LayerGeometryProvider.h

Go to the documentation of this file.

/* -*- 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 SV_LAYER_GEOMETRY_PROVIDER_H
#define SV_LAYER_GEOMETRY_PROVIDER_H

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

#include <QMutex>
#include <QMutexLocker>
#include <QPainter>

class ViewManager;
class View;
class Layer;

class LayerGeometryProvider
{
protected:
    static int getNextId() {
        static QMutex idMutex;
        static int nextId = 1;
        static int maxId = INT_MAX;
        QMutexLocker locker(&idMutex);
        int id = nextId;
        if (nextId == maxId) {
            // we don't expect this to happen in the lifetime of a
            // process, but it would be undefined behaviour if it did
            // since we're using a signed int, so we should really
            // guard for it...
            nextId = 1;
        } else {
            nextId++;
        }
        return id;
    }            
    
public:
    LayerGeometryProvider() { }
    
    virtual int getId() const = 0;

    virtual sv_frame_t getStartFrame() const = 0;

    virtual sv_frame_t getCentreFrame() const = 0;

    virtual sv_frame_t getEndFrame() const = 0;

    virtual int getXForFrame(sv_frame_t frame) const = 0;

    virtual sv_frame_t getFrameForX(int x) const = 0;

    virtual sv_frame_t getModelsStartFrame() const = 0;
    virtual sv_frame_t getModelsEndFrame() const = 0;

    virtual int getXForViewX(int viewx) const = 0;
    
    virtual int getViewXForX(int x) const = 0;
    
    virtual double getYForFrequency(double frequency,
                                    double minFreq, double maxFreq, 
                                    bool logarithmic) const = 0;

    virtual double getFrequencyForY(double y,
                                    double minFreq, double maxFreq,
                                    bool logarithmic) const = 0;

    virtual int getTextLabelYCoord(const Layer *layer, QPainter &) const = 0;

    virtual bool getVisibleExtentsForUnit(QString unit,
                                          double &min, double &max,
                                          bool &log) const = 0;

    virtual ZoomLevel getZoomLevel() const = 0;

    virtual QRect getPaintRect() const = 0;

    virtual QSize getPaintSize() const { return getPaintRect().size(); }
    virtual int getPaintWidth() const { return getPaintRect().width(); }
    virtual int getPaintHeight() const { return getPaintRect().height(); }

    virtual bool hasLightBackground() const = 0;
    virtual QColor getForeground() const = 0;
    virtual QColor getBackground() const = 0;

    virtual ViewManager *getViewManager() const = 0;

    virtual bool shouldIlluminateLocalFeatures(const Layer *, QPoint &) const = 0;
    virtual bool shouldShowFeatureLabels() const = 0;

    virtual void drawMeasurementRect(QPainter &p, const Layer *,
                                     QRect rect, bool focus) const = 0;

    virtual void updatePaintRect(QRect r) = 0;

    virtual double scaleSize(double size) const = 0;
    virtual int scalePixelSize(int size) const = 0;
    virtual double scalePenWidth(double width) const = 0;
    virtual QPen scalePen(QPen pen) const = 0;
    
    virtual View *getView() = 0;
    virtual const View *getView() const = 0;
};

#endif