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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/observer/ResizeObserverController.h" | 5 #include "core/observer/ResizeObserverController.h" |
6 | 6 |
7 #include "core/observer/ResizeObserver.h" | 7 #include "core/observer/ResizeObserver.h" |
8 | 8 |
9 | 9 |
10 namespace blink { | 10 namespace blink { |
11 | 11 |
12 ResizeObserverController::ResizeObserverController() | 12 ResizeObserverController::ResizeObserverController() |
| 13 : m_observersChanged(false) |
13 { | 14 { |
14 } | 15 } |
15 | 16 |
16 void ResizeObserverController::addObserver(ResizeObserver& observer) | 17 void ResizeObserverController::addObserver(ResizeObserver& observer) |
17 { | 18 { |
18 m_observers.add(&observer); | 19 m_observers.add(&observer); |
19 } | 20 } |
20 | 21 |
| 22 size_t ResizeObserverController::gatherObservations(size_t deeperThan) |
| 23 { |
| 24 size_t shallowest = ResizeObserverController::kDepthBottom; |
| 25 if (!m_observersChanged) |
| 26 return shallowest; |
| 27 for (auto& observer : m_observers) { |
| 28 size_t depth = observer->gatherObservations(deeperThan); |
| 29 if (depth < shallowest) |
| 30 shallowest = depth; |
| 31 } |
| 32 return shallowest; |
| 33 } |
| 34 |
| 35 bool ResizeObserverController::skippedObservations() |
| 36 { |
| 37 for (auto& observer : m_observers) { |
| 38 if (observer->skippedObservations()) |
| 39 return true; |
| 40 } |
| 41 return false; |
| 42 } |
| 43 |
| 44 void ResizeObserverController::deliverObservations() |
| 45 { |
| 46 m_observersChanged = false; |
| 47 // Copy is needed because m_observers might get modified during deliverObser
vations. |
| 48 HeapVector<Member<ResizeObserver>> observers; |
| 49 copyToVector(m_observers, observers); |
| 50 |
| 51 for (auto& observer : observers) { |
| 52 if (observer) { |
| 53 observer->deliverObservations(); |
| 54 m_observersChanged = m_observersChanged || observer->hasElementSizeC
hanged(); |
| 55 } |
| 56 } |
| 57 } |
| 58 |
| 59 void ResizeObserverController::clearObservations() |
| 60 { |
| 61 for (auto& observer : m_observers) |
| 62 observer->clearObservations(); |
| 63 } |
21 | 64 |
22 DEFINE_TRACE(ResizeObserverController) | 65 DEFINE_TRACE(ResizeObserverController) |
23 { | 66 { |
24 visitor->trace(m_observers); | 67 visitor->trace(m_observers); |
25 } | 68 } |
26 | 69 |
27 } // namespace blink | 70 } // namespace blink |
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