增加通讯协议

pages/faultquery.h

@@ -17,6 +17,9 @@ public:
 
     void setReturnPage(PageId id) { m_returnPage = id; }
 
+protected:
+    void showEvent(QShowEvent* ev) override;   // 进入页面时默认聚焦“分页”
+
 private slots:
     void refresh();
     void onCategoryToggled(bool on);
@@ -25,6 +28,7 @@ private slots:
 private:
     FaultTable* m_table = nullptr;
     QLabel* m_title = nullptr;
+    QPushButton* m_back = nullptr;
     QVector<QPushButton*> m_categoryButtons;
     QVector<QString> m_categories;
     QString m_filter; // 空 = 全部