Query can be edited. Project database can be exported

User can now define the information to display in the nomenclature
table. WIP
The internal database of project can be exported to file.

sources/dataBase/ui/elementquerywidget.h

@@ -0,0 +1,64 @@
+/*
+   Copyright 2006-2020 The QElectroTech Team
+   This file is part of QElectroTech.
+
+   QElectroTech is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 2 of the License, or
+   (at your option) any later version.
+
+   QElectroTech is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef ELEMENTQUERYWIDGET_H
+#define ELEMENTQUERYWIDGET_H
+
+#include <QWidget>
+#include <QButtonGroup>
+
+class QListWidgetItem;
+
+namespace Ui {
+class ElementQueryWidget;
+}
+
+/**
+ * @brief The ElementQueryWidget class
+ * A widget use to edit a sql query for get element information
+ * This widget only work to get information from ProjectDataBase
+ */
+class ElementQueryWidget : public QWidget
+{
+    Q_OBJECT
+
+	public:
+		explicit ElementQueryWidget(QWidget *parent = nullptr);
+		~ElementQueryWidget();
+
+		QString queryStr() const;
+
+	private slots:
+		void on_m_up_pb_clicked();
+		void on_m_add_pb_clicked();
+		void on_m_remove_pb_clicked();
+		void on_m_down_pb_clicked();
+		void on_m_edit_sql_query_cb_clicked();
+
+		void updateQueryLine();
+		QStringList selectedKeys() const;
+		void setUpItems();
+
+	private:
+		Ui::ElementQueryWidget *ui;
+		QHash <QString, QString> m_export_info;
+		QButtonGroup m_button_group;
+		QList <QListWidgetItem *> m_items_list;
+		QString m_custom_query;
+};
+
+#endif // ELEMENTQUERYWIDGET_H