// Просматривает всю коллекцию цветосегментов, и удалаяет все сегменты в интервале [start, end)
public void EraseColorSegment(int start, int end)
{
for (int i = ColorSegments.Count - 1; i >= 0; i--)
{
ColorSegment segment = ColorSegments[i];
if ((start < segment.Start.Offset && end < segment.Start.Offset) ||
(start > segment.End.Offset && end > segment.End.Offset))
{
continue;
}
if (start <= segment.Start.Offset && end >= segment.End.Offset)
{
ColorSegments.RemoveAt(i);
}
else if (start <= segment.Start.Offset && end < segment.End.Offset)
{
TextAnchor startAnchor = Document.CreateAnchor(end);
segment.Start = startAnchor;
}
else if (segment.Start.Offset < start && segment.End.Offset <= end)
{
TextAnchor endAnchor = Document.CreateAnchor(start);
segment.End = endAnchor;
}
else if (segment.Start.Offset < start && end < segment.End.Offset)
{
// разбиваем на 2
// add new
AddColorSegment(end, segment.End.Offset, segment.Color);
TextAnchor endAnchor = Document.CreateAnchor(start);
segment.End = endAnchor;
}
else
{
Debug.Assert(false, "WE CAN'T BE HERE!!!!!");
}
}
IsChanged = true;
}
public void AddColorSegment(int start, int end, SolidColorBrush color)
{
TextAnchor startAnchor = Document.CreateAnchor(start);
startAnchor.MovementType = AnchorMovementType.AfterInsertion;
startAnchor.SurviveDeletion = true;
TextAnchor endAnchor = Document.CreateAnchor(end);
endAnchor.MovementType = AnchorMovementType.BeforeInsertion;
endAnchor.SurviveDeletion = true;
ColorSegment segment = new ColorSegment()
{
Color = color, Start = startAnchor, End = endAnchor
};
ColorSegments.Add(segment);
IsChanged = true;
}
