umbrix/macos/Runner/AppDelegate.swift

import Cocoa
import FlutterMacOS

@NSApplicationMain
class AppDelegate: FlutterAppDelegate {
  override func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool {
    // https://github.com/leanflutter/window_manager/issues/214
    return false
  }

  // window manager restore from dock: https://leanflutter.dev/blog/click-dock-icon-to-restore-after-closing-the-window
  override func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows flag: Bool) -> Bool {
      if !flag {
          for window in NSApp.windows {
              if !window.isVisible {
                  window.setIsVisible(true)
              }
              window.makeKeyAndOrderFront(self)
              NSApp.activate(ignoringOtherApps: true)
          }
      }
      return true
  }
}