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#ifndef BANDS_HPP__
#define BANDS_HPP__
#include <QAbstractTableModel>
#include "Radio.hpp"
//
// Class Bands
//
// Encapsulates information about amateur radio bands as defined by
// the ADIF specification. The model is immutable. The rows are
// stored in asscending order of frequency.
//
// Responsibilities
//
// Provides a well known band name mapped to lower and upper
// frequency limits. Also provides a convenience operation to
// determine the band name for any given frequency, the result of
// which may be null if the given frequency doesn't lie within a
// recognised band.
//
// Collaborations
//
// Implements the QAbstractTableModel interface as an immutable table
// where rows are bands and columns are band name, lower frequency
// limit and, upper ferquency limit respectively.
//
class Bands final
: public QAbstractTableModel
{
public:
using Frequency = Radio::Frequency;
// an iterator that meets the requirements of the C++ for range statement
class const_iterator
{
public:
const_iterator (int row)
: row_ {row}
{
}
QString operator * ();
bool operator != (const_iterator const&) const;
const_iterator& operator ++ ();
private:
int row_;
};
explicit Bands (QObject * parent = nullptr);
//
// Model API
//
QString find (Frequency) const; // find band Frequency is in
int find (QString const&) const; // find row of band (-1 if not valid)
bool findFreq(QString const& band, Radio::Frequency *pFreqLower, Radio::Frequency *pFreqHigher) const;
static QString const& oob ();
// Iterators
const_iterator begin () const;
const_iterator end () const;
// Custom role for sorting.
static int constexpr SortRole = Qt::UserRole;
// Implement the QAbstractTableModel interface
int rowCount (QModelIndex const& parent = QModelIndex {}) const override;
int columnCount (QModelIndex const& parent = QModelIndex {}) const override;
Qt::ItemFlags flags (QModelIndex const& = QModelIndex {}) const override;
QVariant headerData (int section, Qt::Orientation, int = Qt::DisplayRole) const override;
// The value return for the Qt::DisplayRole role for the root of the
// model (invalid index) is a special string representing out of
// band.
//
// All columns return a number for the custom role SortRole, this
// number defines a strict frequency order for the rows.
QVariant data (QModelIndex const&, int role = Qt::DisplayRole) const override;
};
#endif
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