shortcut-manager4.ts

  private checkPressedKeys(keyboardEvents: KeyboardEvent[], pressedKeysSize: number) {
    if (pressedKeysSize === 0) {
      // all keys have been released by "keyup" => inform subscribers
      return true;
    } else if (keyboardEvents.length === pressedKeysSize) {
      // check for the exactly count of pressed shortcut keys is important
      // also the sequence of the key presses is important => check the order
      const sorted = [...keyboardEvents]
        .sort((event1, event2) => (event1.timeStamp < event2.timeStamp ? -1 : 1))
        .map(event1 => event1.code)
        .join();
      return sorted === keyboardEvents.map(event => event.code).join();
    }
    return false;
  }