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import SwiftUI
struct FileImageView: NSViewRepresentable {
var image: NSImage?
let minimumSize: CGSize = CGSize(width: 350, height: 350)
let presentationPaddingRatio: Double = 0.5
func makeNSView(context: Context) -> NSImageView {
let imageView = NSImageView()
imageView.imageScaling = .scaleProportionallyUpOrDown
imageView.animates = true
imageView.isEditable = false
imageView.allowsCutCopyPaste = true
imageView.setContentCompressionResistancePriority(.defaultLow, for: .vertical)
imageView.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
if let img = self.image {
imageView.image = img
DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
self.resizeWindowForImageView(imageView)
}
}
return imageView
}
func updateNSView(_ nsView: NSImageView, context: Context) {
nsView.image = self.image
}
// MARK: -
func resizeWindowForImageView(_ imageView: NSImageView) {
guard let window = imageView.window, let img = imageView.image else {
return
}
var windowRect = window.contentLayoutRect
let windowChromeSize = CGSize(
width: window.frame.width - windowRect.width, height: window.frame.height - windowRect.height)
var windowMinSize: CGSize = windowRect.size
let centerPoint = CGPoint(x: window.frame.midX, y: window.frame.midY)
windowRect.size = img.size
if let screen = window.screen {
var paddedScreenSize = screen.frame.size
paddedScreenSize.width *= self.presentationPaddingRatio
paddedScreenSize.height *= self.presentationPaddingRatio
windowMinSize = aspectFit(source: windowRect.size, bounds: self.minimumSize)
windowRect.size = aspectFit(
source: windowRect.size, bounds: paddedScreenSize, minimum: windowMinSize)
}
windowRect.size.width += windowChromeSize.width
windowRect.size.height += windowChromeSize.height
windowRect.origin.x = centerPoint.x - windowRect.width / 2.0
windowRect.origin.y = centerPoint.y - windowRect.height / 2.0
window.setFrame(windowRect, display: true, animate: true)
// Do these APIs even work??
// window.aspectRatio = windowRect.size
// window.contentAspectRatio = windowRect.size
}
func aspectFit(
source sourceSize: CGSize, bounds boundingSize: CGSize, minimum minSize: CGSize? = nil
) -> CGSize {
let sourceAspectRatio = sourceSize.width / sourceSize.height
var fitSize: CGSize = sourceSize
if fitSize.width > boundingSize.width {
fitSize.width = boundingSize.width
fitSize.height = fitSize.width / sourceAspectRatio
}
if fitSize.height > boundingSize.height {
fitSize.height = boundingSize.height
fitSize.width = fitSize.height * sourceAspectRatio
}
if let m = minSize {
if fitSize.width < m.width {
fitSize.width = m.width
fitSize.height = fitSize.width / sourceAspectRatio
}
if fitSize.height < m.height {
fitSize.height = m.height
fitSize.width = fitSize.height * sourceAspectRatio
}
}
return fitSize
}
}
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