WebKit & WebCore part of the device motion implementation using the platform layer.

Source/WebCore/dom/DeviceMotionController.cpp

 /*
- * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright 2010 Apple Inc. All rights reserved.
+ * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
+ * 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.
  *
- *     * 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.
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- * 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
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
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+ * 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 "DeviceMotionController.h"
 
 #include "DeviceMotionData.h"
 #include "DeviceMotionEvent.h"
+#include "Document.h"
 #include "Page.h"
-
 #include "PlatformDeviceMotion.h"
 
 namespace WebCore {
 
-DeviceMotionController::DeviceMotionController() : DeviceController()
+PassRefPtr<DeviceMotionController> DeviceMotionController::create()
 {
+    return adoptRef(new DeviceMotionController());
 }
 
-DeviceMotionController& DeviceMotionController::shared()
-{
-    DEFINE_STATIC_LOCAL(DeviceMotionController, deviceMotionController, ());
-    return deviceMotionController;
+DeviceMotionController::~DeviceMotionController() {
+    // this is a noop if the controller is not registered for updates.

[Peter Beverloo, 2013/04/17 19:08:23]

nit: "This is a no-op if the controller has not registered with the Device
Motion pump"?

[timvolodine, 2013/04/18 12:37:38]

Done.

+    unRegisterForDeviceMotionUpdates(this);

[Peter Beverloo, 2013/04/17 19:08:23]

"Unregister" is one word, so no need to capitalize the "R".

[timvolodine, 2013/04/18 12:37:38]

Done.

 }
 
 void DeviceMotionController::didChangeDeviceMotion(DeviceMotionData* deviceMotionData)
 {
     dispatchDeviceEvent(DeviceMotionEvent::create(eventNames().devicemotionEvent, deviceMotionData));
 }
 
 bool DeviceMotionController::hasLastData()
 {
-    return lastDeviceMotionData();
+    return latestDeviceMotionData();
 }
 
 PassRefPtr<Event> DeviceMotionController::getLastEvent()
 {
-    return DeviceMotionEvent::create(eventNames().devicemotionEvent, lastDeviceMotionData());
+    return DeviceMotionEvent::create(eventNames().devicemotionEvent, latestDeviceMotionData());
 }
 
-
 void DeviceMotionController::addDeviceEventListener(DOMWindow* window)
 {
     bool wasEmpty = m_listeners.isEmpty();
     m_listeners.add(window);
-    m_activePages.add(window->page());
 
     if (hasLastData()) {
         m_lastEventListeners.add(window);
         if (!m_timer.isActive())
             m_timer.startOneShot(0);
     }
 
     if (wasEmpty)
         startUpdating();
 }
 
 void DeviceMotionController::removeDeviceEventListener(DOMWindow* window)
 {
     m_listeners.remove(window);
-    m_activePages.remove(window->page());
     m_lastEventListeners.remove(window);
     if (m_listeners.isEmpty())
         stopUpdating();
 }
 
 void DeviceMotionController::removeAllDeviceEventListeners(DOMWindow* window)
 {
     m_listeners.removeAll(window);
-    m_activePages.removeAll(window->page());
     m_lastEventListeners.removeAll(window);
     if (m_listeners.isEmpty())
         stopUpdating();
 }
 
+void DeviceMotionController::dispatchDeviceEvent(PassRefPtr<Event> prpEvent)

[Peter Beverloo, 2013/04/17 19:08:23]

Please don't use acronyms and spell out the "prpEvent" name.

[timvolodine, 2013/04/18 12:37:38]

I believe this is a guideline from WebKit on how to prefix the PassRefPtr
parameters.

[Peter Beverloo, 2013/04/18 13:56:06]

Since you store it in a normal RefPtr on line 96 it doesn't matter anyway. Feel
free to divert.

[timvolodine, 2013/04/18 14:55:37]

Done.

+{
+    RefPtr<Event> event = prpEvent;
+    Vector<RefPtr<DOMWindow> > listenerVector;
+    copyToVector(m_listeners, listenerVector);
+    for (size_t i = 0; i < listenerVector.size(); ++i) {
+        if (listenerVector[i]->document()
+            && !listenerVector[i]->document()->activeDOMObjectsAreSuspended()

[eseidel, 2013/04/17 01:51:16]

When are active dom objects stopped?

[timvolodine, 2013/04/17 17:47:25]

What I can see from the code the three reasons to suspend active DOM objects
are: JavaScriptDebuggerPaused, WillDeferLoading, DocumentWillBecomeInactive.
WillDeferLoading seems to be used to avoid execution of JS code when a modal
window is displayed. DocumentWillBecomeInactive appears to be used when caching
a page.

+            && !listenerVector[i]->document()->activeDOMObjectsAreStopped())
+        listenerVector[i]->dispatchEvent(event);
+    }
+}
+
+void DeviceMotionController::fireDeviceEvent(Timer<DeviceMotionController>* timer)
+{
+    ASSERT_UNUSED(timer, timer == &m_timer);
+    ASSERT(hasLastData());
+
+    m_timer.stop();
+    Vector<RefPtr<DOMWindow> > listenerVector;
+    copyToVector(m_lastEventListeners, listenerVector);
+    m_lastEventListeners.clear();
+    for (size_t i = 0; i < listenerVector.size(); ++i) {
+        if (listenerVector[i]->document()
+            && !listenerVector[i]->document()->activeDOMObjectsAreSuspended()
+            && !listenerVector[i]->document()->activeDOMObjectsAreStopped())
+        listenerVector[i]->dispatchEvent(getLastEvent());

[Peter Beverloo, 2013/04/17 19:08:23]

Since we have two paths for dispatching events, does it make sense to create a
private dispatchEventToActiveDocuments method?

[timvolodine, 2013/04/18 12:37:38]

Done.

+    }
+}
+
+const char* DeviceMotionController::supplementName()
+{
+    return "DeviceMotionController";
+}
+
+DeviceMotionController* DeviceMotionController::from(Page* page)
+{
+    return static_cast<DeviceMotionController*>(RefCountedSupplement<Page, DeviceMotionController>::from(page, supplementName()));
+}
+
+bool DeviceMotionController::isActiveAt(Page* page)
+{
+    if (DeviceMotionController* self = DeviceMotionController::from(page))
+        return self->isActive();
+    return false;
+}
+
 void DeviceMotionController::startUpdating()
 {
-    startMonitoringDeviceMotion();
+    registerForDeviceMotionUpdates(this);
 }
 
 void DeviceMotionController::stopUpdating()
 {
-    stopMonitoringDeviceMotion();
+    unRegisterForDeviceMotionUpdates(this);
+}
+
+void provideDeviceMotionTo(Page* page)
+{
+    DeviceMotionController::provideTo(page, DeviceMotionController::supplementName(), DeviceMotionController::create());
 }
 
 } // namespace WebCore