namespace Yw.WpfUI.Hydro
{
    /// <summary>
    /// 简单高亮管理器
    /// </summary>
    internal class SimpleHighlightManager
    {
        /// <summary>
        /// 
        /// </summary>
        public SimpleHighlightManager(HelixViewport3D viewport)
        {
            _viewport = viewport;
        }

        /// <summary>
        /// 状态改变事件
        /// </summary>
        public event Action<Visual3D, eHighlightType> StateChangedEvent;


        private readonly HelixViewport3D _viewport;
        private Visual3D _visual;


        /// <summary>
        /// 高亮
        /// </summary>
        public void Highlight(Point pt)
        {
            var visual = _viewport.FindNearestVisual(pt);
            if (visual == null)
            {
                Reset();
                return;
            }
            if (_visual == visual)
            {
                return;
            }
            Reset();
            _visual = visual;
            this.StateChangedEvent?.Invoke(_visual, eHighlightType.Load);
        }

        //重置
        private void Reset()
        {
            if (_visual != null)
            {
                this.StateChangedEvent?.Invoke(_visual, eHighlightType.Unload);
                _visual = null;
            }
        }





    }
}