void TextViewVisualLinesChanged(object sender, EventArgs e)
{
foreach (FoldingMarginMarker m in markers)
{
RemoveVisualChild(m);
}
markers.Clear();
InvalidateVisual();
if (TextView != null && FoldingManager != null && TextView.VisualLinesValid)
{
foreach (VisualLine line in TextView.VisualLines)
{
FoldingSection fs = FoldingManager.GetNextFolding(line.FirstDocumentLine.Offset);
if (fs == null)
{
continue;
}
if (fs.StartOffset <= line.LastDocumentLine.Offset + line.LastDocumentLine.Length)
{
FoldingMarginMarker m = new FoldingMarginMarker {
IsExpanded = !fs.IsFolded,
VisualLine = line,
FoldingSection = fs
};
markers.Add(m);
AddVisualChild(m);
m.IsMouseDirectlyOverChanged += delegate { InvalidateVisual(); };
InvalidateMeasure();
continue;
}
}
}
}