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Copy pathDragView.swift
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DragView.swift
File metadata and controls
57 lines (45 loc) · 1.52 KB
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import Cocoa
protocol DragViewDelegate {
var acceptedFileExtensions: [String] { get }
func dragView(_ dragView: DragView, didDragFileWith fileURL: URL)
}
class DragView: NSView {
required init?(coder: NSCoder) {
super.init(coder: coder)
register(forDraggedTypes: [NSFilenamesPboardType, NSURLPboardType])
}
private var fileTypeIsOk = false
private var acceptedFileExtensions: [String] {
return delegate?.acceptedFileExtensions ?? []
}
var delegate: DragViewDelegate?
override func draggingEntered(_ sender: NSDraggingInfo) -> NSDragOperation {
if checkExtension(drag: sender) {
fileTypeIsOk = true
return .copy
} else {
fileTypeIsOk = false
return []
}
}
override func draggingUpdated(_ sender: NSDraggingInfo) -> NSDragOperation {
if fileTypeIsOk {
return .copy
} else {
return []
}
}
override func performDragOperation(_ sender: NSDraggingInfo) -> Bool {
guard let draggedFileURL = sender.draggedFileURL else {
return false
}
delegate?.dragView(self, didDragFileWith: draggedFileURL)
return true
}
func checkExtension(drag: NSDraggingInfo) -> Bool {
guard let fileExtension = drag.draggedFileURL?.pathExtension.lowercased() else {
return false
}
return acceptedFileExtensions.contains(fileExtension)
}
}