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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 #include "core/dom/ElementVisibilityObserver.h" | 5 #include "core/dom/ElementVisibilityObserver.h" |
6 | 6 |
7 #include "core/dom/Element.h" | 7 #include "core/dom/Element.h" |
8 #include "core/dom/IntersectionObserverEntry.h" | 8 #include "core/dom/IntersectionObserverEntry.h" |
9 #include "core/frame/LocalFrame.h" | 9 #include "core/frame/LocalFrame.h" |
10 #include "wtf/Functional.h" | 10 #include "wtf/Functional.h" |
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24 ExecutionContext* context = m_element->getExecutionContext(); | 24 ExecutionContext* context = m_element->getExecutionContext(); |
25 DCHECK(context->isDocument()); | 25 DCHECK(context->isDocument()); |
26 Document& document = toDocument(*context); | 26 Document& document = toDocument(*context); |
27 | 27 |
28 m_intersectionObserver = IntersectionObserver::create( | 28 m_intersectionObserver = IntersectionObserver::create( |
29 Vector<Length>(), Vector<float>({std::numeric_limits<float>::min()}), | 29 Vector<Length>(), Vector<float>({std::numeric_limits<float>::min()}), |
30 &document, WTF::bind(&ElementVisibilityObserver::onVisibilityChanged, | 30 &document, WTF::bind(&ElementVisibilityObserver::onVisibilityChanged, |
31 wrapWeakPersistent(this))); | 31 wrapWeakPersistent(this))); |
32 DCHECK(m_intersectionObserver); | 32 DCHECK(m_intersectionObserver); |
33 | 33 |
34 m_intersectionObserver->setInitialState( | |
35 IntersectionObserver::InitialState::kAuto); | |
36 m_intersectionObserver->observe(m_element.release()); | 34 m_intersectionObserver->observe(m_element.release()); |
37 } | 35 } |
38 | 36 |
39 void ElementVisibilityObserver::stop() { | 37 void ElementVisibilityObserver::stop() { |
40 DCHECK(m_intersectionObserver); | 38 DCHECK(m_intersectionObserver); |
41 | 39 |
42 m_intersectionObserver->disconnect(); | 40 m_intersectionObserver->disconnect(); |
43 m_intersectionObserver = nullptr; | 41 m_intersectionObserver = nullptr; |
44 } | 42 } |
45 | 43 |
46 void ElementVisibilityObserver::deliverObservationsForTesting() { | 44 void ElementVisibilityObserver::deliverObservationsForTesting() { |
47 m_intersectionObserver->deliver(); | 45 m_intersectionObserver->deliver(); |
48 } | 46 } |
49 | 47 |
50 DEFINE_TRACE(ElementVisibilityObserver) { | 48 DEFINE_TRACE(ElementVisibilityObserver) { |
51 visitor->trace(m_element); | 49 visitor->trace(m_element); |
52 visitor->trace(m_intersectionObserver); | 50 visitor->trace(m_intersectionObserver); |
53 } | 51 } |
54 | 52 |
55 void ElementVisibilityObserver::onVisibilityChanged( | 53 void ElementVisibilityObserver::onVisibilityChanged( |
56 const HeapVector<Member<IntersectionObserverEntry>>& entries) { | 54 const HeapVector<Member<IntersectionObserverEntry>>& entries) { |
57 bool isVisible = entries.back()->intersectionRatio() > 0.f; | 55 bool isVisible = entries.back()->intersectionRatio() > 0.f; |
58 (*m_callback.get())(isVisible); | 56 (*m_callback.get())(isVisible); |
59 } | 57 } |
60 | 58 |
61 } // namespace blink | 59 } // namespace blink |
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