import Foundation
@objc protocol SelectionItem:NSObjectProtocol {
    var time:Double {get set }
}

class Selection: NSObject {
    var contents = [SelectionItem]()
    
    convenience init(initialContents:[SelectionItem]) {
        self.init()
        contents = initialContents
    }
    
    func offsetKeyframes(_ offset:Double) {
        for i in 0..<contents.count {
            contents[i].time += offset
        }
    }
}