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