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 class ScreenshotDetailViewController: BridgeViewController {
  12     deinit {
  13         arrayController.removeObserver(self, forKeyPath: NSSelectionIndexesBinding)
  14     }
  15
  16     @IBOutlet var imageView: ImageView!
  17
  18     override var nibName: String! {
  19         return "ScreenshotDetailViewController"
  20     }
  21     override var contentRect: NSRect {
  22         return imageView.convert(imageView.imageRect, to: nil)
  23     }
  24
  25     private var currentSelection: [ScreenshotInformation] = []
  26
  27     override func viewDidLoad() {
  28         super.viewDidLoad()
  29
  30         arrayController.addObserver(self, forKeyPath: NSSelectionIndexesBinding, context: nil)
  31         updateSelections()
  32     }
  33
  34     override func observeValue(forKeyPath keyPath: String?,
  35                                of object: Any?,
  36                                change: [NSKeyValueChangeKey: Any]?,
  37                                context: UnsafeMutableRawPointer?) {
  38         if keyPath == NSSelectionIndexesBinding {
  39             updateSelections()
  40             return
  41         }
  42
  43         super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
  44     }
  45
  46     private func updateSelections() {
  47         guard let selection = arrayController.selectedObjects as? [ScreenshotInformation]
  48             else { return }
  49         if currentSelection == selection { return }
  50         imageView.images = selection.flatMap { NSImage(contentsOf: $0.url) }
  51         currentSelection = selection
  52     }
  53 }