static let defaultPreviewImageHeight = 200.0

var isFullSize: Bool

required init?(coder: NSCoder) {

self.isFullSize = false

super.init(coder: coder)

self.wantsLayer = true

self.layer?.cornerRadius = 4.0

self.layer?.masksToBounds = true

self.layer?.borderColor = NSColor(white: 0.9, alpha: 1.0).cgColor

self.layer?.borderWidth = 1.0

}

override func draw(_ dirtyRect: NSRect) {

guard let image = self.image else {

return

}

let imageSize = image.size

var x, y, width, height: Double

if imageSize.width >= self.bounds.size.width {

width = Double(imageSize.width)

height = Double(imageSize.height)

} else {

width = Double(self.bounds.size.width)

height = (width/Double(imageSize.width)) * Double(imageSize.height)

}

x = (Double(self.bounds.size.width) - width) / 2

y = (type(of: self).defaultPreviewImageHeight - height) / 2

let imageRect = NSRect(x: x, y: y, width: width, height: height)

self.image?.draw(in: imageRect, from: NSRect.zero, operation: .destinationAtop, fraction: 1.0, respectFlipped: true, hints: nil)

}

override var intrinsicContentSize: NSSize {

get {

if (self.image != nil) || self.isFullSize {

return NSSize(width: Double(self.bounds.size.width), height: type(of: self).defaultPreviewImageHeight)

} else {

return NSSize.zero

}

}

}

override var image: NSImage? {

willSet {

newValue?.lockFocusFlipped(true)

}

}