SubForm 0 0 540 235 Form 0 9 订阅主题: topicLineEdit QOS0 QOS1 QOS2 Qos: qosComboBox 订阅主题类: 订阅 取消订阅 Qt::Vertical 20 40 topicLineEdit qosComboBox subButton unsubButton listWidget topicLineEdit textChanged(QString) SubForm onTopicInput(QString) 129 42 268 0 subButton clicked() SubForm onSubscribe() 449 32 395 47 unsubButton clicked() SubForm onUnsubscribe() 470 62 396 99 onSubscribe() onUnsubscribe() onTopicInput(QString)