initial creation of custom formatters (#91)

sources/awesome-widget/plugin/awformatterhelper.h

@@ -0,0 +1,49 @@
+/***************************************************************************
+ *   This file is part of awesome-widgets                                  *
+ *                                                                         *
+ *   awesome-widgets 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 3 of the    *
+ *   License, or (at your option) any later version.                       *
+ *                                                                         *
+ *   awesome-widgets 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 awesome-widgets. If not, see http://www.gnu.org/licenses/  *
+ ***************************************************************************/
+
+
+#ifndef AWFORMATTERHELPER_H
+#define AWFORMATTERHELPER_H
+
+#include <QObject>
+
+#include "awabstractformatter.h"
+
+
+class AWFormatterHelper : public QObject
+{
+    Q_OBJECT
+
+public:
+    enum class FormatterClass { Float, DateTime, NoFormat };
+
+    explicit AWFormatterHelper(QObject *parent = nullptr);
+    virtual ~AWFormatterHelper();
+    QString convert(const QVariant &value, const QString name) const;
+    QStringList definedFormatters() const;
+
+private:
+    AWFormatterHelper::FormatterClass
+    defineFormatterClass(const QString name) const;
+    void init();
+    // properties
+    QString m_genericConfig;
+    QHash<QString, AWAbstractFormatter *> m_formatters;
+};
+
+
+#endif /* AWFORMATTERHELPER_H */