LCOV - code coverage report
Current view: top level - slideshow/source/inc - eventqueue.hxx (source / functions) Hit Total Coverage
Test: commit 10e77ab3ff6f4314137acd6e2702a6e5c1ce1fae Lines: 0 4 0.0 %
Date: 2014-11-03 Functions: 0 6 0.0 %
Legend: Lines: hit not hit

          Line data    Source code
       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #ifndef INCLUDED_SLIDESHOW_SOURCE_INC_EVENTQUEUE_HXX
      21             : #define INCLUDED_SLIDESHOW_SOURCE_INC_EVENTQUEUE_HXX
      22             : 
      23             : #include <canvas/elapsedtime.hxx>
      24             : #include <osl/mutex.hxx>
      25             : 
      26             : #include "event.hxx"
      27             : 
      28             : #include <boost/noncopyable.hpp>
      29             : #include <functional>
      30             : #include <queue>
      31             : #include <vector>
      32             : 
      33             : 
      34             : /* Definition of ActivitiesQueue class */
      35             : 
      36             : namespace slideshow
      37             : {
      38             :     namespace internal
      39             :     {
      40             :         /** This class handles events in a presentation. Events are
      41             :             time instants where e.g. effects start.
      42             :          */
      43             :         class EventQueue : private ::boost::noncopyable
      44             :         {
      45             :         public:
      46             :             EventQueue(
      47             :                 ::boost::shared_ptr< ::canvas::tools::ElapsedTime >
      48             :                 const & pPresTimer );
      49             : 
      50             :             ~EventQueue();
      51             : 
      52             :             /** Add the given event to the queue. The event is fired
      53             :                 at, or shortly after, its Event::getActivationTime instant.
      54             :              */
      55             :             bool addEvent( const EventSharedPtr& event );
      56             : 
      57             :             /** Add the given event to the queue. The event is fired
      58             :                 at, or shortly after, its Event::getActivationTime instant.
      59             :                 The difference to addEvent() is that events added during
      60             :                 process() are postponed to next process().
      61             :              */
      62             :             bool addEventForNextRound( const EventSharedPtr& event );
      63             : 
      64             :             /** Another way to control the order of asynchronous event
      65             :                 exeqution.  Use this method to schedule events that are to
      66             :                 be executed after all regular events that have no delay,
      67             :                 even when they schedule new regular events without delay.
      68             :             */
      69             :             bool addEventWhenQueueIsEmpty (const EventSharedPtr& rpEvent);
      70             : 
      71             :             /** Process the event queue.
      72             : 
      73             :                 This method executes all events whose timeout has
      74             :                 expired when calling this method (i.e. all events
      75             :                 whose scheduled time is less or equal the current
      76             :                 time).
      77             : 
      78             :                 Check for the next available event's timeout via
      79             :                 nextTimeout(), or whether the queue is empty
      80             :                 altogether via isEmpty().
      81             :              */
      82             :             void process();
      83             : 
      84             :             /** Query state of the queue
      85             : 
      86             :                 @return false, if queue is empty, true otherwise
      87             :              */
      88             :             bool isEmpty() const;
      89             : 
      90             :             /** Query timeout for the topmost event in the queue.
      91             : 
      92             :                 @return Timeout in seconds, until the next event is
      93             :                 ready. The time returned here is relative to the pres
      94             :                 timer (i.e. the timer specified at the EventQueue
      95             :                 constructor). When the queue is empty (i.e. isEmpty()
      96             :                 returns true), the returned value is the highest
      97             :                 representable double value
      98             :                 (::std::numeric_limits<double>::max()). If the topmost
      99             :                 event in the queue is already pending, the timeout
     100             :                 returned here will actually be negative.
     101             :             */
     102             :             double nextTimeout() const;
     103             : 
     104             :             /** Remove all pending events from the queue.
     105             :              */
     106             :             void clear();
     107             : 
     108             :             /** Forces an empty queue, firing all events immediately
     109             :                 without minding any times.
     110             :                 @attention do only call from event loop, this calls process_()!
     111             :              */
     112             :             void forceEmpty();
     113             : 
     114             :             /** Gets the queue's timer object.
     115             :              */
     116             :             ::boost::shared_ptr< ::canvas::tools::ElapsedTime > const &
     117           0 :             getTimer() const { return mpTimer; }
     118             : 
     119             :         private:
     120             :             mutable ::osl::Mutex      maMutex;
     121             : 
     122           0 :             struct EventEntry : public ::std::unary_function<EventEntry, bool>
     123             :             {
     124             :                 EventSharedPtr  pEvent;
     125             :                 double          nTime;
     126             : 
     127             :                 bool operator<( const EventEntry& ) const; // to leverage priority_queue's default compare
     128             : 
     129           0 :                 EventEntry( EventSharedPtr const& p, double t )
     130           0 :                     : pEvent(p), nTime(t) {}
     131             :             };
     132             : 
     133             :             typedef ::std::priority_queue< EventEntry > ImplQueueType;
     134             :             ImplQueueType                   maEvents;
     135             :             typedef ::std::vector<EventEntry> EventEntryVector;
     136             :             EventEntryVector                maNextEvents;
     137             :             ImplQueueType                   maNextNextEvents;
     138             :             void process_( bool bFireAllEvents );
     139             : 
     140             :             // perform timing of events via relative time
     141             :             // measurements. The world time starts, when the
     142             :             // EventQueue object is created
     143             :             ::boost::shared_ptr< ::canvas::tools::ElapsedTime > mpTimer;
     144             :         };
     145             : 
     146             :     }
     147             : }
     148             : #endif // INCLUDED_SLIDESHOW_SOURCE_INC_EVENTQUEUE_HXX
     149             : 
     150             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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