thetheaerezs

代码说明：

  GEF 图形编辑框架,是Eclipse旗下一个重要的插件,用于开发图形界面,这是系列教程源码之8-3,(GEF Graphics Editing Framework, an important plug-in of Eclipse, is used to develop graphical interface, which is one of the source code 8-3 of the series of tutorials.)