Chris@127: /* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
Chris@127: 
Chris@127: /*
Chris@127:     Sonic Visualiser
Chris@127:     An audio file viewer and annotation editor.
Chris@127:     Centre for Digital Music, Queen Mary, University of London.
Chris@127:     This file copyright 2006 Chris Cannam.
Chris@127:     
Chris@127:     This program is free software; you can redistribute it and/or
Chris@127:     modify it under the terms of the GNU General Public License as
Chris@127:     published by the Free Software Foundation; either version 2 of the
Chris@127:     License, or (at your option) any later version.  See the file
Chris@127:     COPYING included with this distribution for more information.
Chris@127: */
Chris@127: 
Chris@127: #ifndef _CANVAS_H_
Chris@127: #define _CANVAS_H_
Chris@127: 
Chris@127: #include <QFrame>
Chris@127: #include <QProgressBar>
Chris@127: 
Chris@127: #include "base/ZoomConstraint.h"
Chris@127: #include "base/PropertyContainer.h"
Chris@128: #include "ViewManager.h"
Chris@127: #include "base/XmlExportable.h"
Chris@127: 
Chris@127: // #define DEBUG_VIEW_WIDGET_PAINT 1
Chris@127: 
Chris@127: class Layer;
Chris@127: class ViewPropertyContainer;
Chris@127: 
Chris@127: #include <map>
Chris@127: 
Chris@127: /**
Chris@127:  * View is the base class of widgets that display one or more
Chris@127:  * overlaid views of data against a horizontal time scale. 
Chris@127:  *
Chris@127:  * A View may have any number of attached Layers, each of which
Chris@127:  * is expected to have one data Model (although multiple views may
Chris@127:  * share the same model).
Chris@127:  *
Chris@127:  * A View may be panned in time and zoomed, although the
Chris@127:  * mechanisms for doing so (as well as any other operations and
Chris@127:  * properties available) depend on the subclass.
Chris@127:  */
Chris@127: 
Chris@127: class View : public QFrame,
Chris@127: 	     public XmlExportable
Chris@127: {
Chris@127:     Q_OBJECT
Chris@127: 
Chris@127: public:
Chris@127:     /**
Chris@127:      * Deleting a View does not delete any of its layers.  They should
Chris@127:      * be managed elsewhere (e.g. by the Document).
Chris@127:      */
Chris@127:     virtual ~View();
Chris@127: 
Chris@127:     /**
Chris@127:      * Retrieve the first visible sample frame on the widget.
Chris@127:      * This is a calculated value based on the centre-frame, widget
Chris@127:      * width and zoom level.  The result may be negative.
Chris@127:      */
Chris@127:     virtual long getStartFrame() const;
Chris@127: 
Chris@127:     /**
Chris@127:      * Set the widget pan based on the given first visible frame.  The
Chris@127:      * frame value may be negative.
Chris@127:      */
Chris@127:     virtual void setStartFrame(long);
Chris@127: 
Chris@127:     /**
Chris@127:      * Return the centre frame of the visible widget.  This is an
Chris@127:      * exact value that does not depend on the zoom block size.  Other
Chris@127:      * frame values (start, end) are calculated from this based on the
Chris@127:      * zoom and other factors.
Chris@127:      */
Chris@127:     virtual size_t getCentreFrame() const { return m_centreFrame; }
Chris@127: 
Chris@127:     /**
Chris@127:      * Set the centre frame of the visible widget.
Chris@127:      */
Chris@127:     virtual void setCentreFrame(size_t f) { setCentreFrame(f, true); }
Chris@127: 
Chris@127:     /**
Chris@127:      * Retrieve the last visible sample frame on the widget.
Chris@127:      * This is a calculated value based on the centre-frame, widget
Chris@127:      * width and zoom level.
Chris@127:      */
Chris@127:     virtual size_t getEndFrame() const;
Chris@127: 
Chris@127:     /**
Chris@127:      * Return the pixel x-coordinate corresponding to a given sample
Chris@127:      * frame (which may be negative).
Chris@127:      */
Chris@127:     int getXForFrame(long frame) const;
Chris@127: 
Chris@127:     /**
Chris@127:      * Return the closest frame to the given pixel x-coordinate.
Chris@127:      */
Chris@127:     long getFrameForX(int x) const;
Chris@127: 
Chris@127:     /**
Chris@127:      * Return the pixel y-coordinate corresponding to a given
Chris@127:      * frequency, if the frequency range is as specified.  This does
Chris@127:      * not imply any policy about layer frequency ranges, but it might
Chris@127:      * be useful for layers to match theirs up if desired.
Chris@127:      *
Chris@127:      * Not thread-safe in logarithmic mode.  Call only from GUI thread.
Chris@127:      */
Chris@127:     float getYForFrequency(float frequency, float minFreq, float maxFreq, 
Chris@127: 			   bool logarithmic) const;
Chris@127: 
Chris@127:     /**
Chris@127:      * Return the closest frequency to the given pixel y-coordinate,
Chris@127:      * if the frequency range is as specified.
Chris@127:      *
Chris@127:      * Not thread-safe in logarithmic mode.  Call only from GUI thread.
Chris@127:      */
Chris@127:     float getFrequencyForY(int y, float minFreq, float maxFreq,
Chris@127: 			   bool logarithmic) const;
Chris@127: 
Chris@127:     /**
Chris@127:      * Return the zoom level, i.e. the number of frames per pixel
Chris@127:      */
Chris@127:     int getZoomLevel() const;
Chris@127: 
Chris@127:     /**
Chris@127:      * Set the zoom level, i.e. the number of frames per pixel.  The
Chris@127:      * centre frame will be unchanged; the start and end frames will
Chris@127:      * change.
Chris@127:      */
Chris@127:     virtual void setZoomLevel(size_t z);
Chris@127: 
Chris@127:     /**
Chris@127:      * Zoom in or out.
Chris@127:      */
Chris@127:     virtual void zoom(bool in);
Chris@127: 
Chris@127:     /**
Chris@127:      * Scroll left or right by a smallish or largish amount.
Chris@127:      */
Chris@127:     virtual void scroll(bool right, bool lots);
Chris@127: 
Chris@127:     virtual void addLayer(Layer *v);
Chris@127:     virtual void removeLayer(Layer *v); // does not delete the layer
Chris@127:     virtual int getLayerCount() const { return m_layers.size(); }
Chris@127: 
Chris@127:     /**
Chris@127:      * Return a layer, counted in stacking order.  That is, layer 0 is
Chris@127:      * the bottom layer and layer "getLayerCount()-1" is the top one.
Chris@127:      */
Chris@127:     virtual Layer *getLayer(int n) { return m_layers[n]; }
Chris@127: 
Chris@127:     /**
Chris@127:      * Return the layer last selected by the user.  This is normally
Chris@127:      * the top layer, the same as getLayer(getLayerCount()-1).
Chris@127:      * However, if the user has selected the pane itself more recently
Chris@127:      * than any of the layers on it, this function will return 0.  It
Chris@127:      * will also return 0 if there are no layers.
Chris@127:      */
Chris@127:     virtual Layer *getSelectedLayer();
Chris@127:     virtual const Layer *getSelectedLayer() const;
Chris@127: 
Chris@127:     virtual void setViewManager(ViewManager *m);
Chris@127:     virtual ViewManager *getViewManager() const { return m_manager; }
Chris@127: 
Chris@127:     virtual void setFollowGlobalPan(bool f);
Chris@127:     virtual bool getFollowGlobalPan() const { return m_followPan; }
Chris@127: 
Chris@127:     virtual void setFollowGlobalZoom(bool f);
Chris@127:     virtual bool getFollowGlobalZoom() const { return m_followZoom; }
Chris@127: 
Chris@127:     virtual void setLightBackground(bool lb) { m_lightBackground = lb; }
Chris@127:     virtual bool hasLightBackground() const { return m_lightBackground; }
Chris@127: 
Chris@127:     enum TextStyle {
Chris@127: 	BoxedText,
Chris@127: 	OutlinedText
Chris@127:     };
Chris@127: 
Chris@127:     virtual void drawVisibleText(QPainter &p, int x, int y,
Chris@127: 				 QString text, TextStyle style);
Chris@127: 
Chris@127:     virtual bool shouldIlluminateLocalFeatures(const Layer *, QPoint &) const {
Chris@127: 	return false;
Chris@127:     }
Chris@127:     virtual bool shouldIlluminateLocalSelection(QPoint &, bool &, bool &) const {
Chris@127: 	return false;
Chris@127:     }
Chris@127: 
Chris@127:     enum PlaybackFollowMode {
Chris@127: 	PlaybackScrollContinuous,
Chris@127: 	PlaybackScrollPage,
Chris@127: 	PlaybackIgnore
Chris@127:     };
Chris@127:     virtual void setPlaybackFollow(PlaybackFollowMode m);
Chris@127:     virtual PlaybackFollowMode getPlaybackFollow() const { return m_followPlay; }
Chris@127: 
Chris@127:     typedef PropertyContainer::PropertyName PropertyName;
Chris@127: 
Chris@127:     // We implement the PropertyContainer API, although we don't
Chris@127:     // actually subclass PropertyContainer.  We have our own
Chris@127:     // PropertyContainer that we can return on request that just
Chris@127:     // delegates back to us.
Chris@127:     virtual PropertyContainer::PropertyList getProperties() const;
Chris@127:     virtual QString getPropertyLabel(const PropertyName &) const;
Chris@127:     virtual PropertyContainer::PropertyType getPropertyType(const PropertyName &) const;
Chris@127:     virtual int getPropertyRangeAndValue(const PropertyName &,
Chris@127: 					 int *min, int *max) const;
Chris@127:     virtual QString getPropertyValueLabel(const PropertyName &,
Chris@127: 					  int value) const;
Chris@127:     virtual void setProperty(const PropertyName &, int value);
Chris@127:     virtual QString getPropertyContainerName() const {
Chris@127: 	return objectName();
Chris@127:     }
Chris@127:     virtual QString getPropertyContainerIconName() const = 0;
Chris@127: 
Chris@127:     virtual size_t getPropertyContainerCount() const;
Chris@127: 
Chris@127:     virtual const PropertyContainer *getPropertyContainer(size_t i) const;
Chris@127:     virtual PropertyContainer *getPropertyContainer(size_t i);
Chris@127: 
Chris@127:     virtual int getTextLabelHeight(const Layer *layer, QPainter &) const;
Chris@127: 
Chris@127:     virtual bool getValueExtents(QString unit, float &min, float &max,
Chris@127:                                  bool &log) const;
Chris@127: 
Chris@127:     virtual QString toXmlString(QString indent = "",
Chris@127: 				QString extraAttributes = "") const;
Chris@127: 
Chris@127:     size_t getModelsStartFrame() const;
Chris@127:     size_t getModelsEndFrame() const;
Chris@127: 
Chris@127: signals:
Chris@127:     void propertyContainerAdded(PropertyContainer *pc);
Chris@127:     void propertyContainerRemoved(PropertyContainer *pc);
Chris@127:     void propertyContainerPropertyChanged(PropertyContainer *pc);
Chris@127:     void propertyContainerNameChanged(PropertyContainer *pc);
Chris@127:     void propertyChanged(PropertyContainer::PropertyName);
Chris@127: 
Chris@127:     void centreFrameChanged(void *, unsigned long, bool);
Chris@127:     void zoomLevelChanged(void *, unsigned long, bool);
Chris@127: 
Chris@127: public slots:
Chris@127:     virtual void modelChanged();
Chris@127:     virtual void modelChanged(size_t startFrame, size_t endFrame);
Chris@127:     virtual void modelCompletionChanged();
Chris@127:     virtual void modelReplaced();
Chris@127:     virtual void layerParametersChanged();
Chris@127:     virtual void layerNameChanged();
Chris@127: 
Chris@127:     virtual void viewManagerCentreFrameChanged(void *, unsigned long, bool);
Chris@127:     virtual void viewManagerPlaybackFrameChanged(unsigned long);
Chris@127:     virtual void viewManagerZoomLevelChanged(void *, unsigned long, bool);
Chris@127: 
Chris@127:     virtual void propertyContainerSelected(View *, PropertyContainer *pc);
Chris@127: 
Chris@127:     virtual void selectionChanged();
Chris@127:     virtual void toolModeChanged();
Chris@133:     virtual void overlayModeChanged();
Chris@133:     virtual void zoomWheelsEnabledChanged();
Chris@127: 
Chris@127: protected:
Chris@127:     View(QWidget *, bool showProgress);
Chris@127:     virtual void paintEvent(QPaintEvent *e);
Chris@127:     virtual void drawSelections(QPainter &);
Chris@127:     virtual bool shouldLabelSelections() const { return true; }
Chris@127: 
Chris@127:     typedef std::vector<Layer *> LayerList;
Chris@127: 
Chris@127:     int getModelsSampleRate() const;
Chris@127:     bool areLayersScrollable() const;
Chris@127:     LayerList getScrollableBackLayers(bool testChanged, bool &changed) const;
Chris@127:     LayerList getNonScrollableFrontLayers(bool testChanged, bool &changed) const;
Chris@127:     size_t getZoomConstraintBlockSize(size_t blockSize,
Chris@127: 				      ZoomConstraint::RoundingDirection dir =
Chris@127: 				      ZoomConstraint::RoundNearest) const;
Chris@127: 
Chris@183:     // True if the top layer(s) use colours for meaningful things.  If
Chris@183:     // this is the case, selections will be shown using unfilled boxes
Chris@183:     // rather than with a translucent fill.
Chris@183:     bool areLayerColoursSignificant() const;
Chris@183: 
Chris@127:     bool setCentreFrame(size_t f, bool doEmit);
Chris@127: 
Chris@127:     void checkProgress(void *object);
Chris@127: 
Chris@127:     size_t              m_centreFrame;
Chris@127:     int                 m_zoomLevel;
Chris@127:     bool                m_followPan;
Chris@127:     bool                m_followZoom;
Chris@127:     PlaybackFollowMode  m_followPlay;
Chris@127:     size_t              m_playPointerFrame;
Chris@127:     bool                m_lightBackground;
Chris@127:     bool                m_showProgress;
Chris@127: 
Chris@127:     QPixmap            *m_cache;
Chris@127:     size_t              m_cacheCentreFrame;
Chris@127:     int                 m_cacheZoomLevel;
Chris@127:     bool                m_selectionCached;
Chris@127: 
Chris@127:     bool                m_deleting;
Chris@127: 
Chris@127:     LayerList           m_layers; // I don't own these, but see dtor note above
Chris@127:     bool                m_haveSelectedLayer;
Chris@127: 
Chris@127:     // caches for use in getScrollableBackLayers, getNonScrollableFrontLayers
Chris@127:     mutable LayerList m_lastScrollableBackLayers;
Chris@127:     mutable LayerList m_lastNonScrollableBackLayers;
Chris@127: 
Chris@127:     class LayerProgressBar : public QProgressBar {
Chris@127:     public:
Chris@127: 	LayerProgressBar(QWidget *parent);
Chris@127: 	virtual QString text() const { return m_text; }
Chris@127: 	virtual void setText(QString text) { m_text = text; }
Chris@127:     protected:
Chris@127: 	QString m_text;
Chris@127:     };
Chris@127: 
Chris@127:     typedef std::map<Layer *, LayerProgressBar *> ProgressMap;
Chris@127:     ProgressMap m_progressBars; // I own the ProgressBars
Chris@127: 
Chris@127:     ViewManager *m_manager; // I don't own this
Chris@127:     ViewPropertyContainer *m_propertyContainer; // I own this
Chris@127: };
Chris@127: 
Chris@127: 
Chris@127: // Use this for delegation, because we can't subclass from
Chris@127: // PropertyContainer (which is a QObject) ourselves because of
Chris@127: // ambiguity with QFrame parent
Chris@127: 
Chris@127: class ViewPropertyContainer : public PropertyContainer
Chris@127: {
Chris@127:     Q_OBJECT
Chris@127: 
Chris@127: public:
Chris@127:     ViewPropertyContainer(View *v);
Chris@127:     PropertyList getProperties() const { return m_v->getProperties(); }
Chris@127:     QString getPropertyLabel(const PropertyName &n) const {
Chris@127:         return m_v->getPropertyLabel(n);
Chris@127:     }
Chris@127:     PropertyType getPropertyType(const PropertyName &n) const {
Chris@127: 	return m_v->getPropertyType(n);
Chris@127:     }
Chris@127:     int getPropertyRangeAndValue(const PropertyName &n, int *min, int *max) const {
Chris@127: 	return m_v->getPropertyRangeAndValue(n, min, max);
Chris@127:     }
Chris@127:     QString getPropertyValueLabel(const PropertyName &n, int value) const {
Chris@127: 	return m_v->getPropertyValueLabel(n, value);
Chris@127:     }
Chris@127:     QString getPropertyContainerName() const {
Chris@127: 	return m_v->getPropertyContainerName();
Chris@127:     }
Chris@127:     QString getPropertyContainerIconName() const {
Chris@127: 	return m_v->getPropertyContainerIconName();
Chris@127:     }
Chris@127: 
Chris@127: public slots:
Chris@127:     virtual void setProperty(const PropertyName &n, int value) {
Chris@127: 	m_v->setProperty(n, value);
Chris@127:     }
Chris@127: 
Chris@127: protected:
Chris@127:     View *m_v;
Chris@127: };
Chris@127: 
Chris@127: #endif
Chris@127: