100 lines
3.3 KiB
C++
100 lines
3.3 KiB
C++
/*************************************************************************
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* Copyright 2000, 2010 Oracle and/or its affiliates.
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*
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* OpenOffice.org - a multi-platform office productivity suite
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*
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* This file is part of OpenOffice.org.
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*
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* OpenOffice.org is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License version 3
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* only, as published by the Free Software Foundation.
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*
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* OpenOffice.org is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License version 3 for more details
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* (a copy is included in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU Lesser General Public License
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* version 3 along with OpenOffice.org. If not, see
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* <http://www.openoffice.org/license.html>
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* for a copy of the LGPLv3 License.
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*
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************************************************************************/
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#ifndef INCLUDED_SLIDESHOW_ACTIVITY_HXX
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#define INCLUDED_SLIDESHOW_ACTIVITY_HXX
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#include <sal/types.h>
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#include <boost/shared_ptr.hpp>
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#include "disposable.hxx"
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/* Definition of Activity interface */
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namespace slideshow
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{
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namespace internal
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{
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class Activity : public Disposable
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{
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public:
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/** Perform the activity associated with this interface's
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implementation.
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@return true, if activity continues, or false, if activity has
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ended.
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*/
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virtual bool perform() = 0;
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/** Calculates whether the activity lags time.
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If this method returns a time lag greater than 0.0,
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the ActivitiesQueue will adjust the global slideshow
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time, by subtracting the given amount of lag.
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@return time lag or 0.0. Value must be greater or
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equal than zero.
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*/
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virtual double calcTimeLag() const = 0;
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/** Query whether this activity is still continuing
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@return true, if this activity still
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continues. Returns false, if activity has ended. It is
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required that operator() returns false, when
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isActive() returns false. Furthermore, it is required
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that the inactive state is persistent; an activity
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that has become inactive (i.e. isActive() once
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returned false) must stay in that state eternally.
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*/
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virtual bool isActive() const = 0;
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/** Notifies the Activity that it has now left the
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ActivitiesQueue
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Use this method to react on the queue removal
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event. For animated shapes, this is e.g. used to
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switch back to the non-sprite presentation mode of the
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shape.
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*/
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virtual void dequeued() = 0;
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/** Forces this activity deactivate and get to its end state
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(if possible), but does _not_ dispose.
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*/
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virtual void end() = 0;
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};
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typedef ::boost::shared_ptr< Activity > ActivitySharedPtr;
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}
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}
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#endif /* INCLUDED_SLIDESHOW_ACTIVITY_HXX */
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