dom/animation/PseudoElementHashEntry.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_PseudoElementHashEntry_h
   8 #define mozilla_PseudoElementHashEntry_h
   9
  10 #include "mozilla/dom/Element.h"
  11 #include "mozilla/AnimationTarget.h"
  12 #include "mozilla/HashFunctions.h"
  13 #include "PLDHashTable.h"
  14
  15 namespace mozilla {
  16
  17 // A hash entry that uses a RefPtr<dom::Element>, PseudoStyleType pair
  18 class PseudoElementHashEntry : public PLDHashEntryHdr {
  19  public:
  20   typedef NonOwningAnimationTarget KeyType;
  21   typedef const NonOwningAnimationTarget* KeyTypePointer;
  22
  23   explicit PseudoElementHashEntry(KeyTypePointer aKey)
  24       : mElement(aKey->mElement), mPseudoType(aKey->mPseudoType) {}
  25   PseudoElementHashEntry(PseudoElementHashEntry&& aOther) = default;
  26
  27   ~PseudoElementHashEntry() = default;
  28
  29   KeyType GetKey() const { return {mElement, mPseudoType}; }
  30   bool KeyEquals(KeyTypePointer aKey) const {
  31     return mElement == aKey->mElement && mPseudoType == aKey->mPseudoType;
  32   }
  33
  34   static KeyTypePointer KeyToPointer(KeyType& aKey) { return &aKey; }
  35   static PLDHashNumber HashKey(KeyTypePointer aKey) {
  36     if (!aKey) return 0;
  37
  38     // Convert the scoped enum into an integer while adding it to hash.
  39     static_assert(sizeof(PseudoStyleType) == sizeof(uint8_t), "");
  40     return mozilla::HashGeneric(aKey->mElement,
  41                                 static_cast<uint8_t>(aKey->mPseudoType));
  42   }
  43   enum { ALLOW_MEMMOVE = true };
  44
  45   RefPtr<dom::Element> mElement;
  46   PseudoStyleType mPseudoType;
  47 };
  48
  49 }  // namespace mozilla
  50
  51 #endif  // mozilla_PseudoElementHashEntry_h