/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */ /* 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_css_AnimationCommon_h #define mozilla_css_AnimationCommon_h #include <algorithm> // For <std::stable_sort> #include "mozilla/AnimationCollection.h" #include "mozilla/AnimationComparator.h" #include "mozilla/EventDispatcher.h" #include "mozilla/LinkedList.h" #include "mozilla/MemoryReporting.h" #include "mozilla/dom/Animation.h" #include "mozilla/Attributes.h" // For MOZ_NON_OWNING_REF #include "mozilla/Assertions.h" #include "nsContentUtils.h" #include "nsCSSPseudoElements.h" #include "nsCycleCollectionParticipant.h" class nsIFrame; class nsPresContext; namespace mozilla { namespace dom { class Element; } template <class AnimationType> class CommonAnimationManager { public: explicit CommonAnimationManager(nsPresContext *aPresContext) : mPresContext(aPresContext) { } // NOTE: This can return null after Disconnect(). nsPresContext* PresContext() const { return mPresContext; } /** * Notify the manager that the pres context is going away. */ void Disconnect() { // Content nodes might outlive the transition or animation manager. RemoveAllElementCollections(); mPresContext = nullptr; } protected: virtual ~CommonAnimationManager() { MOZ_ASSERT(!mPresContext, "Disconnect should have been called"); } void AddElementCollection(AnimationCollection<AnimationType>* aCollection) { mElementCollections.insertBack(aCollection); } void RemoveAllElementCollections() { while (AnimationCollection<AnimationType>* head = mElementCollections.getFirst()) { head->Destroy(); // Note: this removes 'head' from mElementCollections. } } LinkedList<AnimationCollection<AnimationType>> mElementCollections; nsPresContext *mPresContext; // weak (non-null from ctor to Disconnect) }; /** * Utility class for referencing the element that created a CSS animation or * transition. It is non-owning (i.e. it uses a raw pointer) since it is only * expected to be set by the owned animation while it actually being managed * by the owning element. * * This class also abstracts the comparison of an element/pseudo-class pair * for the sake of composite ordering since this logic is common to both CSS * animations and transitions. * * (We call this OwningElementRef instead of just OwningElement so that we can * call the getter on CSSAnimation/CSSTransition OwningElement() without * clashing with this object's contructor.) */ class OwningElementRef final { public: OwningElementRef() : mElement(nullptr) , mPseudoType(CSSPseudoElementType::NotPseudo) { } OwningElementRef(dom::Element& aElement, CSSPseudoElementType aPseudoType) : mElement(&aElement) , mPseudoType(aPseudoType) { } bool Equals(const OwningElementRef& aOther) const { return mElement == aOther.mElement && mPseudoType == aOther.mPseudoType; } bool LessThan(const OwningElementRef& aOther) const { MOZ_ASSERT(mElement && aOther.mElement, "Elements to compare should not be null"); if (mElement != aOther.mElement) { return nsContentUtils::PositionIsBefore(mElement, aOther.mElement); } return mPseudoType == CSSPseudoElementType::NotPseudo || (mPseudoType == CSSPseudoElementType::before && aOther.mPseudoType == CSSPseudoElementType::after); } bool IsSet() const { return !!mElement; } void GetElement(dom::Element*& aElement, CSSPseudoElementType& aPseudoType) const { aElement = mElement; aPseudoType = mPseudoType; } nsPresContext* GetRenderedPresContext() const; private: dom::Element* MOZ_NON_OWNING_REF mElement; CSSPseudoElementType mPseudoType; }; template <class EventInfo> class DelayedEventDispatcher { public: DelayedEventDispatcher() : mIsSorted(true) { } void QueueEvent(EventInfo&& aEventInfo) { mPendingEvents.AppendElement(Forward<EventInfo>(aEventInfo)); mIsSorted = false; } // This is exposed as a separate method so that when we are dispatching // *both* transition events and animation events we can sort both lists // once using the current state of the document before beginning any // dispatch. void SortEvents() { if (mIsSorted) { return; } // FIXME: Replace with mPendingEvents.StableSort when bug 1147091 is // fixed. std::stable_sort(mPendingEvents.begin(), mPendingEvents.end(), EventInfoLessThan()); mIsSorted = true; } // Takes a reference to the owning manager's pres context so it can // detect if the pres context is destroyed while dispatching one of // the events. // // This will call SortEvents automatically if it has not already been // called. void DispatchEvents(nsPresContext* const & aPresContext) { if (!aPresContext || mPendingEvents.IsEmpty()) { return; } SortEvents(); EventArray events; mPendingEvents.SwapElements(events); // mIsSorted will be set to true by SortEvents above, and we leave it // that way since mPendingEvents is now empty for (EventInfo& info : events) { EventDispatcher::Dispatch(info.mElement, aPresContext, &info.mEvent); if (!aPresContext) { break; } } } void ClearEventQueue() { mPendingEvents.Clear(); mIsSorted = true; } bool HasQueuedEvents() const { return !mPendingEvents.IsEmpty(); } // Methods for supporting cycle-collection void Traverse(nsCycleCollectionTraversalCallback* aCallback, const char* aName) { for (EventInfo& info : mPendingEvents) { ImplCycleCollectionTraverse(*aCallback, info.mElement, aName); ImplCycleCollectionTraverse(*aCallback, info.mAnimation, aName); } } void Unlink() { ClearEventQueue(); } protected: class EventInfoLessThan { public: bool operator()(const EventInfo& a, const EventInfo& b) const { if (a.mTimeStamp != b.mTimeStamp) { // Null timestamps sort first if (a.mTimeStamp.IsNull() || b.mTimeStamp.IsNull()) { return a.mTimeStamp.IsNull(); } else { return a.mTimeStamp < b.mTimeStamp; } } AnimationPtrComparator<RefPtr<dom::Animation>> comparator; return comparator.LessThan(a.mAnimation, b.mAnimation); } }; typedef nsTArray<EventInfo> EventArray; EventArray mPendingEvents; bool mIsSorted; }; template <class EventInfo> inline void ImplCycleCollectionUnlink(DelayedEventDispatcher<EventInfo>& aField) { aField.Unlink(); } template <class EventInfo> inline void ImplCycleCollectionTraverse(nsCycleCollectionTraversalCallback& aCallback, DelayedEventDispatcher<EventInfo>& aField, const char* aName, uint32_t aFlags = 0) { aField.Traverse(&aCallback, aName); } } // namespace mozilla #endif /* !defined(mozilla_css_AnimationCommon_h) */