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// -*- c-basic-offset: 4 -*-
/*
Rosegarden
A sequencer and musical notation editor.
This program is Copyright 2000-2008
Guillaume Laurent <[email protected]>,
Chris Cannam <[email protected]>,
Richard Bown <[email protected]>
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 _SEGMENT_PERFORMANCE_HELPER_H_
#define _SEGMENT_PERFORMANCE_HELPER_H_
#include "Segment.h"
#include "Composition.h" // for RealTime
namespace Rosegarden
{
class SegmentPerformanceHelper : protected SegmentHelper
{
public:
SegmentPerformanceHelper(Segment &t) : SegmentHelper(t) { }
virtual ~SegmentPerformanceHelper();
typedef std::vector<iterator> iteratorcontainer;
/**
* Returns a sequence of iterators pointing to the note events
* that are tied with the given event. If the given event is not
* a note event or is not tied, its iterator will be the only one
* in the sequence. If the given event is tied but is not the
* first in the tied chain, the returned sequence will be empty.
*/
iteratorcontainer getTiedNotes(iterator i);
/**
* Returns two sequences of iterators pointing to the note events
* that are grace notes, or host notes for grace notes, associated
* with the given event, which is itself either a grace note or a
* host note for a grace note. The grace note iterators are
* returned in the graceNotes sequence, and the host note
* iterators in hostNotes. isHostNote is set to true if the
* given event is a host note, false otherwise.
*
* If the given event is not a grace note, is a grace note with no
* host note, or is a potential host note without any grace notes,
* the sequences will both be empty and the function will return
* false.
*/
bool getGraceAndHostNotes(iterator i,
iteratorcontainer &graceNotes,
iteratorcontainer &hostNotes,
bool &isHostNote);
/**
* Returns the absolute time of the note event pointed to by i.
*/
timeT getSoundingAbsoluteTime(iterator i);
/**
* Returns the duration of the note event pointed to by i, taking
* into account any ties the note may have etc.
*
* If the note is the first of two or more tied notes, this will
* return the accumulated duration of the whole series of notes
* it's tied to.
*
* If the note is in a tied series but is not the first, this will
* return zero, because the note's duration is presumed to have
* been accounted for by a previous call to this method when
* examining the first note in the tied series.
*
* If the note is not tied, or if i does not point to a note
* event, this will just return the duration of the event at i.
*
* This method may return an incorrect duration for any note
* event that is tied but lacks a pitch property. This is
* expected behaviour; don't create tied notes without pitches.
*/
timeT getSoundingDuration(iterator i);
/**
* Returns the absolute time of the event pointed to by i,
* in microseconds elapsed since the start of the Composition.
* This method exploits the Composition's getElapsedRealTime
* method to take into account any tempo changes that appear
* in the section of the composition preceding i.
*/
RealTime getRealAbsoluteTime(iterator i);
/**
* Returns the duration of the note event pointed to by i,
* in microseconds. This takes into account the tempo in
* force at i's position within the composition, as well as
* any tempo changes occurring during the event at i.
*/
RealTime getRealSoundingDuration(iterator i);
/**
* Return a sounding duration (estimated) and start time for the
* note event pointed to by i. If host is true, i is expected to
* be the "host" note for one or more grace notes; if host is
* false, i is expected to point to a grace note. If the relevant
* expectation is not met, this function returns false. Otherwise
* the sounding time and duration are returned through t and d and
* the function returns true.
*/
bool getGraceNoteTimeAndDuration(bool host, iterator i, timeT &t, timeT &d);
};
}
#endif
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