| // Copyright 2016 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef IntersectionObserverController_h |
| #define IntersectionObserverController_h |
| |
| #include "core/dom/ActiveDOMObject.h" |
| #include "core/dom/IntersectionObserver.h" |
| #include "platform/heap/Handle.h" |
| #include "wtf/HashSet.h" |
| #include "wtf/WeakPtr.h" |
| |
| // Design doc for IntersectionObserver implementation: |
| // https://docs.google.com/a/google.com/document/d/1hLK0eyT5_BzyNS4OkjsnoqqFQDYCbKfyBinj94OnLiQ |
| |
| namespace blink { |
| |
| class Document; |
| |
| class IntersectionObserverController |
| : public GarbageCollectedFinalized<IntersectionObserverController>, |
| public ActiveDOMObject { |
| USING_GARBAGE_COLLECTED_MIXIN(IntersectionObserverController); |
| |
| public: |
| static IntersectionObserverController* create(Document*); |
| ~IntersectionObserverController(); |
| |
| void resume() override; |
| |
| void scheduleIntersectionObserverForDelivery(IntersectionObserver&); |
| void deliverIntersectionObservations(); |
| void computeTrackedIntersectionObservations(); |
| void addTrackedObserver(IntersectionObserver&); |
| void removeTrackedObserversForRoot(const Node&); |
| |
| DECLARE_TRACE(); |
| |
| private: |
| explicit IntersectionObserverController(Document*); |
| |
| private: |
| // IntersectionObservers for which this is the tracking document. |
| HeapHashSet<WeakMember<IntersectionObserver>> m_trackedIntersectionObservers; |
| // IntersectionObservers for which this is the execution context of the |
| // callback. |
| HeapHashSet<Member<IntersectionObserver>> m_pendingIntersectionObservers; |
| WTF::WeakPtrFactory<IntersectionObserverController> m_weakPtrFactory; |
| |
| bool m_callbackFiredWhileSuspended; |
| }; |
| |
| } // namespace blink |
| |
| #endif // IntersectionObserverController_h |