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| 1 // Copyright 2014 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/frame/DeviceEventDispatcherBase.h" |
| 7 |
| 8 #include "core/frame/DeviceEventControllerBase.h" |
| 9 #include "wtf/TemporaryChange.h" |
| 10 |
| 11 namespace WebCore { |
| 12 |
| 13 DeviceEventDispatcherBase::DeviceEventDispatcherBase() |
| 14 : m_needsPurge(false) |
| 15 , m_isDispatching(false) |
| 16 { |
| 17 } |
| 18 |
| 19 DeviceEventDispatcherBase::~DeviceEventDispatcherBase() |
| 20 { |
| 21 } |
| 22 |
| 23 void DeviceEventDispatcherBase::addController(DeviceEventControllerBase* control
ler) |
| 24 { |
| 25 bool wasEmpty = m_controllers.isEmpty(); |
| 26 if (!m_controllers.contains(controller)) |
| 27 m_controllers.append(controller); |
| 28 if (wasEmpty) |
| 29 startListening(); |
| 30 } |
| 31 |
| 32 void DeviceEventDispatcherBase::removeController(DeviceEventControllerBase* cont
roller) |
| 33 { |
| 34 // Do not actually remove the controller from the vector, instead zero them
out. |
| 35 // The zeros are removed in these two cases: |
| 36 // 1. either immediately if we are not dispatching any events, |
| 37 // 2. or after events to all controllers have dispatched (see notifyControll
ers()). |
| 38 // This is to correctly handle the re-entrancy case when a controller is des
troyed |
| 39 // while the events are still being dispatched. |
| 40 size_t index = m_controllers.find(controller); |
| 41 if (index == kNotFound) |
| 42 return; |
| 43 |
| 44 m_controllers[index] = 0; |
| 45 m_needsPurge = true; |
| 46 |
| 47 if (!m_isDispatching) |
| 48 purgeControllers(); |
| 49 } |
| 50 |
| 51 void DeviceEventDispatcherBase::purgeControllers() |
| 52 { |
| 53 ASSERT(m_needsPurge); |
| 54 |
| 55 size_t i = 0; |
| 56 while (i < m_controllers.size()) { |
| 57 if (!m_controllers[i]) { |
| 58 m_controllers[i] = m_controllers.last(); |
| 59 m_controllers.removeLast(); |
| 60 } else { |
| 61 ++i; |
| 62 } |
| 63 } |
| 64 |
| 65 m_needsPurge = false; |
| 66 |
| 67 if (m_controllers.isEmpty()) |
| 68 stopListening(); |
| 69 } |
| 70 |
| 71 void DeviceEventDispatcherBase::notifyControllers() |
| 72 { |
| 73 { |
| 74 TemporaryChange<bool> changeIsDispatching(m_isDispatching, true); |
| 75 // Don't notify controllers removed or added during event dispatch. |
| 76 size_t size = m_controllers.size(); |
| 77 for (size_t i = 0; i < size; ++i) { |
| 78 if (m_controllers[i]) |
| 79 m_controllers[i]->didUpdateData(); |
| 80 } |
| 81 } |
| 82 |
| 83 if (m_needsPurge) |
| 84 purgeControllers(); |
| 85 } |
| 86 |
| 87 } // namespace WebCore |
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