layout/inspector/ServoStyleRuleMap.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_ServoStyleRuleMap_h
   8 #define mozilla_ServoStyleRuleMap_h
   9
  10 #include "mozilla/dom/CSSStyleRule.h"
  11 #include "mozilla/StyleSheet.h"
  12
  13 #include "nsTHashMap.h"
  14
  15 struct StyleLockedStyleRule;
  16
  17 namespace mozilla {
  18 class ServoCSSRuleList;
  19 class ServoStyleSet;
  20 namespace css {
  21 class Rule;
  22 }  // namespace css
  23 namespace dom {
  24 class ShadowRoot;
  25 }
  26 class ServoStyleRuleMap {
  27  public:
  28   ServoStyleRuleMap() = default;
  29
  30   void EnsureTable(ServoStyleSet&);
  31   void EnsureTable(dom::ShadowRoot&);
  32
  33   dom::CSSStyleRule* Lookup(const StyleLockedStyleRule* aRawRule) const {
  34     return mTable.Get(aRawRule);
  35   }
  36
  37   void SheetAdded(StyleSheet&);
  38   void SheetRemoved(StyleSheet&);
  39   void SheetCloned(StyleSheet&);
  40
  41   void RuleAdded(StyleSheet& aStyleSheet, css::Rule&);
  42   void RuleRemoved(StyleSheet& aStyleSheet, css::Rule&);
  43
  44   size_t SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const;
  45
  46   ~ServoStyleRuleMap() = default;
  47
  48  private:
  49   // Since we would never have a document which contains no style rule,
  50   // we use IsEmpty as an indication whether we need to walk through
  51   // all stylesheets to fill the table.
  52   bool IsEmpty() const { return mTable.Count() == 0; }
  53
  54   void FillTableFromRule(css::Rule&);
  55   void FillTableFromRuleList(ServoCSSRuleList&);
  56   void FillTableFromStyleSheet(StyleSheet&);
  57
  58   using Hashtable = nsTHashMap<nsPtrHashKey<const StyleLockedStyleRule>,
  59                                WeakPtr<dom::CSSStyleRule>>;
  60   Hashtable mTable;
  61 };
  62
  63 }  // namespace mozilla
  64
  65 #endif  // mozilla_ServoStyleRuleMap_h