PDF_Office/PDF Office/PDF Master/KMClass/Tools/PDFPreview/KMNPDFPreView.swift

//
//  KMNPDFPreView.swift
//  PDF Reader Pro
//
//  Created by User-Tangchao on 2024/10/23.
//

import Cocoa

class KMNPDFPreView: NSView {
    // MARK: - lazy
    
    private lazy var contentBox_: NSBox = {
        let box = NSBox()
        box.boxType = .custom
        box.titlePosition = .noTitle
        box.contentViewMargins = .zero
        box.borderWidth = 0
        return box
    }()
    
    lazy var pdfView: CPDFView = {
        let view = CPDFView()
        view.setDisplay(.singlePage)
        view.layoutDocumentView()
        view.autoScales = true
        view.delegate = self
        return view
    }()
    
    var contentInset: NSEdgeInsets = .init(top: 0, left: 0, bottom: 0, right: 0) {
        didSet {
            self.needsLayout = true
        }
    }
    
    var currentPageDidChanged: KMItemClickBlock<KMNPDFPreView>?

    deinit {
        KMPrint("KMNPDFPreView deinit.")
    }
    
    convenience init(fileUrl: URL, password: String?) {
        self.init()
        
        initSubviews()
        initDefaultValue()
        
        setFileUrl(fileUrl, password: password)
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        
        initSubviews()
        initDefaultValue()
    }
    
    func initSubviews() {
        self.addSubview(self.contentBox_)
        
        self.contentBox_.contentView = self.pdfView
    }
    
    func initDefaultValue() {
        self.contentBox_.borderWidth = 0
//        self.contentBox_.borderColor = .red
    }
    
    func setFileUrl(_ fileUrl: URL, password: String?) {
        let document = CPDFDocument(url: fileUrl)
        let isLocked = document?.isLocked ?? false
        if isLocked {
            document?.unlock(withPassword: password ?? "")
        }
        pdfView.document = document
    }
    
    override func layout() {
        super.layout()
        
        let theFrame = self.bounds
        let contentX = self.contentInset.left
        let contentY = self.contentInset.top
        let contentW = NSWidth(theFrame)-contentX-self.contentInset.right
        let contentH = NSHeight(theFrame)-contentY-self.contentInset.bottom
        self.contentBox_.frame = NSMakeRect(contentX, contentY, contentW, contentH)
    }
    
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)

        // Drawing code here.
    }
}

extension KMNPDFPreView: CPDFViewDelegate {
    func pdfViewCurrentPageDidChanged(_ pdfView: CPDFView!) {
        self.currentPageDidChanged?(self, 1)
    }
}