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/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*- vi:set ts=8 sts=4 sw=4: */
/*
Sonic Visualiser
An audio file viewer and annotation editor.
Centre for Digital Music, Queen Mary, University of London.
This file copyright 2006 Chris Cannam.
This program 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. See the file
COPYING included with this distribution for more information.
*/
#ifndef SV_UNIT_DATABASE_H
#define SV_UNIT_DATABASE_H
#include <QObject>
#include <QString>
#include <QStringList>
#include <map>
// This grandly named class is just a list of the names of known scale
// units for the various models, for use as the set of fixed values in
// unit dropdown menus etc. Of course, the user should be allowed to
// enter their own as well.
namespace sv {
class UnitDatabase : public QObject
{
Q_OBJECT
public:
static UnitDatabase *getInstance();
QStringList getKnownUnits() const;
void registerUnit(QString unit);
/**
* Return the reference id for a given unit name. If registerNew is
* true and the unit is not known, register it and return its new
* id. If register is false and the unit is not known, return -1.
*/
int getUnitId(QString unit, bool registerNew = true);
QString getUnitById(int id);
enum class Quantity {
Power,
RootPower,
Other
};
/**
* Return whether a unit is that of a power quantity, a root-power
* quantity (such as voltage), or is not known to be either. This
* affects dB value calculations.
*/
static Quantity getUnitQuantity(QString unit);
/**
* If a unit is some form of one of the small set of common units
* "Hz", "V", "dB", or "s", return the matching one. For example,
* given "volts" return "V". If the unit is not recognised as one
* of these, return QString().
*/
static QString asCommonUnit(QString unit);
signals:
void unitDatabaseChanged();
protected:
UnitDatabase();
typedef std::map<QString, int> UnitMap;
UnitMap m_units;
int m_nextId;
static UnitDatabase m_instance;
};
} // end namespace sv
#endif
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