PDF_Office/PDF Office/PDF Master/Class/PDFTools/Crop/Controller/KMCropPreviewController.swift

//
//  KMCropPreviewController.swift
//  PDF Reader Pro
//
//  Created by tangchao on 2022/12/29.
//

import Cocoa
import PDFKit

extension CPDFPage {
    private static var _drawingPage = "cropDrawingPage"
    var cropDrawingPage: CPDFPage? {
        get {
            return (objc_getAssociatedObject(self, &CPDFPage._drawingPage) as? CPDFPage)
        }
        set {
            objc_setAssociatedObject(self, &CPDFPage._drawingPage, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }
    
    var cropOffsetX: CGFloat {
        get {
            return objc_getAssociatedObject(self, "cropOffsetX") as! CGFloat
        }
        set {
            objc_setAssociatedObject(self, "cropOffsetX", newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_ASSIGN)
        }
    }
    
    var cropOffsetY: CGFloat {
        get {
            return objc_getAssociatedObject(self, "cropOffsetY") as! CGFloat
        }
        set {
            objc_setAssociatedObject(self, "cropOffsetY", newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_ASSIGN)
        }
    }
    
    var isChangePageSize: Bool {
        get {
            return objc_getAssociatedObject(self, "isChangePageSize") as! Bool
        }
        set {
            objc_setAssociatedObject(self, "isChangePageSize", newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_ASSIGN)
        }
    }
    
    var cropRect: NSRect {
        get {
            return objc_getAssociatedObject(self, "cropRect") as! NSRect
        }
        set {
            objc_setAssociatedObject(self, "cropRect", newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_ASSIGN)
        }
    }
}

class KMCropInfo: NSObject {
    var drawPage: CPDFPage!
    var cropOffsetX: CGFloat = 0
    var cropOffsetY: CGFloat = 0
    var isChangePageSize: Bool = false
    var cropRect: NSRect!
}

class KMCropPDFView: CPDFView {
    
    var drawInfo: Array<KMCropInfo> = []
    
    override func draw(_ page: CPDFPage!, to context: CGContext!) {
        super.draw(page, to: context)
        
        if (self.drawInfo.count > 0) {
            drawCropPage(page, to: context)
        }
        drawCropPage(page: page, toContext: context)
    }
    
    private func drawCropPage(page: CPDFPage, toContext context: CGContext) {
        if (page.cropDrawingPage != nil) {
            let originalRect = page.bounds(for: .mediaBox)
            let drawPage = page.cropDrawingPage
            let cropRect = drawPage?.bounds(for: .mediaBox)
            let orgPageWidth = cropRect?.size.width
            let orgPageHeight = cropRect?.size.height
            
            let spaceX = page.cropOffsetX
            let spaceY = page.cropOffsetY
            let scanl = min(originalRect.size.width/(orgPageWidth ?? 0), originalRect.size.height/(orgPageHeight ?? 1))
            
            NSGraphicsContext.saveGraphicsState()
            
            context.translateBy(x: spaceX, y: spaceY)
            context.scaleBy(x: scanl, y: scanl)
            
            if #available(macOS 10.12, *) {
                drawPage?.draw(with: .cropBox, to: context)
                drawPage?.transform(context, for: .cropBox)
            } else {
                NSGraphicsContext.saveGraphicsState()
                NSGraphicsContext.current = NSGraphicsContext(cgContext: context, flipped: true)
                drawPage?.draw(with: .cropBox, to: context)
                NSGraphicsContext.restoreGraphicsState()
                drawPage?.transform(context, for: .cropBox)
            }
            
            if !page.isChangePageSize {
                let tCropRect = page.cropRect
                let w1 = (orgPageWidth ?? 0) - tCropRect.size.width - tCropRect.origin.x
                
                context.setFillColor(red: 0, green: 0, blue: 0, alpha: 0.3)
                let rect1 = CGRect(x: 0, y: 0, width: orgPageWidth ?? 0, height: tCropRect.origin.y)
                let rect2 = CGRect(x: 0, y: tCropRect.origin.y + tCropRect.size.height, width: orgPageWidth ?? 0, height: (orgPageHeight ?? 0) - tCropRect.origin.y - tCropRect.size.height)
                let rect3 = CGRect(x: 0, y: tCropRect.origin.y, width: tCropRect.origin.x, height: tCropRect.size.height)
                let rect4 = CGRect(x: tCropRect.origin.x + tCropRect.size.width, y: tCropRect.origin.y, width: max(w1, 0), height: tCropRect.size.height)
                context.fill(rect1)
                context.fill(rect2)
                context.fill(rect3)
                context.fill(rect4)
            }
            
            NSGraphicsContext.restoreGraphicsState()
        }
    }
    
    private func drawCropPage(_ cropPage: CPDFPage, to context: CGContext!) {
//        let myPage: KMCropPDFPage = cropPage as! KMCropPDFPage
        let info: KMCropInfo = self.drawInfo[Int(self.document.index(for: cropPage))]
        if (info.drawPage != nil) {
            let originalRect = cropPage.bounds(for: .mediaBox)
            let drawPage = info.drawPage
            let cropRect = drawPage!.bounds(for: .mediaBox)
            /// 原始page的宽度（不管有没有旋转，都是旋转度数等于0）
            let orgPageWidth: CGFloat = NSWidth(cropRect)
            /// 原始page的高度
            let orgPageHeight: CGFloat = NSHeight(cropRect)
            
            let spaceX = info.cropOffsetX
            let spaceY = info.cropOffsetY
            
            let scale: CGFloat = min(NSWidth(originalRect)/orgPageWidth, NSHeight(originalRect)/orgPageHeight)
            
            NSGraphicsContext.saveGraphicsState()
            
            context.translateBy(x: spaceX,y: spaceY)
            context.scaleBy(x: scale, y: scale)
            
            if #available(macOS 10.12, *) {
                drawPage?.draw(with: .cropBox, to: context)
                drawPage?.transform(context, for: .cropBox)
            } else {
                NSGraphicsContext.saveGraphicsState()
                NSGraphicsContext.current = NSGraphicsContext(cgContext: context, flipped: false)
                drawPage?.draw(with: .cropBox, to: context)
                drawPage?.transform(context, for: .cropBox)
            }
            
            if (info.isChangePageSize) {
                let tCropRect: NSRect = cropPage.cropRect
                let w1: CGFloat = orgPageWidth-(tCropRect.size.width)-(tCropRect.origin.x)
                
                context.setFillColor(red: 0, green: 0, blue: 0, alpha: 0.3)
                let rect1: NSRect = NSMakeRect(0, 0, orgPageWidth, (tCropRect.origin.y))
                let rect2: NSRect = NSMakeRect(0, (tCropRect.origin.y)+(tCropRect.size.height), orgPageWidth,     orgPageHeight - tCropRect.origin.y-tCropRect.size.height)
                let rect3: NSRect = NSMakeRect(0, tCropRect.origin.y,tCropRect.origin.x,tCropRect.size.height);
                var rect4Y = w1
                if (w1 > 0) {
                    rect4Y = 0
                }
                let rect4: NSRect = NSMakeRect(tCropRect.origin.x+tCropRect.size.width, tCropRect.origin.y,rect4Y,tCropRect.size.height)
                
                context.fill(rect1)
                context.fill(rect2)
                context.fill(rect3)
                context.fill(rect4)
            }
            
            NSGraphicsContext.restoreGraphicsState()
        }
    }
}

class KMCropPDFPage: CPDFPage {
//    var drawingPage: CPDFPage!
//    var cropOffsetX: CGFloat = 0
//    var cropOffsetY: CGFloat = 0
    
//    var isChangePageSize: Bool = false
//    var cropRect: NSRect!
    
    override func draw(with box: CPDFDisplayBox, to context: CGContext!) {
        super.draw(with: box, to: context)
        
        let pageSize: NSSize = self.bounds(for: .mediaBox).size
        drawPage(with: context, page: self.cropDrawingPage!, pageSize: pageSize)
    }
    
    private func drawPage(with context: CGContext, page: CPDFPage, pageSize: NSSize) {
        let myPage: KMCropPDFPage = page as! KMCropPDFPage
        
        var originalSize: NSSize = page.bounds(for: .mediaBox).size
        
        //如果page的旋转角度为90,或者270，宽高交换
        if (page.rotation % 180 != 0) {
            originalSize = NSMakeSize(originalSize.height, originalSize.width)
        }
        
        context.saveGState()
        context.translateBy(x: myPage.cropOffsetX, y: myPage.cropOffsetY)
        
        if #available(macOS 10.12, *) {
            page.draw(with: .cropBox, to: context)
            page.transform(context, for: .cropBox)
        } else {
            NSGraphicsContext.saveGraphicsState()
            NSGraphicsContext.current = NSGraphicsContext(cgContext: context, flipped: true)
            page.draw(with: .cropBox, to: context)
            
            NSGraphicsContext.restoreGraphicsState()
            page.transform(context, for: .cropBox)
        }
        
        context.restoreGState()
    }
}

class KMCropPreviewController: KMWatermarkAdjectivePreViewBaseController {

//    var testPreView: PDFView!
    
    var tipView = KMCropTipView()
    
    var windowController: KMCropSettingWindowController!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let itemTitles = [["裁剪"]]
        var itemModels: Array<Array<KMWatermarkAdjectiveTopBarItemModel>> = []
        for items in itemTitles {
            var array: Array<KMWatermarkAdjectiveTopBarItemModel> = []
            for title in items {
                let model = KMWatermarkAdjectiveTopBarItemModel()
                model.iconName = ""
                model.itemTitle = title
                array.append(model)
            }
            itemModels.append(array)
        }
        
        self.topBarView.initItemData(itemArrays: itemModels)
        
        let preView: CPDFListView = CPDFListView()
        self.preView = preView
        self.preView.frame = self.preViewBox.contentView!.bounds
        self.preView.autoresizingMask = NSView.AutoresizingMask(rawValue: 18)
        self.preViewBox.contentView?.addSubview(self.preView)
        self.preView.autoScales = true
        self.preView.displaysAsBook = true
        self.preView.delegate = self
        
        let myPreView: CPDFListView = self.preView as! CPDFListView
        myPreView.pdfListViewDelegate = self
        
//        NotificationCenter.default.addObserver(self, selector: #selector(preViewSelectionDidChange), name: NSNotification.Name.CPDFViewSelectionChanged, object: nil)
        
//        self.testPreView = PDFView()
//        self.testPreView.frame = self.preViewBox.contentView!.bounds
//        self.testPreView.autoresizingMask = NSView.AutoresizingMask(rawValue: 18)
//        self.preViewBox.contentView?.addSubview(self.testPreView)
        
        self.topBarView.isCanApply(can: false)
        
        self.tipView.frame = self.tipBox.contentView!.frame
        self.tipView.autoresizingMask = NSView.AutoresizingMask(rawValue: 18)
        self.tipBox.addSubview(self.tipView)
        self.tipBox.isHidden = true
        
        self.tipView.enterAction = {
            () in
            let myPreView: CPDFListView = self.preView as! CPDFListView
            var rect = NSIntegralRect(myPreView.currentSelectionRect())
            if (NSIsEmptyRect(rect)) {
                return
            }
            
            let window = KMCropSettingWindowController(windowNibName: "KMCropSettingWindowController")
            self.view.window?.beginSheet(window.window!)
            self.windowController = window
            
            window.itemClick = { [self]
                (index: Int) in
                if (index == 1) { /// 取消
                    self.view.window?.endSheet((self.windowController?.window)!)
                    self.windowController = nil
                    return
                }
                let pageRangeType = self.windowController.pageRangeIndex
                let pageCount: Int = Int(self.preView.document.pageCount)
                var pages: Array<Int> = []
                if (pageRangeType == 0) { /// 当前页面
                    pages.append(self.preView.currentPageIndex)
                } else if (pageRangeType == 1) { /// 全部页面
                    for i in 0 ..< pageCount {
                        pages.append(i)
                    }
                } else if (pageRangeType == 2) { /// 奇数页面
                    var string: String = ""
                    for i in 0 ..< pageCount {
                        if (i % 2 == 1) {
                            continue
                        }
                        
                        pages.append(i)
                    }
                } else if (pageRangeType == 3) { /// 偶数页面
                    var string: String = ""
                    for i in 0 ..< pageCount {
                        if (i % 2 == 0) {
                            continue
                        }
                        
                        pages.append(i)
                    }
                } else { /// 自定义
                    for i in self.windowController.pageRangePages {
                        pages.append(i)
                    }
                }
                
                if (pages.count < 0) {
                    let alert = NSAlert()
                    alert.messageText = "请选择页面"
                    alert.runModal()
                    return
                }
                
                var pageSize: NSSize = NSZeroSize
                if (self.windowController.pageSize == "None") {
                    
                } else {
                    pageSize = KMCropTools.getPageSizeValue(self.windowController.pageSize)
                }
                
                for i in pages {
                    let myPreView: CPDFListView = self.preView as! CPDFListView
                    var page: CPDFPage = self.preView.document.page(at: UInt(i))
                    var rect = NSIntegralRect(myPreView.selectionRect)

                    if (NSIsEmptyRect(rect)) {
                        rect = getPageForegroundBox(page)
                    }
                    
                    var newRect = NSIntersectionRect(rect, (page.bounds(for: .mediaBox)))
                    page.setBounds(newRect, for: .cropBox)
                    
                    if (pageSize.width == 0 && pageSize.height == 0) {
                        
                    } else {
                        let tiffData = page.PDFListViewTIFFData(for: rect)
                        let index: UInt = (page.pageIndex())
//                        let newPage: CPDFPage = CPDFPage(image: NSImage(data: tiffData!))
                        
                        self.preView.document.removePage(at: index)
//                        newPage.setBounds(NSMakeRect(0, 0, pageSize.width, pageSize.height), for: .cropBox)
                        //        let result = self.preView.document.insertPageObject(newPage, at: index)
                        let result = self.preView.document.insertPage(pageSize, at: index)
                    }
                }
                
                /// 保存到临时路径
                let toPath: String = self.preView.document.documentURL.path
                let documentPath = NSTemporaryDirectory()
                let tempPath: String = "\(documentPath)/\(toPath.lastPathComponent)"
                if (FileManager.default.fileExists(atPath: tempPath)) {
                    try?FileManager.default.removeItem(atPath: tempPath)
                }

                let result = self.preView.document.write(to: URL(fileURLWithPath: tempPath))
                if (result) {
                    if (FileManager.default.fileExists(atPath: toPath)) {
                        try?FileManager.default.removeItem(atPath: toPath)
                    }
                    
                    try?FileManager.default.moveItem(atPath: tempPath, toPath: toPath)
                } else {
                    try?FileManager.default.removeItem(atPath: tempPath)
                }
                DispatchQueue.main.async {
                    let myPreView: CPDFListView = self.preView as! CPDFListView
                    myPreView.toolMode = .textToolMode

                    /// 刷新预览视图
                    self.preView.layoutDocumentView()
                    
                    self.preView.displayBox = .cropBox
                }
                
                /// 裁剪
                self.view.window?.endSheet((self.windowController?.window)!)
                self.windowController = nil
                
//                self.cropCurrentPage(in: NSZeroSize)
                
                let count: Int = Int(self.preView.document!.pageCount)
//                let PDFView = KMCropPDFView()
//                PDFView.frame = self.preView.bounds
//                self.preView.superview?.addSubview(PDFView)
//                PDFView.document = CPDFDocument(url: self.preView.document.documentURL)
//                for i in 0 ..< count {
//                    let page: KMCropPDFPage = KMCropPDFPage()
//                    page.setBounds(NSMakeRect(0, 0, 200, 200), for: .mediaBox)
//                    let cropPage = self.preView.document.page(at: UInt(i))
//                    page.cropDrawingPage = cropPage
////                    self.preView.document.insertPageObject(page, at: UInt(i))
////                    self.preView.document.removePage(at: UInt(i))
//                    let currentPage = page.cropDrawingPage
//                    let drawInfo = KMCropInfo()
//                    drawInfo.drawPage = cropPage
//                    PDFView.drawInfo.append(drawInfo)
//                    PDFView.document.insertPageObject(page, at: UInt(i))
//                }
                
                /// 保存到临时路径
//                let toPath: String = self.preView.document.documentURL.lastPathComponent
//                let documentPath = NSTemporaryDirectory()
//                let tempPath: String = "\(documentPath)/\(toPath)"
//                if (FileManager.default.fileExists(atPath: tempPath)) {
//                    try?FileManager.default.removeItem(atPath: tempPath)
//                }
//
//                let result = PDFView.document.write(to: URL(fileURLWithPath: tempPath))
//
//                DispatchQueue.main.async {
//                    let myPreView: CPDFListView = self.preView as! CPDFListView
//                    myPreView.toolMode = .textToolMode
//
//                    self.preView.layoutDocumentView()
//                }
            }
            
        }
    }
    
//    @objc func preViewSelectionDidChange(sender: NSNotification) {
//        if (self.preView.isEqual(to: sender.object)) {
////            self.preView.currentSelection
//            print("1111111111")
//
////            NSUInteger eventMask = NSEventMaskLeftMouseUp | NSEventMaskLeftMouseDragged;
////            let theEvent = [self.view.window.nextEventMatchingMask:NSEventMaskLeftMouseUp];
////            let theEvent = self.view.window?.nextEvent(matching: .leftMouseUp.union(.rightMouseUp).union(.otherMouseUp))
////            if (theEvent?.type == .leftMouseUp) {
//            let myPreview: CPDFListView = self.preView as! CPDFListView
//            if (NSIsEmptyRect(myPreview.selectionRect)) {
//                print("end")
//            }
//        }
//    }
    
    override func viewDidAppear() {
        super.viewDidAppear()
        
//        if (self.documentURL != nil) {
//            self.testPreView.document = PDFDocument(url: self.documentURL)
//        }
    }
    
    override func topItemClick(index: Int) {
        let menu = NSMenu()
        
        let titles = ["裁剪当前页面 - 白边距", "裁剪所有页面 - 自动", "自定义裁剪区域"]
        for title in titles {
            let item = NSMenuItem(title: title, action: #selector(itemAction), target: self)
            item.tag = titles.firstIndex(of: title)!
            menu.addItem(item)
        }
        
        menu.popUp(positioning: nil, at: NSPoint(x: self.topBarView.frame.midX-100, y: 0), in: self.topBarView)
    }
    
    @objc private func itemAction(sender: NSMenuItem) {
        if (sender.tag == 0) {
            /// 裁剪当前页面 - 白边距
            self.tipBox.isHidden = true
            cropCurrentPage()
            return
        }
        
        if (sender.tag == 1) {
            /// 裁剪所有页面 - 自动
            self.tipBox.isHidden = true
            cropAllPate()
            return
        }
        
        //// 自定义裁剪区域
        let myPreView: CPDFListView = self.preView as! CPDFListView
        myPreView.toolMode = .selectToolMode
        
        self.preView.autoScales = true
        self.preView.autoScales = false
        var pageHeight: CGFloat = NSHeight(self.preView.currentPage().bounds(for: self.preView.displayBox))
        if (self.preView.displaysPageBreaks) {
            pageHeight += 8
        }
        
        var scaleFactor: CGFloat = fmax(self.preView.minimumScaleFactor, NSHeight(self.preView.frame)/pageHeight)
//        if (scaleFactor < self.preView.scaleFactor) {
            self.preView.scaleFactor = scaleFactor
//        }
        
        self.tipBox.isHidden = false
        self.tipView.setString(string: "请框选裁剪区域")
    }
    
    private func cropCurrentPage(in pageSize: NSSize) {
        let myPreView: CPDFListView = self.preView as! CPDFListView
        var rect = NSIntegralRect(myPreView.currentSelectionRect())
        var page: CPDFPage?
        if ((myPreView.currentSelectionPage()) != nil) {
            page = myPreView.currentSelectionPage()
        } else {
            page = myPreView.currentPage()
        }

        if (NSIsEmptyRect(rect)) {
            rect = getPageForegroundBox(page!)
        }
        
        let tiffData = page!.PDFListViewTIFFData(for: rect)
        
        let index: UInt = (page?.pageIndex())!
        
        var newRect = NSIntersectionRect(rect, (page?.bounds(for: .mediaBox))!)
        page?.setBounds(newRect, for: .cropBox)
        
        self.preView.document.removePage(at: index)
        
//        let newPage: CPDFPage = CPDFPage(image: NSImage(data: tiffData!))
//        newPage.setBounds(NSMakeRect(0, 0, pageSize.width, pageSize.height), for: .cropBox)
//        let result = self.preView.document.insertPageObject(newPage, at: index)
        
        let result = self.preView.document.insertPage(pageSize, at: index)
//        var newDoc = CPDFDocument()
        
        /// 刷新预览视图
        self.preView.layoutDocumentView()
        
        self.preView.displayBox = .cropBox
    }
    
    private func cropAllPate() {
        var size = NSZeroSize
        for i in 0 ..< self.preView.document.pageCount {
            let page = self.preView.document.page(at: i)
            var rect = getPageForegroundBox(page!)
            size.width = fmax(size.width, NSWidth(rect))
            size.height = fmax(size.height, NSHeight(rect))
        }
        
        var rectArray: Array<NSRect> = []
        for i in 0 ..< self.preView.document.pageCount {
            let page = self.preView.document.page(at: i)
            var rect = getPageForegroundBox(page!)
            var bounds: NSRect = (page?.bounds(for: .mediaBox))!
            if (rect.minX - bounds.minX > bounds.maxX-rect.maxX) {
                rect.origin.x = rect.maxX-size.width
            }
            
            rect.origin.y = rect.maxY-size.height
            rect.size = size
            
            if (NSWidth(rect) > NSWidth(bounds)) {
                rect.size.width = NSWidth(bounds)
            }
            if (NSHeight(rect) > NSHeight(bounds)) {
                rect.size.height = NSHeight(bounds)
            }
            
            if (NSMinX(rect) < NSMinX(bounds)) {
                rect.origin.x = NSMinX(bounds)
            } else if (NSMaxX(rect) > NSMaxX(bounds)) {
                rect.origin.x = NSMaxX(bounds) - NSWidth(rect)
            }
            
            if (NSMinY(rect) < NSMinY(bounds)) {
                rect.origin.y = NSMinY(bounds)
            } else if (NSMaxY(rect) > NSMaxY(bounds)) {
                rect.origin.y = NSMaxY(bounds) - NSHeight(rect)
            }
            
            rectArray.append(rect)
        }
        
        cropPages(to: rectArray)
    }
    
    private func cropPages(to rects: Array<NSRect>) {
        let currentPage = self.preView.currentPage()
        let visibleRect: NSRect = self.preView.convert(self.preView.convert(self.preView.documentView().visibleRect, from: self.preView.documentView()), to: self.preView.currentPage())
        
        var oldRectArray: Array<NSRect> = []
        for i in 0 ..< self.preView.document.pageCount {
            let page = self.preView.document.page(at: i)
            var rect = NSIntersectionRect(rects[Int(i)], (page?.bounds(for: .mediaBox))!)
            let oldRect = page?.bounds(for: .cropBox)
            oldRectArray.append(oldRect!)
            
            page?.setBounds(rect, for: .cropBox)
        }
        
        /// 刷新预览视图
        self.preView.layoutDocumentView()
        
        self.preView.displayBox = .cropBox
        
        self.preView.go(to: currentPage)
        self.preView.go(to: visibleRect, on: currentPage)

    }
    
    private func cropCurrentPage() {
        let myPreView: CPDFListView = self.preView as! CPDFListView
        var rect = NSIntegralRect(myPreView.currentSelectionRect())
        var page: CPDFPage?
        if ((myPreView.currentSelectionPage()) != nil) {
            page = myPreView.currentSelectionPage()
        } else {
            page = myPreView.currentPage()
        }

        if (NSIsEmptyRect(rect)) {
            rect = getPageForegroundBox(page!)
        }
        
        let index: UInt = (page?.pageIndex())!
        cropPage(at: index, in: rect)
    }
    
    func cropPage(at index: UInt, in rect: NSRect) {
        let oldRect = self.preView.document.page(at: index)?.bounds(for: .cropBox)
        /// undo \ redo 处理
        
//        NSUndoManager *undoManager = [[self document] undoManager];
//        let undoManager = UndoManager()
//        (undoManager.prepare(withInvocationTarget: self) as! KMCropPreviewController).cropPage(at: index, in: oldRect!)
//        undoManager.setActionName(NSLocalizedString("Crop Page", comment: "Undo action name"))
//        [[self document] undoableActionIsDiscardable];
        
        var page = self.preView.document.page(at: index)
        var newRect = NSIntersectionRect(rect, (page?.bounds(for: .mediaBox))!)
        page?.setBounds(newRect, for: .cropBox)
        
        /// 刷新预览视图
        self.preView.layoutDocumentView()
        
        self.preView.displayBox = .cropBox
    }

    private func getPageForegroundBox(_ page: CPDFPage) -> NSRect {
        let marginWidth: CGFloat = 10
        let marginHeight: CGFloat = 10
        
        let imageRep = newBitmapImageRepForBox(page, .mediaBox)
        let bounds = page.bounds(for: .mediaBox)
        var foregroundBox = imageRep.foregroundRect()
        if (imageRep == nil) {
            foregroundBox = bounds
        } else if (NSIsEmptyRect(foregroundBox)) {
            let centerPoint = NSPoint(x: bounds.midX, y: bounds.midY)
            let origin = NSPoint(x: round(centerPoint.x), y: round(centerPoint.y))
            foregroundBox.origin = origin
            foregroundBox.size = NSZeroSize
        } else {
            let origin = NSPoint(x: foregroundBox.origin.x+bounds.origin.x, y: foregroundBox.origin.y+bounds.origin.y)
            foregroundBox.origin = origin
        }
        
        return NSIntegralRect(NSInsetRect(foregroundBox, -marginWidth, -marginHeight))
    }
    
    private func newBitmapImageRepForBox(_ page: CPDFPage, _ box: CPDFDisplayBox) -> NSBitmapImageRep {
        let bounds = page.bounds(for: box)
        var imageRep = NSBitmapImageRep(bitmapDataPlanes: nil,
                                        pixelsWide: Int(NSWidth(bounds)),
                                        pixelsHigh: Int(NSHeight(bounds)),
                                        bitsPerSample: 8,
                                        samplesPerPixel: 4,
                                        hasAlpha: true,
                                        isPlanar: false,
                                        colorSpaceName: .calibratedRGB,
                                        bitmapFormat: NSBitmapImageRep.Format(rawValue: 0),
                                        bytesPerRow: 0,
                                        bitsPerPixel: 32)
        
        if (imageRep != nil) {
            NSGraphicsContext.saveGraphicsState()
            NSGraphicsContext.current = NSGraphicsContext.init(bitmapImageRep: imageRep!)
            NSGraphicsContext.current?.imageInterpolation = .none
            NSGraphicsContext.current?.shouldAntialias = false
            if (page.rotation != 0) {
                var transform = NSAffineTransform()
                if (page.rotation == 90) {
                    transform.translateX(by: NSWidth(bounds), yBy: 0)
                } else if (page.rotation == 180) {
                    transform.translateX(by: NSHeight(bounds), yBy: NSWidth(bounds))
                } else if (page.rotation == 270) {
                    transform.translateX(by: 0, yBy: NSHeight(bounds))
                }
                
                transform.rotate(byDegrees: CGFloat(page.rotation))
                transform.concat()
            }
            
            page.draw(with: box, to: (NSGraphicsContext.current?.cgContext as! CGContext))
//            page.draw(with: box)
            NSGraphicsContext.current?.imageInterpolation = .default
            NSGraphicsContext.restoreGraphicsState()
        }
        
        return imageRep!
    }
}

extension KMCropPreviewController: CPDFViewDelegate {
    func pdfViewEditingSelectionDidChanged(_ pdfView: CPDFView!) {
        
    }
}

extension KMCropPreviewController: CPDFListViewDelegate {
    func pdfListViewDidSelectionEnd(_ pdfListView: CPDFListView!) {
        if (self.preView.isEqual(to: pdfListView)) {
            self.tipView.setString(string: "请按 Enter 键确定裁剪区域")
        }
    }
}

//extension PDFPage {
//    func getPageForegroundBox() -> NSRect {
//        let marginWidth: CGFloat = 10
//        let marginHeight: CGFloat = 10
//
//        let imageRep = newBitmapImageRepForBox(.mediaBox)
//        let bounds = bounds(for: .mediaBox)
//        var foregroundBox = imageRep.foregroundRect()
//        if (imageRep == nil) {
//            foregroundBox = bounds
//        } else if (NSIsEmptyRect(foregroundBox)) {
//            let centerPoint = NSPoint(x: bounds.midX, y: bounds.midY)
//            let origin = NSPoint(x: round(centerPoint.x), y: round(centerPoint.y))
//            foregroundBox.origin = origin
//            foregroundBox.size = NSZeroSize
//        } else {
//            let origin = NSPoint(x: foregroundBox.origin.x+bounds.origin.x, y: foregroundBox.origin.y+bounds.origin.y)
//            foregroundBox.origin = origin
//        }
//
//        return NSIntegralRect(NSInsetRect(foregroundBox, -marginWidth, -marginHeight))
//    }
//
//    func newBitmapImageRepForBox(_ box: PDFDisplayBox) -> NSBitmapImageRep {
//        let bounds = bounds(for: box)
//        let imageRep = NSBitmapImageRep(bitmapDataPlanes: nil,
//                                        pixelsWide: Int(NSWidth(bounds)),
//                                        pixelsHigh: Int(NSHeight(bounds)),
//                                        bitsPerSample: 8,
//                                        samplesPerPixel: 4,
//                                        hasAlpha: true,
//                                        isPlanar: false,
//                                        colorSpaceName: .calibratedRGB,
//                                        bitmapFormat: NSBitmapImageRep.Format(rawValue: 0),
//                                        bytesPerRow: 0,
//                                        bitsPerPixel: 32)
//
//        if (imageRep != nil) {
//            NSGraphicsContext.saveGraphicsState()
//            NSGraphicsContext.current = NSGraphicsContext.init(bitmapImageRep: imageRep!)
//            NSGraphicsContext.current?.imageInterpolation = .none
//            NSGraphicsContext.current?.shouldAntialias = false
//            if (self.rotation != 0) {
//                let transform = NSAffineTransform()
//                if (self.rotation == 90) {
//                    transform.translateX(by: NSWidth(bounds), yBy: 0)
//                } else if (self.rotation == 180) {
//                    transform.translateX(by: NSHeight(bounds), yBy: NSWidth(bounds))
//                } else if (self.rotation == 270) {
//                    transform.translateX(by: 0, yBy: NSHeight(bounds))
//                }
//
//                transform.rotate(byDegrees: CGFloat(self.rotation))
//                transform.concat()
//            }
//
//            draw(with: box)
//            NSGraphicsContext.current?.imageInterpolation = .default
//            NSGraphicsContext.restoreGraphicsState()
//        }
//
//        return imageRep!
//    }
//}