activated className createAction getAppModule getCommandID getGroup getMenuText getPixmap getStatusTip getToolTipText isActive languageChange

isActive() virtual bool isActive ( void  ) pure virtual 判断命令菜单项是否应处于高亮(可用)状态 返回 true 表示当前环境满足命令执行条件，菜单高亮；false 表示不满足，菜单置灰