62 lines
2.9 KiB
Swift
62 lines
2.9 KiB
Swift
import QuickLookThumbnailing
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import ZIPFoundation
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import Cocoa
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class ThumbnailProvider: QLThumbnailProvider {
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override func provideThumbnail(for request: QLFileThumbnailRequest, _ handler: @escaping (QLThumbnailReply?, Error?) -> Void) {
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let fc: NSFileCoordinator = NSFileCoordinator()
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let intent: NSFileAccessIntent = NSFileAccessIntent.readingIntent(with: request.fileURL)
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fc.coordinate(with: [intent], queue: .main) { (err) in
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if err == nil {
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do {
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let archive = Archive(data: try Data(contentsOf: intent.url), accessMode: Archive.AccessMode.read)
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let entry = archive?["QuickLook/Thumbnail.png"]
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var top_data = Data()
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try archive?.extract(entry!, consumer: { (d) in
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top_data.append(d)
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})
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let image = NSImage(data: top_data)
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let maximumSize = request.maximumSize
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let imageSize = image?.size
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var newImageSize = maximumSize
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var contextSize = maximumSize
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let aspectRatio = imageSize!.height / imageSize!.width
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let proposedHeight = aspectRatio * maximumSize.width
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if proposedHeight <= maximumSize.height {
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newImageSize.height = proposedHeight
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contextSize.height = max(proposedHeight.rounded(.down), request.minimumSize.height)
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} else {
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newImageSize.width = maximumSize.height / aspectRatio
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contextSize.width = max(newImageSize.width.rounded(.down), request.minimumSize.width)
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}
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let reply: QLThumbnailReply = QLThumbnailReply.init(contextSize: contextSize) { () -> Bool in
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if image != nil {
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image!.draw(in: CGRect(x: contextSize.width/2 - newImageSize.width/2,
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y: contextSize.height/2 - newImageSize.height/2,
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width: newImageSize.width,
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height: newImageSize.height));
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return true
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} else {
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return false
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}
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}
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handler(reply, nil)
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} catch {
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NSLog("Could not load file \(intent.url.lastPathComponent) to preview it")
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handler(nil, nil)
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}
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} else {
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NSLog("Could not find file \(intent.url.lastPathComponent) to preview it")
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handler(nil, nil)
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}
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}
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}
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}
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