KCD/ScreenshotDetailViewController.swift

   1 //
   2 //  ScreenshotDetailViewController.swift
   3 //  KCD
   4 //
   5 //  Created by Hori,Masaki on 2016/12/29.
   6 //  Copyright © 2016年 Hori,Masaki. All rights reserved.
   7 //
   8
   9 import Cocoa
  10
  11 final class ScreenshotDetailViewController: BridgeViewController {
  12
  13     deinit {
  14
  15         arrayController.removeObserver(self, forKeyPath: NSSelectionIndexesBinding)
  16     }
  17
  18     @IBOutlet var imageView: ImageView!
  19
  20     override var nibName: String! {
  21
  22         return "ScreenshotDetailViewController"
  23     }
  24
  25     override var contentRect: NSRect {
  26
  27         return imageView.convert(imageView.imageRect, to: nil)
  28     }
  29
  30     private var currentSelection: [ScreenshotInformation] = []
  31
  32     override func viewDidLoad() {
  33
  34         super.viewDidLoad()
  35
  36         arrayController.addObserver(self, forKeyPath: NSSelectionIndexesBinding, context: nil)
  37         updateSelections()
  38     }
  39
  40     override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey: Any]?, context: UnsafeMutableRawPointer?) {
  41
  42         if keyPath == NSSelectionIndexesBinding {
  43
  44             updateSelections()
  45
  46             return
  47         }
  48
  49         super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
  50     }
  51
  52     private func updateSelections() {
  53
  54         guard let selection = arrayController.selectedObjects as? [ScreenshotInformation]
  55             else { return }
  56
  57         if currentSelection == selection { return }
  58
  59         imageView.images = selection.flatMap { NSImage(contentsOf: $0.url) }
  60         currentSelection = selection
  61     }
  62 }