1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/smil/nsSMILTargetIdentifier.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,86 @@
1.4 +/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef NS_SMILTARGETIDENTIFIER_H_
1.10 +#define NS_SMILTARGETIDENTIFIER_H_
1.11 +
1.12 +#include "mozilla/dom/Element.h"
1.13 +#include "nsAutoPtr.h"
1.14 +
1.15 +/**
1.16 + * Struct: nsSMILTargetIdentifier
1.17 + *
1.18 + * Tuple of: { Animated Element, Attribute Name, Attribute Type (CSS vs. XML) }
1.19 + *
1.20 + * Used in nsSMILAnimationController as hash key for mapping an animation
1.21 + * target to the nsSMILCompositor for that target.
1.22 + *
1.23 + * NOTE: Need a nsRefPtr for the element & attribute name, because
1.24 + * nsSMILAnimationController retain its hash table for one sample into the
1.25 + * future, and we need to make sure their target isn't deleted in that time.
1.26 + */
1.27 +
1.28 +struct nsSMILTargetIdentifier
1.29 +{
1.30 + nsSMILTargetIdentifier()
1.31 + : mElement(nullptr), mAttributeName(nullptr),
1.32 + mAttributeNamespaceID(kNameSpaceID_Unknown), mIsCSS(false) {}
1.33 +
1.34 + inline bool Equals(const nsSMILTargetIdentifier& aOther) const
1.35 + {
1.36 + return (aOther.mElement == mElement &&
1.37 + aOther.mAttributeName == mAttributeName &&
1.38 + aOther.mAttributeNamespaceID == mAttributeNamespaceID &&
1.39 + aOther.mIsCSS == mIsCSS);
1.40 + }
1.41 +
1.42 + nsRefPtr<mozilla::dom::Element> mElement;
1.43 + nsRefPtr<nsIAtom> mAttributeName;
1.44 + int32_t mAttributeNamespaceID;
1.45 + bool mIsCSS;
1.46 +};
1.47 +
1.48 +/**
1.49 + * Class: nsSMILWeakTargetIdentifier
1.50 + *
1.51 + * Version of the above struct that uses non-owning pointers. These are kept
1.52 + * private, to ensure that they aren't ever dereferenced (or used at all,
1.53 + * outside of Equals()).
1.54 + *
1.55 + * This is solely for comparisons to determine if a target has changed
1.56 + * from one sample to the next.
1.57 + */
1.58 +class nsSMILWeakTargetIdentifier
1.59 +{
1.60 +public:
1.61 + // Trivial constructor
1.62 + nsSMILWeakTargetIdentifier()
1.63 + : mElement(nullptr), mAttributeName(nullptr), mIsCSS(false) {}
1.64 +
1.65 + // Allow us to update a weak identifier to match a given non-weak identifier
1.66 + nsSMILWeakTargetIdentifier&
1.67 + operator=(const nsSMILTargetIdentifier& aOther)
1.68 + {
1.69 + mElement = aOther.mElement;
1.70 + mAttributeName = aOther.mAttributeName;
1.71 + mIsCSS = aOther.mIsCSS;
1.72 + return *this;
1.73 + }
1.74 +
1.75 + // Allow for comparison vs. non-weak identifier
1.76 + inline bool Equals(const nsSMILTargetIdentifier& aOther) const
1.77 + {
1.78 + return (aOther.mElement == mElement &&
1.79 + aOther.mAttributeName == mAttributeName &&
1.80 + aOther.mIsCSS == mIsCSS);
1.81 + }
1.82 +
1.83 +private:
1.84 + const nsIContent* mElement;
1.85 + const nsIAtom* mAttributeName;
1.86 + bool mIsCSS;
1.87 +};
1.88 +
1.89 +#endif // NS_SMILTARGETIDENTIFIER_H_
