1 /*

     2  * Copyright 2010, The Android Open Source Project

     3  *

     4  * Redistribution and use in source and binary forms, with or without

     5  * modification, are permitted provided that the following conditions

     6  * are met:

     7  *  * Redistributions of source code must retain the above copyright

     8  *    notice, this list of conditions and the following disclaimer.

     9  *  * Redistributions in binary form must reproduce the above copyright

    10  *    notice, this list of conditions and the following disclaimer in the

    11  *    documentation and/or other materials provided with the distribution.

    12  *

    13  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY

    14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

    15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

    16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR

    17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

    18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

    19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

    20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

    21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

    22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

    23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    24  */

    25 

    26 #include "config.h"

    27 #include "DeviceOrientationController.h"

    28 

    29 #if ENABLE(DEVICE_ORIENTATION)

    30 

    31 #include "DeviceOrientation.h"

    32 #include "DeviceOrientationClient.h"

    33 #include "DeviceOrientationEvent.h"

    34 

    35 namespace WebCore {

    36 

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

    38     : m_page(page)

    39     , m_client(client)

    40 {

    41 }

    42 

    43 void DeviceOrientationController::addListener(DOMWindow* window)

    44 {

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

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

    47     // immediately.

    48     if (!m_client) {

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

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

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

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

    53 

    54     // The client may call back synchronously.

    55     bool wasEmpty = m_listeners.isEmpty();

    56     m_listeners.add(window);

    57     if (wasEmpty && m_client)

    58         m_client->startUpdating();

    59 }

    60 

    61 void DeviceOrientationController::removeListener(DOMWindow* window)

    62 {

    63     m_listeners.remove(window);

    64     if (m_listeners.isEmpty() && m_client)

    65         m_client->stopUpdating();

    66 }

    67 

    68 void DeviceOrientationController::removeAllListeners(DOMWindow* window)

    69 {

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

    71     if (!m_listeners.contains(window))

    72         return;

    73 

    74     m_listeners.removeAll(window);

    75     if (m_listeners.isEmpty() && m_client)

    76         m_client->stopUpdating();

    77 }

    78 

    79 void DeviceOrientationController::didChangeDeviceOrientation(DeviceOrientation* orientation)

    80 {

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

    82     Vector<DOMWindow*> listenersVector;

    83     copyToVector(m_listeners, listenersVector);

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

    85         listenersVector[i]->dispatchEvent(event);

    86 }

    87 

    88 } // namespace WebCore

    89 

    90 #endif // ENABLE(DEVICE_ORIENTATION)