavigationViewItem, EventArgs>? Invoked;
+
+    public bool SelectsChildOnInvoked
+    {
+        get => GetValue(SelectsChildOnInvokedProperty);
+        set => SetValue(SelectsChildOnInvokedProperty, value);
+    }
+
+    protected override void OnAttached()
+    {
+        if (AssociatedObject is NavigationViewItem navigationViewItem)
+        {
+            navigationViewItem.AttachedToVisualTree += OnAttachedToVisualTree;
+        }
+
+        base.OnAttached();
+    }
+
+    protected override void OnDetachedFromVisualTree()
+    {
+        if (navigationView is not null)
+        {
+            navigationView.ItemInvoked -= OnItemInvoked;
+        }
+
+        base.OnDetachedFromVisualTree();
+    }
+
+    private void OnAttachedToVisualTree(object? sender,
+        VisualTreeAttachmentEventArgs args)
+    {
+        if (AssociatedObject is NavigationViewItem navigationViewItem)
+        {
+            navigationViewItem.AttachedToVisualTree -= OnAttachedToVisualTree;
+            SetupNavigationView();
+        }
+    }
+
+    private void OnItemInvoked(object? sender,
+        FluentAvalonia.UI.Controls.NavigationViewItemInvokedEventArgs args)
+    {
+        if (AssociatedObject is NavigationViewItem navigationViewItem)
+        {
+            if (args.InvokedItemContainer == AssociatedObject)
+            {
+                Interaction.ExecuteActions(AssociatedObject, Actions, null);
+                if (!navigationViewItem.IsChildSelected && navigationViewItem.MenuItemsSource is IList collection)
+                {
+                    if (collection is { Count: > 0 } && collection[0] is ISelectable selectable)
+                    {
+                        selectable.Selected = true;
+                    }
+                }
+            }
+        }
+    }
+
+    private void SetupNavigationView()
+    {
+        if (AssociatedObject is NavigationViewItem navigationViewItem)
+        {
+            if (navigationViewItem.GetVisualAncestors().OfType<NavigationView>().FirstOrDefault() is NavigationView navigationView)
+            {
+                this.navigationView = navigationView;
+                navigationView.ItemInvoked += OnItemInvoked;
+            }
+        }
+    }
+}