public RtRange SplitRange(RtRange range)
{
// todo: bug: need +1 on the end?
var firstGlobalIndex = GetGlobalIndex(range.FirstCharPos);
var lastGlobalIndex = GetGlobalIndex(range.LastCharPos);
SplitSpan(GetPositionForCharIndex(firstGlobalIndex, RichTextPositionPreference.NextSpan), out _);
SplitSpan(GetPositionForCharIndex(lastGlobalIndex, RichTextPositionPreference.PreviousSpan), out _);
return(new RtRange(
GetPositionForCharIndex(firstGlobalIndex, RichTextPositionPreference.NextSpan),
GetPositionForCharIndex(lastGlobalIndex, RichTextPositionPreference.PreviousSpan)));
}
public bool TryGetCommonParagraphProperty <T>(RtRange range, Func <IRtParagraph, T> getProp, out T common)
where T : IEquatable <T>
{
var firstPara = Paragraphs[range.FirstCharPos.ParaIndex];
common = getProp(firstPara);
foreach (var para in Paragraphs.Skip(range.FirstCharPos.ParaIndex + 1).Take(range.LastCharPos.ParaIndex - range.FirstCharPos.ParaIndex))
{
var other = getProp(para);
if (!common.Equals(other))
{
return(false);
}
}
return(true);
}
public bool TryGetCommonSpanProperty <T>(RtRange range, Func <IRtSpan, T> getProp, out T common)
where T : IEquatable <T>
{
var spans = EnumerateSpans(range);
var firstSpan = spans.First();
common = getProp(firstSpan);
foreach (var span in spans.Skip(1))
{
var other = getProp(span);
if (!common.Equals(other))
{
return(false);
}
}
return(true);
}
public IEnumerable <IRtSpan> EnumerateSpans(RtRange range)
{
var firstPara = Paragraphs[range.FirstCharPos.ParaIndex];
var firstSpan = firstPara.Spans[range.FirstCharPos.SpanIndex];
var lastPara = Paragraphs[range.LastCharPos.ParaIndex];
var lastSpan = lastPara.Spans[range.LastCharPos.SpanIndex];
if (firstSpan == lastSpan)
{
yield return(firstSpan);
}
else if (firstPara == lastPara)
{
for (int i = range.FirstCharPos.SpanIndex; i <= range.LastCharPos.SpanIndex; i++)
{
yield return(firstPara.Spans[i]);
}
}
else
{
for (int i = range.FirstCharPos.SpanIndex; i < firstPara.Spans.Count; i++)
{
yield return(firstPara.Spans[i]);
}
for (int i = range.FirstCharPos.ParaIndex + 1; i < range.LastCharPos.ParaIndex; i++)
{
foreach (var span in Paragraphs[i].Spans)
{
yield return(span);
}
}
for (int i = 0; i <= range.LastCharPos.SpanIndex; i++)
{
yield return(lastPara.Spans[i]);
}
}
}