attachSelection blockSelection detachSelection ISelectionObserver isSelectionAttached isSelectionBlocked onSelectionChanged ~ISelectionObserver

onSelectionChanged() virtual void onSelectionChanged ( const ISelectionChanges &  msg ) pure virtual 发布-订阅消息接收回调函数 发布-订阅消息接收回调函数 参数 [msg] 待处理消息