void RemoveInternal(ref DeferredEventList deferredEventList, int offset, int length)
{
Debug.Assert(length >= 0);
if (length == 0)
{
return;
}
LineSegmentTree.Enumerator it = lineCollection.GetEnumeratorForOffset(offset);
LineSegment startSegment = it.Current;
int startSegmentOffset = startSegment.Offset;
if (offset + length < startSegmentOffset + startSegment.TotalLength)
{
// just removing a part of this line segment
startSegment.RemovedLinePart(ref deferredEventList, offset - startSegmentOffset, length);
SetSegmentLength(startSegment, startSegment.TotalLength - length);
return;
}
// merge startSegment with another line segment because startSegment's delimiter was deleted
// possibly remove lines in between if multiple delimiters were deleted
int charactersRemovedInStartLine = startSegmentOffset + startSegment.TotalLength - offset;
Debug.Assert(charactersRemovedInStartLine > 0);
startSegment.RemovedLinePart(ref deferredEventList, offset - startSegmentOffset, charactersRemovedInStartLine);
LineSegment endSegment = lineCollection.GetByOffset(offset + length);
if (endSegment == startSegment)
{
// special case: we are removing a part of the last line up to the
// end of the document
SetSegmentLength(startSegment, startSegment.TotalLength - length);
return;
}
int endSegmentOffset = endSegment.Offset;
int charactersLeftInEndLine = endSegmentOffset + endSegment.TotalLength - (offset + length);
endSegment.RemovedLinePart(ref deferredEventList, 0, endSegment.TotalLength - charactersLeftInEndLine);
startSegment.MergedWith(endSegment, offset - startSegmentOffset);
SetSegmentLength(startSegment, startSegment.TotalLength - charactersRemovedInStartLine + charactersLeftInEndLine);
startSegment.DelimiterLength = endSegment.DelimiterLength;
// remove all segments between startSegment (excl.) and endSegment (incl.)
it.MoveNext();
LineSegment segmentToRemove;
do
{
segmentToRemove = it.Current;
it.MoveNext();
lineCollection.RemoveSegment(segmentToRemove);
segmentToRemove.Deleted(ref deferredEventList);
} while (segmentToRemove != endSegment);
}
internal void Deleted(ref DeferredEventList deferredEventList)
{
treeEntry = LineSegmentTree.Enumerator.Invalid;
if (anchors != null)
{
foreach (TextAnchor a in anchors)
{
a.Delete(ref deferredEventList);
}
anchors = null;
}
}
internal void RemovedLinePart(ref DeferredEventList deferredEventList, int startColumn, int length)
{
if (length == 0)
{
return;
}
Debug.Assert(length > 0);
if (anchors != null)
{
List <TextAnchor> deletedAnchors = null;
foreach (TextAnchor a in anchors)
{
if (a.ColumnNumber > startColumn)
{
if (a.ColumnNumber >= startColumn + length)
{
a.ColumnNumber -= length;
}
else
{
if (deletedAnchors == null)
{
deletedAnchors = new List <TextAnchor>();
}
a.Delete(ref deferredEventList);
deletedAnchors.Add(a);
}
}
}
if (deletedAnchors != null)
{
foreach (TextAnchor a in deletedAnchors)
{
anchors.Remove(a);
}
}
}
}
public void Replace(int offset, int length, string text)
{
Debug.WriteLine("Replace offset=" + offset + " length=" + length + " text.Length=" + text.Length);
int lineStart = GetLineNumberForOffset(offset);
int oldNumberOfLines = this.TotalNumberOfLines;
DeferredEventList deferredEventList = new DeferredEventList();
RemoveInternal(ref deferredEventList, offset, length);
int numberOfLinesAfterRemoving = this.TotalNumberOfLines;
if (!string.IsNullOrEmpty(text))
{
InsertInternal(offset, text);
}
// #if DEBUG
// Console.WriteLine("New line collection:");
// Console.WriteLine(lineCollection.GetTreeAsString());
// Console.WriteLine("New text:");
// Console.WriteLine("'" + document.TextContent + "'");
// #endif
// Only fire events after RemoveInternal+InsertInternal finished completely:
// Otherwise we would expose inconsistent state to the event handlers.
RunHighlighter(lineStart, 1 + Math.Max(0, this.TotalNumberOfLines - numberOfLinesAfterRemoving));
if (deferredEventList.removedLines != null)
{
foreach (LineSegment ls in deferredEventList.removedLines)
{
OnLineDeleted(new LineEventArgs(document, ls));
}
}
deferredEventList.RaiseEvents();
if (this.TotalNumberOfLines != oldNumberOfLines)
{
OnLineCountChanged(new LineCountChangeEventArgs(document, lineStart, this.TotalNumberOfLines - oldNumberOfLines));
}
}
internal void Delete(ref DeferredEventList deferredEventList)
{
lineSegment = null;
deferredEventList.AddDeletedAnchor(this);
}