How to print entire NSCollectionView - swift

Question

I'm trying to print entire NSCollectionView. It prints only displayed items, moreover it doesn't render NSCollectionViewItem properly
Print is populated by bindings using first responder. Method:
#IBAction func printEquations(_ sender: Any) {
let op = NSPrintOperation(view: collectionView)
op.canSpawnSeparateThread = true
let pi = op.printInfo
pi.horizontalPagination = NSPrintingPaginationMode.fitPagination
pi.verticalPagination = NSPrintingPaginationMode.fitPagination
pi.isHorizontallyCentered = true
pi.isVerticallyCentered = true
pi.isSelectionOnly = false
pi.orientation = NSPaperOrientation.portrait
pi.leftMargin = 10
pi.rightMargin = 10
op.run()
}
NSCollectionView subclass:
class EQCollectionView: NSCollectionView {
var printRect: NSRect?
override func draw(_ dirtyRect: NSRect) {
if (NSGraphicsContext.currentContextDrawingToScreen()) {
self.layer!.borderWidth = 0
self.layer!.borderColor = nil
self.backgroundColors = []
super.draw(dirtyRect)
} else {
self.wantsLayer = true
let printWidth = Double(calculatePrintWidth())
let printHeight = Double(calculatePrintHeight())
printRect = NSRect(x: 0, y: 0, width: printWidth, height: printHeight)
super.draw(printRect!)
}
}
func calculatePrintHeight() -> Float {
let pi = NSPrintOperation.current()!.printInfo
let paperSize = pi.paperSize
let pageHeight = Float(paperSize.height - pi.topMargin - pi.bottomMargin)
let scale = Float(pi.dictionary().object(forKey: NSPrintScalingFactor) as! CGFloat)
return pageHeight / scale
}
func calculatePrintWidth() -> Float {
let pi = NSPrintOperation.current()!.printInfo
let paperSize = pi.paperSize
let pageWidth = Float(paperSize.width - pi.leftMargin - pi.rightMargin)
let scale = Float(pi.dictionary().object(forKey: NSPrintScalingFactor) as! CGFloat)
return pageWidth / scale
}
override func knowsPageRange(_ range: NSRangePointer) -> Bool {
range.pointee.location = 1
range.pointee.length = 1
return true
}
override func rectForPage(_ page: Int) -> NSRect {
let bounds = self.bounds
let pageHeight = calculatePrintHeight()
let rect = NSMakeRect( NSMinX(bounds), NSMinY(bounds), frame.width, CGFloat(pageHeight));
return rect;
}
}
How to print NSCollectionView with all available content?