1*aaef562fSAndrew Rist /************************************************************** 2cdf0e10cSrcweir * 3*aaef562fSAndrew Rist * Licensed to the Apache Software Foundation (ASF) under one 4*aaef562fSAndrew Rist * or more contributor license agreements. See the NOTICE file 5*aaef562fSAndrew Rist * distributed with this work for additional information 6*aaef562fSAndrew Rist * regarding copyright ownership. The ASF licenses this file 7*aaef562fSAndrew Rist * to you under the Apache License, Version 2.0 (the 8*aaef562fSAndrew Rist * "License"); you may not use this file except in compliance 9*aaef562fSAndrew Rist * with the License. You may obtain a copy of the License at 10cdf0e10cSrcweir * 11*aaef562fSAndrew Rist * http://www.apache.org/licenses/LICENSE-2.0 12cdf0e10cSrcweir * 13*aaef562fSAndrew Rist * Unless required by applicable law or agreed to in writing, 14*aaef562fSAndrew Rist * software distributed under the License is distributed on an 15*aaef562fSAndrew Rist * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16*aaef562fSAndrew Rist * KIND, either express or implied. See the License for the 17*aaef562fSAndrew Rist * specific language governing permissions and limitations 18*aaef562fSAndrew Rist * under the License. 19cdf0e10cSrcweir * 20*aaef562fSAndrew Rist *************************************************************/ 21*aaef562fSAndrew Rist 22*aaef562fSAndrew Rist 23cdf0e10cSrcweir #ifndef INCLUDED_SLIDESHOW_WAKEUPEVENT_HXX 24cdf0e10cSrcweir #define INCLUDED_SLIDESHOW_WAKEUPEVENT_HXX 25cdf0e10cSrcweir 26cdf0e10cSrcweir #include <canvas/elapsedtime.hxx> 27cdf0e10cSrcweir 28cdf0e10cSrcweir #include "event.hxx" 29cdf0e10cSrcweir #include "activitiesqueue.hxx" 30cdf0e10cSrcweir 31cdf0e10cSrcweir #include <boost/bind.hpp> 32cdf0e10cSrcweir #include <boost/noncopyable.hpp> 33cdf0e10cSrcweir 34cdf0e10cSrcweir namespace slideshow { 35cdf0e10cSrcweir namespace internal { 36cdf0e10cSrcweir 37cdf0e10cSrcweir /** Little helper class, used to set Activities active again 38cdf0e10cSrcweir after some sleep period. 39cdf0e10cSrcweir 40cdf0e10cSrcweir Clients can use this class to schedule wakeup events at 41cdf0e10cSrcweir the EventQueue, to avoid busy-waiting for the next 42cdf0e10cSrcweir discrete time instant. 43cdf0e10cSrcweir */ 44cdf0e10cSrcweir class WakeupEvent : public Event, 45cdf0e10cSrcweir private ::boost::noncopyable 46cdf0e10cSrcweir { 47cdf0e10cSrcweir public: 48cdf0e10cSrcweir WakeupEvent( 49cdf0e10cSrcweir ::boost::shared_ptr< ::canvas::tools::ElapsedTime > const& pTimeBase, 50cdf0e10cSrcweir ActivitiesQueue & rActivityQueue ); 51cdf0e10cSrcweir 52cdf0e10cSrcweir virtual void dispose(); 53cdf0e10cSrcweir virtual bool fire(); 54cdf0e10cSrcweir virtual bool isCharged() const; 55cdf0e10cSrcweir virtual double getActivationTime( double nCurrentTime ) const; 56cdf0e10cSrcweir 57cdf0e10cSrcweir /// Start the internal timer 58cdf0e10cSrcweir void start(); 59cdf0e10cSrcweir 60cdf0e10cSrcweir /** Set the next timeout this object should generate. 61cdf0e10cSrcweir 62cdf0e10cSrcweir @param nextTime 63cdf0e10cSrcweir Absolute time, measured from the last start() call, 64cdf0e10cSrcweir when this event should wakeup the Activity again. If 65cdf0e10cSrcweir your time is relative, simply call start() just before 66cdf0e10cSrcweir every setNextTimeout() call. 67cdf0e10cSrcweir */ 68cdf0e10cSrcweir void setNextTimeout( double nextTime ); 69cdf0e10cSrcweir 70cdf0e10cSrcweir /** Set activity to wakeup. 71cdf0e10cSrcweir 72cdf0e10cSrcweir The activity given here will be reinserted into the 73cdf0e10cSrcweir ActivitiesQueue, once the timeout is reached. 74cdf0e10cSrcweir */ 75cdf0e10cSrcweir void setActivity( const ActivitySharedPtr& rActivity ); 76cdf0e10cSrcweir 77cdf0e10cSrcweir private: 78cdf0e10cSrcweir ::canvas::tools::ElapsedTime maTimer; 79cdf0e10cSrcweir double mnNextTime; 80cdf0e10cSrcweir ActivitySharedPtr mpActivity; 81cdf0e10cSrcweir ActivitiesQueue& mrActivityQueue; 82cdf0e10cSrcweir }; 83cdf0e10cSrcweir 84cdf0e10cSrcweir typedef ::boost::shared_ptr< WakeupEvent > WakeupEventSharedPtr; 85cdf0e10cSrcweir 86cdf0e10cSrcweir } // namespace internal 87cdf0e10cSrcweir } // namespace presentation 88cdf0e10cSrcweir 89cdf0e10cSrcweir #endif /* INCLUDED_SLIDESHOW_WAKEUPEVENT_HXX */ 90