midi_activity_provider.h

// SPDX-FileCopyrightText: © 2026 Alexandros Theodotou <alex@zrythm.org>
// SPDX-License-Identifier: LicenseRef-ZrythmLicense
 
#pragma once
 
#include <memory>
 
#include "dsp/port_observation_manager.h"
 
#include <QObject>
#include <QtQmlIntegration/qqmlintegration.h>
 
namespace zrythm::dsp
{

class MidiActivityProvider : public QObject
{
  Q_OBJECT
  QML_ELEMENT
  Q_PROPERTY (
    zrythm::dsp::Port * port READ port WRITE setPort NOTIFY portChanged)
  Q_PROPERTY (
    zrythm::dsp::PortObservationManager * portObservationManager READ
      portObservationManager WRITE setPortObservationManager NOTIFY
        portObservationManagerChanged)
  Q_PROPERTY (bool hasActivity READ hasActivity NOTIFY activityChanged)
 
public:
  explicit MidiActivityProvider (QObject * parent = nullptr);
  ~MidiActivityProvider () override;
 
  dsp::Port *   port () const;
  void          setPort (dsp::Port * port);
  Q_SIGNAL void portChanged ();
 
  dsp::PortObservationManager * portObservationManager () const;
  void setPortObservationManager (dsp::PortObservationManager * manager);
  Q_SIGNAL void portObservationManagerChanged ();

  bool          hasActivity () const;
  Q_SIGNAL void activityChanged ();

  Q_INVOKABLE bool isNoteActive (int note) const;

  Q_SIGNAL void activeNotesChanged ();

  void update ();
 
private:
  void reset_state ();
  void try_create_token ();
  void process_midi_events ();
 
  struct Impl;
  std::unique_ptr<Impl> impl_;
};
}