尝试添加恢复上次尺寸大小

MainWidget.h

@@ -39,6 +39,10 @@ private:
     void judge_btn_page();
     void copy_key();
     void edit_property();
+
+protected:
+    void closeEvent(QCloseEvent* event);
+
 private:
     Element_t*        get_element_bykey(const QString& key);
     Element_t*        get_current_select_key();