// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)

using System;
using System.Windows.Input;
using ICSharpCode.AvalonEdit.Document;

namespace ICSharpCode.AvalonEdit.Snippets
{
	/// <summary>
	/// Sets the caret position after interactive mode has finished.
	/// </summary>
	[Serializable]
	public class SnippetCaretElement : SnippetElement
	{
		/// <inheritdoc/>
		public override void Insert(InsertionContext context)
		{
			if (!string.IsNullOrEmpty(context.SelectedText))
				SetCaret(context);
		}
		
		internal static void SetCaret(InsertionContext context)
		{
			TextAnchor pos = context.Document.CreateAnchor(context.InsertionPosition);
			pos.MovementType = AnchorMovementType.BeforeInsertion;
			pos.SurviveDeletion = true;
			context.Deactivated += (sender, e) => {
				if (e.Reason == DeactivateReason.ReturnPressed || e.Reason == DeactivateReason.NoActiveElements) {
					context.TextArea.Caret.Offset = pos.Offset;
				}
			};
		}
	}
}