/// <summary>
/// Gets the first offset greater or equal to <paramref name="startOffset"/> where a folded folding starts.
/// Returns -1 if there are no foldings after <paramref name="startOffset"/>.
/// </summary>
public int GetNextFoldedFoldingStart(int startOffset)
{
FoldingSection fs = foldings.FindFirstSegmentWithStartAfter(startOffset);
while (fs != null && !fs.IsFolded)
{
fs = foldings.GetNextSegment(fs);
}
return(fs != null ? fs.StartOffset : -1);
}
/// <summary>
/// Gets all foldings that start exactly at <paramref name="startOffset"/>.
/// </summary>
public ReadOnlyCollection <FoldingSection> GetFoldingsAt(int startOffset)
{
List <FoldingSection> result = new List <FoldingSection>();
FoldingSection fs = foldings.FindFirstSegmentWithStartAfter(startOffset);
while (fs != null && fs.StartOffset == startOffset)
{
result.Add(fs);
fs = foldings.GetNextSegment(fs);
}
return(result.AsReadOnly());
}
/// <summary>
/// Creates a folding for the specified text section.
/// </summary>
public FoldingSection CreateFolding(int startOffset, int endOffset)
{
if (startOffset >= endOffset)
{
throw new ArgumentException("startOffset must be less than endOffset");
}
FoldingSection fs = new FoldingSection(this, startOffset, endOffset);
foldings.Add(fs);
textView.Redraw();
return(fs);
}
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,
SnapsToDevicePixels = true,
VisualLine = line,
FoldingSection = fs
};
markers.Add(m);
AddVisualChild(m);
m.IsMouseDirectlyOverChanged += delegate { InvalidateVisual(); };
InvalidateMeasure();
continue;
}
}
}
}
internal void RemoveFolding(FoldingSection fs)
{
document.VerifyAccess();
foldings.Remove(fs);
textView.Redraw();
}