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
  17     @IBOutlet var imageView: ImageView!
  18
  19     override var nibName: String! {
  20         return "ScreenshotDetailViewController"
  21     }
  22     override var contentRect: NSRect {
  23         return imageView.convert(imageView.imageRect, to: nil)
  24     }
  25
  26     private var currentSelection: [ScreenshotInformation] = []
  27
  28     override func viewDidLoad() {
  29         super.viewDidLoad()
  30
  31         arrayController.addObserver(self, forKeyPath: NSSelectionIndexesBinding, context: nil)
  32         updateSelections()
  33     }
  34
  35     override func observeValue(forKeyPath keyPath: String?,
  36                                of object: Any?,
  37                                change: [NSKeyValueChangeKey: Any]?,
  38                                context: UnsafeMutableRawPointer?) {
  39         if keyPath == NSSelectionIndexesBinding {
  40             updateSelections()
  41             return
  42         }
  43
  44         super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
  45     }
  46
  47     private func updateSelections() {
  48         guard let selection = arrayController.selectedObjects as? [ScreenshotInformation]
  49             else { return }
  50         if currentSelection == selection { return }
  51         imageView.images = selection.flatMap { NSImage(contentsOf: $0.url) }
  52         currentSelection = selection
  53     }
  54 }