private IEnumerable <Line> GetUpdatedIndentGuides(IEnumerable <IBlock> blocks, double horizontalOffset, double spaceWidth)
{
ThreadHelper.ThrowIfNotOnUIThread();
foreach (var block in blocks)
{
var pointStart = new SnapshotPoint(_textView.TextSnapshot, block.Area.Start);
var pointEnd = new SnapshotPoint(_textView.TextSnapshot, block.Area.End);
var viewLineStart = _textView.GetTextViewLineContainingBufferPosition(pointStart);
var viewLineEnd = _textView.GetTextViewLineContainingBufferPosition(pointEnd);
if (viewLineStart.Equals(viewLineEnd))
{
continue;
}
var lineStart = pointStart.GetContainingLine();
var spaceText = new SnapshotSpan(lineStart.Start, pointStart).GetText();
var tabs = spaceText.Count(ch => ch == '\t');
var indentStart = (spaceText.Length - tabs) + tabs * _tabSize;
var leftOffset = indentStart * spaceWidth + horizontalOffset + _offsetX;
yield return(new Line()
{
Stroke = Brushes.DarkGray,
StrokeThickness = _thickness,
StrokeDashArray = new DoubleCollection()
{
_dashSize, _spaceSize
},
X1 = leftOffset,
X2 = leftOffset,
Y1 = (viewLineStart.Top != 0) ? viewLineStart.Bottom + _offsetY : _textView.ViewportTop,
Y2 = (viewLineEnd.Top != 0) ? viewLineEnd.Top - _offsetY : _textView.ViewportBottom,
});
}
}
private int GetCaretCellPosition(ITextSnapshotLine line, SnapshotPoint caretBufferPosition)
{
var linePrefixText = new SnapshotSpan(line.Start, caretBufferPosition).GetText();
return(linePrefixText.Count(c => c == '|'));
}
