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