ProjectTimeSignature.h

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/*  SPDX-License-Identifier: GPL-2.0-or-later */
/**********************************************************************
 
 Audacity: A Digital Audio Editor
 
 @file ProjectTimeSignature.h
 
 Dmitry Vedenko
 
 **********************************************************************/
#pragma once
 
#include "ClientData.h"
#include "Observer.h"
 
class AudacityProject;
 
struct TimeSignatureChangedMessage final
{
   double newTempo {};
   int newUpperTimeSignature {};
   int newLowerTimeSignature {};
};
 
class NUMERIC_FORMATS_API ProjectTimeSignature final :
    public ClientData::Base,
    public Observer::Publisher<TimeSignatureChangedMessage>
{
public:
   static ProjectTimeSignature& Get(AudacityProject& project);
   static const ProjectTimeSignature& Get(const AudacityProject& project);
 
   ProjectTimeSignature();
   ~ProjectTimeSignature() override;
 
   double GetTempo() const;
   void   SetTempo(double tempo);
 
   int  GetUpperTimeSignature() const;
   void SetUpperTimeSignature(int upperTimeSignature);
 
   int  GetLowerTimeSignature() const;
   void SetLowerTimeSignature(int lowerTimeSignature);
 
   double GetQuarterDuration() const;
   double GetBeatDuration() const;
   double GetBarDuration() const;
 
private:
   void PublishSignatureChange();
   
   double mTempo;
   int mUpperTimeSignature;
   int mLowerTimeSignature;
};