activitiesqueue.hxx

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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
    {
        class ActivitiesQueue
        {
        public:
            explicit ActivitiesQueue(
                std::shared_ptr< ::canvas::tools::ElapsedTime > pPresTimer );
            ~ActivitiesQueue();
            ActivitiesQueue(const ActivitiesQueue&) = delete;
            ActivitiesQueue& operator=(const ActivitiesQueue&) = delete;
 
            bool addActivity( const ActivitySharedPtr& pActivity );
 
            bool addTailActivity( const ActivitySharedPtr& pActivity );
 
            void process();
 
            void processDequeued();
 
            bool isEmpty() const;
 
            void clear();
 
            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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