swift-tests/SwiftTrayDemo/SwiftTrayDemoApp.swift

import SwiftUI
import AppKit
import ObjectiveC

enum WindowCommandCenter {
    static func mainWindow() -> NSWindow? {
        NSApp.windows.first { $0.identifier?.rawValue == "main-window" } ?? NSApp.windows.first
    }

    static func resizeMainWindow(width: Double, height: Double) {
        guard let window = mainWindow() else { return }
        var frame = window.frame
        frame.size = NSSize(width: width, height: height)
        window.setFrame(frame, display: true, animate: true)
        window.makeKeyAndOrderFront(nil)
    }

    static func centerMainWindow() {
        guard let window = mainWindow() else { return }
        window.center()
        NSApp.activate(ignoringOtherApps: true)
        window.makeKeyAndOrderFront(nil)
    }

    static func toggleFullScreen() {
        guard let window = mainWindow() else { return }
        NSApp.activate(ignoringOtherApps: true)
        window.toggleFullScreen(nil)
    }

    static func showMainWindow() {
        guard let window = mainWindow() else { return }
        NSApp.activate(ignoringOtherApps: true)
        window.makeKeyAndOrderFront(nil)
    }
}

final class WindowAccessor: NSView {
    var onResolve: ((NSWindow) -> Void)?

    override func viewDidMoveToWindow() {
        super.viewDidMoveToWindow()
        if let window {
            onResolve?(window)
        }
    }
}

struct MainWindowConfigurator: NSViewRepresentable {
    func makeNSView(context: Context) -> NSView {
        let view = WindowAccessor()
        view.onResolve = { window in
            window.identifier = NSUserInterfaceItemIdentifier("main-window")
            window.title = "Swift Window Demo"
            window.setContentSize(NSSize(width: 980, height: 640))
            window.center()
            window.styleMask.insert(.resizable)
            window.styleMask.insert(.miniaturizable)
            window.toolbarStyle = .unified
            window.titlebarAppearsTransparent = false
        }
        return view
    }

    func updateNSView(_ nsView: NSView, context: Context) {}
}

final class TrayController: NSObject {
    private var statusItem: NSStatusItem?

    func install() {
        let item = NSStatusBar.system.statusItem(withLength: NSStatusItem.variableLength)
        item.button?.image = NSImage(systemSymbolName: "menubar.rectangle", accessibilityDescription: "Swift Window Demo")
        item.button?.toolTip = "Swift Window Demo"

        let menu = NSMenu()

        let openItem = NSMenuItem(title: "Open Main Window", action: #selector(MenuActionBox.performAction), keyEquivalent: "o")
        openItem.target = MenuActionBox {
            WindowCommandCenter.showMainWindow()
        }
        menu.addItem(openItem)

        let centerItem = NSMenuItem(title: "Center Main Window", action: #selector(MenuActionBox.performAction), keyEquivalent: "c")
        centerItem.target = MenuActionBox {
            WindowCommandCenter.centerMainWindow()
        }
        menu.addItem(centerItem)

        menu.addItem(.separator())

        let quitItem = NSMenuItem(title: "Quit", action: #selector(MenuActionBox.performAction), keyEquivalent: "q")
        quitItem.target = MenuActionBox {
            NSApp.terminate(nil)
        }
        menu.addItem(quitItem)

        objc_setAssociatedObject(openItem, UnsafeRawPointer(bitPattern: 1)!, openItem.target, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        objc_setAssociatedObject(centerItem, UnsafeRawPointer(bitPattern: 2)!, centerItem.target, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        objc_setAssociatedObject(quitItem, UnsafeRawPointer(bitPattern: 3)!, quitItem.target, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)

        item.menu = menu
        statusItem = item
    }
}

final class MenuActionBox: NSObject {
    private let action: () -> Void

    init(action: @escaping () -> Void) {
        self.action = action
    }

    @objc func performAction() {
        action()
    }
}

final class AppDelegate: NSObject, NSApplicationDelegate {
    private let trayController = TrayController()

    func applicationDidFinishLaunching(_ notification: Notification) {
        trayController.install()
    }
}

struct InspectorView: View {
    var body: some View {
        VStack(alignment: .leading, spacing: 14) {
            Text("Utility Window")
                .font(.title2.bold())
            Text("This secondary scene proves the app supports more than one real macOS window.")
                .foregroundStyle(.secondary)
            Divider()
            Label("Independent scene", systemImage: "macwindow.on.rectangle")
            Label("Useful for inspectors, logs, or tools", systemImage: "sidebar.right")
        }
        .padding(20)
        .frame(minWidth: 360, minHeight: 220)
    }
}

@main
struct SwiftTrayDemoApp: App {
    @NSApplicationDelegateAdaptor(AppDelegate.self) private var appDelegate

    var body: some Scene {
        WindowGroup("Swift Window Demo") {
            ContentView()
                .background(MainWindowConfigurator())
        }
        .defaultSize(width: 980, height: 640)
        .commands {
            CommandGroup(after: .windowArrangement) {
                Button("Center Main Window") {
                    WindowCommandCenter.centerMainWindow()
                }
                .keyboardShortcut("0")
            }
        }

        Window("Inspector", id: "inspector") {
            InspectorView()
        }
        .defaultSize(width: 360, height: 220)
        .windowResizability(.contentSize)
    }
}