Chris@0: 
Chris@0: /* -*- c-basic-offset: 4 -*-  vi:set ts=8 sts=4 sw=4: */
Chris@0: 
Chris@0: /*
Chris@0:     A waveform viewer and audio annotation editor.
Chris@0:     Chris Cannam, Queen Mary University of London, 2005
Chris@0:     
Chris@0:     This is experimental software.  Not for distribution.
Chris@0: */
Chris@0: 
Chris@0: #ifndef _VIEWER_H_
Chris@0: #define _VIEWER_H_
Chris@0: 
Chris@0: #include "PropertyContainer.h"
Chris@0: 
Chris@0: #include <QObject>
Chris@0: #include <QRect>
Chris@0: 
Chris@0: class ZoomConstraint;
Chris@0: class Model;
Chris@0: class QPainter;
Chris@0: class View;
Chris@0: 
Chris@0: /**
Chris@0:  * The base class for visual representations of the data found in a
Chris@0:  * Model.  Layers are expected to be able to draw themselves onto a
Chris@0:  * View, and may also be editable.
Chris@0:  */
Chris@0: 
Chris@0: class Layer : public QObject,
Chris@0: 	      public PropertyContainer
Chris@0: {
Chris@0:     Q_OBJECT
Chris@0: 
Chris@0: public:
Chris@0:     Layer(View *w);
Chris@0:     virtual ~Layer();
Chris@0: 
Chris@0:     virtual const Model *getModel() const = 0;
Chris@0:     virtual const ZoomConstraint *getZoomConstraint() const { return 0; }
Chris@0:     virtual void paint(QPainter &, QRect) const = 0;   
Chris@0: 
Chris@0:     enum VerticalPosition {
Chris@0: 	PositionTop, PositionMiddle, PositionBottom
Chris@0:     };
Chris@0:     virtual VerticalPosition getPreferredTimeRulerPosition() const {
Chris@0: 	return PositionMiddle;
Chris@0:     }
Chris@0:     virtual VerticalPosition getPreferredFrameCountPosition() const {
Chris@0: 	return PositionBottom;
Chris@0:     }
Chris@0: 
Chris@0:     virtual QString getPropertyContainerName() const {
Chris@0: 	return objectName();
Chris@0:     }
Chris@0: 
Chris@0:     virtual int getVerticalScaleWidth(QPainter &) const { return 0; }
Chris@0:     virtual void paintVerticalScale(QPainter &, QRect) const { }
Chris@0: 
Chris@0:     virtual QRect getFeatureDescriptionRect(QPainter &, QPoint) const {
Chris@0: 	return QRect(0, 0, 0, 0);
Chris@0:     }
Chris@0:     virtual void paintLocalFeatureDescription(QPainter &, QRect, QPoint) const {
Chris@0:     }
Chris@0: 
Chris@0:     /**
Chris@0:      * This should return true if the view can safely be scrolled
Chris@0:      * automatically by the widget (simply copying the existing data
Chris@0:      * and then refreshing the exposed area) without altering its
Chris@0:      * meaning.  For the widget as a whole this is usually not
Chris@0:      * possible because of invariant (non-scrolling) material
Chris@0:      * displayed over the top, but the widget may be able to optimise
Chris@0:      * scrolling better if it is known that individual views can be
Chris@0:      * scrolled safely in this way.
Chris@0:      */
Chris@0:     virtual bool isLayerScrollable() const { return true; }
Chris@0: 
Chris@0:     /**
Chris@0:      * Return the proportion of background work complete in drawing
Chris@0:      * this view, as a percentage -- in most cases this will be the
Chris@0:      * value returned by pointer from a call to the underlying model's
Chris@0:      * isReady(int *) call.  The widget may choose to show a progress
Chris@0:      * meter if it finds that this returns < 100 at any given moment.
Chris@0:      */
Chris@0:     virtual int getCompletion() const { return 100; }
Chris@0: 
Chris@0:     virtual void setObjectName(const QString &name);
Chris@0: 
Chris@0: signals:
Chris@0:     void modelChanged();
Chris@0:     void modelCompletionChanged();
Chris@0:     void modelChanged(size_t startFrame, size_t endFrame);
Chris@0:     void modelReplaced();
Chris@0: 
Chris@0:     void layerParametersChanged();
Chris@0:     void layerNameChanged();
Chris@0: 
Chris@0: protected:
Chris@0:     View *m_view;
Chris@0: };
Chris@0: 
Chris@0: #endif
Chris@0: