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1 // Copyright 2016 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef IntersectionObservation_h | 5 #ifndef IntersectionObservation_h |
6 #define IntersectionObservation_h | 6 #define IntersectionObservation_h |
7 | 7 |
8 #include "core/dom/DOMHighResTimeStamp.h" | 8 #include "core/dom/DOMHighResTimeStamp.h" |
9 #include "platform/geometry/LayoutRect.h" | 9 #include "platform/geometry/LayoutRect.h" |
10 #include "platform/heap/Handle.h" | 10 #include "platform/heap/Handle.h" |
11 | 11 |
12 namespace blink { | 12 namespace blink { |
13 | 13 |
14 class Element; | 14 class Element; |
15 class IntersectionObserver; | 15 class IntersectionObserver; |
16 class Node; | |
17 | 16 |
18 // TODO(oilpan): Switch to GarbageCollected<> after oilpan ships. | 17 class IntersectionObservation final : public GarbageCollected<IntersectionObserv
ation> { |
19 class IntersectionObservation : public GarbageCollectedFinalized<IntersectionObs
ervation> { | |
20 public: | 18 public: |
21 IntersectionObservation(IntersectionObserver&, Element&, bool shouldReportRo
otBounds); | 19 IntersectionObservation(IntersectionObserver&, Element&, bool shouldReportRo
otBounds); |
22 | 20 |
23 struct IntersectionGeometry { | 21 struct IntersectionGeometry { |
24 LayoutRect targetRect; | 22 LayoutRect targetRect; |
25 LayoutRect intersectionRect; | 23 LayoutRect intersectionRect; |
26 LayoutRect rootRect; | 24 LayoutRect rootRect; |
27 bool doesIntersect; | 25 bool doesIntersect; |
28 }; | 26 }; |
29 | 27 |
30 IntersectionObserver& observer() const { return *m_observer; } | 28 IntersectionObserver& observer() const { return *m_observer; } |
31 Element* target() const; | 29 Element* target() const { return m_target; } |
32 unsigned lastThresholdIndex() const { return m_lastThresholdIndex; } | 30 unsigned lastThresholdIndex() const { return m_lastThresholdIndex; } |
33 void setLastThresholdIndex(unsigned index) { m_lastThresholdIndex = index; } | 31 void setLastThresholdIndex(unsigned index) { m_lastThresholdIndex = index; } |
34 bool shouldReportRootBounds() const { return m_shouldReportRootBounds; } | 32 bool shouldReportRootBounds() const { return m_shouldReportRootBounds; } |
35 void computeIntersectionObservations(DOMHighResTimeStamp); | 33 void computeIntersectionObservations(DOMHighResTimeStamp); |
36 void disconnect(); | 34 void disconnect(); |
37 void clearRootAndRemoveFromTarget(); | 35 void clearRootAndRemoveFromTarget(); |
38 | 36 |
39 DECLARE_TRACE(); | 37 DECLARE_TRACE(); |
40 | 38 |
41 private: | 39 private: |
42 void applyRootMargin(LayoutRect&) const; | 40 void applyRootMargin(LayoutRect&) const; |
43 void initializeGeometry(IntersectionGeometry&) const; | 41 void initializeGeometry(IntersectionGeometry&) const; |
44 void initializeTargetRect(LayoutRect&) const; | 42 void initializeTargetRect(LayoutRect&) const; |
45 void initializeRootRect(LayoutRect&) const; | 43 void initializeRootRect(LayoutRect&) const; |
46 void clipToRoot(IntersectionGeometry&) const; | 44 void clipToRoot(IntersectionGeometry&) const; |
47 void mapTargetRectToTargetFrameCoordinates(LayoutRect&) const; | 45 void mapTargetRectToTargetFrameCoordinates(LayoutRect&) const; |
48 void mapRootRectToRootFrameCoordinates(LayoutRect&) const; | 46 void mapRootRectToRootFrameCoordinates(LayoutRect&) const; |
49 void mapRootRectToTargetFrameCoordinates(LayoutRect&) const; | 47 void mapRootRectToTargetFrameCoordinates(LayoutRect&) const; |
50 bool computeGeometry(IntersectionGeometry&) const; | 48 bool computeGeometry(IntersectionGeometry&) const; |
51 | 49 |
52 Member<IntersectionObserver> m_observer; | 50 Member<IntersectionObserver> m_observer; |
53 | 51 |
54 // TODO(szager): Why Node instead of Element? Because NodeIntersectionObser
verData::createWeakPtr() | 52 WeakMember<Element> m_target; |
55 // returns a WeakPtr<Node>, which cannot be coerced into a WeakPtr<Element>.
When oilpan rolls out, | |
56 // this can be changed to WeakMember<Element>. | |
57 WeakMember<Node> m_target; | |
58 | 53 |
59 unsigned m_shouldReportRootBounds : 1; | 54 unsigned m_shouldReportRootBounds : 1; |
60 unsigned m_lastThresholdIndex : 30; | 55 unsigned m_lastThresholdIndex : 30; |
61 }; | 56 }; |
62 | 57 |
63 } // namespace blink | 58 } // namespace blink |
64 | 59 |
65 #endif // IntersectionObservation_h | 60 #endif // IntersectionObservation_h |
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