office-gobmx/slideshow/source/inc/wakeupevent.hxx

93 lines
3 KiB
C++

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#ifndef INCLUDED_SLIDESHOW_WAKEUPEVENT_HXX
#define INCLUDED_SLIDESHOW_WAKEUPEVENT_HXX
#include <canvas/elapsedtime.hxx>
#include "event.hxx"
#include "activitiesqueue.hxx"
#include <boost/bind.hpp>
#include <boost/noncopyable.hpp>
namespace slideshow {
namespace internal {
/** Little helper class, used to set Activities active again
after some sleep period.
Clients can use this class to schedule wakeup events at
the EventQueue, to avoid busy-waiting for the next
discrete time instant.
*/
class WakeupEvent : public Event,
private ::boost::noncopyable
{
public:
WakeupEvent(
::boost::shared_ptr< ::canvas::tools::ElapsedTime > const& pTimeBase,
ActivitiesQueue & rActivityQueue );
virtual void dispose();
virtual bool fire();
virtual bool isCharged() const;
virtual double getActivationTime( double nCurrentTime ) const;
/// Start the internal timer
void start();
/** Set the next timeout this object should generate.
@param nextTime
Absolute time, measured from the last start() call,
when this event should wakeup the Activity again. If
your time is relative, simply call start() just before
every setNextTimeout() call.
*/
void setNextTimeout( double nextTime );
/** Set activity to wakeup.
The activity given here will be reinserted into the
ActivitiesQueue, once the timeout is reached.
*/
void setActivity( const ActivitySharedPtr& rActivity );
private:
::canvas::tools::ElapsedTime maTimer;
double mnNextTime;
ActivitySharedPtr mpActivity;
ActivitiesQueue& mrActivityQueue;
};
typedef ::boost::shared_ptr< WakeupEvent > WakeupEventSharedPtr;
} // namespace internal
} // namespace presentation
#endif /* INCLUDED_SLIDESHOW_WAKEUPEVENT_HXX */