/*

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

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    This is the Shape View which handles displaying / user interaction when editing an individual shape document.

*/

import UIKit

import SceneKit

/**

    The `ShapeView` class interceps touch events so we know when the document has 

    been edited so we should save the changes to disk.

*/

class ShapeView: SCNView {

    // MARK: - Properties

    var document: ShapeDocument? {

        didSet {

            guard let document = document else { return }

            document.setSceneOnRenderer(self)

            self.backgroundColor = document.backgroundColor

        }

    }

    // MARK: - Initialization

    override func awakeFromNib() {

        autoenablesDefaultLighting = true

        allowsCameraControl = true

    }

    // MARK: - Override

    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {

        /*

            The user finished interacting with the shape for now, so notify the

            document that changes happened so that it writes the new document

            state to disk.

        */

        guard let pointOfView = pointOfView else { return }

        document?.updateCameraState(pointOfView)

    }

}