Implement initial NativeMacReceiverSelector

app/NativeMacReceiverSelector/AppDelegate.swift

@@ -0,0 +1,47 @@
+import Cocoa
+
+
+class AppDelegate: NSObject {
+    var mainWindow: NSWindow?
+    var mainWindowController: NSWindowController?
+    var mainWindowViewController: ViewController?
+}
+
+extension AppDelegate: NSApplicationDelegate {
+    func applicationDidFinishLaunching(_ aNotification: Notification) {
+        let window = NSPanel(
+                contentRect: NSZeroRect
+              , styleMask: [
+                    .titled
+                  , .closable
+                  , .hudWindow
+                  , .utilityWindow
+                  , .nonactivatingPanel
+                ]
+              , backing: .buffered
+              , defer: false)
+
+        window.title = "fx_cast"
+        window.orderFrontRegardless()
+        window.center()
+
+        let windowController = NSWindowController(window: window)
+        windowController.showWindow(window)
+
+        let viewController = ViewController()
+        window.contentViewController = viewController
+        window.makeKeyAndOrderFront(self)
+
+        self.mainWindow = window
+        self.mainWindowController = windowController
+        self.mainWindowViewController = viewController
+
+        NSApp.activate(ignoringOtherApps: true)
+    }
+
+    func applicationWillTerminate(_ aNotification: Notification) {}
+
+    func applicationShouldTerminateAfterLastWindowClosed(_ app: NSApplication) -> Bool {
+        return true
+    }
+}