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livetrax/gtk2_ardour/tempo_map_change.h

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1.9 KiB
C++

/*
Copyright (C) 2022 Paul Davis
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <string>
#include "temporal/tempo.h"
#include "public_editor.h"
/* RAII for tempo map edits. This object manages both Tempo map RCU stuff, plus
* reversible command state, removing the need for repeated boilerplate at each
* map edit site.
*
* One complication: GUI tempo map markers are all reassociated with the
* relevant points of the write-copy of the map during ::begin() (typically
* called in the constructor, unless it's begin argument is false). You must
* delay getting a reference on a point to edit until after the TempoMapChange
* object has called begin() (i.e. has been constructed), otherwise the
* reference will point to the "old" copy of the map.
*/
class TempoMapChange {
public:
TempoMapChange (PublicEditor& e, std::string const & name, bool update_on_commit = true, bool begin = true);
~TempoMapChange ();
void begin ();
void abort ();
void use_new_map (Temporal::TempoMap::WritableSharedPtr);
Temporal::TempoMap& map() const { return *writable_map.get(); }
private:
PublicEditor& editor;
Temporal::TempoMap::WritableSharedPtr writable_map;
std::string name;
bool aborted;
bool begun;
bool update_on_commit;
XMLNode* before;
};