dom/animation/CSSPseudoElement.h

   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 #ifndef mozilla_dom_CSSPseudoElement_h
   8 #define mozilla_dom_CSSPseudoElement_h
   9
  10 #include "js/TypeDecls.h"
  11 #include "mozilla/Attributes.h"
  12 #include "mozilla/dom/BindingDeclarations.h"
  13 #include "mozilla/RefPtr.h"
  14 #include "nsCSSPseudoElements.h"
  15 #include "nsWrapperCache.h"
  16
  17 namespace mozilla::dom {
  18
  19 class Animation;
  20 class Element;
  21 class UnrestrictedDoubleOrKeyframeAnimationOptions;
  22
  23 class CSSPseudoElement final : public nsWrapperCache {
  24  public:
  25   NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(CSSPseudoElement)
  26   NS_DECL_CYCLE_COLLECTION_NATIVE_WRAPPERCACHE_CLASS(CSSPseudoElement)
  27
  28  protected:
  29   virtual ~CSSPseudoElement();
  30
  31  public:
  32   ParentObject GetParentObject() const;
  33
  34   virtual JSObject* WrapObject(JSContext* aCx,
  35                                JS::Handle<JSObject*> aGivenProto) override;
  36
  37   PseudoStyleType GetType() const { return mPseudoType; }
  38   void GetType(nsString& aRetVal) const {
  39     MOZ_ASSERT(nsCSSPseudoElements::GetPseudoAtom(mPseudoType),
  40                "All pseudo-types allowed by this class should have a"
  41                " corresponding atom");
  42     // Our atoms use one colon and we would like to return two colons syntax
  43     // for the returned pseudo type string, so serialize this to the
  44     // non-deprecated two colon syntax.
  45     aRetVal.Assign(char16_t(':'));
  46     aRetVal.Append(
  47         nsDependentAtomString(nsCSSPseudoElements::GetPseudoAtom(mPseudoType)));
  48   }
  49   dom::Element* Element() const { return mOriginatingElement.get(); }
  50
  51   // Given an element:pseudoType pair, returns the CSSPseudoElement stored as a
  52   // property on |aElement|. If there is no CSSPseudoElement for the specified
  53   // pseudo-type on element, a new CSSPseudoElement will be created and stored
  54   // on the element.
  55   static already_AddRefed<CSSPseudoElement> GetCSSPseudoElement(
  56       dom::Element* aElement, PseudoStyleType aType);
  57
  58  private:
  59   // Only ::before, ::after and ::marker are supported.
  60   CSSPseudoElement(dom::Element* aElement, PseudoStyleType aType);
  61
  62   static nsAtom* GetCSSPseudoElementPropertyAtom(PseudoStyleType aType);
  63
  64   // mOriginatingElement needs to be an owning reference since if script is
  65   // holding on to the pseudo-element, it needs to continue to be able to refer
  66   // to the originating element.
  67   RefPtr<dom::Element> mOriginatingElement;
  68   PseudoStyleType mPseudoType;
  69 };
  70
  71 }  // namespace mozilla::dom
  72
  73 #endif  // mozilla_dom_CSSPseudoElement_h