PDF_Office/PDF Office/PDF Master/Class/PDFTools/Snapshot/View/KMSnapshotPDFView.swift

//
//  KMSnapshotPDFView.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2023/12/12.
//

import Cocoa

class KMSnapshotPDFView: CPDFListView {
    
    private var _scalePopUpButton: NSPopUpButton?
    var scalePopUpButton: NSPopUpButton? {
        get {
            if (self._scalePopUpButton == nil) {
                
                let scrollView = self.documentView()
                scrollView?.hasHorizontalScroller = true
                
                // create it
                let scalePopUpButton_ = NSPopUpButton(frame: NSMakeRect(0.0, 0.0, 1.0, 1.0), pullsDown: false)
                scalePopUpButton_.cell?.controlSize = .small
                self._scalePopUpButton = scalePopUpButton_
                
                scalePopUpButton_.isBordered = false
                scalePopUpButton_.isEnabled = true
                scalePopUpButton_.refusesFirstResponder = true
                (scalePopUpButton_.cell as? NSPopUpButtonCell)?.usesItemFromMenu = true
                
                // set a suitable font, the control size is 0, 1 or 2
                scalePopUpButton_.font = .toolTipsFont(ofSize: CONTROL_FONT_SIZE)
                
                var cnt = 0
                var numberOfDefaultItems = self._SKDefaultScaleMenuFactorsCount
                var curItem: AnyObject?
                var label = ""
                var width: CGFloat = 0.0
                var maxWidth: CGFloat = 0.0
                
                let size = NSMakeSize(1000.0, 1000.0)
                let attrs = [NSAttributedString.Key.font : scalePopUpButton_.font ?? .systemFont(ofSize: 13)]
                var maxIndex = 0
                
                // fill it
                for i in 0 ..< numberOfDefaultItems {
                    label = Bundle.main.localizedString(forKey: self._SKDefaultScaleMenuLabels[i], value: "", table: "ZoomValues")
                    width = NSWidth(label.boundingRect(with: size, options: NSString.DrawingOptions(rawValue: 0), attributes: attrs))
                    if (width > maxWidth) {
                        maxWidth = width
                        maxIndex = i
                    }
                    scalePopUpButton_.addItem(withTitle: label)
                    curItem = scalePopUpButton_.item(at: i)
//                    [curItem setRepresentedObject:(SKDefaultScaleMenuFactors[cnt] > 0.0 ? [NSNumber numberWithDouble:SKDefaultScaleMenuFactors[cnt]] : nil)];
                    let fac = self._SKDefaultScaleMenuFactors[i]
                    if fac > 0.0 {
                        (curItem as? NSMenuItem)?.representedObject = NSNumber(value: fac)
                    } else {
                        (curItem as? NSMenuItem)?.representedObject = nil
                    }
                }
                
                // Make sure the popup is big enough to fit the largest cell
                scalePopUpButton_.selectItem(at: maxIndex)
                scalePopUpButton_.sizeToFit()
                scalePopUpButton_.setFrameSize(NSMakeSize(NSWidth(scalePopUpButton_.frame) - CONTROL_WIDTH_OFFSET, CONTROL_HEIGHT))
//
//                // select the appropriate item, adjusting the scaleFactor if necessary
                if self.autoFits {
                    self._setScaleFactor(0, adjustPopup: true)
                } else {
                    self._setScaleFactor(self.scaleFactor, adjustPopup: true)
                }
//
//                // hook it up
                scalePopUpButton_.target = self
                scalePopUpButton_.action = #selector(_scalePopUpAction)
//
//                // don't let it become first responder
                scalePopUpButton_.refusesFirstResponder = true
                
            }
            
            return _scalePopUpButton
        }
    }
    
    var autoFitPage: CPDFPage?
    var autoFitRect: NSRect = .zero
    var autoFits = false
    var startScale: CGFloat = 0
    var minHistoryIndex = 0
    
    private let CONTROL_FONT_SIZE = 10.0
    private let CONTROL_HEIGHT = 15.0
    private let CONTROL_WIDTH_OFFSET = 20.0
    
    private let _SKDefaultScaleMenuLabels = ["Auto", "10%", "20%", "25%", "35%", "50%", "60%", "71%", "85%", "100%", "120%", "141%", "170%", "200%", "300%", "400%", "600%", "800%", "1000%", "1200%", "1400%", "1700%", "2000%"]
    private let _SKDefaultScaleMenuFactors = [0.0, 0.1, 0.2, 0.25, 0.35, 0.5, 0.6, 0.71, 0.85, 1.0, 1.2, 1.41, 1.7, 2.0, 3.0, 4.0, 6.0, 8.0, 10.0, 12.0, 14.0, 17.0, 20.0]
    private let _SKMinDefaultScaleMenuFactor = 0.1
    private let _SKDefaultScaleMenuFactorsCount = 23
    
    private let SKPDFContentViewChangedNotification = "SKPDFContentViewChangedNotification"
    
    deinit {
        KMPrint("KMSnapshotPDFView deinit.")
        
        NotificationCenter.default.removeObserver(self)
    }
    
    override init(frame frameRect: NSRect) {
        super.init(frame: frameRect)
        
        self._commonInitialization()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
        self._commonInitialization()
    }
    
    override func layout() {
        super.layout()
        
        let scrollView = self.documentView()
        let clipView = scrollView?.contentView
//        KMPrint(scrollView?.frame)
//        KMPrint(clipView?.frame)
        scrollView?.frame = self.bounds
        
    }
    
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        // Drawing code here.
    }
    
    @objc func handlePDFViewFrameChangedNotification(_ notification: NSNotification) {
        if self.autoFits {
            let clipView = self.documentView().contentView
            let clipRect = self.convert(clipView.visibleRect, from: clipView)
            var rect = self.convert(self.autoFitRect, from: self.autoFitPage)
            
            let factor = fmin(NSWidth(clipRect) / NSWidth(rect), NSHeight(clipRect) / NSHeight(rect))
            rect = self.convert(NSInsetRect(rect, 0.5 * (NSWidth(rect) - NSWidth(clipRect) / factor), 0.5 * (NSHeight(rect) - NSHeight(clipRect) / factor)), to: self.autoFitPage)
            super.scaleFactor = factor * self.scaleFactor
            self.go(to: rect, on: self.autoFitPage)
        }
    }
    
    @objc func handlePDFContentViewFrameChangedDelayedNotification(_ notification: NSNotification) {
        if self.inLiveResize == false && (self.window?.isZoomed ?? false) == false {
            self._resetAutoFitRectIfNeeded()
        }
    }
    
    @objc func handlePDFContentViewFrameChangedNotification(_ notification: NSNotification) {
        if self.inLiveResize == false && (self.window?.isZoomed ?? false) == false {
            let note = Notification(name: Notification.Name(SKPDFContentViewChangedNotification), object: self)
            NotificationQueue.default.enqueue(note, postingStyle: .whenIdle, coalesceMask: .onName, forModes: nil)
        }
    }
    
    @objc func handlePDFViewScaleChangedNotification(_ notification: NSNotification) {
        if self.autoFits == false {
            self._setScaleFactor(fmax(self.scaleFactor, _SKMinDefaultScaleMenuFactor), adjustPopup: true)
        }
    }
    
    func setAutoScales() {
        
    }
    
    @IBAction override func zoomIn(_ sender: Any?) {
        if self.autoFits {
            super.zoomIn(sender)
            self._setAutoFits(false, adjustPopup: true)
        } else {
            let numberOfDefaultItems = _SKDefaultScaleMenuFactorsCount
            var i = self._lowerIndex(for: self.scaleFactor)
            if i < numberOfDefaultItems-1 {
               i += 1
            }
            self._setScaleFactor(_SKDefaultScaleMenuFactors[Int(i)])
        }
    }
    
    @IBAction override func zoomOut(_ sender: Any?) {
        if self.autoFits {
            super.zoomOut(sender)
            self._setAutoFits(false, adjustPopup: true)
        } else {
            var i = self._upperIndex(for: self.scaleFactor)
            if i > 1 {
                i -= 1
            }
            self._setScaleFactor(_SKDefaultScaleMenuFactors[Int(i)])
        }
    }
    
    override var canZoomIn: Bool {
        if super.canZoomIn == false {
            return false
        }
        let numberOfDefaultItems = _SKDefaultScaleMenuFactorsCount
        let i = self._lowerIndex(for: self.scaleFactor)
        return i < numberOfDefaultItems - 1
    }
    
    override var canZoomOut: Bool {
        if super.canZoomOut == false {
            return false
        }
        let i = self._upperIndex(for: self.scaleFactor)
        return i > 1
    }
    
    override func go(to page: CPDFPage!) {
        super.go(to: page)
        
        self._resetAutoFitRectIfNeeded()
    }
    
    @objc func doAutoFit(_ sender: Any?) {
        self.autoFits = true
    }
    
    @objc func doActualSize(_ sender: Any?) {
        self.scaleFactor = 1.0
    }
    
    override func menu(for event: NSEvent) -> NSMenu? {
        let selectionActions: NSSet = NSSet(objects: ["copy:", "_searchInSpotlight:", "_searchInGoogle:", "_searchInDictionary:", "_revealSelection:"])
        var menu = super.menu(for: event)
        if menu == nil {
            menu = NSMenu()
        }
        
        menu?.insertItem(.separator(), at: 0)
        menu?.insertItem(withTitle: KMLocalizedString("Print"), action: #selector(menuItemClick_Print), target: self, at: 0)

        var item = menu?.insertItem(withTitle: KMLocalizedString("Export"), action: nil, target: self, at: 0)
        let subMenu = NSMenu()
         
        subMenu.addItem(title: KMLocalizedString("PNG"), action: #selector(menuItemClick_ExportPNG), target: self)
        subMenu.addItem(title: KMLocalizedString("JPG"), action: #selector(menuItemClick_ExportJPG), target: self)
        subMenu.addItem(title: KMLocalizedString("PDF"), action: #selector(menuItemClick_ExportPDF), target: self)
        item?.submenu = subMenu

        menu?.insertItem(.separator(), at: 0)
        menu?.insertItem(withTitle: KMLocalizedString("Copy"), action: #selector(menuItemClick_Copy), target: self, at: 0)
        
//        [self setCurrentSelection:RUNNING_AFTER(10_11) ? [[[PDFSelection alloc] initWithDocument:[self document]] autorelease] : nil];
        self.currentSelection = CPDFSelection(document: self.document)
        if let _menu = menu {
            while (_menu.numberOfItems > 0) {
                if let item = _menu.item(at: 0), item.action != nil {
                    if item.isSeparatorItem || self.validate(item) == false || selectionActions.contains(NSStringFromSelector(item.action!)) {
                        menu?.removeItem(at: 0)
                    } else {
                        break
                    }
                } else {
                    break
                }
            }
        }
        
        if let i = menu?.indexOfItem(withTarget: self, andAction: NSSelectorFromString("_setAutoSize:")), i != -1 {
            menu?.item(at: i)?.action = #selector(doAutoFit)
        }
        if let i = menu?.indexOfItem(withTarget: self, andAction: NSSelectorFromString("_setActualSize:")), i != -1 {
            menu?.item(at: i)?.action = #selector(doActualSize)
            var item = menu?.insertItem(withTitle: KMLocalizedString("Physical Size"), action: #selector(doPhysicalSize), target: self, at: i + 1)
//            item?.keyEquivalentModifierMask = [.alternate]
//            [item setKeyEquivalentModifierMask:NSAlternateKeyMask];
//            [item setAlternate:YES];
            item?.isAlternate = true
        }
        
        return menu
    }
    
    @objc func doPhysicalSize(_ sender: Any?) {
//        [self setPhysicalScaleFactor:1.0];
    }
    
    override func magnify(with event: NSEvent) {
        if KMDataManager.ud_bool(forKey: SKDisablePinchZoomKey) == false && event.responds(to: NSSelectorFromString("magnification")) {
            if event.phase == .began {
                self.startScale = self.scaleFactor
            }
            let magnifyFactor = (1.0 + fmax(-0.5, fmin(1.0 , event.magnification)))
            super.scaleFactor = magnification * self.scaleFactor
            if event.phase == .ended || event.phase == .cancelled && (fabs(self.startScale-self.scaleFactor) > 0.001) {
                self._setScaleFactor(fmax(self.scaleFactor, _SKMinDefaultScaleMenuFactor), adjustPopup: true)
            }
        }
    }
    
    /*

     - (BOOL)canGoBack {
         if ([self respondsToSelector:@selector(currentHistoryIndex)] && minHistoryIndex > 0)
             return minHistoryIndex < [self currentHistoryIndex];
         else
             return [super canGoBack];
     }

     // we don't want to steal the printDocument: action from the responder chain
     - (void)printDocument:(id)sender{}

     - (BOOL)respondsToSelector:(SEL)aSelector {
         return aSelector != @selector(printDocument:) && [super respondsToSelector:aSelector];
     }

     #pragma mark Gestures

     - (void)beginGestureWithEvent:(NSEvent *)theEvent {
         if ([[SKSnapshotPDFView superclass] instancesRespondToSelector:_cmd])
             [super beginGestureWithEvent:theEvent];
         startScale = [self scaleFactor];
     }

     - (void)endGestureWithEvent:(NSEvent *)theEvent {
         if (fabs(startScale - [self scaleFactor]) > 0.001)
             [self setScaleFactor:fmax([self scaleFactor], SKMinDefaultScaleMenuFactor) adjustPopup:YES];
         if ([[SKSnapshotPDFView superclass] instancesRespondToSelector:_cmd])
             [super endGestureWithEvent:theEvent];
     }

     - (void)magnifyWithEvent:(NSEvent *)theEvent {

     }

     #pragma mark Dragging

     - (void)mouseDown:(NSEvent *)theEvent{
         [[self window] makeFirstResponder:self];
         
         if ([theEvent standardModifierFlags] == (NSCommandKeyMask | NSShiftKeyMask)) {
             
             [self doPdfsyncWithEvent:theEvent];
             
         } else {
             
             [self doDragWithEvent:theEvent];
             
         }
     }

     - (void)setCursorForAreaOfInterest:(PDFAreaOfInterest)area {
         if ([NSEvent standardModifierFlags] == (NSCommandKeyMask | NSShiftKeyMask))
             [[NSCursor arrowCursor] set];
         else
             [[NSCursor openHandCursor] set];
     }
     */
    
    func thumbnailWithSize(_ size: CGFloat) -> NSImage? {
//        NSView *clipView = [[[self documentView] enclosingScrollView] contentView];
        let clipView = self.documentView().contentView
        var bounds = self.convert(clipView.bounds, from: clipView)
        guard let imageRep = self.bitmapImageRepForCachingDisplay(in: bounds) else {
            return nil
        }
        var transform: NSAffineTransform?
        var thumbnailSize = bounds.size
        var shadowBlurRadius = 0.0
        var shadowOffset = 0.0
        var image: NSImage?
        
        self.cacheDisplay(in: bounds, to: imageRep)
        
        bounds.origin = .zero
        
        if (size > 0.0) {
            shadowBlurRadius = round(size / 32.0)
            shadowOffset = -ceil(shadowBlurRadius * 0.75)
            if (NSHeight(bounds) > NSWidth(bounds)) {
                thumbnailSize = NSMakeSize(round((size - 2.0 * shadowBlurRadius) * NSWidth(bounds) / NSHeight(bounds) + 2.0 * shadowBlurRadius), size)
            } else {
                thumbnailSize = NSMakeSize(size, round((size - 2.0 * shadowBlurRadius) * NSHeight(bounds) / NSWidth(bounds) + 2.0 * shadowBlurRadius))
            }
            transform = NSAffineTransform()
            transform?.translateX(by: shadowBlurRadius, yBy: shadowBlurRadius - shadowOffset)
            transform?.scaleX(by: (thumbnailSize.width - 2.0 * shadowBlurRadius) / NSWidth(bounds), yBy: (thumbnailSize.height - 2.0 * shadowBlurRadius) / NSHeight(bounds))
        }
        
        image = NSImage(size: thumbnailSize)
        
        image?.lockFocus()
        NSGraphicsContext.current?.imageInterpolation = .high
        transform?.concat()
        NSGraphicsContext.saveGraphicsState()
//        [[PDFView defaultPageBackgroundColor] set];
//        if (shadowBlurRadius > 0.0) {
//            [NSShadow setShadowWithColor:[NSColor colorWithCalibratedWhite:0.0 alpha:0.5] blurRadius:shadowBlurRadius yOffset:shadowOffset];
//        }
        __NSRectFill(bounds)
        NSGraphicsContext.current?.imageInterpolation = .default
        NSGraphicsContext.restoreGraphicsState()
        imageRep.draw(in: bounds)
        image?.unlockFocus()
        
        return image
    }
    
    func resetHistory() {
//        if ([self respondsToSelector:@selector(currentHistoryIndex)])
//            minHistoryIndex = [self currentHistoryIndex];
        if self.responds(to: NSSelectorFromString("currentHistoryIndex")) {
//            self.current
        }
    }
    
    // MARK: - Menu
    @objc func menuItemClick_Print(_ sender: AnyObject?) {
//        NSImage * image = [self thumbnailWithSize:0.0];
//
//        PDFPage *page = [[[PDFPage alloc] initWithImage:image] autorelease];
//
//        PDFDocument *pdfDocument = [[[PDFDocument alloc] init] autorelease];
//        [pdfDocument insertPage:page atIndex:0];
//
//        NSPrintInfo *printInfo = [NSPrintInfo sharedPrintInfo];
//
//        NSPrintOperation *printOperation = nil;
//        if ([pdfDocument respondsToSelector:@selector(printOperationForPrintInfo:scalingMode:autoRotate:)]){
//            printOperation = [pdfDocument printOperationForPrintInfo:printInfo scalingMode:kPDFPrintPageScaleNone autoRotate:YES];
//        }
//
//        [printOperation runOperationModalForWindow:self.window delegate:self didRunSelector:nil contextInfo:NULL];
    }
    
    @objc func menuItemClick_ExportPDF(_ sender: NSMenuItem) {
        guard let image = self.thumbnailWithSize(0) else {
            return
        }

        let document = CPDFDocument()
        document?.km_insert(image: image, at: 0)
        
        NSPanel.savePanel_pdf_success(self.window!, document: document) { url in
            NSWorkspace.shared.selectFile(url.path, inFileViewerRootedAtPath: "")
        }
    }
     
    @objc func menuItemClick_ExportJPG(_ sender: NSMenuItem) {
        guard let image = self.thumbnailWithSize(0) else {
            return
        }
        
        NSPanel.savePanel_data_success(self.window!, imageData: image.jpgData(), allowedTypes: ["jpg"]) { url in
            NSWorkspace.shared.selectFile(url.path, inFileViewerRootedAtPath: "")
        }
    }
    
    @objc func menuItemClick_Copy(_ sender: AnyObject?) {
        guard let image = self.thumbnailWithSize(0) else {
            return
        }
        if let tiffData = image.tiffRepresentation {
            let pasteboardItem = NSPasteboardItem()
            pasteboardItem.setData(tiffData, forType: .tiff)
            let pboard = NSPasteboard.general
            pboard.clearContents()
            pboard.writeObjects([pasteboardItem])
        }
    }

    @objc func menuItemClick_ExportPNG(_ sender: NSMenuItem) {
        guard let image = self.thumbnailWithSize(0) else {
            return
        }
        
        NSPanel.savePanel_data_success(self.window!, imageData: image.pngData(), allowedTypes: ["png"]) { url in
            NSWorkspace.shared.selectFile(url.path, inFileViewerRootedAtPath: "")
        }
    }
    
}

// MARK: - Private Methods

extension KMSnapshotPDFView {
    private func _commonInitialization() {
        self._scalePopUpButton = nil
        self.autoFitPage = nil
        self.autoFitRect = .zero
        
        NotificationCenter.default.addObserver(self, selector: #selector(handlePDFViewFrameChangedNotification), name: NSView.frameDidChangeNotification, object: self)
        NotificationCenter.default.addObserver(self, selector: #selector(handlePDFViewFrameChangedNotification), name: NSView.boundsDidChangeNotification, object: self)
        NotificationCenter.default.addObserver(self, selector: #selector(handlePDFContentViewFrameChangedNotification), name: NSView.boundsDidChangeNotification, object: self.documentView()?.contentView)
        NotificationCenter.default.addObserver(self, selector: #selector(handlePDFContentViewFrameChangedDelayedNotification), name: NSNotification.Name(SKPDFContentViewChangedNotification), object: self)
//        if ([PDFView instancesRespondToSelector:@selector(magnifyWithEvent:)] == NO || [PDFView instanceMethodForSelector:@selector(magnifyWithEvent:)] == [NSView instanceMethodForSelector:@selector(magnifyWithEvent:)])
//            [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handlePDFViewScaleChangedNotification:)
//                                                         name:PDFViewScaleChangedNotification object:self];
    }
    
    private func _setScaleFactor(_ newScaleFactor: CGFloat) {
        self._setScaleFactor(newScaleFactor, adjustPopup: true)
    }
    
    private func _setScaleFactor(_ newScaleFactor: CGFloat, adjustPopup flag: Bool) {
        var newValue = newScaleFactor
        if flag {
            let i = self._index(for: newScaleFactor)
            self.scalePopUpButton?.selectItem(at: Int(i))
            newValue = self._SKDefaultScaleMenuFactors[Int(i)]
        }
        if self.autoFits {
            self._setAutoFits(false, adjustPopup: false)
        }
        super.scaleFactor = newValue
    }
    
    private func _lowerIndex(for scaleFactor: CGFloat) -> UInt {
        var count = self._SKDefaultScaleMenuFactorsCount
        for i in 0 ..< count {
            let index = count-i-1
            if (scaleFactor * 1.01 > self._SKDefaultScaleMenuFactors[index]) {
                return UInt(index)
            }
        }
        return 1
    }
    
    private func _upperIndex(for scaleFactor: CGFloat) -> UInt {
        var count = self._SKDefaultScaleMenuFactorsCount
        for i in 1 ..< count {
            if (scaleFactor * 0.99 < self._SKDefaultScaleMenuFactors[i]) {
                return UInt(i)
            }
        }
        return UInt(count - 1)
    }
    
    private func _index(for scaleFactor: CGFloat) -> UInt {
        let lower = self._lowerIndex(for: scaleFactor)
        let upper = self._upperIndex(for: scaleFactor)
        if (upper > lower && scaleFactor < 0.5 * (self._SKDefaultScaleMenuFactors[Int(lower)] + self._SKDefaultScaleMenuFactors[Int(upper)])) {
            return lower
        }
        return upper
    }
    
    private func _setAutoFits(_ newAuto: Bool) {
        self._setAutoFits(newAuto, adjustPopup: true)
    }
    
    private func _setAutoFits(_ newAuto: Bool, adjustPopup flag: Bool) {
        if (self.autoFits != newAuto) {
            self.autoFits = newAuto;
            if (self.autoFits) {
                super.autoScales = false
                self._resetAutoFitRectIfNeeded()
                if (flag) {
                    self.scalePopUpButton?.selectItem(at: 0)
                }
            } else {
                self.autoFitPage = nil
                self.autoFitRect = NSZeroRect
                if (flag) {
                    self._setScaleFactor(self.scaleFactor, adjustPopup: flag)
                }
            }
        }
    }
    
    private func _resetAutoFitRectIfNeeded() {
        if self.autoFits {
            if let clipView = self.documentView()?.contentView {
                self.autoFitPage = self.currentPage()
                let rect = self.convert(clipView.visibleRect, from: clipView)
                self.autoFitRect = self.convert(rect, to: self.autoFitPage)
            }
        }
    }
    
    @objc private func _scalePopUpAction(_ sender: AnyObject?) {
//        NSNumber *selectedFactorObject = [[sender selectedItem] representedObject];
        let selectedFactorObject = self.scalePopUpButton?.selectedItem?.representedObject
        if let data = selectedFactorObject as? NSNumber {
            self._setScaleFactor(data.doubleValue, adjustPopup: false)
        } else {
            self._setAutoFits(true, adjustPopup: false)
        }
    }
}

extension KMSnapshotPDFView {
    override func validate(_ menuItem: NSMenuItem) -> Bool {
        if (menuItem.action == #selector(doAutoFit)) {
            menuItem.state = self.autoFits ? .on : .off
            return true
        } else if (menuItem.action == #selector(doActualSize)) {
            menuItem.state = fabs(self.scaleFactor - 1.0) < 0.1 ? .on : .off
            return true
        }
//        else if (menuItem.action == #selector(doPhysicalSize)) {
//            [menuItem setState:([self autoScales] || fabs([self physicalScaleFactor] - 1.0 ) > 0.01) ? NSOffState : NSOnState];
//            return true
//        }
//        } else if ([[SKSnapshotPDFView superclass] instancesRespondToSelector:_cmd]) {
//            return [super validateMenuItem:menuItem];
//        }
        return true
    }
}