Add user properties class

Add a specific class for user properties instead of embedded user
properties in properties interface.

sources/properties/userproperties.h

@@ -0,0 +1,59 @@
+/*
+		Copyright 2006-2021 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 USERPROPERTIES_H
+#define USERPROPERTIES_H
+
+#include "propertiesinterface.h"
+
+/**
+ * @brief The UserProperties class
+ * This class store user properties.
+ * User properties are properties set by user
+ * who are don't know by QElectroTech.
+ * An user property is defined by a name and a value
+ * of arbitrarie type (QString, char*, int, double, bool, QUuid, QColor)
+ */
+class UserProperties : public PropertiesInterface
+{
+	public:
+		UserProperties(const QString tag_name = "userProperties");
+
+		virtual void toSettings (QSettings &,
+								 const QString = QString()) const override {}
+
+		virtual void fromSettings (const QSettings &,
+								   const QString = QString()) override {}
+
+		virtual QDomElement toXml (QDomDocument &xml_document) const override;
+		virtual bool fromXml (const QDomElement &xml_element) override;
+
+		void deleteUserProperties();
+		int userPropertiesCount() const;
+		void setUserProperty(const QString& key, const QVariant& value);
+		bool existUserProperty(const QString& key) const;
+		QVariant userPropertyValue(const QString& key);
+
+		void setTagName(const QString& tag_name);
+		QString tagName() const;
+
+	private:
+		QHash<QString, QVariant> m_properties;
+		QString m_tag_name;
+};
+
+#endif // USERPROPERTIES_H