tempotext.h

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//=============================================================================
//  MuseScore
//  Music Composition & Notation
//
//  Copyright (C) 2002-2011 Werner Schweer
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License version 2
//  as published by the Free Software Foundation and appearing in
//  the file LICENCE.GPL
//=============================================================================

#ifndef __TEMPOTEXT_H__
#define __TEMPOTEXT_H__

#include "durationtype.h"
#include "text.h"

namespace Ms {

//-------------------------------------------------------------------
//   @@ TempoText
//
//   @P tempo       float     tempo in quarter notes (crochets) per second
//   @P followText  bool      determine tempo from text
//-------------------------------------------------------------------

class TempoText final : public TextBase  {
      qreal _tempo;           // beats per second
      bool _followText;       // parse text to determine tempo
      qreal _relative;
      bool _isRelative;

      void updateScore();
      void updateTempo();
      virtual void endEdit(EditData&) override;
      virtual void undoChangeProperty(Pid id, const QVariant&, PropertyFlags ps) override;

   public:
      TempoText(Score*);
      virtual TempoText* clone() const override   { return new TempoText(*this); }
      virtual ElementType type() const override   { return ElementType::TEMPO_TEXT; }

      virtual void write(XmlWriter& xml) const override;
      virtual void read(XmlReader&) override;

      Segment* segment() const   { return toSegment(parent()); }
      Measure* measure() const   { return toMeasure(parent()->parent()); }

      qreal tempo() const        { return _tempo;      }
      void setTempo(qreal v);
      void undoSetTempo(qreal v);
      bool isRelative()          { return _isRelative; }
      void setRelative(qreal v)  { _isRelative = true; _relative = v; }

      bool followText() const    { return _followText; }
      void setFollowText(bool v) { _followText = v;    }
      void undoSetFollowText(bool v);
      void updateRelative();

      virtual void layout();

      static int findTempoDuration(const QString& s, int& len, TDuration& dur);
      static QString duration2tempoTextString(const TDuration dur);
      static QString duration2userName(const TDuration t);

      QVariant getProperty(Pid propertyId) const override;
      bool setProperty(Pid propertyId, const QVariant&) override;
      QVariant propertyDefault(Pid id) const override;
      Sid getPropertyStyle(Pid) const override;
      virtual QString accessibleInfo() const override;
      };


}     // namespace Ms
#endif