a64402bbdc
Change-Id: I20fe5f960c1df94c0b53e7edf33194e60f69bc74 Reviewed-on: https://gerrit.libreoffice.org/75472 Reviewed-by: Julien Nabet <serval2412@yahoo.fr> Tested-by: Julien Nabet <serval2412@yahoo.fr>
82 lines
2.7 KiB
C++
82 lines
2.7 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_EXPRESSIONNODE_HXX
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#define INCLUDED_SLIDESHOW_SOURCE_INC_EXPRESSIONNODE_HXX
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#include <memory>
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/* Definition of ExpressionNode 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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/** Interface describing an abstract animation function.
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Use this interface to model time-dependent animation
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functions of one variable.
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*/
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class AnimationFunction
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{
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public:
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virtual ~AnimationFunction() {}
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/** Operator to calculate function value.
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This method calculates the function value for the
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given time instant t.
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@param t
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Current time instant, must be in the range [0,1]
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@return the function value, typically in relative
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user coordinate space ([0,1] range).
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*/
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virtual double operator()( double t ) const = 0;
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};
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/** Refinement of AnimationFunction
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This interface is used by the SMIL function parser, to
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collapse constant values into precalculated, single nodes.
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*/
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class ExpressionNode : public AnimationFunction
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{
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public:
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/** Predicate whether this node is constant.
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This predicate returns true, if this node is
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neither time- nor ViewInfo dependent. This allows
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for certain optimizations, i.e. not the full
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expression tree needs be represented by
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ExpressionNodes.
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@returns true, if this node is neither time- nor
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ViewInfo dependent
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*/
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virtual bool isConstant() const = 0;
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};
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}
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}
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#endif // INCLUDED_SLIDESHOW_SOURCE_INC_EXPRESSIONNODE_HXX
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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