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