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Diffstat (limited to 'slideshow/source/inc/eventqueue.hxx')
| -rw-r--r-- | slideshow/source/inc/eventqueue.hxx | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/slideshow/source/inc/eventqueue.hxx b/slideshow/source/inc/eventqueue.hxx new file mode 100644 index 000000000000..e948b4f2379f --- /dev/null +++ b/slideshow/source/inc/eventqueue.hxx @@ -0,0 +1,159 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ +/************************************************************************* + * + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * Copyright 2000, 2010 Oracle and/or its affiliates. + * + * OpenOffice.org - a multi-platform office productivity suite + * + * This file is part of OpenOffice.org. + * + * OpenOffice.org is free software: you can redistribute it and/or modify + * it under the terms of the GNU Lesser General Public License version 3 + * only, as published by the Free Software Foundation. + * + * OpenOffice.org is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU Lesser General Public License version 3 for more details + * (a copy is included in the LICENSE file that accompanied this code). + * + * You should have received a copy of the GNU Lesser General Public License + * version 3 along with OpenOffice.org. If not, see + * <http://www.openoffice.org/license.html> + * for a copy of the LGPLv3 License. + * + ************************************************************************/ + +#ifndef INCLUDED_SLIDESHOW_EVENTQUEUE_HXX +#define INCLUDED_SLIDESHOW_EVENTQUEUE_HXX + +#include <canvas/elapsedtime.hxx> +#include <osl/mutex.hxx> + +#include "event.hxx" + +#include <boost/noncopyable.hpp> +#include <functional> +#include <queue> +#include <vector> + + +/* Definition of ActivitiesQueue class */ + +namespace slideshow +{ + namespace internal + { + /** This class handles events in a presentation. Events are + time instants where e.g. effects start. + */ + class EventQueue : private ::boost::noncopyable + { + public: + EventQueue( + ::boost::shared_ptr< ::canvas::tools::ElapsedTime > + const & pPresTimer ); + + ~EventQueue(); + + /** Add the given event to the queue. The event is fired + at, or shortly after, its Event::getActivationTime instant. + */ + bool addEvent( const EventSharedPtr& event ); + + /** Add the given event to the queue. The event is fired + at, or shortly after, its Event::getActivationTime instant. + The difference to addEvent() is that events added during + process() are postponed to next process(). + */ + bool addEventForNextRound( const EventSharedPtr& event ); + + /** Another way to control the order of asynchronous event + exeqution. Use this method to schedule events that are to + be executed after all regular events that have no delay, + even when they schedule new regular events without delay. + */ + bool addEventWhenQueueIsEmpty (const EventSharedPtr& rpEvent); + + /** Process the event queue. + + This method executes all events whose timeout has + expired when calling this method (i.e. all events + whose scheduled time is less or equal the current + time). + + Check for the next available event's timeout via + nextTimeout(), or whether the queue is empty + altogether via isEmpty(). + */ + void process(); + + /** Query state of the queue + + @return false, if queue is empty, true otherwise + */ + bool isEmpty() const; + + /** Query timeout for the topmost event in the queue. + + @return Timeout in seconds, until the next event is + ready. The time returned here is relative to the pres + timer (i.e. the timer specified at the EventQueue + constructor). When the queue is empty (i.e. isEmpty() + returns true), the returned value is the highest + representable double value + (::std::numeric_limits<double>::max()). If the topmost + event in the queue is already pending, the timeout + returned here will actually be negative. + */ + double nextTimeout() const; + + /** Remove all pending events from the queue. + */ + void clear(); + + /** Forces an empty queue, firing all events immediately + without minding any times. + @attention do only call from event loop, this calls process_()! + */ + void forceEmpty(); + + /** Gets the queue's timer object. + */ + ::boost::shared_ptr< ::canvas::tools::ElapsedTime > const & + getTimer() const { return mpTimer; } + + private: + mutable ::osl::Mutex maMutex; + + struct EventEntry : public ::std::unary_function<EventEntry, bool> + { + EventSharedPtr pEvent; + double nTime; + + bool operator<( const EventEntry& ) const; // to leverage priority_queue's default compare + + EventEntry( EventSharedPtr const& p, double t ) + : pEvent(p), nTime(t) {} + }; + + typedef ::std::priority_queue< EventEntry > ImplQueueType; + ImplQueueType maEvents; + typedef ::std::vector<EventEntry> EventEntryVector; + EventEntryVector maNextEvents; + ImplQueueType maNextNextEvents; + void process_( bool bFireAllEvents ); + + // perform timing of events via relative time + // measurements. The world time starts, when the + // EventQueue object is created + ::boost::shared_ptr< ::canvas::tools::ElapsedTime > mpTimer; + }; + + } +} +#endif /* INCLUDED_SLIDESHOW_EVENTQUEUE_HXX */ + +/* vim:set shiftwidth=4 softtabstop=4 expandtab: */ |