PseudoElementHashEntry.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim: set ts=8 sts=2 et sw=2 tw=80: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_PseudoElementHashEntry_h

#define mozilla_PseudoElementHashEntry_h

#include "mozilla/dom/Element.h"

#include "mozilla/AnimationTarget.h"

#include "mozilla/HashFunctions.h"

#include "PLDHashTable.h"

namespace mozilla {

// A hash entry that uses a RefPtr<dom::Element>, PseudoStyleType pair

class PseudoElementHashEntry : public PLDHashEntryHdr {

 public:

  typedef NonOwningAnimationTarget KeyType;

  typedef const NonOwningAnimationTarget* KeyTypePointer;

  explicit PseudoElementHashEntry(KeyTypePointer aKey)

      : mElement(aKey->mElement), mPseudoType(aKey->mPseudoType) {}

  PseudoElementHashEntry(PseudoElementHashEntry&& aOther) = default;

  ~PseudoElementHashEntry() = default;

  KeyType GetKey() const { return {mElement, mPseudoType}; }

  bool KeyEquals(KeyTypePointer aKey) const {

    return mElement == aKey->mElement && mPseudoType == aKey->mPseudoType;

  static KeyTypePointer KeyToPointer(KeyType& aKey) { return &aKey; }

  static PLDHashNumber HashKey(KeyTypePointer aKey) {

    if (!aKey) return 0;

    // Convert the scoped enum into an integer while adding it to hash.

    static_assert(sizeof(PseudoStyleType) == sizeof(uint8_t), "");

    return mozilla::HashGeneric(aKey->mElement,

                                static_cast<uint8_t>(aKey->mPseudoType));

  enum { ALLOW_MEMMOVE = true };

  RefPtr<dom::Element> mElement;

  PseudoStyleType mPseudoType;

};

}  // namespace mozilla

#endif  // mozilla_PseudoElementHashEntry_h