зеркало из https://github.com/mozilla/gecko-dev.git
80 строки
2.4 KiB
C++
80 строки
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 mozilla_SMILTargetIdentifier_h
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#define mozilla_SMILTargetIdentifier_h
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#include "mozilla/dom/Element.h"
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namespace mozilla {
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/**
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* Struct: SMILTargetIdentifier
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*
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* Tuple of: { Animated Element, Attribute Name }
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*
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* Used in SMILAnimationController as hash key for mapping an animation
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* target to the SMILCompositor for that target.
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*
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* NOTE: Need a nsRefPtr for the element & attribute name, because
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* SMILAnimationController retain its hash table for one sample into the
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* future, and we need to make sure their target isn't deleted in that time.
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*/
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struct SMILTargetIdentifier {
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SMILTargetIdentifier()
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: mElement(nullptr),
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mAttributeName(nullptr),
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mAttributeNamespaceID(kNameSpaceID_Unknown) {}
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inline bool Equals(const SMILTargetIdentifier& aOther) const {
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return (aOther.mElement == mElement &&
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aOther.mAttributeName == mAttributeName &&
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aOther.mAttributeNamespaceID == mAttributeNamespaceID);
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}
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RefPtr<mozilla::dom::Element> mElement;
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RefPtr<nsAtom> mAttributeName;
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int32_t mAttributeNamespaceID;
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};
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/**
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* Class: SMILWeakTargetIdentifier
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*
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* Version of the above struct that uses non-owning pointers. These are kept
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* private, to ensure that they aren't ever dereferenced (or used at all,
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* outside of Equals()).
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*
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* This is solely for comparisons to determine if a target has changed
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* from one sample to the next.
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*/
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class SMILWeakTargetIdentifier {
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public:
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// Trivial constructor
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SMILWeakTargetIdentifier() : mElement(nullptr), mAttributeName(nullptr) {}
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// Allow us to update a weak identifier to match a given non-weak identifier
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SMILWeakTargetIdentifier& operator=(const SMILTargetIdentifier& aOther) {
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mElement = aOther.mElement;
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mAttributeName = aOther.mAttributeName;
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return *this;
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}
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// Allow for comparison vs. non-weak identifier
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inline bool Equals(const SMILTargetIdentifier& aOther) const {
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return (aOther.mElement == mElement &&
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aOther.mAttributeName == mAttributeName);
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}
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private:
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const nsIContent* mElement;
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const nsAtom* mAttributeName;
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};
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} // namespace mozilla
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#endif // mozilla_SMILTargetIdentifier_h
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