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

Source/WebCore/dom/DeviceMotionController.h

 /*
- * 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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- * contributors may be used to endorse or promote products derived from
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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
+ * 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.
  */
 
 #ifndef DeviceMotionController_h
 #define DeviceMotionController_h
 
-#include "DeviceController.h"
+#include "DOMWindow.h"
+#include "Event.h"
+#include "RefCountedSupplement.h"
+#include "Timer.h"
+#include <wtf/HashCountedSet.h>
 
 namespace WebCore {
 
 class DeviceMotionData;
 
-class DeviceMotionController : public DeviceController {
+// FIXME: This class doesn't inherit from DeviceController anymore, which is a temporary
+// solution. Once the device orientation switches to the client-less design, move some of the
+// methods in this class to the DeviceController.
+class DeviceMotionController : public RefCountedSupplement<Page, DeviceMotionController> {
+
 public:
-    virtual ~DeviceMotionController() { };
+    virtual ~DeviceMotionController();
 
-    static DeviceMotionController& shared();
+    static PassRefPtr<DeviceMotionController> create();
 
     void didChangeDeviceMotion(DeviceMotionData*);
 
-    virtual bool hasLastData() OVERRIDE;
-    virtual PassRefPtr<Event> getLastEvent() OVERRIDE;
-    bool isActiveAt(Page* page) { return m_activePages.contains(page); }
+    virtual bool hasLastData();
+    virtual PassRefPtr<Event> getLastEvent();
 
-    virtual void startUpdating();
-    virtual void stopUpdating();
+    static const char* supplementName();
+    static DeviceMotionController* from(Page*);
+    static bool isActiveAt(Page*);
 
-// -------------------------------------------------
+    // FIXME move these methods to DeviceController
+    void dispatchDeviceEvent(const PassRefPtr<Event>);
+    bool isActive() { return !m_listeners.isEmpty(); }
 
-    void addDeviceEventListener(DOMWindow*) OVERRIDE;
-    void removeDeviceEventListener(DOMWindow*) OVERRIDE;
-    void removeAllDeviceEventListeners(DOMWindow*) OVERRIDE;
+    virtual void addDeviceEventListener(DOMWindow*);
+    virtual void removeDeviceEventListener(DOMWindow*);
+    virtual void removeAllDeviceEventListeners(DOMWindow*);
 
-//    void dispatchDeviceEvent(PassRefPtr<Event>);
-//    bool isActive() { return !m_listeners.isEmpty(); }
-//    DeviceClient* client() { return m_client; }
+private:
+    DeviceMotionController() : m_timer(this, &DeviceMotionController::fireDeviceEvent) { }
 
-protected:
-    DeviceMotionController();
-    HashCountedSet<Page*> m_activePages;
+    void startUpdating();
+    void stopUpdating();
+    void fireDeviceEvent(Timer<DeviceMotionController>*);
+    void dispatchEventToActiveDocuments(Vector<RefPtr<DOMWindow> >&, const PassRefPtr<Event>);
+
+    HashCountedSet<RefPtr<DOMWindow> > m_listeners;

[eseidel, 2013/04/23 15:21:24]

Confused why this would want to keep a ref-counted list of DOMWindows.  Doens't
DOMWindow control its presence on this list?

[timvolodine, 2013/04/23 18:10:40]

This is how it is done in the original DeviceController.

+    HashCountedSet<RefPtr<DOMWindow> > m_lastEventListeners;
+    Timer<DeviceMotionController> m_timer;
 };
 
+void provideDeviceMotionTo(Page*);
+
 } // namespace WebCore
 
 #endif // DeviceMotionController_h