зеркало из https://github.com/mozilla/gecko-dev.git
94 строки
3.4 KiB
C++
94 строки
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef NS_ISMILATTR_H_
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#define NS_ISMILATTR_H_
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#include "nscore.h"
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class nsSMILValue;
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class nsISMILType;
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class nsISMILAnimationElement;
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class nsIContent;
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class nsAString;
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////////////////////////////////////////////////////////////////////////
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// nsISMILAttr: A variable targeted by SMIL for animation and can therefore have
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// an underlying (base) value and an animated value For example, an attribute of
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// a particular SVG element.
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//
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// These objects only exist during the compositing phase of SMIL animation
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// calculations. They have a single owner who is responsible for deleting the
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// object.
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class nsISMILAttr
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{
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public:
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/**
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* Creates a new nsSMILValue for this attribute from a string. The string is
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* parsed in the context of this attribute so that context-dependent values
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* such as em-based units can be resolved into a canonical form suitable for
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* animation (including interpolation etc.).
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*
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* @param aStr A string defining the new value to be created.
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* @param aSrcElement The source animation element. This may be needed to
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* provided additional context data such as for
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* animateTransform where the 'type' attribute is needed to
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* parse the value.
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* @param[out] aValue Outparam for storing the parsed value.
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* @param[out] aPreventCachingOfSandwich
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* Outparam to indicate whether the attribute contains
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* dependencies on its context that should prevent the
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* result of the animation sandwich from being cached and
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* reused in future samples.
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* @return NS_OK on success or an error code if creation failed.
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*/
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virtual nsresult ValueFromString(const nsAString& aStr,
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const nsISMILAnimationElement* aSrcElement,
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nsSMILValue& aValue,
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bool& aPreventCachingOfSandwich) const = 0;
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/**
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* Gets the underlying value of this attribute.
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*
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* @return an nsSMILValue object. returned_object.IsNull() will be true if an
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* error occurred.
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*/
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virtual nsSMILValue GetBaseValue() const = 0;
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/**
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* Clears the animated value of this attribute.
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*
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* NOTE: The animation target is not guaranteed to be in a document when this
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* method is called. (See bug 523188)
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*/
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virtual void ClearAnimValue() = 0;
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/**
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* Sets the presentation value of this attribute.
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*
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* @param aValue The value to set.
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* @return NS_OK on success or an error code if setting failed.
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*/
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virtual nsresult SetAnimValue(const nsSMILValue& aValue) = 0;
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/**
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* Returns the targeted content node, for any nsISMILAttr implementations
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* that want to expose that to the animation logic. Otherwise, returns
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* null.
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*
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* @return the targeted content node, if this nsISMILAttr implementation
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* wishes to make it avaiable. Otherwise, nullptr.
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*/
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virtual const nsIContent* GetTargetNode() const { return nullptr; }
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/**
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* Virtual destructor, to make sure subclasses can clean themselves up.
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*/
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virtual ~nsISMILAttr() {}
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};
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#endif // NS_ISMILATTR_H_
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