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Current view: top level - slideshow/source/inc - interruptabledelayevent.hxx (source / functions) Hit Total Coverage
Test: commit e02a6cb2c3e2b23b203b422e4e0680877f232636 Lines: 0 22 0.0 %
Date: 2014-04-14 Functions: 0 11 0.0 %
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       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_INTERRUPTABLEDELAYEVENT_HXX
      21             : #define INCLUDED_SLIDESHOW_INTERRUPTABLEDELAYEVENT_HXX
      22             : 
      23             : #include "delayevent.hxx"
      24             : 
      25             : namespace slideshow
      26             : {
      27             :     namespace internal
      28             :     {
      29             :         /** Event, which delays calling passed Event's fire() method
      30             :             the given amount of time.
      31             : 
      32             :             This is actually a facade around the passed event object,
      33             :             that passes on all calls to that object, and the sole
      34             :             contribution of itself is the delay.
      35             :         */
      36           0 :         class DelayFacade : public Event
      37             :         {
      38             :         public:
      39           0 :             DelayFacade( const EventSharedPtr&  rEvent,
      40             :                          double                 nTimeout    ) :
      41             :                 Event("DelayFacade"),
      42             :                 mpEvent( rEvent ),
      43           0 :                 mnTimeout( nTimeout )
      44             :             {
      45           0 :             }
      46             : 
      47           0 :             virtual bool fire() SAL_OVERRIDE
      48             :             {
      49           0 :                 if( mpEvent && isCharged() )
      50             :                 {
      51             :                     // pass on directly - we're supposed to be called
      52             :                     // from EventQueue here, anyway - and if not,
      53             :                     // we're only keeping that incorrect transitively.
      54           0 :                     return mpEvent->fire();
      55             :                 }
      56             : 
      57           0 :                 return false;
      58             :             }
      59             : 
      60           0 :             virtual bool isCharged() const SAL_OVERRIDE
      61             :             {
      62             :                 // pass on to wrappee - this ensures that we return
      63             :                 // false on isCharged(), even if the other event has
      64             :                 // been fired outside our own fire() method
      65           0 :                 return !mpEvent ? false : mpEvent->isCharged();
      66             :             }
      67             : 
      68           0 :             virtual double getActivationTime( double nCurrentTime ) const SAL_OVERRIDE
      69             :             {
      70             :                 // enforce _our_ timeout to our clients (this
      71             :                 // overrides any timeout possibly set at the wrappee!)
      72           0 :                 return nCurrentTime + mnTimeout;
      73             :             }
      74             : 
      75           0 :             virtual void dispose() SAL_OVERRIDE
      76             :             {
      77           0 :                 mpEvent.reset();
      78           0 :             }
      79             : 
      80             :         private:
      81             :             EventSharedPtr  mpEvent;
      82             :             double          mnTimeout;
      83             :         };
      84             : 
      85             :         /// Return value for makeInterruptableDelay()
      86           0 :         struct InterruptableEventPair
      87             :         {
      88             :             /** This member contains a pointer to the timeout
      89             :                 event. When enqueued, this event will fire the
      90             :                 requested action only after the specified timeout.
      91             :              */
      92             :             EventSharedPtr  mpTimeoutEvent;
      93             : 
      94             :             /** This member contains a pointer to the interruption
      95             :                 event. When enqueued, this event will fire
      96             :                 immediately, interrupting a potentially waiting
      97             :                 timeout event.
      98             :              */
      99             :             EventSharedPtr  mpImmediateEvent;
     100             :         };
     101             : 
     102             :         /** Generate an interruptable delay event.
     103             : 
     104             :             This function generates a pair of events, that are
     105             :             especially tailored to achieve the following behaviour: By
     106             :             default, the given functor is called after the specified
     107             :             timeout (after insertion of the event into the EventQueue,
     108             :             of course). But optionally, when the interruption event
     109             :             InterruptableEventPair::mpImmediateEvent is fired, the
     110             :             given functor is called <em>at once</em>, and the delay is
     111             :             ignored (that means, the given functor is guaranteed to be
     112             :             called at utmost once, and never twice. Furthermore, it is
     113             :             ensured that both events return false on isCharged(), once
     114             :             anyone of them has been fired already).
     115             : 
     116             :             @param rFunctor
     117             :             Functor to call when the event fires.
     118             : 
     119             :             @param nTimeout
     120             :             Timeout in seconds, to wait until functor is called.
     121             : 
     122             :             @returns a pair of events, where the first one waits the
     123             :             specified amount of time, and the other fires the given
     124             :             functor immediately.
     125             :          */
     126           0 :         template< typename Functor > InterruptableEventPair makeInterruptableDelay( const Functor&  rFunctor,
     127             :                                                                                     double          nTimeout    )
     128             :         {
     129           0 :             InterruptableEventPair aRes;
     130             : 
     131           0 :             aRes.mpImmediateEvent = makeEvent( rFunctor, "makeInterruptableDelay");
     132           0 :             aRes.mpTimeoutEvent.reset( new DelayFacade( aRes.mpImmediateEvent,
     133           0 :                                                         nTimeout ) );
     134             : 
     135           0 :             return aRes;
     136             :         }
     137             :     }
     138             : }
     139             : 
     140             : #endif /* INCLUDED_SLIDESHOW_INTERRUPTABLEDELAYEVENT_HXX */
     141             : 
     142             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */

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