/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 mozilla_AnimationTarget_h
#define mozilla_AnimationTarget_h
#include "mozilla/Attributes.h" // For MOZ_NON_OWNING_REF
#include "mozilla/HashFunctions.h" // For HashNumber, AddToHash
#include "mozilla/HashTable.h" // For DefaultHasher, PointerHasher
#include "mozilla/Maybe.h"
#include "mozilla/PseudoStyleType.h" // For PseudoStyleRequest
#include "mozilla/RefPtr.h"
class nsAtom;
namespace mozilla {
namespace dom {
class Element;
}
// namespace dom
struct OwningAnimationTarget {
OwningAnimationTarget() =
default;
OwningAnimationTarget(dom::Element* aElement,
const PseudoStyleRequest& aRequest)
: mElement(aElement), mPseudoRequest(aRequest) {}
explicit OwningAnimationTarget(dom::Element* aElement) : mElement(aElement) {}
bool operator==(
const OwningAnimationTarget& aOther)
const {
return mElement == aOther.mElement &&
mPseudoRequest == aOther.mPseudoRequest;
}
explicit operator bool()
const {
return !!mElement; }
// mElement represents the parent element of a pseudo-element, not the
// generated content element.
RefPtr<dom::Element> mElement;
PseudoStyleRequest mPseudoRequest;
};
struct NonOwningAnimationTarget {
NonOwningAnimationTarget() =
default;
NonOwningAnimationTarget(dom::Element* aElement,
const PseudoStyleRequest& aRequest)
: mElement(aElement), mPseudoRequest(aRequest) {}
explicit NonOwningAnimationTarget(
const OwningAnimationTarget& aOther)
: mElement(aOther.mElement), mPseudoRequest(aOther.mPseudoRequest) {}
bool operator==(
const NonOwningAnimationTarget& aOther)
const {
return mElement == aOther.mElement &&
mPseudoRequest == aOther.mPseudoRequest;
}
NonOwningAnimationTarget&
operator=(
const OwningAnimationTarget& aOther) {
mElement = aOther.mElement;
mPseudoRequest = aOther.mPseudoRequest;
return *
this;
}
explicit operator bool()
const {
return !!mElement; }
// mElement represents the parent element of a pseudo-element, not the
// generated content element.
dom::Element* MOZ_NON_OWNING_REF mElement = nullptr;
PseudoStyleRequest mPseudoRequest;
};
// Helper functions for cycle-collecting Maybe<OwningAnimationTarget>
inline void ImplCycleCollectionTraverse(
nsCycleCollectionTraversalCallback& aCallback,
Maybe<OwningAnimationTarget>& aTarget,
const char* aName,
uint32_t aFlags = 0) {
if (aTarget) {
ImplCycleCollectionTraverse(aCallback, aTarget->mElement, aName, aFlags);
}
}
inline void ImplCycleCollectionUnlink(Maybe<OwningAnimationTarget>& aTarget) {
if (aTarget) {
ImplCycleCollectionUnlink(aTarget->mElement);
}
}
// A DefaultHasher specialization for OwningAnimationTarget.
template <>
struct DefaultHasher<OwningAnimationTarget> {
using Key = OwningAnimationTarget;
using Lookup = OwningAnimationTarget;
using PtrHasher = PointerHasher<dom::Element*>;
using AtomPtrHasher = DefaultHasher<nsAtom*>;
static HashNumber hash(
const Lookup& aLookup) {
return AddToHash(
PtrHasher::hash(aLookup.mElement.get()),
static_cast<uint8_t>(aLookup.mPseudoRequest.mType),
AtomPtrHasher::hash(aLookup.mPseudoRequest.mIdentifier.get()));
}
static bool match(
const Key& aKey,
const Lookup& aLookup) {
return PtrHasher::match(aKey.mElement.get(), aLookup.mElement.get()) &&
aKey.mPseudoRequest.mType == aLookup.mPseudoRequest.mType &&
AtomPtrHasher::match(aKey.mPseudoRequest.mIdentifier.get(),
aLookup.mPseudoRequest.mIdentifier.get());
}
static void rekey(Key& aKey, Key&& aNewKey) { aKey = std::move(aNewKey); }
};
}
// namespace mozilla
#endif // mozilla_AnimationTarget_h
