refs #196, encapsulated transponder mode selection (combo box)

* promoted QComboBox in GUI
* features automatic reset for ident
* Conversion to CTransponder::TransponderMode from string

src/blackgui/transpondermodeselector.h

@@ -0,0 +1,73 @@
+#ifndef BLACKGUI_QWITRANSPONDERMODESELECTOR_H
+#define BLACKGUI_QWITRANSPONDERMODESELECTOR_H
+
+#include "../blackmisc/aviotransponder.h"
+#include "blackmisc/aviotransponder.h"
+#include <QTimer>
+#include <QComboBox>
+#include <QStringList>
+
+
+namespace BlackGui
+{
+
+    /*!
+     * \brief Selector for the transponder mode
+     */
+    class CTransponderModeSelector : public QComboBox
+    {
+        Q_OBJECT
+
+    private:
+        BlackMisc::Aviation::CTransponder::TransponderMode m_currentMode;
+        BlackMisc::Aviation::CTransponder::TransponderMode m_resetMode;
+        QTimer m_resetTimer;
+
+    public:
+        //! \brief Constructor
+        explicit CTransponderModeSelector(QWidget *parent = nullptr);
+
+        //! \brief Standby string
+        static const QString &transponderStateStandby();
+
+        //! \brief Ident string
+        static const QString &transponderStateIdent();
+
+        //! \brief Mode C string
+        static const QString &transponderModeC();
+
+        //! \brief All relevant modes for GUI
+        static const QStringList &modes();
+
+        //! \brief Selected transponder mode
+        BlackMisc::Aviation::CTransponder::TransponderMode getSelectedTransponderMode() const;
+
+        //! \brief Selected transponder mode
+        void setSelectedTransponderMode(BlackMisc::Aviation::CTransponder::TransponderMode mode);
+
+        //!\ brief Set to ident
+        void setSelectedTransponderModeStateIdent()
+        {
+            this->setSelectedTransponderMode(BlackMisc::Aviation::CTransponder::StateIdent);
+        }
+
+        //! \brief Ident selected
+        bool isIdentSelected() const
+        {
+            return this->getSelectedTransponderMode() == BlackMisc::Aviation::CTransponder::StateIdent;
+        }
+
+    public slots:
+        //! \brief reset to last mode (unequal ident)
+        void resetTransponderMode();
+
+        //! \brief Selected transponder mode
+        void setSelectedTransponderModeAsString(const QString &mode);
+
+    signals:
+        //! \brief Ident ended
+        void identEnded();
+    };
+} // namespace
+
+#endif // guard