public protocol Configuration {
    var titleBottomSpace: CGFloat                           { get }
    var titleFont: NSFont?                                  { get }
    var titleColor: NSColor                                 { get }
    var backgroundColor: NSColor                            { get }
    var cornerRadius: CGFloat                               { get }
    var hasShadow: Bool                                     { get }
    var appearsBelowSender: Bool                            { get }
    var presentingOffset: CGFloat                           { get }
    var animationDuration: TimeInterval                     { get }
    var contentEdgeInsets: NSEdgeInsets                     { get }
    var maximumContentHeight: CGFloat?                      { get }
    var separatorColor: NSColor                             { get }
    var separatorThickness: CGFloat                         { get }
    var separatorHorizontalPadding: Padding.Horizontal      { get }
    var separatorVerticlaPadding: Padding.Vertical          { get }
    var rememberSelection: Bool                             { get }
    var textAlignment: Alignment                            { get }
    var iconAlignment: Alignment                            { get }
    var menuItemFont: NSFont?                               { get }
    var menuItemHeight: CGFloat                             { get }
    var menuItemHoverBackgroundColor: NSColor               { get }
    var menuItemTextColor: NSColor                          { get }
    var menuItemHoverTextColor: NSColor                     { get }
    var menuItemCheckmarkColor: NSColor                     { get }
    var menuItemHoverCheckmarkColor: NSColor                { get }
    var menuItemCheckmarkHeight: CGFloat                    { get }
    var menuItemCheckmarkThikness: CGFloat                  { get }
    var menuItemHorizontalSpacing: CGFloat                  { get }
    var menuItemImageHeight: CGFloat?                       { get }
    var menuItemImageTintColor: NSColor?                    { get }
    var menuItemHoverImageTintColor: NSColor?               { get }
    var menuItemHoverAnimationDuration: TimeInterval        { get }
}

How to use

import Cocoa
import Menu

class ViewController: NSViewController {
    private let myMenu = Menu(with: "Select a search engine:")

    @IBOutlet var showMenuButton: NSButton!

    override func viewDidLoad() {
        super.viewDidLoad()

        let bing = MenuItem("Bing search", image: Icn.bing.image, action: { [weak self] in
            self?.showMenuButton.title = "Bing"
        })
        let item = MenuItem("DuckDuckGo search", image: Icn.duck.image, action: { [weak self] in
            self?.showMenuButton.title = "DuckDuckGo"
        })
        let google = MenuItem("Google search", image: Icn.google.image, action: { [weak self] in
            self?.showMenuButton.title = "Google"
        })
        let longText = MenuItem("Some very-very-very long text with no icon", action: { [weak self] in
            self?.showMenuButton.title = "Some very long text"
        })
        let emojiItem = MenuItem("Emojis are here 😎🚀", action: { [weak self] in
            self?.showMenuButton.title = "Emojis are here 😎🚀"
        })
        let exit = MenuItem("Exit", image: Icn.exit.image, action: {
            NSApplication.shared.terminate(nil)
        })
        let separator = MenuItem.separator()
        let menuItems = [
            bing,
            item,
            google,
            separator,
            longText,
            emojiItem,
            separator,
            exit
        ]

        myMenu.addItems(menuItems)
    }

    @IBAction func didClickButton(_ sender: NSButton) {
        myMenu.show(from: sender)
    }
}

Examples

In this section I've collected some examples of what can be i,plemented do using Menu control. On the left side some random example from Dribbble and on the right side my implementation.