Implement the Blink part of the Device Motion API.

Source/modules/device_orientation/DeviceMotionController.cpp

 /*
  * 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:
  *  * 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 "modules/device_orientation/DeviceMotionController.h"
 
-#include "modules/device_orientation/DeviceMotionClient.h"
+#include "core/dom/Document.h"
+#include "core/page/DOMWindow.h"
 #include "modules/device_orientation/DeviceMotionData.h"
 #include "modules/device_orientation/DeviceMotionEvent.h"
-#include "core/page/Page.h"
+#include "modules/device_orientation/WebDeviceMotionDispatcher.h"
 
 namespace WebCore {
 
-DeviceMotionController::DeviceMotionController(DeviceMotionClient* client)
-    : DeviceController(client)
+DeviceMotionController::DeviceMotionController(Document* document)
+    : m_document(document),
+      m_isActive(false),
+      m_timer(this, &DeviceMotionController::fireDeviceEvent)

[abarth-chromium, 2013/05/07 16:43:47]

Blink style is to put the ","s aligned vertically below the ":".

[timvolodine, 2013/05/07 19:02:30]

Done.

 {
-    ASSERT(m_client);
-    deviceMotionClient()->setController(this);
 }
 
-PassOwnPtr<DeviceMotionController> DeviceMotionController::create(DeviceMotionClient* client)
+DeviceMotionController::~DeviceMotionController()
 {
-    return adoptPtr(new DeviceMotionController(client));
+    stopUpdating();
 }
 
 void DeviceMotionController::didChangeDeviceMotion(DeviceMotionData* deviceMotionData)
 {
     dispatchDeviceEvent(DeviceMotionEvent::create(eventNames().devicemotionEvent, deviceMotionData));
 }
 
-DeviceMotionClient* DeviceMotionController::deviceMotionClient()
-{
-    return static_cast<DeviceMotionClient*>(m_client);
-}
-
 bool DeviceMotionController::hasLastData()
 {
-    return deviceMotionClient()->lastMotion();
+    return WebKit::WebDeviceMotionDispatcher::shared().latestDeviceMotionData();
 }
 
 PassRefPtr<Event> DeviceMotionController::getLastEvent()
 {
-    return DeviceMotionEvent::create(eventNames().devicemotionEvent, deviceMotionClient()->lastMotion());
+    return DeviceMotionEvent::create(eventNames().devicemotionEvent,
+        WebKit::WebDeviceMotionDispatcher::shared().latestDeviceMotionData());
+}
+
+void DeviceMotionController::fireDeviceEvent(Timer<DeviceMotionController>* timer)
+{
+    ASSERT_UNUSED(timer, timer == &m_timer);
+    ASSERT(hasLastData());
+
+    m_timer.stop();
+    dispatchDeviceEvent(getLastEvent());
+}
+
+void DeviceMotionController::dispatchDeviceEvent(const PassRefPtr<Event> prpEvent)
+{
+    RefPtr<Event> event = prpEvent;
+    if (m_document
+        && m_document->domWindow()
+        && !m_document->activeDOMObjectsAreSuspended()
+        && !m_document->activeDOMObjectsAreStopped())
+            m_document->domWindow()->dispatchEvent(event);

[abarth-chromium, 2013/05/07 16:43:47]

four-space indent please.

[timvolodine, 2013/05/07 19:02:30]

? it is a four-space indent..

 }
 
 const char* DeviceMotionController::supplementName()
 {
     return "DeviceMotionController";
 }
 
-DeviceMotionController* DeviceMotionController::from(Page* page)
+DeviceMotionController* DeviceMotionController::from(Document* document)
 {
-    return static_cast<DeviceMotionController*>(Supplement<Page>::from(page, supplementName()));
+    DeviceMotionController* controller = static_cast<DeviceMotionController*>(RefCountedSupplement<ScriptExecutionContext, DeviceMotionController>::from(document, supplementName()));
+    if (!controller) {
+        controller = new DeviceMotionController(document);
+        RefCountedSupplement<ScriptExecutionContext, DeviceMotionController>::provideTo(document, supplementName(), adoptRef(controller));
+    }
+    return controller;
 }
 
-bool DeviceMotionController::isActiveAt(Page* page)
+void DeviceMotionController::startUpdating()
 {
-    if (DeviceMotionController* self = DeviceMotionController::from(page))
-        return self->isActive();
-    return false;
+    if (!m_isActive) {
+        WebKit::WebDeviceMotionDispatcher::shared().addController(this);
+        m_isActive = true;
+
+        if (hasLastData() && !m_timer.isActive())
+            // make sure to fire the motion data asap.
+            m_timer.startOneShot(0);
+    }
 }
 
-void provideDeviceMotionTo(Page* page, DeviceMotionClient* client)
+void DeviceMotionController::stopUpdating()
 {
-    DeviceMotionController::provideTo(page, DeviceMotionController::supplementName(), DeviceMotionController::create(client));
+    if (m_isActive) {
+        WebKit::WebDeviceMotionDispatcher::shared().removeController(this);
+        m_isActive = false;
+    }
 }
 
 } // namespace WebCore