Quelle  activitiesqueue.hxx   Sprache: C

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#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_ACTIVITIESQUEUE_HXX
#define INCLUDED_SLIDESHOW_SOURCE_INC_ACTIVITIESQUEUE_HXX

#include <deque>

#include "activity.hxx"

#include <canvas/elapsedtime.hxx>

#include <memory>


/* Definition of ActivitiesQueue class */

namespace slideshow::internal
    {
        /** This class handles the XSprite updates needed for
            animations, such as moves, scales etc. You can add
            activity objects to this class, which are called in a
            round-robin fashion.
        */
        class ActivitiesQueue
        {
        public:
            /** Create an ActivitiesQueue.

                @param pPresTimer
                Pointer to global presentation timer. Used for
                adjusting and holding global presentation time.
             */
            explicit ActivitiesQueue(
                std::shared_ptr< ::canvas::tools::ElapsedTime > pPresTimer );
            ~ActivitiesQueue();
            ActivitiesQueue(const ActivitiesQueue&) = delete;
            ActivitiesQueue& operator=(const ActivitiesQueue&) = delete;

            /** Add the given activity to the queue.
             */
            bool addActivity( const ActivitySharedPtr& pActivity );

            /** Add the given activity prioritized last in the queue.
             */
            bool addTailActivity( const ActivitySharedPtr& pActivity );

            /** Process the activities queue.

                This method performs the smallest atomic processing
                possible on the queue (typically, this means one
                activity get processed).
             */
            void process();

            /** Call all dequeued activities' dequeued() method
             */
            void processDequeued();

            /** Query state of the queue

                @return false, if queue is empty, true otherwise
             */
            bool isEmpty() const;

            /** Remove all pending activities from the queue.
             */
            void clear();

            /** Gets the queue's timer object.
             */
            std::shared_ptr< ::canvas::tools::ElapsedTime > const &
            getTimer() const { return mpTimer; }

        private:
            std::shared_ptr< ::canvas::tools::ElapsedTime > mpTimer;

            typedef ::std::deque< ActivitySharedPtr > ActivityQueue;

            ActivityQueue           maCurrentActivitiesWaiting;  // currently running
                                                                 // activities, that still
                                                                 // await processing for this
                                                                 // round

            ActivityQueue           maCurrentTailActivitiesWaiting; // activities that will be
                                                                    // processed last in the queue

            ActivityQueue           maCurrentActivitiesReinsert;    // currently running
                                                                      // activities, that are
                                                                      // already processed for
                                                                      // this round, and wants
                                                                    // to be reinserted next
                                                                    // round

            ActivityQueue           maDequeuedActivities; // This list collects all activities which did not request
                                                          // a reinsertion. After the screen update has been
                                                          // performed, those are notified via dequeued(). This
                                                          // facilitates cleanup actions taking place _after_ the
                                                          // current frame has been displayed.
        };

}
#endif // INCLUDED_SLIDESHOW_SOURCE_INC_ACTIVITIESQUEUE_HXX

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