layout/style/GroupRule.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 /*
   8  * internal interface representing CSS style rules that contain other
   9  * rules, such as @media rules
  10  */
  11
  12 #ifndef mozilla_css_GroupRule_h__
  13 #define mozilla_css_GroupRule_h__
  14
  15 #include "mozilla/Attributes.h"
  16 #include "mozilla/MemoryReporting.h"
  17 #include "mozilla/ServoCSSRuleList.h"
  18 #include "mozilla/css/Rule.h"
  19 #include "nsCycleCollectionParticipant.h"
  20
  21 namespace mozilla {
  22
  23 class ErrorResult;
  24 class StyleSheet;
  25
  26 namespace dom {
  27 class CSSRuleList;
  28 }  // namespace dom
  29
  30 namespace css {
  31
  32 // Inherits from Rule so it can be shared between MediaRule and DocumentRule
  33 class GroupRule : public Rule {
  34  protected:
  35   GroupRule(StyleSheet* aSheet, Rule* aParentRule, uint32_t aLineNumber,
  36             uint32_t aColumnNumber);
  37   virtual ~GroupRule();
  38   virtual already_AddRefed<StyleLockedCssRules> GetOrCreateRawRules() = 0;
  39
  40  public:
  41   NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(GroupRule, Rule)
  42   NS_DECL_ISUPPORTS_INHERITED
  43
  44   GroupRule(const GroupRule&) = delete;
  45   bool IsCCLeaf() const override;
  46
  47   bool IsGroupRule() const final { return true; }
  48
  49 #ifdef DEBUG
  50   void List(FILE* out = stdout, int32_t aIndent = 0) const override;
  51 #endif
  52   void DropSheetReference() override;
  53   uint32_t StyleRuleCount() { return CssRules()->Length(); }
  54   Rule* GetStyleRuleAt(int32_t aIndex) { return CssRules()->GetRule(aIndex); }
  55
  56   void DidSetRawAfterClone() {
  57     if (mRuleList) {
  58       mRuleList->SetRawAfterClone(GetOrCreateRawRules());
  59     }
  60   }
  61
  62   /*
  63    * The next method should never be called unless you have first called
  64    * WillDirty() on the parent stylesheet.
  65    */
  66   nsresult DeleteStyleRuleAt(uint32_t aIndex) {
  67     return CssRules()->DeleteRule(aIndex);
  68   }
  69
  70   // non-virtual -- it is only called by subclasses
  71   size_t SizeOfExcludingThis(MallocSizeOf) const;
  72   size_t SizeOfIncludingThis(MallocSizeOf) const override = 0;
  73
  74   // WebIDL API
  75   ServoCSSRuleList* CssRules();
  76   uint32_t InsertRule(const nsACString& aRule, uint32_t aIndex,
  77                       ErrorResult& aRv);
  78   void DeleteRule(uint32_t aIndex, ErrorResult& aRv);
  79
  80  private:
  81   RefPtr<ServoCSSRuleList> mRuleList;
  82 };
  83
  84 // Implementation of WebIDL CSSConditionRule.
  85 class ConditionRule : public GroupRule {
  86  protected:
  87   using GroupRule::GroupRule;
  88
  89  public:
  90   virtual void GetConditionText(nsACString& aConditionText) = 0;
  91 };
  92
  93 }  // namespace css
  94 }  // namespace mozilla
  95
  96 #endif /* mozilla_css_GroupRule_h__ */