import 'dart:ui';
import 'package:flutter/foundation.dart';
import 'package:flutter/services.dart';
import 'package:flutter/material.dart';

/// [key] with Cmd on Apple platforms and Ctrl elsewhere.
SingleActivator primaryShortcut(LogicalKeyboardKey key, {bool shift = false}) {
  final apple = defaultTargetPlatform == TargetPlatform.macOS ||
      defaultTargetPlatform == TargetPlatform.iOS;
  return SingleActivator(key, control: !apple, meta: apple, shift: shift);
}

/// Phones with a D-pad move focus between screen areas with the arrow keys,
/// so the soft keyboard closes while browsing.
bool get dpadNavigation =>
    defaultTargetPlatform == TargetPlatform.android ||
    defaultTargetPlatform == TargetPlatform.iOS;

/// Opens the popup menu behind [key] with its first item focused, so the
/// D-pad can move through it.
void openMenuWithFocus(GlobalKey<PopupMenuButtonState<String>> key) {
  key.currentState?.showButtonMenu();
  // The menu takes focus in a microtask after its first frame, so wait for that.
  WidgetsBinding.instance.addPostFrameCallback((_) =>
      Future(() => FocusManager.instance.primaryFocus?.nextFocus()));
}

final quitShortcut = primaryShortcut(LogicalKeyboardKey.keyQ);

Future<void> quitApp() =>
    ServicesBinding.instance.exitApplication(AppExitType.required);