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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 #include "core/dom/IntersectionObserverController.h" | |
6 | |
7 #include "core/dom/Document.h" | |
8 | |
9 namespace blink { | |
10 | |
11 typedef HeapVector<Member<IntersectionObserver>> IntersectionObserverVector; | |
12 | |
13 IntersectionObserverController::IntersectionObserverController() | |
14 : m_timer(this, &IntersectionObserverController::deliverIntersectionObservat ions) | |
15 { | |
16 } | |
17 | |
18 IntersectionObserverController::~IntersectionObserverController() { } | |
19 | |
20 void IntersectionObserverController::scheduleIntersectionObserverForDelivery(Int ersectionObserver& observer) | |
21 { | |
22 // TODO(szager): use idle callback with a timeout | |
23 if (!m_timer.isActive()) | |
24 m_timer.startOneShot(0, BLINK_FROM_HERE); | |
25 m_pendingIntersectionObservers.add(&observer); | |
26 } | |
27 | |
28 void IntersectionObserverController::deliverIntersectionObservations(Timer<Inter sectionObserverController>*) | |
29 { | |
30 IntersectionObserverVector observers; | |
31 copyToVector(m_pendingIntersectionObservers, observers); | |
32 m_pendingIntersectionObservers.clear(); | |
33 for (auto& observer : observers) | |
34 observer->deliver(); | |
35 } | |
36 | |
37 void IntersectionObserverController::computeTrackedIntersectionObservations() | |
38 { | |
39 // TODO(szager): Need to define timestamp. | |
40 double timestamp = currentTime(); | |
41 for (auto& observer : m_trackedIntersectionObservers) | |
haraken
2016/01/07 00:48:17
Just to confirm: It is not possible that m_tracked
szager1
2016/01/07 07:12:22
That's correct. Javascript cannot run during the
| |
42 observer->computeIntersectionObservations(timestamp); | |
43 } | |
44 | |
45 void IntersectionObserverController::addTrackedObserver(IntersectionObserver& ob server) | |
46 { | |
47 m_trackedIntersectionObservers.add(&observer); | |
48 } | |
49 | |
50 void IntersectionObserverController::removeTrackedObserversForRoot(const Element & root) | |
51 { | |
52 HeapVector<Member<IntersectionObserver>> toRemove; | |
53 for (auto& observer : m_trackedIntersectionObservers) { | |
54 if (observer->root() == &root) | |
55 toRemove.append(observer); | |
56 } | |
57 m_trackedIntersectionObservers.removeAll(toRemove); | |
58 } | |
59 | |
60 DEFINE_TRACE(IntersectionObserverController) | |
61 { | |
62 visitor->trace(m_trackedIntersectionObservers); | |
63 visitor->trace(m_pendingIntersectionObservers); | |
64 } | |
65 | |
66 } // namespace blink | |
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