ScrollableMagRangeCache.h

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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 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 SCROLLABLE_MAG_RANGE_CACHE_H
#define SCROLLABLE_MAG_RANGE_CACHE_H

#include "base/BaseTypes.h"
#include "base/MagnitudeRange.h"

#include "LayerGeometryProvider.h"

class ScrollableMagRangeCache
{
public:
    ScrollableMagRangeCache() :
        m_startFrame(0)
    {}

    void invalidate() {
        m_ranges = std::vector<MagnitudeRange>(m_ranges.size());
    }
    
    int getWidth() const {
        return int(m_ranges.size());
    }

    void resize(int newWidth) {
        if (getWidth() != newWidth) {
            m_ranges = std::vector<MagnitudeRange>(newWidth);
        }
    }
        
    ZoomLevel getZoomLevel() const {
        return m_zoomLevel;
    }

    void setZoomLevel(ZoomLevel zoom) {
        using namespace std::rel_ops;
        if (m_zoomLevel != zoom) {
            m_zoomLevel = zoom;
            invalidate();
        }
    }

    sv_frame_t getStartFrame() const {
        return m_startFrame;
    }

    void setStartFrame(sv_frame_t frame) {
        if (m_startFrame != frame) {
            m_startFrame = frame;
            invalidate();
        }
    }

    bool isColumnSet(int column) const {
        return in_range_for(m_ranges, column) && m_ranges.at(column).isSet();
    }

    bool areColumnsSet(int x, int count) const {
        for (int i = 0; i < count; ++i) {
            if (!isColumnSet(x + i)) return false;
        }
        return true;
    }
    
    MagnitudeRange getRange(int column) const {
        return m_ranges.at(column);
    }

    MagnitudeRange getRange(int x, int count) const;
    
    void scrollTo(const LayerGeometryProvider *v, sv_frame_t newStartFrame);
    
    void sampleColumn(int column, const MagnitudeRange &r);
    
private:
    std::vector<MagnitudeRange> m_ranges;
    sv_frame_t m_startFrame;
    ZoomLevel m_zoomLevel;
};

#endif