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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 "modules/device_orientation/DeviceMotionDispatcher.h"
     33 
     34 #include "modules/device_orientation/DeviceMotionController.h"
     35 #include "modules/device_orientation/DeviceMotionData.h"
     36 #include "public/platform/Platform.h"
     37 #include "wtf/TemporaryChange.h"
     38 
     39 namespace WebCore {
     40 
     41 DeviceMotionDispatcher& DeviceMotionDispatcher::instance()
     42 {
     43     DEFINE_STATIC_LOCAL(DeviceMotionDispatcher, deviceMotionDispatcher, ());
     44     return deviceMotionDispatcher;
     45 }
     46 
     47 DeviceMotionDispatcher::DeviceMotionDispatcher()
     48 {
     49 }
     50 
     51 DeviceMotionDispatcher::~DeviceMotionDispatcher()
     52 {
     53 }
     54 
     55 void DeviceMotionDispatcher::addDeviceMotionController(DeviceMotionController* controller)
     56 {
     57     addController(controller);
     58 }
     59 
     60 void DeviceMotionDispatcher::removeDeviceMotionController(DeviceMotionController* controller)
     61 {
     62     removeController(controller);
     63 }
     64 
     65 void DeviceMotionDispatcher::startListening()
     66 {
     67     WebKit::Platform::current()->setDeviceMotionListener(this);
     68 }
     69 
     70 void DeviceMotionDispatcher::stopListening()
     71 {
     72     WebKit::Platform::current()->setDeviceMotionListener(0);
     73     m_lastDeviceMotionData.clear();
     74 }
     75 
     76 void DeviceMotionDispatcher::didChangeDeviceMotion(const WebKit::WebDeviceMotionData& motion)
     77 {
     78     m_lastDeviceMotionData = DeviceMotionData::create(motion);
     79 
     80     {
     81         TemporaryChange<bool> changeIsDispatching(m_isDispatching, true);
     82         // Don't fire controllers removed or added during event dispatch.
     83         size_t size = m_controllers.size();
     84         for (size_t i = 0; i < size; ++i) {
     85             if (m_controllers[i])
     86                 static_cast<DeviceMotionController*>(m_controllers[i])->didChangeDeviceMotion(m_lastDeviceMotionData.get());
     87         }
     88     }
     89 
     90     if (m_needsPurge)
     91         purgeControllers();
     92 }
     93 
     94 DeviceMotionData* DeviceMotionDispatcher::latestDeviceMotionData()
     95 {
     96     return m_lastDeviceMotionData.get();
     97 }
     98 
     99 } // namespace WebCore
    100