/*

Copyright (C) 2017 Apple Inc. All Rights Reserved.

See LICENSE.txt for this sample’s licensing information

Abstract:

The app's view controller which presents viewable content.

*/

import UIKit

class DataViewController: UIViewController {

    @IBOutlet weak var scrollView: TiledPDFScrollView!

    var pdf: CGPDFDocument!

    var page: CGPDFPage!

    var pageNumber: Int = 0

    var myScale: CGFloat = 0

    override func viewDidLoad()

    {

        super.viewDidLoad()

        // Do any additional setup after loading the view, typically from a nib.

        page = pdf.page(at: pageNumber)

        scrollView.setPDFPage(page)

        // Disable zooming if our pages are currently shown in landscape, for new views

        scrollView.isUserInteractionEnabled = UIApplication.shared.statusBarOrientation.isPortrait

    }

    override func viewDidLayoutSubviews()

    {

        restoreScale()

    }

    override func viewWillTransition(to size: CGSize, with coordinator: UIViewControllerTransitionCoordinator)

    {

        super.viewWillTransition(to: size, with: coordinator)

        coordinator.animate(alongsideTransition: nil, completion: { context in

            // Disable zooming if our pages are currently shown in landscape after orientation changes

            self.scrollView.isUserInteractionEnabled = UIApplication.shared.statusBarOrientation.isPortrait

        })

    }

    func restoreScale()

    {

        // Called on orientation change.

        // We need to zoom out and basically reset the scrollview to look right in two-page spline view.

        let pageRect = page.getBoxRect(CGPDFBox.mediaBox)

        let yScale = view.frame.size.height / pageRect.size.height

        let xScale = view.frame.size.width / pageRect.size.width

        myScale = min(xScale, yScale)

        scrollView.bounds = view.bounds

        scrollView.zoomScale = 1.0

        scrollView.PDFScale = myScale

        scrollView.tiledPDFView.bounds = view.bounds

        scrollView.tiledPDFView.myScale = myScale

        scrollView.tiledPDFView.layer.setNeedsDisplay()

    }

}