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);
}
}
}