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// -*- c-basic-offset: 4 -*-
/*
Rosegarden
A sequencer and musical notation editor.
This program is Copyright 2000-2008
Guillaume Laurent <glaurent@telegraph-road.org>,
Chris Cannam <cannam@all-day-breakfast.com>,
Richard Bown <bownie@bownie.com>
The moral right of the authors to claim authorship of this work
has been asserted.
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 _VIEWELEMENT_H_
#define _VIEWELEMENT_H_
#include "Event.h"
#include <set>
#include <list>
namespace Rosegarden
{
/**
* The abstract base for classes which represent an Event as an
* on-screen graphic item (a note, a rectangle on a piano roll).
*/
class ViewElement
{
friend class ViewElementList;
friend class Staff;
public:
virtual ~ViewElement();
const Event* event() const { return m_event; }
Event* event() { return m_event; }
virtual timeT getViewAbsoluteTime() const { return event()->getAbsoluteTime(); }
virtual timeT getViewDuration() const { return event()->getDuration(); }
/**
* Returns the X coordinate of the element, as computed by the
* tqlayout. This is not the coordinate of the associated canvas
* item.
*
* @see getCanvasX()
*/
virtual double getLayoutX() const { return m_tqlayoutX; }
/**
* Returns the Y coordinate of the element, as computed by the
* tqlayout. This is not the coordinate of the associated canvas
* item.
*
* @see getCanvasY()
*/
virtual double getLayoutY() const { return m_tqlayoutY; }
/**
* Sets the X coordinate which was computed by the tqlayout engine
* @see getLayoutX()
*/
virtual void setLayoutX(double x) { m_tqlayoutX = x; }
/**
* Sets the Y coordinate which was computed by the tqlayout engine
* @see getLayoutY()
*/
virtual void setLayoutY(double y) { m_tqlayoutY = y; }
void dump(std::ostream&) const;
friend bool operator<(const ViewElement&, const ViewElement&);
protected:
ViewElement(Event *);
double m_tqlayoutX;
double m_tqlayoutY;
Event *m_event;
};
class ViewElementComparator
{
public:
bool operator()(const ViewElement *e1, const ViewElement *e2) const {
return *e1 < *e2;
}
};
/**
* This class owns the objects its items are pointing at.
*
* The template argument T must be a subclass of ViewElement.
*/
class ViewElementList : public std::multiset<ViewElement *, ViewElementComparator >
{
typedef std::multiset<ViewElement *, ViewElementComparator > set_type;
public:
typedef set_type::iterator iterator;
ViewElementList() : set_type() { }
virtual ~ViewElementList();
void insert(ViewElement *);
void erase(iterator i);
void erase(iterator from, iterator to);
void eraseSingle(ViewElement *);
iterator findPrevious(const std::string &type, iterator i);
iterator findNext(const std::string &type, iterator i);
/**
* Returns an iterator pointing to that specific element,
* end() otherwise
*/
iterator findSingle(ViewElement *);
const_iterator findSingle(ViewElement *e) const {
return const_iterator(((const ViewElementList *)this)->findSingle(e));
}
/**
* Returns first iterator pointing at or after the given time,
* end() if time is beyond the end of the list
*/
iterator findTime(timeT time);
const_iterator findTime(timeT time) const {
return const_iterator(((const ViewElementList *)this)->findTime(time));
}
/**
* Returns iterator pointing to the first element starting at
* or before the given absolute time
*/
iterator findNearestTime(timeT time);
const_iterator findNearestTime(timeT time) const {
return const_iterator(((const ViewElementList *)this)->findNearestTime(time));
}
};
}
#endif
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