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 /* This file is part of the KDE libraries
  * SPDX-FileCopyrightText: 2009 Dario Freddi <drf at kde.org>
  * SPDX-FileCopyrightText: 2021 Harald Sitter <sitter@kde.org>
  *
  * SPDX-License-Identifier: LGPL-2.1-or-later
  */
 
 #ifndef KIDLETIME_H
 #define KIDLETIME_H
 
 #include <QHash>
 #include <QObject>
 #include <kidletime_export.h>
 #include <memory>
 
 #if __has_include(<chrono>)
 #include <chrono>
 #endif
 
 class KIdleTimePrivate;
 
 /**
  * @class KIdleTime kidletime.h KIdleTime
  *
  * KIdleTime is a singleton reporting information on idle time. It is useful not
  * only for finding out about the current idle time of the PC, but also for getting
  * notified upon idle time events, such as custom timeouts, or user activity.
  *
  * @note All the intervals and times in this library are in milliseconds, unless
  *       specified otherwise
  *
  * @author Dario Freddi
  *
  * @since 4.4
  */
 class KIDLETIME_EXPORT KIdleTime : public QObject
 {
     Q_OBJECT
     Q_DECLARE_PRIVATE(KIdleTime)
     Q_DISABLE_COPY(KIdleTime)
 
 public:
     /**
      * Returns the singleton instance. Use this method to access KIdleTime
      *
      * @returns the instance of KIdleTime
      */
     static KIdleTime *instance();
 
     /**
      * The destructor
      */
     ~KIdleTime() override;
 
     /**
      * Retrieves the idle time of the system, in milliseconds
      *
      * @returns the idle time of the system
      */
     int idleTime() const;
 
     /**
      * Returns the list of timeout identifiers associated with their duration, in milliseconds,
      * the library is currently listening to.
      *
      * @see addIdleTimeout
      * @see removeIdleTimeout
      * @see timeoutReached
      */
     QHash<int, int> idleTimeouts() const;
 
     /**
      * Attempts to simulate user activity. This implies that after calling this
      * method, the idle time of the system will become 0 and eventually \link resumingFromIdle \endlink
      * will be triggered
      *
      * @see resumingFromIdle
      */
     void simulateUserActivity();
 
 public Q_SLOTS:
     /**
      * Adds a new timeout to catch. When calling this method, after the system will be idle for
      * \c msec milliseconds, the signal \c timeoutReached will be triggered. Please note that until you will
      * call \c removeIdleTimeout or \c removeAllIdleTimeouts, the signal will be triggered every
      * time the system will be idle for \c msec milliseconds. This function also returns an unique
      * token for the timeout just added to allow easier identification.
      *
      * @param msec the time, in milliseconds, after which the signal will be triggered
      *
      * @returns an unique identifier for the timeout being added, that will be streamed by timeoutReached
      *
      * @see removeIdleTimeout
      * @see removeAllIdleTimeouts
      * @see timeoutReached
      *
      */
     int addIdleTimeout(int msec);
 
 #if __has_include(<chrono>)
     /**
      * Convenience overload supporting C++ chrono types. May also be used with chrono literals.
      * @since 5.83
      */
     int addIdleTimeout(std::chrono::milliseconds msec)
     {
         return addIdleTimeout(int(msec.count()));
     }
 #endif
 
     /**
      * Stops catching the idle timeout identified by the token \c identifier,
      * if it was registered earlier with addIdleTimeout.
      * Otherwise does nothing.
      *
      * @param identifier the token returned from addIdleTimeout of the timeout you want to stop listening to
      */
     void removeIdleTimeout(int identifier);
 
     /**
      * Stops catching every set timeout (if any). This means that after calling this method, the signal
      * \link timeoutReached \endlink won't be called again until you will add another timeout
      *
      * @see timeoutReached
      * @see addIdleTimeout
      */
     void removeAllIdleTimeouts();
 
     /**
      * Catches the next resume from idle event. This means that whenever user activity will be registered, or
      * \link simulateUserActivity \endlink is called, the signal \link resumingFromIdle \endlink will be triggered.
      * <p>
      * Please note that this method will trigger the signal just for the very first resume event after the call:
      * this means you explicitly have to request to track every single resume event you are interested in.
      *
      * @note This behavior is due to the fact that a resume event happens whenever the user sends an input to the
      *       system. This would lead to a massive amount of signals being delivered when the PC is being used.
      *       Moreover, you are usually interested in catching just significant resume events, such as the ones after
      *       a significant period of inactivity. For tracking user input, you can use the more efficient methods provided
      *       by Qt. The purpose of this library is just monitoring the activity of the user.
      *
      * @see resumingFromIdle
      * @see simulateUserActivity
      *
      */
     void catchNextResumeEvent();
 
     /**
      * Stops listening for resume event. This function serves for canceling \c catchNextResumeEvent, as it
      * will have effect just when \c catchNextResumeEvent has been called and \c resumingFromIdle not
      * yet triggered
      *
      * @see resumingFromIdle
      * @see catchNextResumeEvent
      *
      */
     void stopCatchingResumeEvent();
 
 Q_SIGNALS:
     /**
      * Triggered, if KIdleTime is catching resume events, when the system resumes from an idle state. This means
      * that either \link simulateUserActivity \endlink was called or the user sent an input to the system.
      *
      * @see catchNextResumeEvent
      */
     void resumingFromIdle();
 
     /**
      * Triggered when the system has been idle for x milliseconds, identified by the previously set
      * timeout.
      *
      * This signal is triggered whenever each timeout previously registered with addIdleTimeout(int)
      * is reached. It is guaranteed that \p msec will exactly correspond to the identified timeout.
      *
      * @param identifier the identifier of the timeout the system has reached
      * @param msec the time, in milliseconds, the system has been idle for
      *
      * @see addIdleTimeout
      * @see removeIdleTimeout
      */
     void timeoutReached(int identifier, int msec); // clazy:exclude=overloaded-signal
 
 private:
     KIDLETIME_NO_EXPORT KIdleTime();
 
     std::unique_ptr<KIdleTimePrivate> const d_ptr;
 };
 
 #endif /* KIDLETIME_H */