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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 IntersectionObserver_h | 5 #ifndef IntersectionObserver_h |
6 #define IntersectionObserver_h | 6 #define IntersectionObserver_h |
7 | 7 |
8 #include "bindings/core/v8/ExceptionStatePlaceholder.h" | 8 #include "bindings/core/v8/ExceptionStatePlaceholder.h" |
9 #include "bindings/core/v8/ScriptWrappable.h" | 9 #include "bindings/core/v8/ScriptWrappable.h" |
10 #include "core/dom/IntersectionObservation.h" | 10 #include "core/dom/IntersectionObservation.h" |
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26 class CORE_EXPORT IntersectionObserver final | 26 class CORE_EXPORT IntersectionObserver final |
27 : public GarbageCollectedFinalized<IntersectionObserver>, | 27 : public GarbageCollectedFinalized<IntersectionObserver>, |
28 public ScriptWrappable { | 28 public ScriptWrappable { |
29 DEFINE_WRAPPERTYPEINFO(); | 29 DEFINE_WRAPPERTYPEINFO(); |
30 | 30 |
31 public: | 31 public: |
32 using EventCallback = | 32 using EventCallback = |
33 Function<void(const HeapVector<Member<IntersectionObserverEntry>>&), | 33 Function<void(const HeapVector<Member<IntersectionObserverEntry>>&), |
34 WTF::SameThreadAffinity>; | 34 WTF::SameThreadAffinity>; |
35 | 35 |
| 36 // Defines the assumed initial state of the observed element. If the actual |
| 37 // state is the same as the initial state, then no observation will be |
| 38 // delivered. kAuto means the initial observation will always get sent. |
| 39 enum class InitialState { |
| 40 // TODO(skyostil): Add support for kVisible. |
| 41 kAuto, |
| 42 kHidden, |
| 43 }; |
| 44 |
36 static IntersectionObserver* create(const IntersectionObserverInit&, | 45 static IntersectionObserver* create(const IntersectionObserverInit&, |
37 IntersectionObserverCallback&, | 46 IntersectionObserverCallback&, |
38 ExceptionState&); | 47 ExceptionState&); |
39 static IntersectionObserver* create(const Vector<Length>& rootMargin, | 48 static IntersectionObserver* create(const Vector<Length>& rootMargin, |
40 const Vector<float>& thresholds, | 49 const Vector<float>& thresholds, |
41 Document*, | 50 Document*, |
42 std::unique_ptr<EventCallback>, | 51 std::unique_ptr<EventCallback>, |
43 ExceptionState& = ASSERT_NO_EXCEPTION); | 52 ExceptionState& = ASSERT_NO_EXCEPTION); |
44 static void resumeSuspendedObservers(); | 53 static void resumeSuspendedObservers(); |
45 | 54 |
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65 void applyRootMargin(LayoutRect&) const; | 74 void applyRootMargin(LayoutRect&) const; |
66 unsigned firstThresholdGreaterThan(float ratio) const; | 75 unsigned firstThresholdGreaterThan(float ratio) const; |
67 void deliver(); | 76 void deliver(); |
68 void removeObservation(IntersectionObservation&); | 77 void removeObservation(IntersectionObservation&); |
69 bool hasEntries() const { return m_entries.size(); } | 78 bool hasEntries() const { return m_entries.size(); } |
70 const HeapLinkedHashSet<WeakMember<IntersectionObservation>>& observations() | 79 const HeapLinkedHashSet<WeakMember<IntersectionObservation>>& observations() |
71 const { | 80 const { |
72 return m_observations; | 81 return m_observations; |
73 } | 82 } |
74 | 83 |
| 84 // Set the assumed initial state of the observed element. Note that this can |
| 85 // only be set before calling observe(). |
| 86 // TODO(skyostil): Move this setting to IntersectionObserverInit once the API |
| 87 // is finalized. |
| 88 void setInitialState(InitialState); |
| 89 |
75 DECLARE_TRACE(); | 90 DECLARE_TRACE(); |
76 | 91 |
77 private: | 92 private: |
78 explicit IntersectionObserver(IntersectionObserverCallback&, | 93 explicit IntersectionObserver(IntersectionObserverCallback&, |
79 Node&, | 94 Node&, |
80 const Vector<Length>& rootMargin, | 95 const Vector<Length>& rootMargin, |
81 const Vector<float>& thresholds); | 96 const Vector<float>& thresholds); |
82 void clearWeakMembers(Visitor*); | 97 void clearWeakMembers(Visitor*); |
83 | 98 |
84 Member<IntersectionObserverCallback> m_callback; | 99 Member<IntersectionObserverCallback> m_callback; |
85 WeakMember<Node> m_root; | 100 WeakMember<Node> m_root; |
86 HeapLinkedHashSet<WeakMember<IntersectionObservation>> m_observations; | 101 HeapLinkedHashSet<WeakMember<IntersectionObservation>> m_observations; |
87 HeapVector<Member<IntersectionObserverEntry>> m_entries; | 102 HeapVector<Member<IntersectionObserverEntry>> m_entries; |
88 Vector<float> m_thresholds; | 103 Vector<float> m_thresholds; |
89 Length m_topMargin; | 104 Length m_topMargin; |
90 Length m_rightMargin; | 105 Length m_rightMargin; |
91 Length m_bottomMargin; | 106 Length m_bottomMargin; |
92 Length m_leftMargin; | 107 Length m_leftMargin; |
| 108 InitialState m_initialState; |
93 }; | 109 }; |
94 | 110 |
95 } // namespace blink | 111 } // namespace blink |
96 | 112 |
97 #endif // IntersectionObserver_h | 113 #endif // IntersectionObserver_h |
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