private RtPosition ToRelPos(int absPos, out IRtParagraph para, out IRtSpan span)
{
para = text.Paragraphs[0];
span = para.Spans[0];
var toSkip = absPos;
for (var paraIndex = 0; paraIndex < text.Paragraphs.Count; paraIndex++)
{
para = text.Paragraphs[paraIndex];
for (var spanIndex = 0; spanIndex < para.Spans.Count; spanIndex++)
{
span = para.Spans[spanIndex];
if (span.LayoutTextLength > toSkip)
{
return(new RtPosition(paraIndex, spanIndex, toSkip));
}
toSkip -= span.LayoutTextLength;
}
if (toSkip == 0)
{
var lastSpanIndex = para.Spans.Count - 1;
var lastSpan = para.Spans[lastSpanIndex];
return(new RtPosition(paraIndex, lastSpanIndex, lastSpan.LayoutTextLength));
}
toSkip--;
}
throw new ArgumentOutOfRangeException();
}
private void InsertSpanAt(int absPos, IRtSpan span)
{
var relPos = ToRelPos(absPos, out var para, out _);
text.SplitSpan(relPos, out var nextSpanIndex);
para.Spans.Insert(nextSpanIndex, span);
Normalize();
}
public void GetParaAndSpan(RtPosition pos, out IRtParagraph para, out IRtSpan span)
{
para = Paragraphs[pos.ParaIndex];
span = para.Spans[pos.SpanIndex];
}
