root/Source/modules/device_orientation/DeviceMotionDispatcher.cpp

DEFINITIONS

1. instance
2. addDeviceMotionController
3. removeDeviceMotionController
4. startListening
5. stopListening
6. didChangeDeviceMotion
7. latestDeviceMotionData

/*
 * 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,
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#include "config.h"
#include "modules/device_orientation/DeviceMotionDispatcher.h"

#include "modules/device_orientation/DeviceMotionController.h"
#include "modules/device_orientation/DeviceMotionData.h"
#include "public/platform/Platform.h"
#include "wtf/TemporaryChange.h"

namespace WebCore {

DeviceMotionDispatcher& DeviceMotionDispatcher::instance()
{
    DEFINE_STATIC_LOCAL(DeviceMotionDispatcher, deviceMotionDispatcher, ());
    return deviceMotionDispatcher;
}

DeviceMotionDispatcher::DeviceMotionDispatcher()
{
}

DeviceMotionDispatcher::~DeviceMotionDispatcher()
{
}

void DeviceMotionDispatcher::addDeviceMotionController(DeviceMotionController* controller)
{
    addController(controller);
}

void DeviceMotionDispatcher::removeDeviceMotionController(DeviceMotionController* controller)
{
    removeController(controller);
}

void DeviceMotionDispatcher::startListening()
{
    blink::Platform::current()->setDeviceMotionListener(this);
}

void DeviceMotionDispatcher::stopListening()
{
    blink::Platform::current()->setDeviceMotionListener(0);
    m_lastDeviceMotionData.clear();
}

void DeviceMotionDispatcher::didChangeDeviceMotion(const blink::WebDeviceMotionData& motion)
{
    m_lastDeviceMotionData = DeviceMotionData::create(motion);

    {
        TemporaryChange<bool> changeIsDispatching(m_isDispatching, true);
        // Don't fire controllers removed or added during event dispatch.
        size_t size = m_controllers.size();
        for (size_t i = 0; i < size; ++i) {
            if (m_controllers[i])
                static_cast<DeviceMotionController*>(m_controllers[i])->didChangeDeviceMotion(m_lastDeviceMotionData.get());
        }
    }

    if (m_needsPurge)
        purgeControllers();
}

DeviceMotionData* DeviceMotionDispatcher::latestDeviceMotionData()
{
    return m_lastDeviceMotionData.get();
}

} // namespace WebCore