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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/IntersectionObserverController.h" | 5 #include "core/dom/IntersectionObserverController.h" |
6 | 6 |
7 #include "core/dom/Document.h" | 7 #include "core/dom/Document.h" |
8 #include "core/dom/IdleRequestOptions.h" | 8 #include "core/dom/IdleRequestOptions.h" |
9 #include "core/dom/TaskRunnerHelper.h" | |
9 #include "platform/TraceEvent.h" | 10 #include "platform/TraceEvent.h" |
11 #include "platform/scheduler/CancellableTaskFactory.h" | |
10 | 12 |
11 namespace blink { | 13 namespace blink { |
12 | 14 |
13 IntersectionObserverController* IntersectionObserverController::create(Document* document) | 15 IntersectionObserverController* IntersectionObserverController::create(Document* document) |
14 { | 16 { |
15 IntersectionObserverController* result = new IntersectionObserverController( document); | 17 IntersectionObserverController* result = new IntersectionObserverController( document); |
16 result->suspendIfNeeded(); | 18 result->suspendIfNeeded(); |
17 return result; | 19 return result; |
18 } | 20 } |
19 | 21 |
20 IntersectionObserverController::IntersectionObserverController(Document* documen t) | 22 IntersectionObserverController::IntersectionObserverController(Document* documen t) |
21 : ActiveDOMObject(document) | 23 : ActiveDOMObject(document) |
24 , m_lowLatencyNotificationTask(CancellableTaskFactory::create(this, &Interse ctionObserverController::deliverLowLatencyNotifications)) | |
22 , m_callbackID(0) | 25 , m_callbackID(0) |
23 , m_callbackFiredWhileSuspended(false) | 26 , m_callbackFiredWhileSuspended(false) |
24 { | 27 { |
25 } | 28 } |
26 | 29 |
27 IntersectionObserverController::~IntersectionObserverController() { } | 30 IntersectionObserverController::~IntersectionObserverController() { } |
28 | 31 |
29 void IntersectionObserverController::scheduleIntersectionObserverForDelivery(Int ersectionObserver& observer) | 32 void IntersectionObserverController::scheduleIntersectionObserverForDelivery(Int ersectionObserver& observer) |
30 { | 33 { |
34 if (observer.lowLatency()) { | |
35 scheduleLowLatencyNotification(observer); | |
36 } else { | |
37 scheduleIdleNotification(observer); | |
38 } | |
39 } | |
40 | |
41 void IntersectionObserverController::scheduleIdleNotification(IntersectionObserv er& observer) | |
42 { | |
31 m_pendingIntersectionObservers.add(&observer); | 43 m_pendingIntersectionObservers.add(&observer); |
32 if (m_callbackID) | 44 if (m_callbackID) |
33 return; | 45 return; |
34 Document* document = toDocument(getExecutionContext()); | 46 Document* document = toDocument(getExecutionContext()); |
35 if (!document) | 47 if (!document) |
36 return; | 48 return; |
37 IdleRequestOptions options; | 49 IdleRequestOptions options; |
38 // The IntersectionObserver spec mandates that notifications be sent within 100ms. | 50 // The IntersectionObserver spec mandates that notifications be sent within 100ms. |
39 options.setTimeout(100); | 51 options.setTimeout(100); |
40 m_callbackID = document->requestIdleCallback(this, options); | 52 m_callbackID = document->requestIdleCallback(this, options); |
41 } | 53 } |
42 | 54 |
55 void IntersectionObserverController::scheduleLowLatencyNotification(Intersection Observer& observer) | |
56 { | |
57 m_pendingLowLatencyIntersectionObservers.add(&observer); | |
58 if (!m_lowLatencyNotificationTask->isPending()) | |
59 TaskRunnerHelper::get(TaskType::Unthrottled, getExecutionContext())->pos tTask(BLINK_FROM_HERE, m_lowLatencyNotificationTask->cancelAndCreate()); | |
ojan
2016/09/10 02:18:27
In retrospect, I wonder if unthrottled task runner
haraken
2016/09/12 00:46:32
Just help me understand: IIUC, frame throttling is
| |
60 } | |
61 | |
43 void IntersectionObserverController::resume() | 62 void IntersectionObserverController::resume() |
44 { | 63 { |
45 // If the callback fired while DOM objects were suspended, notifications mig ht be late, so deliver | 64 // If the callback fired while DOM objects were suspended, notifications mig ht be late, so deliver |
46 // them right away (rather than waiting to fire again). | 65 // them right away (rather than waiting to fire again). |
66 deliverLowLatencyNotifications(); | |
47 if (m_callbackFiredWhileSuspended) { | 67 if (m_callbackFiredWhileSuspended) { |
48 m_callbackFiredWhileSuspended = false; | 68 m_callbackFiredWhileSuspended = false; |
49 deliverIntersectionObservations(); | 69 deliverIntersectionObservations(); |
50 } | 70 } |
51 } | 71 } |
52 | 72 |
53 void IntersectionObserverController::handleEvent(IdleDeadline*) | 73 void IntersectionObserverController::handleEvent(IdleDeadline*) |
54 { | 74 { |
55 DCHECK(m_callbackID); | 75 DCHECK(m_callbackID); |
56 m_callbackID = 0; | 76 m_callbackID = 0; |
(...skipping 10 matching lines...) Expand all Loading... | |
67 if (context->activeDOMObjectsAreSuspended()) { | 87 if (context->activeDOMObjectsAreSuspended()) { |
68 m_callbackFiredWhileSuspended = true; | 88 m_callbackFiredWhileSuspended = true; |
69 return; | 89 return; |
70 } | 90 } |
71 HeapHashSet<Member<IntersectionObserver>> observers; | 91 HeapHashSet<Member<IntersectionObserver>> observers; |
72 m_pendingIntersectionObservers.swap(observers); | 92 m_pendingIntersectionObservers.swap(observers); |
73 for (auto& observer : observers) | 93 for (auto& observer : observers) |
74 observer->deliver(); | 94 observer->deliver(); |
75 } | 95 } |
76 | 96 |
97 void IntersectionObserverController::deliverLowLatencyNotifications() | |
98 { | |
99 ExecutionContext* context = getExecutionContext(); | |
100 if (!context) { | |
101 m_pendingLowLatencyIntersectionObservers.clear(); | |
102 return; | |
103 } | |
104 if (context->activeDOMObjectsAreSuspended()) { | |
105 // resume() will deliver low latency notifications directly. | |
106 return; | |
107 } | |
108 HeapHashSet<Member<IntersectionObserver>> observers; | |
109 m_pendingLowLatencyIntersectionObservers.swap(observers); | |
110 for (auto& observer : observers) | |
111 observer->deliver(); | |
112 } | |
113 | |
77 void IntersectionObserverController::computeTrackedIntersectionObservations() | 114 void IntersectionObserverController::computeTrackedIntersectionObservations() |
78 { | 115 { |
79 TRACE_EVENT0("blink", "IntersectionObserverController::computeTrackedInterse ctionObservations"); | 116 TRACE_EVENT0("blink", "IntersectionObserverController::computeTrackedInterse ctionObservations"); |
80 for (auto& observer : m_trackedIntersectionObservers) { | 117 for (auto& observer : m_trackedIntersectionObservers) { |
81 observer->computeIntersectionObservations(); | 118 observer->computeIntersectionObservations(); |
82 if (observer->hasEntries()) | 119 if (observer->hasEntries()) |
83 scheduleIntersectionObserverForDelivery(*observer); | 120 scheduleIntersectionObserverForDelivery(*observer); |
84 } | 121 } |
85 } | 122 } |
86 | 123 |
87 void IntersectionObserverController::addTrackedObserver(IntersectionObserver& ob server) | 124 void IntersectionObserverController::addTrackedObserver(IntersectionObserver& ob server) |
88 { | 125 { |
89 m_trackedIntersectionObservers.add(&observer); | 126 m_trackedIntersectionObservers.add(&observer); |
90 } | 127 } |
91 | 128 |
92 void IntersectionObserverController::removeTrackedObserversForRoot(const Node& r oot) | 129 void IntersectionObserverController::removeTrackedObserversForRoot(const Node& r oot) |
93 { | 130 { |
94 HeapVector<Member<IntersectionObserver>> toRemove; | 131 HeapVector<Member<IntersectionObserver>> toRemove; |
95 for (auto& observer : m_trackedIntersectionObservers) { | 132 for (auto& observer : m_trackedIntersectionObservers) { |
96 if (observer->rootNode() == &root) | 133 if (observer->rootNode() == &root) |
97 toRemove.append(observer); | 134 toRemove.append(observer); |
98 } | 135 } |
99 m_trackedIntersectionObservers.removeAll(toRemove); | 136 m_trackedIntersectionObservers.removeAll(toRemove); |
100 } | 137 } |
101 | 138 |
102 DEFINE_TRACE(IntersectionObserverController) | 139 DEFINE_TRACE(IntersectionObserverController) |
103 { | 140 { |
104 visitor->trace(m_trackedIntersectionObservers); | 141 visitor->trace(m_trackedIntersectionObservers); |
105 visitor->trace(m_pendingIntersectionObservers); | 142 visitor->trace(m_pendingIntersectionObservers); |
143 visitor->trace(m_pendingLowLatencyIntersectionObservers); | |
106 ActiveDOMObject::trace(visitor); | 144 ActiveDOMObject::trace(visitor); |
107 IdleRequestCallback::trace(visitor); | 145 IdleRequestCallback::trace(visitor); |
108 } | 146 } |
109 | 147 |
110 } // namespace blink | 148 } // namespace blink |
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