142 lines
5.4 KiB
C++
142 lines
5.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* This file incorporates work covered by the following license notice:
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed
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* with this work for additional information regarding copyright
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* ownership. The ASF licenses this file to you under the Apache
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* License, Version 2.0 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.apache.org/licenses/LICENSE-2.0 .
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*/
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#ifndef INCLUDED_SLIDESHOW_SOURCE_INC_INTERRUPTABLEDELAYEVENT_HXX
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#define INCLUDED_SLIDESHOW_SOURCE_INC_INTERRUPTABLEDELAYEVENT_HXX
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#include "delayevent.hxx"
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#include <utility>
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namespace slideshow::internal
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{
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/** Event, which delays calling passed Event's fire() method
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the given amount of time.
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This is actually a facade around the passed event object,
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that passes on all calls to that object, and the sole
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contribution of itself is the delay.
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*/
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class DelayFacade : public Event
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{
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public:
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DelayFacade( EventSharedPtr xEvent,
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double nTimeout ) :
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Event(u"DelayFacade"_ustr),
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mpEvent(std::move( xEvent )),
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mnTimeout( nTimeout )
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{
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}
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virtual bool fire() override
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{
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if( mpEvent && isCharged() )
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{
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// pass on directly - we're supposed to be called
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// from EventQueue here, anyway - and if not,
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// we're only keeping that incorrect transitively.
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return mpEvent->fire();
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}
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return false;
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}
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virtual bool isCharged() const override
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{
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// pass on to wrappee - this ensures that we return
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// false on isCharged(), even if the other event has
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// been fired outside our own fire() method
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return mpEvent && mpEvent->isCharged();
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}
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virtual double getActivationTime( double nCurrentTime ) const override
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{
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// enforce _our_ timeout to our clients (this
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// overrides any timeout possibly set at the wrappee!)
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return nCurrentTime + mnTimeout;
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}
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virtual void dispose() override
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{
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mpEvent.reset();
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}
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private:
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EventSharedPtr mpEvent;
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double mnTimeout;
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};
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/// Return value for makeInterruptableDelay()
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struct InterruptableEventPair
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{
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/** This member contains a pointer to the timeout
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event. When enqueued, this event will fire the
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requested action only after the specified timeout.
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*/
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EventSharedPtr mpTimeoutEvent;
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/** This member contains a pointer to the interruption
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event. When enqueued, this event will fire
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immediately, interrupting a potentially waiting
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timeout event.
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*/
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EventSharedPtr mpImmediateEvent;
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};
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/** Generate an interruptable delay event.
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This function generates a pair of events, that are
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especially tailored to achieve the following behaviour: By
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default, the given functor is called after the specified
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timeout (after insertion of the event into the EventQueue,
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of course). But optionally, when the interruption event
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InterruptableEventPair::mpImmediateEvent is fired, the
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given functor is called <em>at once</em>, and the delay is
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ignored (that means, the given functor is guaranteed to be
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called at utmost once, and never twice. Furthermore, it is
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ensured that both events return false on isCharged(), once
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anyone of them has been fired already).
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@param rFunctor
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Functor to call when the event fires.
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@param nTimeout
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Timeout in seconds, to wait until functor is called.
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@returns a pair of events, where the first one waits the
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specified amount of time, and the other fires the given
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functor immediately.
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*/
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template< typename Functor > InterruptableEventPair makeInterruptableDelay( const Functor& rFunctor,
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double nTimeout )
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{
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InterruptableEventPair aRes;
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aRes.mpImmediateEvent = makeEvent( rFunctor, "makeInterruptableDelay");
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aRes.mpTimeoutEvent = std::make_shared<DelayFacade>( aRes.mpImmediateEvent,
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nTimeout );
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return aRes;
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}
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}
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#endif // INCLUDED_SLIDESHOW_SOURCE_INC_INTERRUPTABLEDELAYEVENT_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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