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| 1 // Copyright 2016 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #ifndef IntersectionObservation_h |
| 6 #define IntersectionObservation_h |
| 7 |
| 8 #include "platform/geometry/LayoutRect.h" |
| 9 #include "platform/heap/Handle.h" |
| 10 |
| 11 namespace blink { |
| 12 |
| 13 class Element; |
| 14 class IntersectionObserver; |
| 15 |
| 16 class IntersectionObservation : public GarbageCollectedFinalized<IntersectionObs
ervation> { |
| 17 public: |
| 18 IntersectionObservation(IntersectionObserver&, Element&, bool shouldReportRo
otBounds); |
| 19 |
| 20 struct IntersectionGeometry { |
| 21 LayoutRect targetRect; |
| 22 LayoutRect intersectionRect; |
| 23 LayoutRect rootRect; |
| 24 }; |
| 25 |
| 26 IntersectionObserver& observer() const { return *m_observer; } |
| 27 Element* target() const { return m_target.get(); } |
| 28 bool isActive() const { return m_active; } |
| 29 void setActive(bool active) { m_active = active; } |
| 30 unsigned lastThresholdIndex() const { return m_lastThresholdIndex; } |
| 31 void setLastThresholdIndex(unsigned index) { m_lastThresholdIndex = index; } |
| 32 bool shouldReportRootBounds() const { return m_shouldReportRootBounds; } |
| 33 |
| 34 void computeIntersectionObservations(double timestamp); |
| 35 void disconnect(); |
| 36 |
| 37 DECLARE_TRACE(); |
| 38 |
| 39 private: |
| 40 void initializeGeometry(IntersectionGeometry&); |
| 41 void clipToRoot(LayoutRect&); |
| 42 void clipToFrameView(IntersectionGeometry&); |
| 43 bool computeGeometry(IntersectionGeometry&); |
| 44 |
| 45 Member<IntersectionObserver> m_observer; |
| 46 WeakPtrWillBeWeakMember<Element> m_target; |
| 47 unsigned m_active : 1; |
| 48 unsigned m_shouldReportRootBounds : 1; |
| 49 unsigned m_lastThresholdIndex : 30; |
| 50 }; |
| 51 |
| 52 } // namespace blink |
| 53 |
| 54 #endif // IntersectionObservation_h |
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