domain_swap.h

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/*
 * Copyright (C) 2023 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */
 
#pragma once
 
#include <set>
 
#include "pbd/command.h"
#include "pbd/destructible.h"
#include "pbd/signals.h"
 
#include "temporal/types.h"
#include "temporal/timeline.h"
 
namespace Temporal {
 
typedef std::map<timepos_t*,timepos_t> TimeDomainPosChanges;
typedef std::map<timecnt_t*,timecnt_t> TimeDomainCntChanges;
 
struct LIBTEMPORAL_API DomainBounceInfo;
 
struct LIBTEMPORAL_API TimeDomainSwapper : public virtual PBD::Destructible {
  public:
        virtual ~TimeDomainSwapper() {}
        virtual void start_domain_bounce (DomainBounceInfo&) = 0;
        virtual void finish_domain_bounce (DomainBounceInfo&) = 0;
};
 
/* A DomainBounceInfo functions in two roles:
 *
 * 1. as part of an UndoTransaction reflecting actions taken by a user that
 * modified time domains of one or more objects.
 *
 * 2. as a standalone object used during temporary domain swaps that records
 * (perhaps opaquely) what was changed and provides a way to revert it.
 */
 
struct LIBTEMPORAL_API DomainBounceInfo
{
        DomainBounceInfo (TimeDomain f, TimeDomain t, bool m = false)
                : from (f)
                , to (t)
                , move_markers (m)
        {}
 
        const TimeDomain from;
        const TimeDomain to;
 
        TimeDomainPosChanges positions;
        TimeDomainCntChanges counts;
 
        bool move_markers;
};
 
}