| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "modules/device_orientation/DeviceSensorEventDispatcher.h" |
| |
| namespace WebCore { |
| |
| DeviceSensorEventDispatcher::DeviceSensorEventDispatcher() |
| : m_needsPurge(false) |
| , m_isDispatching(false) |
| { |
| } |
| |
| DeviceSensorEventDispatcher::~DeviceSensorEventDispatcher() |
| { |
| } |
| |
| void DeviceSensorEventDispatcher::addController(DeviceSensorEventController* controller) |
| { |
| bool wasEmpty = m_controllers.isEmpty(); |
| if (!m_controllers.contains(controller)) |
| m_controllers.append(controller); |
| if (wasEmpty) |
| startListening(); |
| } |
| |
| void DeviceSensorEventDispatcher::removeController(DeviceSensorEventController* controller) |
| { |
| // Do not actually remove the controller from the vector, instead zero them out. |
| // The zeros are removed in these two cases: |
| // 1. either immediately if we are not dispatching any events, |
| // 2. or after didChangeDeviceMotion/Orientation has dispatched all events. |
| // This is to correctly handle the re-entrancy case when a controller is destroyed |
| // while in the didChangeDeviceMotion/Orientation method. |
| size_t index = m_controllers.find(controller); |
| if (index == kNotFound) |
| return; |
| |
| m_controllers[index] = 0; |
| m_needsPurge = true; |
| |
| if (!m_isDispatching) |
| purgeControllers(); |
| } |
| |
| void DeviceSensorEventDispatcher::purgeControllers() |
| { |
| ASSERT(m_needsPurge); |
| |
| size_t i = 0; |
| while (i < m_controllers.size()) { |
| if (!m_controllers[i]) { |
| m_controllers[i] = m_controllers.last(); |
| m_controllers.removeLast(); |
| } else { |
| ++i; |
| } |
| } |
| |
| m_needsPurge = false; |
| |
| if (m_controllers.isEmpty()) |
| stopListening(); |
| } |
| |
| } // namespace WebCore |