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      1 /*
      2  * Copyright 2010 Apple 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
      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 "DeviceMotionController.h"
     28 
     29 #include "DeviceMotionClient.h"
     30 #include "DeviceMotionData.h"
     31 #include "DeviceMotionEvent.h"
     32 
     33 namespace WebCore {
     34 
     35 DeviceMotionController::DeviceMotionController(DeviceMotionClient* client)
     36     : m_client(client)
     37     , m_timer(this, &DeviceMotionController::timerFired)
     38 {
     39     ASSERT(m_client);
     40     m_client->setController(this);
     41 }
     42 
     43 DeviceMotionController::~DeviceMotionController()
     44 {
     45     m_client->deviceMotionControllerDestroyed();
     46 }
     47 
     48 void DeviceMotionController::timerFired(Timer<DeviceMotionController>* timer)
     49 {
     50     ASSERT_UNUSED(timer, timer == &m_timer);
     51     ASSERT(!m_client || m_client->currentDeviceMotion());
     52     m_timer.stop();
     53 
     54     RefPtr<DeviceMotionData> deviceMotionData = m_client ? m_client->currentDeviceMotion() : DeviceMotionData::create();
     55     RefPtr<DeviceMotionEvent> event = DeviceMotionEvent::create(eventNames().devicemotionEvent, deviceMotionData.get());
     56 
     57     Vector<RefPtr<DOMWindow> > listenersVector;
     58     copyToVector(m_newListeners, listenersVector);
     59     m_newListeners.clear();
     60     for (size_t i = 0; i < listenersVector.size(); ++i)
     61         listenersVector[i]->dispatchEvent(event);
     62 }
     63 
     64 void DeviceMotionController::addListener(DOMWindow* window)
     65 {
     66     // If no client is present or the client already has motion data,
     67     // immediately trigger an asynchronous response.
     68     if (!m_client || m_client->currentDeviceMotion()) {
     69         m_newListeners.add(window);
     70         if (!m_timer.isActive())
     71             m_timer.startOneShot(0);
     72     }
     73 
     74     bool wasEmpty = m_listeners.isEmpty();
     75     m_listeners.add(window);
     76     if (wasEmpty && m_client)
     77         m_client->startUpdating();
     78 }
     79 
     80 void DeviceMotionController::removeListener(DOMWindow* window)
     81 {
     82     m_listeners.remove(window);
     83     m_newListeners.remove(window);
     84     if (m_listeners.isEmpty() && m_client)
     85         m_client->stopUpdating();
     86 }
     87 
     88 void DeviceMotionController::removeAllListeners(DOMWindow* window)
     89 {
     90     // May be called with a DOMWindow that's not a listener.
     91     if (!m_listeners.contains(window))
     92         return;
     93 
     94     m_listeners.removeAll(window);
     95     m_newListeners.remove(window);
     96     if (m_listeners.isEmpty() && m_client)
     97         m_client->stopUpdating();
     98 }
     99 
    100 void DeviceMotionController::didChangeDeviceMotion(DeviceMotionData* deviceMotionData)
    101 {
    102     RefPtr<DeviceMotionEvent> event = DeviceMotionEvent::create(eventNames().devicemotionEvent, deviceMotionData);
    103     Vector<RefPtr<DOMWindow> > listenersVector;
    104     copyToVector(m_listeners, listenersVector);
    105     for (size_t i = 0; i < listenersVector.size(); ++i)
    106         listenersVector[i]->dispatchEvent(event);
    107 }
    108 
    109 } // namespace WebCore
    110