Padding createPopupMenu() {
    return Padding(
      padding: const EdgeInsets.only(left: 16),
        child: PopupMenuButton<String>(
          child: Icon(Icons.menu),
          itemBuilder: (BuildContext context) {
            return StringsConst.popupItems.map((String item) {
              return PopupMenuItem<String>(
                value: item,
                child: Text(
                  item,
                  style: new TextStyle(
                    color: Colors.white,
                  ),
                ),
              );
            }).toList();
          },
        ),
    );
  }