Popupmenu Plan

SMBMenu.swift

import Cocoa

class SMBMenu: NSMenu {
    
    var button: NSStatusBarButton?
    
    required init(coder: NSCoder) {
        super.init(coder: coder)
    }
    
    override init(title: String) {
        super.init(title: title)
    }
    
    init(with button:NSStatusBarButton) {
        super.init(title: "")
        
        self.button = button
        
        let search = NSTextField()
        search.frame = NSMakeRect(0, 0, 180, 24)
        search.placeholderString = "Search..."
        let searchMenu = NSMenuItem()
        searchMenu.view = search
        
        self.addItem(searchMenu)
        self.addItem(.separator())
        self.addItem(NSMenuItem(title: "Item 1", action: #selector(AppDelegate.copyCode), keyEquivalent: ""))
        self.addItem(NSMenuItem(title: "Item 2", action: #selector(AppDelegate.copyCode), keyEquivalent: ""))
        self.addItem(NSMenuItem(title: "Item 3", action: #selector(AppDelegate.copyCode), keyEquivalent: ""))
        self.addItem(.separator())
        self.addItem(NSMenuItem(title: "Quit", action: #selector(AppDelegate.quit), keyEquivalent: ""))
        self.minimumWidth = 200
    }
    
    deinit {
        button?.highlight(false)
    }
}

statusbarbutton.swift

extension NSStatusBarButton {

    public override func mouseDown(with event: NSEvent) {
        
        NSApp.activate(ignoringOtherApps: true)
        
        self.highlight(true)
        let menu = SMBMenu(with: self) //pass in this instance so we can remove highlighting when this object is deinit
        
        DispatchQueue.main.async {
            menu.popUp(positioning: menu.item(at: 0), at:NSMakePoint(self.frame.minX, self.frame.maxY+4), in: self)
        }
    }
}