Solution for Ch33 Challenge: Show Filenames

Cocoa Programming for OS X (5th Edition) 33. Core Animation
1

Update addImagesFromFolderURL(_:slight_smile:

//  presentImage(thumbImage)
presentImage(thumbImage, withFilename: url.lastPathComponent!)

Update presentImage(_:slight_smile:

//  func presentImage(_ image: NSImage) {
func presentImage(_ image: NSImage, withFilename filename: String) {
  . . .
  let layer = CALayer()
  layer.contents = image
  layer.actions = ["position" : positionAnimation, "bounds" : boundsAnimation]
  
  // White Border for image
  layer.borderWidth = 5
  layer.borderColor = NSColor.white.cgColor
  
  // Shadow for image
  layer.shadowOpacity = 0.9               // Need a nonzero value
  layer.masksToBounds = false             // Allow shadow to be drawn outside bounds (false is default)
  layer.shadowColor = NSColor.lightGray.cgColor
  layer.shadowOffset = CGSize(width: 10, height: -10)   // Appears like with a light source at upper left
  
  // Show filename at lower left
  let textLayer = CATextLayer()
  textLayer.anchorPoint = CGPoint.zero
  textLayer.position = CGPoint(x: layer.borderWidth, y: layer.borderWidth)
  textLayer.zPosition = 100
  textLayer.fontSize = 15
  textLayer.backgroundColor = NSColor.white.cgColor
  textLayer.foregroundColor = NSColor.black.cgColor
  textLayer.string = filename
  let font = NSFont.systemFont(ofSize: textLayer.fontSize)
  let attributes = [NSFontAttributeName : font]
  var size = filename.size(withAttributes: attributes)
  size.width = ceil(size.width)
  size.height = ceil(size.height)
  textLayer.bounds = CGRect(origin: CGPoint.zero, size: size)
  layer.addSublayer(textLayer)