这是一个观察者设计模式的实现。
正如我们所看到的模型视图关系是间接的观察者设计模式为基础。
As we have seen, the Model-View relationship is an indirect one based on the Observer design pattern.
在设计控件与服务引擎时更加注重他们的独立性架构，充分利用观察者设计模式，使得项目具有灵活的扩展性。
Taking into account independence between modules for further extension, this project makes full use of the observation pattern in control and service engines design.
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