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| 1 /* | |
| 2 * Copyright (C) 2013 Google Inc. All rights reserved. | |
| 3 * | |
| 4 * Redistribution and use in source and binary forms, with or without | |
| 5 * modification, are permitted provided that the following conditions are | |
| 6 * met: | |
| 7 * | |
| 8 * * Redistributions of source code must retain the above copyright | |
| 9 * notice, this list of conditions and the following disclaimer. | |
| 10 * * Redistributions in binary form must reproduce the above | |
| 11 * copyright notice, this list of conditions and the following disclaimer | |
| 12 * in the documentation and/or other materials provided with the | |
| 13 * distribution. | |
| 14 * * Neither the name of Google Inc. nor the names of its | |
| 15 * contributors may be used to endorse or promote products derived from | |
| 16 * this software without specific prior written permission. | |
| 17 * | |
| 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
| 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
| 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
| 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
| 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
| 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
| 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
| 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 29 */ | |
| 30 | |
| 31 #include "config.h" | |
| 32 #include "core/frame/DeviceSensorEventDispatcher.h" | |
| 33 | |
| 34 namespace WebCore { | |
| 35 | |
| 36 DeviceSensorEventDispatcher::DeviceSensorEventDispatcher() | |
| 37 : m_needsPurge(false) | |
| 38 , m_isDispatching(false) | |
| 39 { | |
| 40 } | |
| 41 | |
| 42 DeviceSensorEventDispatcher::~DeviceSensorEventDispatcher() | |
| 43 { | |
| 44 } | |
| 45 | |
| 46 void DeviceSensorEventDispatcher::addController(DeviceSensorEventController* con
troller) | |
| 47 { | |
| 48 bool wasEmpty = m_controllers.isEmpty(); | |
| 49 if (!m_controllers.contains(controller)) | |
| 50 m_controllers.append(controller); | |
| 51 if (wasEmpty) | |
| 52 startListening(); | |
| 53 } | |
| 54 | |
| 55 void DeviceSensorEventDispatcher::removeController(DeviceSensorEventController*
controller) | |
| 56 { | |
| 57 // Do not actually remove the controller from the vector, instead zero them
out. | |
| 58 // The zeros are removed in these two cases: | |
| 59 // 1. either immediately if we are not dispatching any events, | |
| 60 // 2. or after events to all controllers have dispatched | |
| 61 // (see e.g. DeviceOrientationDispatcher::didChangeDeviceOrientation). | |
| 62 // This is to correctly handle the re-entrancy case when a controller is des
troyed | |
| 63 // while the events are still being dispatched. | |
| 64 size_t index = m_controllers.find(controller); | |
| 65 if (index == kNotFound) | |
| 66 return; | |
| 67 | |
| 68 m_controllers[index] = 0; | |
| 69 m_needsPurge = true; | |
| 70 | |
| 71 if (!m_isDispatching) | |
| 72 purgeControllers(); | |
| 73 } | |
| 74 | |
| 75 void DeviceSensorEventDispatcher::purgeControllers() | |
| 76 { | |
| 77 ASSERT(m_needsPurge); | |
| 78 | |
| 79 size_t i = 0; | |
| 80 while (i < m_controllers.size()) { | |
| 81 if (!m_controllers[i]) { | |
| 82 m_controllers[i] = m_controllers.last(); | |
| 83 m_controllers.removeLast(); | |
| 84 } else { | |
| 85 ++i; | |
| 86 } | |
| 87 } | |
| 88 | |
| 89 m_needsPurge = false; | |
| 90 | |
| 91 if (m_controllers.isEmpty()) | |
| 92 stopListening(); | |
| 93 } | |
| 94 | |
| 95 } // namespace WebCore | |
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Chromium Code Reviews
Issue 336693004:
Deduplicate DeviceEvent* classes (Closed)
Base URL: https://chromium.googlesource.com/chromium/blink.git@master