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      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 #include "DeviceOrientation.h"
     30 #include "DeviceOrientationClient.h"
     31 #include "DeviceOrientationEvent.h"
     32 
     33 namespace WebCore {
     34 
     35 DeviceOrientationController::DeviceOrientationController(Page* page, DeviceOrientationClient* client)
     36     : m_page(page)
     37     , m_client(client)
     38     , m_timer(this, &DeviceOrientationController::timerFired)
     39 {
     40     ASSERT(m_client);
     41     m_client->setController(this);
     42 }
     43 
     44 DeviceOrientationController::~DeviceOrientationController()
     45 {
     46     m_client->deviceOrientationControllerDestroyed();
     47 }
     48 
     49 void DeviceOrientationController::timerFired(Timer<DeviceOrientationController>* timer)
     50 {
     51     ASSERT_UNUSED(timer, timer == &m_timer);
     52     ASSERT(m_client->lastOrientation());
     53 
     54     RefPtr<DeviceOrientation> orientation = m_client->lastOrientation();
     55     RefPtr<DeviceOrientationEvent> event = DeviceOrientationEvent::create(eventNames().deviceorientationEvent, orientation.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 DeviceOrientationController::addListener(DOMWindow* window)
     65 {
     66     // If the client already has an orientation, we should fire an event with that
     67     // orientation. The event is fired asynchronously, but without
     68     // waiting for the client to get a new orientation.
     69     if (m_client->lastOrientation()) {
     70         m_newListeners.add(window);
     71         if (!m_timer.isActive())
     72             m_timer.startOneShot(0);
     73     }
     74 
     75     // The client must not call back synchronously.
     76     bool wasEmpty = m_listeners.isEmpty();
     77     m_listeners.add(window);
     78     if (wasEmpty)
     79         m_client->startUpdating();
     80 }
     81 
     82 void DeviceOrientationController::removeListener(DOMWindow* window)
     83 {
     84     m_listeners.remove(window);
     85     m_newListeners.remove(window);
     86     if (m_listeners.isEmpty())
     87         m_client->stopUpdating();
     88 }
     89 
     90 void DeviceOrientationController::removeAllListeners(DOMWindow* window)
     91 {
     92     // May be called with a DOMWindow that's not a listener.
     93     if (!m_listeners.contains(window))
     94         return;
     95 
     96     m_listeners.removeAll(window);
     97     m_newListeners.remove(window);
     98     if (m_listeners.isEmpty())
     99         m_client->stopUpdating();
    100 }
    101 
    102 void DeviceOrientationController::didChangeDeviceOrientation(DeviceOrientation* orientation)
    103 {
    104     RefPtr<DeviceOrientationEvent> event = DeviceOrientationEvent::create(eventNames().deviceorientationEvent, orientation);
    105     Vector<RefPtr<DOMWindow> > listenersVector;
    106     copyToVector(m_listeners, listenersVector);
    107     for (size_t i = 0; i < listenersVector.size(); ++i)
    108         listenersVector[i]->dispatchEvent(event);
    109 }
    110 
    111 } // namespace WebCore
    112