diff document/Document.h @ 0:cd5d7ff8ef38

* Reorganising code base.  This revision will not compile.

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/document/Document.h	Mon Jul 31 12:03:45 2006 +0000
@@ -0,0 +1,295 @@
+/* -*- 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 _DOCUMENT_H_
+#define _DOCUMENT_H_
+
+#include "layer/LayerFactory.h"
+#include "transform/Transform.h"
+#include "base/Command.h"
+
+#include <map>
+#include <set>
+
+class Model;
+class Layer;
+class View;
+class WaveFileModel;
+
+/**
+ * A Sonic Visualiser document consists of a set of data models, and
+ * also the visualisation layers used to display them.  Changes to the
+ * layers and their layout need to be stored and managed in much the
+ * same way as changes to the underlying data.
+ * 
+ * The document manages:
+ * 
+ * -- A main data model, which provides the underlying sample rate and
+ * such like.  This must be a wave file model.
+ * 
+ * -- Any number of imported models, which contain data without any
+ * requirement to remember where the data came from or how to
+ * regenerate it.
+ * 
+ * -- Any number of models generated by transforms such as feature
+ * extraction plugins.  For these, we also record the source model and
+ * the name of the transform used to generate the model so that we can
+ * regenerate it (potentially from a different source) on demand.
+ *
+ * -- A flat list of layers.  Elsewhere, the GUI may distribute these
+ * across any number of view widgets.  A layer may be viewable on more
+ * than one view at once, in principle.  A layer refers to one model,
+ * but the same model can be in use in more than one layer.
+ *
+ * The document does *not* manage the existence or structure of Pane
+ * and other view widgets.  However, it does provide convenience
+ * methods for reference-counted command-based management of the
+ * association between layers and views (addLayerToView,
+ * removeLayerFromView).
+ */
+
+class Document : public QObject,
+		 public XmlExportable
+{
+    Q_OBJECT
+
+public:
+    Document();
+    virtual ~Document();
+
+    /**
+     * Create and return a new layer of the given type, associated
+     * with no model.  The caller may set any model on this layer, but
+     * the model must also be registered with the document via the
+     * add-model methods below.
+     */
+    Layer *createLayer(LayerFactory::LayerType);
+
+    /**
+     * Create and return a new layer of the given type, associated
+     * with the current main model (if appropriate to the layer type).
+     */
+    Layer *createMainModelLayer(LayerFactory::LayerType);
+
+    /**
+     * Create and return a new layer associated with the given model,
+     * and register the model as an imported model.
+     */
+    Layer *createImportedLayer(Model *);
+
+    /**
+     * Create and return a new layer of the given type, with an
+     * appropriate empty model.  If the given type is not one for
+     * which an empty model can meaningfully be created, return 0.
+     */
+    Layer *createEmptyLayer(LayerFactory::LayerType);
+
+    /**
+     * Create and return a new layer of the given type, associated
+     * with the given transform name.  This method does not run the
+     * transform itself, nor create a model.  The caller can safely
+     * add a model to the layer later, but note that all models used
+     * by a transform layer _must_ be registered with the document
+     * using addDerivedModel below.
+     */
+    Layer *createDerivedLayer(LayerFactory::LayerType, TransformName);
+
+    /**
+     * Create and return a suitable layer for the given transform,
+     * running the transform and associating the resulting model with
+     * the new layer.
+     */
+    Layer *createDerivedLayer(TransformName,
+                              Model *inputModel, 
+                              int inputChannel, // -1 -> all
+                              QString configurationXml);
+
+    /**
+     * Set the main model (the source for playback sample rate, etc)
+     * to the given wave file model.  This will regenerate any derived
+     * models that were based on the previous main model.
+     */
+    void setMainModel(WaveFileModel *);
+
+    /**
+     * Get the main model (the source for playback sample rate, etc).
+     */
+    WaveFileModel *getMainModel() { return m_mainModel; }
+
+    /**
+     * Add a derived model associated with the given transform name.
+     * This is necessary to register any derived model that was not
+     * created by the document using
+     * e.g. createDerivedLayer(TransformName) above.
+     */
+    void addDerivedModel(TransformName,
+                         Model *inputModel,
+                         int inputChannel, // -1 -> all
+                         Model *outputModelToAdd,
+                         QString configurationXml);
+
+    /**
+     * Add an imported (non-derived, non-main) model.  This is
+     * necessary to register any imported model that is associated
+     * with a layer.
+     */
+    void addImportedModel(Model *);
+
+    /**
+     * Associate the given model with the given layer.  The model must
+     * have already been registered using one of the addXXModel
+     * methods above.
+     */
+    void setModel(Layer *, Model *);
+
+    /**
+     * Set the given layer to use the given channel of its model (-1
+     * means all available channels).
+     */
+    void setChannel(Layer *, int);
+
+    /**
+     * Add the given layer to the given view.  If the layer is
+     * intended to show a particular model, the model should normally
+     * be set using setModel before this method is called.
+     */
+    void addLayerToView(View *, Layer *);
+
+    /**
+     * Remove the given layer from the given view.
+     */
+    void removeLayerFromView(View *, Layer *);
+
+    void toXml(QTextStream &, QString indent, QString extraAttributes) const;
+    QString toXmlString(QString indent, QString extraAttributes) const;
+
+signals:
+    void layerAdded(Layer *);
+    void layerRemoved(Layer *);
+    void layerAboutToBeDeleted(Layer *);
+
+    // Emitted when a layer is first added to a view, or when it is
+    // last removed from a view
+    void layerInAView(Layer *, bool);
+
+    void modelAdded(Model *);
+    void mainModelChanged(WaveFileModel *); // emitted after modelAdded
+    void modelAboutToBeDeleted(Model *);
+
+    void modelGenerationFailed(QString transformName);
+    void modelRegenerationFailed(QString layerName, QString transformName);
+
+protected:
+    Model *createModelForTransform(TransformName transform,
+                                   Model *inputModel,
+                                   int channel,
+                                   QString configurationXml);
+    void releaseModel(Model *model);
+
+    /**
+     * Delete the given layer, and also its associated model if no
+     * longer used by any other layer.  In general, this should be the
+     * only method used to delete layers -- doing so directly is a bit
+     * of a social gaffe.
+     */
+    void deleteLayer(Layer *, bool force = false);
+
+    /*
+     * Every model that is in use by a layer in the document must be
+     * found in either m_mainModel, m_derivedModels or
+     * m_importedModels.  We own and control the lifespan of all of
+     * these models.
+     */
+
+    /**
+     * The model that provides the underlying sample rate, etc.  This
+     * model is not reference counted for layers, and is not freed
+     * unless it is replaced or the document is deleted.
+     */
+    WaveFileModel *m_mainModel;
+
+    struct ModelRecord
+    {
+	// Information associated with a non-main model.  If this
+	// model is derived from another, then source will be non-NULL
+	// and the transform name will be set appropriately.  If the
+	// transform name is set but source is NULL, then there was a
+	// transform involved but the (target) model has been modified
+	// since being generated from it.
+	const Model *source;
+	TransformName transform;
+        int channel;
+        QString configurationXml;
+
+	// Count of the number of layers using this model.
+	int refcount;
+    };
+
+    typedef std::map<Model *, ModelRecord> ModelMap;
+    ModelMap m_models;
+
+    class AddLayerCommand : public Command
+    {
+    public:
+	AddLayerCommand(Document *d, View *view, Layer *layer);
+	virtual ~AddLayerCommand();
+	
+	virtual void execute();
+	virtual void unexecute();
+	virtual QString getName() const { return m_name; }
+
+    protected:
+	Document *m_d;
+	View *m_view; // I don't own this
+	Layer *m_layer; // Document owns this, but I determine its lifespans
+	QString m_name;
+	bool m_added;
+    };
+
+    class RemoveLayerCommand : public Command
+    {
+    public:
+	RemoveLayerCommand(Document *d, View *view, Layer *layer);
+	virtual ~RemoveLayerCommand();
+	
+	virtual void execute();
+	virtual void unexecute();
+	virtual QString getName() const { return m_name; }
+
+    protected:
+	Document *m_d;
+	View *m_view; // I don't own this
+	Layer *m_layer; // Document owns this, but I determine its lifespan
+	QString m_name;
+	bool m_added;
+    };
+
+    typedef std::map<Layer *, std::set<View *> > LayerViewMap;
+    LayerViewMap m_layerViewMap;
+
+    void addToLayerViewMap(Layer *, View *);
+    void removeFromLayerViewMap(Layer *, View *);
+
+    QString getUniqueLayerName(QString candidate);
+    
+    /**
+     * And these are the layers.  We also control the lifespans of
+     * these (usually through the commands used to add and remove them).
+     */
+    typedef std::set<Layer *> LayerSet;
+    LayerSet m_layers;
+};
+
+#endif