Line data Source code
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: */
|