Avalonia/src/Perspex.SceneGraph/Media/Transform.cs

// Copyright (c) The Perspex Project. All rights reserved.
// Licensed under the MIT license. See licence.md file in the project root for full license information.

using System;
using Perspex.Animation;

namespace Perspex.Media
{
    /// <summary>
    /// Represents a transform on an <see cref="IVisual"/>.
    /// </summary>
    public abstract class Transform : Animatable
    {
        /// <summary>
        /// Raised when the transform changes.
        /// </summary>
        public event EventHandler Changed;

        /// <summary>
        /// Gets the tranform's <see cref="Matrix"/>.
        /// </summary>
        public abstract Matrix Value { get; }

        /// <summary>
        /// Raises the <see cref="Changed"/> event.
        /// </summary>
        protected void RaiseChanged()
        {
            Changed?.Invoke(this, EventArgs.Empty);
        }
    }
}