layout/style/CSSPageRule.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_CSSPageRule_h
   8 #define mozilla_dom_CSSPageRule_h
   9
  10 #include "mozilla/css/Rule.h"
  11 #include "mozilla/ServoBindingTypes.h"
  12
  13 #include "nsDOMCSSDeclaration.h"
  14 #include "nsICSSDeclaration.h"
  15
  16 namespace mozilla {
  17 class DeclarationBlock;
  18
  19 namespace dom {
  20 class DocGroup;
  21 class CSSPageRule;
  22
  23 class CSSPageRuleDeclaration final : public nsDOMCSSDeclaration {
  24  public:
  25   NS_DECL_ISUPPORTS_INHERITED
  26
  27   css::Rule* GetParentRule() final;
  28   nsINode* GetParentObject() final;
  29
  30  protected:
  31   mozilla::DeclarationBlock* GetOrCreateCSSDeclaration(
  32       Operation aOperation, mozilla::DeclarationBlock** aCreated) final;
  33   nsresult SetCSSDeclaration(DeclarationBlock* aDecl,
  34                              MutationClosureData* aClosureData) final;
  35   Document* DocToUpdate() final { return nullptr; }
  36   nsDOMCSSDeclaration::ParsingEnvironment GetParsingEnvironment(
  37       nsIPrincipal* aSubjectPrincipal) const final;
  38
  39  private:
  40   // For accessing the constructor.
  41   friend class CSSPageRule;
  42
  43   explicit CSSPageRuleDeclaration(
  44       already_AddRefed<RawServoDeclarationBlock> aDecls);
  45   ~CSSPageRuleDeclaration();
  46
  47   inline CSSPageRule* Rule();
  48   inline const CSSPageRule* Rule() const;
  49
  50   RefPtr<DeclarationBlock> mDecls;
  51 };
  52
  53 class CSSPageRule final : public css::Rule {
  54  public:
  55   CSSPageRule(RefPtr<RawServoPageRule> aRawRule, StyleSheet* aSheet,
  56               css::Rule* aParentRule, uint32_t aLine, uint32_t aColumn);
  57
  58   NS_DECL_ISUPPORTS_INHERITED
  59   NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_CLASS_INHERITED(CSSPageRule, css::Rule)
  60
  61   bool IsCCLeaf() const final;
  62
  63   RawServoPageRule* Raw() const { return mRawRule; }
  64
  65   // WebIDL interfaces
  66   uint16_t Type() const final { return CSSRule_Binding::PAGE_RULE; }
  67   void GetCssText(nsAString& aCssText) const final;
  68   nsICSSDeclaration* Style();
  69
  70   size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const final;
  71
  72 #ifdef DEBUG
  73   void List(FILE* out = stdout, int32_t aIndent = 0) const final;
  74 #endif
  75
  76   JSObject* WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto) final;
  77
  78  private:
  79   ~CSSPageRule() = default;
  80
  81   // For computing the offset of mDecls.
  82   friend class CSSPageRuleDeclaration;
  83
  84   RefPtr<RawServoPageRule> mRawRule;
  85   CSSPageRuleDeclaration mDecls;
  86 };
  87
  88 CSSPageRule* CSSPageRuleDeclaration::Rule() {
  89   return reinterpret_cast<CSSPageRule*>(reinterpret_cast<uint8_t*>(this) -
  90                                         offsetof(CSSPageRule, mDecls));
  91 }
  92
  93 const CSSPageRule* CSSPageRuleDeclaration::Rule() const {
  94   return reinterpret_cast<const CSSPageRule*>(
  95       reinterpret_cast<const uint8_t*>(this) - offsetof(CSSPageRule, mDecls));
  96 }
  97
  98 }  // namespace dom
  99 }  // namespace mozilla
 100
 101 #endif  // mozilla_dom_CSSPageRule_h