internal Span GetAvalonTextElementSpan(Int32 bufferPosition)
{
if (!this.ContainsPosition(bufferPosition))
{
throw new ArgumentOutOfRangeException("bufferPosition");
}
if ((bufferPosition < this.LineSpan.Start) || (bufferPosition > this.LineSpan.End))
{
throw new ArgumentOutOfRangeException("bufferPosition");
}
if (bufferPosition > (this.LineSpan.End - this.NewlineLength))
{
return(new Span(this.LineSpan.End, 0));
}
if (bufferPosition == (this.LineSpan.End - this.NewlineLength))
{
return(new Span(this.LineSpan.End - this.NewlineLength, this.NewlineLength));
}
Int32 lineRelativePosition = this.GetLineRelativePosition(bufferPosition);
if (lineRelativePosition < 0)
{
lineRelativePosition = 0;
}
Int32 indexOfLineContaining = this.GetIndexOfLineContaining(lineRelativePosition);
TextLine line = _textLines[indexOfLineContaining];
CharacterHit nextCaretCharacterHit = line.GetNextCaretCharacterHit(new CharacterHit(lineRelativePosition, 0));
Int32 bufferRelativePosition = this.GetBufferRelativePosition(nextCaretCharacterHit.FirstCharacterIndex + nextCaretCharacterHit.TrailingLength);
nextCaretCharacterHit = line.GetPreviousCaretCharacterHit(new CharacterHit(this.GetLineRelativePosition(bufferRelativePosition), 0));
Int32 start = this.GetBufferRelativePosition(nextCaretCharacterHit.FirstCharacterIndex);
return(new Span(start, bufferRelativePosition - start));
}