| // 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 IntersectionObservation_h |
| #define IntersectionObservation_h |
| |
| #include "platform/geometry/LayoutRect.h" |
| #include "platform/heap/Handle.h" |
| |
| namespace blink { |
| |
| class Element; |
| class IntersectionObserver; |
| class Node; |
| |
| // TODO(oilpan): Switch to GarbageCollected<> after oilpan ships. |
| class IntersectionObservation : public GarbageCollectedFinalized<IntersectionObservation> { |
| public: |
| IntersectionObservation(IntersectionObserver&, Element&, bool shouldReportRootBounds); |
| |
| struct IntersectionGeometry { |
| LayoutRect targetRect; |
| LayoutRect intersectionRect; |
| LayoutRect rootRect; |
| }; |
| |
| IntersectionObserver& observer() const { return *m_observer; } |
| Element* target() const; |
| bool isActive() const { return m_active; } |
| void setActive(bool active) { m_active = active; } |
| unsigned lastThresholdIndex() const { return m_lastThresholdIndex; } |
| void setLastThresholdIndex(unsigned index) { m_lastThresholdIndex = index; } |
| bool shouldReportRootBounds() const { return m_shouldReportRootBounds; } |
| void computeIntersectionObservations(double timestamp); |
| void disconnect(); |
| void clearRootAndRemoveFromTarget(); |
| |
| DECLARE_TRACE(); |
| |
| private: |
| void initializeGeometry(IntersectionGeometry&); |
| void clipToRoot(LayoutRect&); |
| void clipToFrameView(IntersectionGeometry&); |
| bool computeGeometry(IntersectionGeometry&); |
| |
| Member<IntersectionObserver> m_observer; |
| |
| // TODO(szager): Why Node instead of Element? Because NodeIntersectionObserverData::createWeakPtr() |
| // returns a WeakPtr<Node>, which cannot be coerced into a WeakPtr<Element>. When oilpan rolls out, |
| // this can be changed to WeakMember<Element>. |
| WeakPtrWillBeWeakMember<Node> m_target; |
| |
| unsigned m_active : 1; |
| unsigned m_shouldReportRootBounds : 1; |
| unsigned m_lastThresholdIndex : 30; |
| }; |
| |
| } // namespace blink |
| |
| #endif // IntersectionObservation_h |