Shaker/Avalonia/Avalonia.Xaml.Interactivity/Trigger.cs

using Avalonia.Metadata;

namespace Avalonia.Xaml.Interactivity;

/// <summary>
/// A base class for behaviors, implementing the basic plumbing of <seealso cref="ITrigger"/>.
/// </summary>
public abstract class Trigger : Behavior, ITrigger
{
    /// <summary>
    /// Identifies the <seealso cref="Actions"/> avalonia property.
    /// </summary>
    public static readonly DirectProperty<Trigger, ActionCollection> ActionsProperty =
        AvaloniaProperty.RegisterDirect<Trigger, ActionCollection>(nameof(Actions), t => t.Actions);

    private ActionCollection? _actions;

    /// <summary>
    /// Gets the collection of actions associated with the behavior. This is a avalonia property.
    /// </summary>
    [Content]
    public ActionCollection Actions => _actions ??= [];
}