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
  33 // MediaRule and DocumentRule
  34 class GroupRule : public Rule {
  35  protected:
  36   GroupRule(already_AddRefed<ServoCssRules> aRules, StyleSheet* aSheet,
  37             Rule* aParentRule, uint32_t aLineNumber, uint32_t aColumnNumber);
  38   GroupRule(const GroupRule& aCopy) = delete;
  39   virtual ~GroupRule();
  40
  41  public:
  42   NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(GroupRule, Rule)
  43   NS_DECL_ISUPPORTS_INHERITED
  44   virtual bool IsCCLeaf() const override;
  45
  46 #ifdef DEBUG
  47   void List(FILE* out = stdout, int32_t aIndent = 0) const override;
  48 #endif
  49   void DropSheetReference() override;
  50
  51  public:
  52   int32_t StyleRuleCount() const { return mRuleList ? mRuleList->Length() : 0; }
  53
  54   Rule* GetStyleRuleAt(int32_t aIndex) const {
  55     return mRuleList ? mRuleList->GetRule(aIndex) : nullptr;
  56   }
  57
  58   void SetRawAfterClone(RefPtr<ServoCssRules> aRules) {
  59     if (mRuleList) {
  60       mRuleList->SetRawAfterClone(std::move(aRules));
  61     } else {
  62       MOZ_ASSERT(!aRules, "Can't move from having no rules to having rules");
  63     }
  64   }
  65
  66   /*
  67    * The next method should never be called unless you have first called
  68    * WillDirty() on the parent stylesheet.
  69    */
  70   nsresult DeleteStyleRuleAt(uint32_t aIndex) {
  71     if (!mRuleList) {
  72       return NS_OK;
  73     }
  74     return mRuleList->DeleteRule(aIndex);
  75   }
  76
  77   // non-virtual -- it is only called by subclasses
  78   size_t SizeOfExcludingThis(MallocSizeOf) const;
  79   size_t SizeOfIncludingThis(MallocSizeOf) const override = 0;
  80
  81   // WebIDL API
  82   ServoCSSRuleList* GetCssRules() { return mRuleList; }
  83   uint32_t InsertRule(const nsACString& aRule, uint32_t aIndex,
  84                       ErrorResult& aRv);
  85   void DeleteRule(uint32_t aIndex, ErrorResult& aRv);
  86
  87  private:
  88   RefPtr<ServoCSSRuleList> mRuleList;
  89 };
  90
  91 // Implementation of WebIDL CSSConditionRule.
  92 class ConditionRule : public GroupRule {
  93  protected:
  94   using GroupRule::GroupRule;
  95
  96  public:
  97   virtual void GetConditionText(nsACString& aConditionText) = 0;
  98   virtual void SetConditionText(const nsACString& aConditionText,
  99                                 ErrorResult& aRv) = 0;
 100 };
 101
 102 }  // namespace css
 103 }  // namespace mozilla
 104
 105 #endif /* mozilla_css_GroupRule_h__ */