linux qt4实现字幕滚动显示功能，循环滚动。-linux qt4 subtitles scroll display function, rolling cycle.

本内容基于VC++的文本编辑，主要包括创建图形插入符、添加字符串资源、路径、以及字幕变色等功能的实现。-The is based VC++ text editor, includes creating graphics caret, add a string resource, the function of the realization of the path, as well as subtitles discoloration.