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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_EXPRESSIONNODE_HXX
21 : : #define INCLUDED_SLIDESHOW_EXPRESSIONNODE_HXX
22 : :
23 : : #include "animationfunction.hxx"
24 : :
25 : :
26 : : /* Definition of ExpressionNode interface */
27 : :
28 : : namespace slideshow
29 : : {
30 : : namespace internal
31 : : {
32 : : /** Refinement of AnimationFunction
33 : :
34 : : This interface is used by the SMIL function parser, to
35 : : collapse constant values into precalculated, single nodes.
36 : : */
37 : 0 : class ExpressionNode : public AnimationFunction
38 : : {
39 : : public:
40 : : /** Predicate whether this node is constant.
41 : :
42 : : This predicate returns true, if this node is
43 : : neither time- nor ViewInfo dependent. This allows
44 : : for certain obtimizations, i.e. not the full
45 : : expression tree needs be represented by
46 : : ExpressionNodes.
47 : :
48 : : @returns true, if this node is neither time- nor
49 : : ViewInfo dependent
50 : : */
51 : : virtual bool isConstant() const = 0;
52 : : };
53 : :
54 : : typedef ::boost::shared_ptr< ExpressionNode > ExpressionNodeSharedPtr;
55 : : }
56 : : }
57 : :
58 : : #endif /* INCLUDED_SLIDESHOW_EXPRESSIONNODE_HXX */
59 : :
60 : : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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