view layer/LayerFactory.h @ 1:ab83c415a6cd

* Backed out partially complete changes to make the spectrogram only
store results up to the requested max frequency.  The speed improvement
was minimal at the expense of annoyance when changing frequency limit,
and although it did save memory, it wasn't yet reliable and fixing it
is not a high enough priority.

/* -*- c-basic-offset: 4 -*-  vi:set ts=8 sts=4 sw=4: */

/*
    A waveform viewer and audio annotation editor.
    Chris Cannam, Queen Mary University of London, 2005
    
    This is experimental software.  Not for distribution.
*/

#ifndef _LAYER_FACTORY_H_
#define _LAYER_FACTORY_H_

#include <QString>
#include <set>

class Layer;
class View;
class Model;

class LayerFactory
{
public:
    enum LayerType {

	// Standard layers
	Waveform,
	Spectrogram,
	TimeRuler,
	TimeInstants,
	TimeValues,
	Colour3DPlot,

	// Layers with different initial parameters
	MelodicRangeSpectrogram,

	// Not-a-layer-type
	UnknownLayer = 255
    };

    static LayerFactory *instance();
    
    virtual ~LayerFactory();

    typedef std::set<LayerType> LayerTypeSet;
    LayerTypeSet getValidLayerTypes(Model *model);

    LayerType getLayerType(Layer *);

    Layer *createLayer(LayerType type, View *view,
		       Model *model = 0, int channel = -1);

    QString getLayerPresentationName(LayerType type);

    void setModel(Layer *layer, Model *model);

protected:
    template <typename LayerClass, typename ModelClass>
    bool trySetModel(Layer *layerBase, Model *modelBase) {
	LayerClass *layer = dynamic_cast<LayerClass *>(layerBase);
	if (!layer) return false;
	ModelClass *model = dynamic_cast<ModelClass *>(modelBase);
	layer->setModel(model);
	return true;
    }

    static LayerFactory *m_instance;
};

#endif