annotate layer/LayerFactory.h @ 959:2633a1d73e39

Address #1214, layer import produces wrong layer type. We needed a more principled approach to making sure the format gets updated properly and the dialog elements are consistent (basically separating making the dialog elements consistent from subsequently updating the format). This change should provide that, though there may be gotchas still.

/* -*- 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 _LAYER_FACTORY_H_
#define _LAYER_FACTORY_H_

#include <QString>
#include <set>

class Layer;
class Model;
class Clipboard;

class LayerFactory
{
public:
    enum LayerType {

	// Standard layers
	Waveform,
	Spectrogram,
	TimeRuler,
	TimeInstants,
	TimeValues,
	Notes,
	FlexiNotes,
	Regions,
	Text,
        Image,
	Colour3DPlot,
        Spectrum,
        Slice,

	// Layers with different initial parameters
	MelodicRangeSpectrogram,
	PeakFrequencySpectrogram,

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

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

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

    LayerType getLayerType(const Layer *);

    Layer *createLayer(LayerType type);

    void setLayerDefaultProperties(LayerType type, Layer *layer);

    QString getLayerPresentationName(LayerType type);

    bool isLayerSliceable(const Layer *);

    void setModel(Layer *layer, Model *model);
    Model *createEmptyModel(LayerType type, Model *baseModel);

    int getChannel(Layer *layer);
    void setChannel(Layer *layer, int channel);

    QString getLayerIconName(LayerType);
    QString getLayerTypeName(LayerType);
    LayerType getLayerTypeForName(QString);

    LayerType getLayerTypeForClipboardContents(const Clipboard &);

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);
	if (!model) return false;
	layer->setModel(model);
	return true;
    }

    static LayerFactory *m_instance;
};

#endif