debouncer.h

// SPDX-FileCopyrightText: © 2025 Alexandros Theodotou <alex@zrythm.org>
// SPDX-License-Identifier: LicenseRef-ZrythmLicense
 
#pragma once
 
#include <chrono>
#include <functional>
 
#include "utils/qt.h"
 
#include <QTimer>
 
namespace zrythm::utils
{

class Debouncer : public QObject
{
  Q_OBJECT
 
public:
  using Callback = std::function<void ()>;

  Debouncer (
    std::chrono::milliseconds delay,
    Callback                  callback,
    QObject *                 parent = nullptr);

  void operator() ();

  void debounce ();

  void set_delay (std::chrono::milliseconds delay);

  [[nodiscard]] std::chrono::milliseconds get_delay () const;

  [[nodiscard]] bool is_pending () const;

  void cancel ();
 
private Q_SLOTS:
  void execute_pending ();
 
private:
  utils::QObjectUniquePtr<QTimer> timer_;
  std::chrono::milliseconds       delay_;
  Callback                        callback_;
  bool                            pending_{ false };
};
 
} // namespace zrythm::utils