tor-browser

The Tor Browser
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CSSPseudoElement.cpp (3020B)

      1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
      3 /* This Source Code Form is subject to the terms of the Mozilla Public
      4 * License, v. 2.0. If a copy of the MPL was not distributed with this
      5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      6 
      7 #include "mozilla/dom/CSSPseudoElement.h"
      8 
      9 #include "mozilla/AnimationComparator.h"
     10 #include "mozilla/dom/CSSPseudoElementBinding.h"
     11 #include "mozilla/dom/Element.h"
     12 #include "mozilla/dom/KeyframeEffectBinding.h"
     13 
     14 namespace mozilla::dom {
     15 
     16 NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(CSSPseudoElement, mOriginatingElement)
     17 
     18 CSSPseudoElement::CSSPseudoElement(dom::Element* aElement,
     19                                   PseudoStyleType aType)
     20    : mOriginatingElement(aElement), mPseudoType(aType) {
     21  MOZ_ASSERT(aElement);
     22  MOZ_ASSERT(AnimationUtils::IsSupportedPseudoForAnimations(aType),
     23             "Unexpected Pseudo Type");
     24 }
     25 
     26 CSSPseudoElement::~CSSPseudoElement() {
     27  // Element might have been unlinked already, so we have to do null check.
     28  if (mOriginatingElement) {
     29    mOriginatingElement->RemoveProperty(
     30        GetCSSPseudoElementPropertyAtom(mPseudoType));
     31  }
     32 }
     33 
     34 ParentObject CSSPseudoElement::GetParentObject() const {
     35  return mOriginatingElement->GetParentObject();
     36 }
     37 
     38 JSObject* CSSPseudoElement::WrapObject(JSContext* aCx,
     39                                       JS::Handle<JSObject*> aGivenProto) {
     40  return CSSPseudoElement_Binding::Wrap(aCx, this, aGivenProto);
     41 }
     42 
     43 /* static */
     44 already_AddRefed<CSSPseudoElement> CSSPseudoElement::GetCSSPseudoElement(
     45    dom::Element* aElement, PseudoStyleType aType) {
     46  if (!aElement) {
     47    return nullptr;
     48  }
     49 
     50  nsAtom* propName = CSSPseudoElement::GetCSSPseudoElementPropertyAtom(aType);
     51  RefPtr<CSSPseudoElement> pseudo =
     52      static_cast<CSSPseudoElement*>(aElement->GetProperty(propName));
     53  if (pseudo) {
     54    return pseudo.forget();
     55  }
     56 
     57  // CSSPseudoElement is a purely external interface created on-demand, and
     58  // when all references from script to the pseudo are dropped, we can drop the
     59  // CSSPseudoElement object, so use a non-owning reference from Element to
     60  // CSSPseudoElement.
     61  pseudo = new CSSPseudoElement(aElement, aType);
     62  nsresult rv = aElement->SetProperty(propName, pseudo, nullptr, true);
     63  if (NS_FAILED(rv)) {
     64    NS_WARNING("SetProperty failed");
     65    return nullptr;
     66  }
     67  return pseudo.forget();
     68 }
     69 
     70 /* static */
     71 nsAtom* CSSPseudoElement::GetCSSPseudoElementPropertyAtom(
     72    PseudoStyleType aType) {
     73  switch (aType) {
     74    case PseudoStyleType::before:
     75      return nsGkAtoms::cssPseudoElementBeforeProperty;
     76 
     77    case PseudoStyleType::after:
     78      return nsGkAtoms::cssPseudoElementAfterProperty;
     79 
     80    case PseudoStyleType::marker:
     81      return nsGkAtoms::cssPseudoElementMarkerProperty;
     82 
     83    default:
     84      MOZ_ASSERT_UNREACHABLE(
     85          "Should not try to get CSSPseudoElement "
     86          "other than ::before, ::after or ::marker");
     87      return nullptr;
     88  }
     89 }
     90 
     91 }  // namespace mozilla::dom