Create AttachedToLogicalTreeBehavior.cs

src/Avalonia.Xaml.Interactions.Custom/AttachedToLogicalTreeBehavior.cs

@@ -0,0 +1,31 @@
+using System.Reactive.Disposables;
+using Avalonia.Xaml.Interactivity;
+
+namespace Avalonia.Xaml.Interactions.Custom;
+
+/// <summary>
+/// A base class for behaviors using attached to logical tree event.
+/// </summary>
+/// <typeparam name="T"></typeparam>
+public abstract class AttachedToLogicalTreeBehavior<T> : DisposingBehavior<T> where T : StyledElement
+{
+ private CompositeDisposable? _disposables;
+
+ /// <inheritdoc />
+ protected override void OnAttached(CompositeDisposable disposables)
+ {
+ _disposables = disposables;
+ }
+
+ /// <inheritdoc />
+ protected override void OnAttachedToLogicalTree()
+ {
+ OnAttachedToLogicalTree(_disposables!);
+ }
+
+ /// <summary>
+ /// Called after the <see cref="Behavior{T}.AssociatedObject"/> is attached to the logical tree.
+ /// </summary>
+ /// <param name="disposable">The group of disposable resources that are disposed together</param>
+ protected abstract void OnAttachedToLogicalTree(CompositeDisposable disposable);
+}