content/browser/device_orientation/observer_delegate.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_DEVICE_ORIENTATION_OBSERVER_DELEGATE_H_
   6 #define CONTENT_BROWSER_DEVICE_ORIENTATION_OBSERVER_DELEGATE_H_
   7
   8 #include "content/browser/device_orientation/device_data.h"
   9 #include "content/browser/device_orientation/provider.h"
  10
  11 namespace IPC {
  12 class Sender;
  13 }
  14
  15 namespace content {
  16
  17 class ObserverDelegate
  18     : public base::RefCounted<ObserverDelegate>, public Provider::Observer {
  19  public:
  20   // Create ObserverDelegate that observes provider and forwards updates to
  21   // render_view_id.
  22   // Will stop observing provider when destructed.
  23   ObserverDelegate(DeviceData::Type device_data_type, Provider* provider,
  24                    int render_view_id, IPC::Sender* sender);
  25
  26   // From Provider::Observer.
  27   virtual void OnDeviceDataUpdate(const DeviceData* device_data,
  28                                   DeviceData::Type device_data_type) OVERRIDE;
  29
  30  private:
  31   static DeviceData* EmptyDeviceData(DeviceData::Type type);
  32
  33   friend class base::RefCounted<ObserverDelegate>;
  34   virtual ~ObserverDelegate();
  35
  36   scoped_refptr<Provider> provider_;
  37   int render_view_id_;
  38   IPC::Sender* sender_;  // Weak pointer.
  39
  40   DISALLOW_COPY_AND_ASSIGN(ObserverDelegate);
  41 };
  42
  43 }  // namespace content
  44
  45 #endif  // CONTENT_BROWSER_DEVICE_ORIENTATION_OBSERVER_DELEGATE_H_