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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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/. */
#ifndef NS_SMILTARGETIDENTIFIER_H_
#define NS_SMILTARGETIDENTIFIER_H_
#include "mozilla/dom/Element.h"
/**
* Struct: nsSMILTargetIdentifier
*
* Tuple of: { Animated Element, Attribute Name, Attribute Type (CSS vs. XML) }
*
* Used in nsSMILAnimationController as hash key for mapping an animation
* target to the nsSMILCompositor for that target.
*
* NOTE: Need a nsRefPtr for the element & attribute name, because
* nsSMILAnimationController retain its hash table for one sample into the
* future, and we need to make sure their target isn't deleted in that time.
*/
struct nsSMILTargetIdentifier
{
nsSMILTargetIdentifier()
: mElement(nullptr), mAttributeName(nullptr),
mAttributeNamespaceID(kNameSpaceID_Unknown), mIsCSS(false) {}
inline bool Equals(const nsSMILTargetIdentifier& aOther) const
{
return (aOther.mElement == mElement &&
aOther.mAttributeName == mAttributeName &&
aOther.mAttributeNamespaceID == mAttributeNamespaceID &&
aOther.mIsCSS == mIsCSS);
}
RefPtr<mozilla::dom::Element> mElement;
RefPtr<nsIAtom> mAttributeName;
int32_t mAttributeNamespaceID;
bool mIsCSS;
};
/**
* Class: nsSMILWeakTargetIdentifier
*
* Version of the above struct that uses non-owning pointers. These are kept
* private, to ensure that they aren't ever dereferenced (or used at all,
* outside of Equals()).
*
* This is solely for comparisons to determine if a target has changed
* from one sample to the next.
*/
class nsSMILWeakTargetIdentifier
{
public:
// Trivial constructor
nsSMILWeakTargetIdentifier()
: mElement(nullptr), mAttributeName(nullptr), mIsCSS(false) {}
// Allow us to update a weak identifier to match a given non-weak identifier
nsSMILWeakTargetIdentifier&
operator=(const nsSMILTargetIdentifier& aOther)
{
mElement = aOther.mElement;
mAttributeName = aOther.mAttributeName;
mIsCSS = aOther.mIsCSS;
return *this;
}
// Allow for comparison vs. non-weak identifier
inline bool Equals(const nsSMILTargetIdentifier& aOther) const
{
return (aOther.mElement == mElement &&
aOther.mAttributeName == mAttributeName &&
aOther.mIsCSS == mIsCSS);
}
private:
const nsIContent* mElement;
const nsIAtom* mAttributeName;
bool mIsCSS;
};
#endif // NS_SMILTARGETIDENTIFIER_H_
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