layout/style/TimelineCollection.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_TimelineCollection_h
   8 #define mozilla_TimelineCollection_h
   9
  10 #include "mozilla/Assertions.h"
  11 #include "mozilla/LinkedList.h"
  12 #include "mozilla/Maybe.h"
  13 #include "mozilla/RefPtr.h"
  14 #include "nsAtomHashKeys.h"
  15 #include "nsTHashMap.h"
  16
  17 class nsAtom;
  18
  19 namespace mozilla {
  20 namespace dom {
  21 class Element;
  22 }
  23 enum class PseudoStyleType : uint8_t;
  24
  25 // The collection of ScrollTimeline or ViewTimeline. We use the template class
  26 // to share the implementation for these two timeline types.
  27 template <class TimelineType>
  28 class TimelineCollection final
  29     : public LinkedListElement<TimelineCollection<TimelineType>> {
  30  public:
  31   using SelfType = TimelineCollection<TimelineType>;
  32   using TimelineMap = nsTHashMap<RefPtr<nsAtom>, RefPtr<TimelineType>>;
  33
  34   TimelineCollection(dom::Element& aElement, PseudoStyleType aPseudoType)
  35       : mElement(aElement), mPseudo(aPseudoType) {
  36     MOZ_COUNT_CTOR(TimelineCollection);
  37   }
  38
  39   ~TimelineCollection();
  40
  41   already_AddRefed<TimelineType> Lookup(nsAtom* aName) const {
  42     return mTimelines.Get(aName).forget();
  43   }
  44
  45   already_AddRefed<TimelineType> Extract(nsAtom* aName) {
  46     Maybe<RefPtr<TimelineType>> timeline = mTimelines.Extract(aName);
  47     return timeline ? timeline->forget() : nullptr;
  48   }
  49
  50   void Swap(TimelineMap& aValue) { mTimelines.SwapElements(aValue); }
  51
  52   void Destroy();
  53
  54   // Get the collection of timelines for the given |aElement| and or create it
  55   // if it does not already exist.
  56   static TimelineCollection* Get(const dom::Element* aElement,
  57                                  PseudoStyleType aPseudoType);
  58   const TimelineMap& Timelines() const { return mTimelines; }
  59
  60  private:
  61   // The element. Weak reference is fine since it owns us.
  62   dom::Element& mElement;
  63   const PseudoStyleType mPseudo;
  64
  65   TimelineMap mTimelines;
  66 };
  67
  68 }  // namespace mozilla
  69
  70 #endif  // mozilla_TimelineCollection_h