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// 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;
namespace ICSharpCode.AvalonEdit.Document
{
/// <summary>
/// Allows for low-level line tracking.
/// </summary>
/// <remarks>
/// The methods on this interface are called by the TextDocument's LineManager immediately after the document
/// has changed, *while* the DocumentLineTree is updating.
/// Thus, the DocumentLineTree may be in an invalid state when these methods are called.
/// This interface should only be used to update per-line data structures like the HeightTree.
/// Line trackers must not cause any events to be raised during an update to prevent other code from seeing
/// the invalid state.
/// Line trackers may be called while the TextDocument has taken a lock.
/// You must be careful not to dead-lock inside ILineTracker callbacks.
/// </remarks>
public interface ILineTracker
{
/// <summary>
/// Is called immediately before a document line is removed.
/// </summary>
void BeforeRemoveLine(DocumentLine line);
// /// <summary>
// /// Is called immediately after a document line is removed.
// /// </summary>
// void AfterRemoveLine(DocumentLine line);
/// <summary>
/// Is called immediately before a document line changes length.
/// This method will be called whenever the line is changed, even when the length stays as it is.
/// The method might be called multiple times for a single line because
/// a replacement is internally handled as removal followed by insertion.
/// </summary>
void SetLineLength(DocumentLine line, int newTotalLength);
/// <summary>
/// Is called immediately after a line was inserted.
/// </summary>
/// <param name="newLine">The new line</param>
/// <param name="insertionPos">The existing line before the new line</param>
void LineInserted(DocumentLine insertionPos, DocumentLine newLine);
/// <summary>
/// Indicates that there were changes to the document that the line tracker was not notified of.
/// The document is in a consistent state (but the line trackers aren't), and line trackers should
/// throw away their data and rebuild the document.
/// </summary>
void RebuildDocument();
}
}
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