编写一个单文档应用程序，在窗口中建立一个和客户区大小相同的RichEdit编辑框，File里有新建保存打开退出，Edit里有撤销等，Style里有颜色和字体，还有默认，颜色里有红黄蓝绿黑，字体里有斜体加粗下划线。-Write a single document application, create a client area of ​ ​ the same size and RichEdit edit box in the window, File, there are n