/*

 Copyright (C) 2016 Apple Inc. All Rights Reserved.

 See LICENSE.txt for this sample’s licensing information

 Abstract:

 The ImageSizeViewController has two text fields to set the image width and height. The text fields are bound in IB to the dynamic properties of the same name.

 */

import Cocoa

class ImageSizeViewController: NSViewController {

    @IBOutlet weak var widthField: NSTextField!

    @IBOutlet weak var heightField: NSTextField!

    @IBOutlet weak var constrainCheckbox: NSButton!

    dynamic var width: CGFloat = 0 // for bindings

    dynamic var height: CGFloat = 0  // for bindings

    var completionHandler: ((NSSize, NSModalResponse) -> Void)?

    private var ratio: CGFloat = 1

    var imageSize: NSSize {

        get {

            return NSSize(width: width, height: height)

        }

        set {

            (width, height) = (newValue.width, newValue.height)

            ratio = (height > 0) ? width / height : 1.0

        }

    }

    override func viewDidLoad() {

        super.viewDidLoad()

    }

    @IBAction func didEditField(_ sender: NSTextField!) {

        guard constrainCheckbox.state == NSOnState else { return }

        switch sender {

            case widthField:

                height = width / ratio

            case heightField:

                width = height * ratio

            default:

                break

        }

    }

    @IBAction func cancel(_ sender: AnyObject!) {

        dismiss(sender)

        completionHandler?(NSZeroSize, NSModalResponseCancel)

    }

    @IBAction func ok(_ sender: AnyObject!) {

        dismiss(sender)

        completionHandler?(imageSize, NSModalResponseOK)

    }

}