using System.Windows.Forms;

namespace Vanara.Windows.Shell
{
	public partial class ThumbnailToolbarButton
	{
		internal class ImageIndexer
		{
			private int index = -1;
			private string key = string.Empty;
			private bool useIntegerIndex = true;

			public virtual int ActualIndex => useIntegerIndex ? Index : (ImageList is null ? -1 : ImageList.Images.IndexOfKey(Key));

			public virtual ImageList ImageList { get; set; }

			public virtual int Index
			{
				get => index;
				set
				{
					key = string.Empty;
					index = value;
					useIntegerIndex = true;
				}
			}

			public virtual string Key
			{
				get => key;
				set
				{
					index = -1;
					key = value ?? string.Empty;
					useIntegerIndex = false;
				}
			}
		}
	}
}