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Side by Side Diff: third_party/WebKit/Source/core/dom/IntersectionObservationRegistry.cpp

Issue 1449623002: IntersectionObserver: second cut. (Closed) Base URL: https://chromium.googlesource.com/chromium/src@master
Patch Set: Use existing Document::m_weakFactory. Created 5 years, 1 month ago
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1 // Copyright 2015 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 #include "config.h"
6 #include "core/dom/IntersectionObservationRegistry.h"
7
8 #include "core/dom/Document.h"
9
10 namespace blink {
11
12 typedef HeapVector<Member<IntersectionObserver>> IntersectionObserverVector;
13
14 IntersectionObservationRegistry::IntersectionObservationRegistry(Timer<Document> & timer)
15 : m_timer(timer)
16 {
17 }
18
19 void IntersectionObservationRegistry::activateIntersectionObserver(IntersectionO bserver& observer)
20 {
21 if (m_activeIntersectionObservers->isEmpty())
22 m_timer.startOneShot(0, BLINK_FROM_HERE);
23 m_activeIntersectionObservers->add(&observer);
24 }
25
26 void IntersectionObservationRegistry::resumeSuspendedIntersectionObservers()
27 {
28 ASSERT(isMainThread());
29 if (m_suspendedIntersectionObservers->isEmpty())
30 return;
31
32 IntersectionObserverVector suspended;
33 copyToVector(*m_suspendedIntersectionObservers, suspended);
34 for (size_t i = 0; i < suspended.size(); ++i) {
35 if (!suspended[i]->shouldBeSuspended()) {
36 m_suspendedIntersectionObservers->remove(suspended[i]);
37 activateIntersectionObserver(*suspended[i]);
38 }
39 }
40 }
41
42 void IntersectionObservationRegistry::deliverIntersectionObservations()
43 {
44 IntersectionObserverVector observers;
45 copyToVector(*m_activeIntersectionObservers, observers);
46 m_activeIntersectionObservers.clear();
47 for (size_t i = 0; i < observers.size(); ++i) {
48 if (observers[i]->shouldBeSuspended())
49 m_suspendedIntersectionObservers->add(observers[i]);
50 else
51 observers[i]->deliver();
52 }
53 }
54
55 void IntersectionObservationRegistry::computeIntersectionObservations()
56 {
57 // TODO: Need to define timestamp.
58 double timestamp = currentTime();
59 for (auto& observation: *m_intersectionObservations) {
60 ASSERT(observation->target()->isInTreeScope());
61 observation->computeIntersectionObservations(timestamp);
62 }
63 }
64
65 void IntersectionObservationRegistry::addObservation(IntersectionObservation& ob servation)
66 {
67 m_intersectionObservations->add(&observation);
68 }
69
70 void IntersectionObservationRegistry::removeObservation(IntersectionObservation& observation)
71 {
72 m_intersectionObservations->remove(&observation);
73 }
74
75 DEFINE_TRACE(IntersectionObservationRegistry)
76 {
77 visitor->trace(m_activeIntersectionObservers);
78 visitor->trace(m_suspendedIntersectionObservers);
79 visitor->trace(m_intersectionObservations);
80 }
81
82 } // namespace blink {
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