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