view base/ColourDatabase.h @ 335:02d2ad95ea52 spectrogram-cache-rejig

* Get storage advice for each cache in an FFT data server.  Allows us to be
  more confident about the actual memory situation and cut over from memory
  to disc part way through an FFT calculation if necessary.  StorageAdviser
  is now a bit too optimistic though (it's too keen to allocate large numbers
  of small blocks in memory).

/* -*- 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 2007 QMUL.
    
    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 _COLOUR_DATABASE_H_
#define _COLOUR_DATABASE_H_

#include <QObject>
#include <QString>
#include <QColor>
#include <QSize>
#include <QPixmap>
#include <vector>

class ColourDatabase : public QObject
{
    Q_OBJECT

public:
    static ColourDatabase *getInstance();

    int getColourCount() const;
    QString getColourName(int c) const;
    QColor getColour(int c) const;
    QColor getColour(QString name) const;
    int getColourIndex(QString name) const; // -1 -> not found
    int getColourIndex(QColor c) const; // returns first index of possibly many
    bool haveColour(QColor c) const;

    bool useDarkBackground(int c) const;
    void setUseDarkBackground(int c, bool dark);

    int addColour(QColor, QString); // returns index
    void removeColour(QString);

    // returned colour is not necessarily in database
    QColor getContrastingColour(int c) const;

    // for use in XML export
    void getStringValues(int index,
                         QString &colourName,
                         QString &colourSpec,
                         QString &darkbg) const;

    // for use in XML import
    int putStringValues(QString colourName,
                        QString colourSpec,
                        QString darkbg);

    // for use by PropertyContainer getPropertyRangeAndValue methods
    void getColourPropertyRange(int *min, int *max) const;

    QPixmap getExamplePixmap(int index, QSize size) const;
    
signals:
    void colourDatabaseChanged();

protected:
    ColourDatabase();

    struct ColourRec {
        QColor colour;
        QString name;
        bool darkbg;
    };
    
    typedef std::vector<ColourRec> ColourList;
    ColourList m_colours;

    static ColourDatabase m_instance;
};

#endif