/*

 * Copyright 2010, The Android Open Source Project

 *

 * 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.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``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 "DeviceOrientationController.h"

#if ENABLE(DEVICE_ORIENTATION)

#include "DeviceOrientation.h"

#include "DeviceOrientationClient.h"

#include "DeviceOrientationEvent.h"

namespace WebCore {

DeviceOrientationController::DeviceOrientationController(Page* page, DeviceOrientationClient* client)

    : m_page(page)

    , m_client(client)

{

}

void DeviceOrientationController::addListener(DOMWindow* window)

{

    // If no client is present, signal that no orientation data is available.

    // If the client already has an orientation, call back to this new listener

    // immediately.

    if (!m_client) {

        RefPtr<DeviceOrientation> emptyOrientation = DeviceOrientation::create();

        window->dispatchEvent(DeviceOrientationEvent::create(eventNames().deviceorientationEvent, emptyOrientation.get()));

    } else if (m_client && m_client->lastOrientation())

        window->dispatchEvent(DeviceOrientationEvent::create(eventNames().deviceorientationEvent, m_client->lastOrientation()));

    // The client may call back synchronously.

    bool wasEmpty = m_listeners.isEmpty();

    m_listeners.add(window);

    if (wasEmpty && m_client)

        m_client->startUpdating();

}

void DeviceOrientationController::removeListener(DOMWindow* window)

{

    m_listeners.remove(window);

    if (m_listeners.isEmpty() && m_client)

        m_client->stopUpdating();

}

void DeviceOrientationController::removeAllListeners(DOMWindow* window)

{

    // May be called with a DOMWindow that's not a listener.

    if (!m_listeners.contains(window))

        return;

    m_listeners.removeAll(window);

    if (m_listeners.isEmpty() && m_client)

        m_client->stopUpdating();

}

void DeviceOrientationController::didChangeDeviceOrientation(DeviceOrientation* orientation)

{

    RefPtr<DeviceOrientationEvent> event = DeviceOrientationEvent::create(eventNames().deviceorientationEvent, orientation);

    Vector<DOMWindow*> listenersVector;

    copyToVector(m_listeners, listenersVector);

    for (size_t i = 0; i < listenersVector.size(); ++i)

        listenersVector[i]->dispatchEvent(event);

}

} // namespace WebCore

#endif // ENABLE(DEVICE_ORIENTATION)