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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 "sky/engine/config.h" | |
| 6 #include "sky/engine/core/frame/PlatformEventDispatcher.h" | |
| 7 | |
| 8 #include "sky/engine/core/frame/PlatformEventController.h" | |
| 9 #include "sky/engine/wtf/TemporaryChange.h" | |
| 10 | |
| 11 namespace blink { | |
| 12 | |
| 13 PlatformEventDispatcher::PlatformEventDispatcher() | |
| 14 : m_needsPurge(false) | |
| 15 , m_isDispatching(false) | |
| 16 { | |
| 17 } | |
| 18 | |
| 19 PlatformEventDispatcher::~PlatformEventDispatcher() | |
| 20 { | |
| 21 } | |
| 22 | |
| 23 void PlatformEventDispatcher::addController(PlatformEventController* controller) | |
| 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 PlatformEventDispatcher::removeController(PlatformEventController* controll
er) | |
| 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 PlatformEventDispatcher::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 PlatformEventDispatcher::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 blink | |
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