这是qt4.2的所有类图，可以为qt开发者提供详细的参考-This is qt4.2 all the class diagram, qt developer can provide a detailed reference for

此文档为QT各个类之间的关系表示图，对于QT的理解及使用有一定的帮助-This document is the relationship between QT said each class diagram, for the understanding and use of QT be helpful