TempoChange.h

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/*  SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
 
  Audacity: A Digital Audio Editor
 
  TempoChange.h
 
  PaulLicameli
 
**********************************************************************/
#include "AttachedVirtualFunction.h"
#include <optional>
 
class ChannelGroup;
 
using OnProjectTempoChange =
AttachedVirtualFunction<
   struct OnProjectTempoChangeTag,
   void, ChannelGroup,
   const std::optional<double>& /* oldTempo */, double /* newTempo */
>;
DECLARE_EXPORTED_ATTACHED_VIRTUAL(
   STRETCHING_SEQUENCE_API, OnProjectTempoChange);
 
STRETCHING_SEQUENCE_API
void DoProjectTempoChange(ChannelGroup &group, double newTempo);
 
STRETCHING_SEQUENCE_API
const std::optional<double>& GetProjectTempo(const ChannelGroup &group);