public void SplitSpan(RtPosition pos, out int nextSpanIndex)
{
GetParaAndSpan(pos, out var para, out var span);
if (pos.CharIndex == 0)
{
nextSpanIndex = pos.SpanIndex;
return;
}
if (pos.CharIndex == span.LayoutTextLength)
{
nextSpanIndex = pos.SpanIndex + 1;
return;
}
if (!(span is IRtPureSpan pureSpan))
{
throw new InvalidOperationException("Cannot split non-pure spans in the middle");
}
var secondSpan = AmFactory.Create <RtPureSpan>();
secondSpan.Style = span.Style.CloneTyped();
secondSpan.Text = pureSpan.Text.Substring(pos.CharIndex);
pureSpan.Text = pureSpan.Text.Substring(0, pos.CharIndex);
para.Spans.Insert(pos.SpanIndex + 1, secondSpan);
nextSpanIndex = pos.SpanIndex + 1;
}
public int GetGlobalIndex(RtPosition pos)
{
int globalSpanOffset = 0;
foreach (var para in Paragraphs.Take(pos.ParaIndex))
{
foreach (var span in para.Spans)
{
globalSpanOffset += span.LayoutTextLength;
}
globalSpanOffset++;
}
var exactPara = Paragraphs[pos.ParaIndex];
foreach (var span in exactPara.Spans.Take(pos.SpanIndex))
{
globalSpanOffset += span.LayoutTextLength;
}
globalSpanOffset += pos.CharIndex;
return(globalSpanOffset);
}
public void GetParaAndSpan(RtPosition pos, out IRtParagraph para, out IRtSpan span)
{
para = Paragraphs[pos.ParaIndex];
span = para.Spans[pos.SpanIndex];
}
public IRtSpan GetSpan(RtPosition pos) => Paragraphs[pos.ParaIndex].Spans[pos.SpanIndex];
public IRtParagraph GetPara(RtPosition pos) => Paragraphs[pos.ParaIndex];