实现一个文本编辑器，具有方便的图形用户界面，包括标题栏、菜单栏，菜单栏有相关的菜单和菜单项，有快捷键，具有编辑、打开、保存、复制、粘贴等功能-The realization of a text editor with a convenient graphical user interface, including the title bar, menu bar, menu bar and associated menu item menu, and shortcut keys with edit