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78 lines
2.4 KiB
78 lines
2.4 KiB
/*
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Rosegarden
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A MIDI and audio sequencer and musical notation editor.
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This program is Copyright 2000-2008
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Guillaume Laurent <glaurent@telegraph-road.org>,
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Chris Cannam <cannam@all-day-breakfast.com>,
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Richard Bown <richard.bown@ferventsoftware.com>
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The moral rights of Guillaume Laurent, Chris Cannam, and Richard
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Bown to claim authorship of this work have been asserted.
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Other copyrights also apply to some parts of this work. Please
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see the AUTHORS file and individual file headers for details.
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version. See the file
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COPYING included with this distribution for more information.
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*/
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#include "CollapseNotesCommand.h"
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#include "base/Event.h"
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#include "base/SegmentNotationHelper.h"
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#include "base/Selection.h"
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#include "document/BasicSelectionCommand.h"
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#include <tqstring.h>
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namespace Rosegarden
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{
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void
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CollapseNotesCommand::modifySegment()
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{
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SegmentNotationHelper helper(getSegment());
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timeT endTime = getEndTime();
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// This is really nasty stuff. We can't go in forward direction
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// using the j-iterator trick because collapseNoteAggressively may
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// erase the following iterator as well as the preceding one. We
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// can't go backward naively, because collapseNoteAggressively
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// erases i from the EventSelection now that it's a
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// SegmentObserver. We need the fancy hybrid j-iterator-backward
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// technique applied to selections instead of segments.
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EventSelection::eventcontainer::iterator i =
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m_selection->getSegmentEvents().end();
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EventSelection::eventcontainer::iterator j = i;
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EventSelection::eventcontainer::iterator beg =
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m_selection->getSegmentEvents().begin();
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bool thisOne = false;
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while (i != beg && (!thisOne || (*i != *beg))) {
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--j;
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if (thisOne) {
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helper.collapseNoteAggressively(*i, endTime);
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}
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// rather than "true" one could perform a test to see
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// whether j pointed to a candidate for collapsing:
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thisOne = true;
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i = j;
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}
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if (thisOne) {
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helper.collapseNoteAggressively(*i, endTime);
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}
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}
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}
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