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使用了自定义的events 和 transitions
是并行状态，可以各自独立地进行转换。
The pinger state will post the first ping event upon entry; the ponger state will respond by posting a pong event; this will cause the pinger state to post a new ping event;
PingTransition class defines a transition that is triggered by PingEvent
PongTransition class defines a transition that is triggered by PongEvent，不过代码好像写错了
pinger->addTransition(new PongTransition);//转换是无目标的,当触发这样的转换时，源状态不会退出并重新进入,仅调用转换的 onTransition() 函数
Qt官方示例解析系列11:状态机Ping Pong States
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