private void PaintFoldMarker(Graphics g, int lineNumber, Rectangle drawingRectangle) { var foldLineColor = textArea.Document.HighlightingStrategy.GetColorFor("FoldLine"); var selectedFoldLine = textArea.Document.HighlightingStrategy.GetColorFor("SelectedFoldLine"); var foldingsWithStart = textArea.Document.FoldingManager.GetFoldingsWithStart(lineNumber); var foldingsBetween = textArea.Document.FoldingManager.GetFoldingsContainsLineNumber(lineNumber); var foldingsWithEnd = textArea.Document.FoldingManager.GetFoldingsWithEnd(lineNumber); var isFoldStart = foldingsWithStart.Count > 0; var isBetween = foldingsBetween.Count > 0; var isFoldEnd = foldingsWithEnd.Count > 0; var isStartSelected = SelectedFoldingFrom(foldingsWithStart); var isBetweenSelected = SelectedFoldingFrom(foldingsBetween); var isEndSelected = SelectedFoldingFrom(foldingsWithEnd); var foldMarkerSize = (int)Math.Round(textArea.TextView.FontHeight * 0.57f); foldMarkerSize -= foldMarkerSize % 2; var foldMarkerYPos = drawingRectangle.Y + (drawingRectangle.Height - foldMarkerSize) / 2; var xPos = drawingRectangle.X + (drawingRectangle.Width - foldMarkerSize) / 2 + foldMarkerSize / 2; if (isFoldStart) { var isVisible = true; var moreLinedOpenFold = false; foreach (var foldMarker in foldingsWithStart) { if (foldMarker.IsFolded) { isVisible = false; } else { moreLinedOpenFold = foldMarker.EndLine > foldMarker.StartLine; } } var isFoldEndFromUpperFold = false; foreach (var foldMarker in foldingsWithEnd) { if (foldMarker.EndLine > foldMarker.StartLine && !foldMarker.IsFolded) { isFoldEndFromUpperFold = true; } } DrawFoldMarker(g, new RectangleF(drawingRectangle.X + (drawingRectangle.Width - foldMarkerSize) / 2, foldMarkerYPos, foldMarkerSize, foldMarkerSize), isVisible, isStartSelected ); // draw line above fold marker if (isBetween || isFoldEndFromUpperFold) { g.DrawLine(BrushRegistry.GetPen(isBetweenSelected ? selectedFoldLine.Color : foldLineColor.Color), xPos, drawingRectangle.Top, xPos, foldMarkerYPos - 1); } // draw line below fold marker if (isBetween || moreLinedOpenFold) { g.DrawLine( BrushRegistry.GetPen(isEndSelected || isStartSelected && isVisible || isBetweenSelected ? selectedFoldLine.Color : foldLineColor.Color), xPos, foldMarkerYPos + foldMarkerSize + 1, xPos, drawingRectangle.Bottom); } } else { if (isFoldEnd) { var midy = drawingRectangle.Top + drawingRectangle.Height / 2; // draw fold end marker g.DrawLine(BrushRegistry.GetPen(isEndSelected ? selectedFoldLine.Color : foldLineColor.Color), xPos, midy, xPos + foldMarkerSize / 2, midy); // draw line above fold end marker // must be drawn after fold marker because it might have a different color than the fold marker g.DrawLine( BrushRegistry.GetPen(isBetweenSelected || isEndSelected ? selectedFoldLine.Color : foldLineColor.Color), xPos, drawingRectangle.Top, xPos, midy); // draw line below fold end marker if (isBetween) { g.DrawLine( BrushRegistry.GetPen(isBetweenSelected ? selectedFoldLine.Color : foldLineColor.Color), xPos, midy + 1, xPos, drawingRectangle.Bottom); } } else if (isBetween) { // just draw the line :) g.DrawLine(BrushRegistry.GetPen(isBetweenSelected ? selectedFoldLine.Color : foldLineColor.Color), xPos, drawingRectangle.Top, xPos, drawingRectangle.Bottom); } } }