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

Source/WebCore/dom/DeviceMotionController.cpp

 /*
- * Copyright 2010 Apple Inc. All rights reserved.
- * Copyright (C) 2012 Samsung Electronics. All rights reserved.
+ * Copyright (C) 2013 Google Inc. 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.
+ * modification, are permitted provided that the following conditions are
+ * met:
  *
- * 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
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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.
  */

[Peter Beverloo, 2013/04/09 17:29:53]

We can't just change the copyright header if Apple or Samsung added this file. 
Best to leave it untouched.

[timvolodine, 2013/04/10 19:06:12]

Done.

 
 #include "config.h"
 #include "DeviceMotionController.h"
 
-#include "DeviceMotionClient.h"
 #include "DeviceMotionData.h"
 #include "DeviceMotionEvent.h"
 #include "Page.h"
 
+#include "PlatformDeviceMotion.h"
+
 namespace WebCore {
 
-DeviceMotionController::DeviceMotionController(DeviceMotionClient* client)
-    : DeviceController(client)
+DeviceMotionController::DeviceMotionController() : DeviceController()
 {
-    ASSERT(m_client);
-    deviceMotionClient()->setController(this);
 }
 
-PassOwnPtr<DeviceMotionController> DeviceMotionController::create(DeviceMotionClient* client)
+DeviceMotionController& DeviceMotionController::shared()

[Peter Beverloo, 2013/04/09 17:29:53]

While not that common in WebKit (yet), I'd prefer it if we can add a comment
above this method which says "// static".

[timvolodine, 2013/04/10 19:06:12]

Done.

 {
-    return adoptPtr(new DeviceMotionController(client));
+    DEFINE_STATIC_LOCAL(DeviceMotionController, deviceMotionController, ());
+    return deviceMotionController;
 }
 
 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 lastDeviceMotionData();

[Peter Beverloo, 2013/04/09 17:29:53]

Where does lastDeviceMotionData come from?

[timvolodine, 2013/04/10 19:06:12]

if I understand the question correctly:
from the platform layer as implement in
WebCore/platform/chromium/DeviceMotion.cpp

 }
 
 PassRefPtr<Event> DeviceMotionController::getLastEvent()
 {
-    return DeviceMotionEvent::create(eventNames().devicemotionEvent, deviceMotionClient()->lastMotion());
+    return DeviceMotionEvent::create(eventNames().devicemotionEvent, lastDeviceMotionData());

[Peter Beverloo, 2013/04/09 17:29:53]

dito to line 59.

[timvolodine, 2013/04/10 19:06:12]

Done.

 }
 
-const char* DeviceMotionController::supplementName()
+
+void DeviceMotionController::addDeviceEventListener(DOMWindow* window)
 {
-    return "DeviceMotionController";
+    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();

[Peter Beverloo, 2013/04/09 17:29:53]

Unless we need to publicly expose startUpdating/stopUpdating from this class, we
may as well call to {start,stop}MonitoringDeviceMotion() directly here.

[timvolodine, 2013/04/10 19:06:12]

we don't need start/stop to be public, I've kept them here in order to be able
to easily generalize later and move the addDeviceEventListener to a super class.

 }
 
-DeviceMotionController* DeviceMotionController::from(Page* page)
+void DeviceMotionController::removeDeviceEventListener(DOMWindow* window)
 {
-    return static_cast<DeviceMotionController*>(Supplement<Page>::from(page, supplementName()));
+    m_listeners.remove(window);
+    m_activePages.remove(window->page());
+    m_lastEventListeners.remove(window);
+    if (m_listeners.isEmpty())
+        stopUpdating();
 }
 
-bool DeviceMotionController::isActiveAt(Page* page)
+void DeviceMotionController::removeAllDeviceEventListeners(DOMWindow* window)
 {
-    if (DeviceMotionController* self = DeviceMotionController::from(page))
-        return self->isActive();
-    return false;
+    m_listeners.removeAll(window);
+    m_activePages.removeAll(window->page());
+    m_lastEventListeners.removeAll(window);
+    if (m_listeners.isEmpty())
+        stopUpdating();
 }
 
-void provideDeviceMotionTo(Page* page, DeviceMotionClient* client)
+void DeviceMotionController::startUpdating()
 {
-    DeviceMotionController::provideTo(page, DeviceMotionController::supplementName(), DeviceMotionController::create(client));
+    startMonitoringDeviceMotion();
+}
+
+void DeviceMotionController::stopUpdating()
+{
+    stopMonitoringDeviceMotion();
 }
 
 } // namespace WebCore