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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/observer/ResizeObserver.h" | |
6 | |
7 #include "core/dom/Element.h" | |
8 #include "core/frame/FrameView.h" | |
9 #include "core/frame/LocalFrame.h" | |
10 #include "core/observer/ResizeObservation.h" | |
11 #include "core/observer/ResizeObserverCallback.h" | |
12 #include "core/observer/ResizeObserverController.h" | |
13 #include "core/observer/ResizeObserverEntry.h" | |
14 | |
15 namespace blink { | |
16 | |
17 ResizeObserver* ResizeObserver::create(Document& document, ResizeObserverCallbac k* callback) | |
18 { | |
19 auto observer = new ResizeObserver(callback); | |
20 document.ensureResizeObserverController().addObserver(*observer); | |
21 return observer; | |
22 } | |
23 | |
24 ResizeObserver::ResizeObserver(ResizeObserverCallback* callback) | |
25 : m_callback(callback) | |
26 { | |
27 } | |
28 | |
29 void ResizeObserver::observe(Element* target) | |
30 { | |
31 auto observerMap = target ? target->resizeObserverData() : nullptr; | |
32 if (observerMap && observerMap->contains(this)) | |
33 return; // Already registered. | |
34 m_observations.add(new ResizeObservation(target, this)); | |
35 | |
36 LocalFrame* frame = target->document().frame(); | |
szager1
2016/07/11 18:33:47
nit:
if (FrameView* frameView = document().view()
atotic1
2016/07/11 23:18:58
Done.
| |
37 if (frame) { | |
38 if (FrameView* frameView = frame->view()) | |
39 frameView->scheduleAnimation(); | |
40 } | |
41 } | |
42 | |
43 void ResizeObserver::unobserve(Element* target) | |
44 { | |
45 auto observerMap = target ? target->resizeObserverData() : nullptr; | |
46 if (!observerMap) | |
47 return; | |
48 auto observation = observerMap->find(this); | |
49 if (observation != observerMap->end()) { | |
50 m_observations.remove((*observation).value); | |
51 observerMap->remove(observation); | |
52 } | |
53 } | |
54 | |
55 void ResizeObserver::disconnect() | |
56 { | |
57 ObservationList observations; | |
58 for (auto it = m_observations.begin(); it != m_observations.end(); ++it) | |
szager1
2016/07/11 18:33:47
nit:
m_observations.swap(observations);
atotic1
2016/07/11 23:18:58
Done.
| |
59 observations.add(*it); | |
60 | |
61 m_observations.clear(); | |
szager1
2016/07/11 18:33:47
If you use swap(), this line is unnecessary.
atotic1
2016/07/11 23:18:58
Done.
| |
62 for (auto observation : observations) { | |
63 Element* target = (*observation).target(); | |
64 if (target) { | |
65 auto& observerMap = target->ensureResizeObserverData(); | |
szager1
2016/07/11 18:33:47
Can't you just:
target->ensureResizeObserverData(
atotic1
2016/07/11 23:18:58
Wow, you can. Still rusty with my C++ collections.
| |
66 observerMap.remove(observerMap.find(this)); | |
67 } | |
68 } | |
69 m_activeObservations.clear(); | |
70 } | |
71 | |
72 bool ResizeObserver::gatherObservations() | |
73 { | |
74 DCHECK(m_activeObservations.isEmpty()); | |
75 | |
76 for (auto& observation : m_observations) { | |
77 if (observation->hasResized()) | |
78 m_activeObservations.append(*observation); | |
79 } | |
80 | |
81 return !m_activeObservations.isEmpty(); | |
82 } | |
83 | |
84 void ResizeObserver::deliverObservations() | |
85 { | |
86 if (m_activeObservations.size() == 0) | |
87 return; | |
88 | |
89 HeapVector<Member<ResizeObserverEntry>> entries; | |
90 | |
91 for (auto& observation : m_activeObservations) { | |
92 auto entry = new ResizeObserverEntry(observation->target()); | |
93 entries.append(entry); | |
94 observation->setBroadcastSize(entry->contentSize()); | |
95 } | |
96 m_callback->handleEvent(entries, this); | |
97 m_activeObservations.clear(); | |
98 } | |
99 | |
100 void ResizeObserver::clearObservations() | |
101 { | |
102 m_activeObservations.clear(); | |
103 } | |
104 | |
105 DEFINE_TRACE(ResizeObserver) | |
106 { | |
107 visitor->trace(m_callback); | |
108 visitor->trace(m_observations); | |
109 visitor->trace(m_activeObservations); | |
110 } | |
111 | |
112 } // namespace blink | |
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