chrome/browser/media/router/presentation_media_sinks_observer.h

   1 // Copyright 2015 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 CHROME_BROWSER_MEDIA_ROUTER_PRESENTATION_MEDIA_SINKS_OBSERVER_H_
   6 #define CHROME_BROWSER_MEDIA_ROUTER_PRESENTATION_MEDIA_SINKS_OBSERVER_H_
   7
   8 #include "base/macros.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "chrome/browser/media/router/media_sinks_observer.h"
  11 #include "content/public/browser/presentation_service_delegate.h"
  12
  13 namespace content {
  14 class PresentationScreenAvailabilityListener;
  15 }
  16
  17 namespace media_router {
  18
  19 class MediaRouter;
  20 class MediaSource;
  21
  22 // Receives SinkQueryResults for |source| from |router| and propagates results
  23 // to |listener|. |listener| is notified only when availability status has
  24 // changed, i.e. sinks have become available or sinks are no longer available.
  25 class PresentationMediaSinksObserver : public MediaSinksObserver {
  26  public:
  27   // |router|: Media router that publishes sink query results.
  28   // |listener|: Notified when sinks availability changes.
  29   // |source|: Filters available sink.
  30   // Does not take ownership of |listener| or |router|.
  31   PresentationMediaSinksObserver(
  32       MediaRouter* router,
  33       content::PresentationScreenAvailabilityListener* listener,
  34       const MediaSource& source);
  35   ~PresentationMediaSinksObserver() override;
  36
  37   // MediaSinksObserver implementation.
  38   void OnSinksReceived(const std::vector<MediaSink>& result) override;
  39
  40   content::PresentationScreenAvailabilityListener* listener() const {
  41     return listener_;
  42   }
  43
  44  private:
  45   enum Availability { UNKNOWN, AVAILABLE, UNAVAILABLE };
  46
  47   content::PresentationScreenAvailabilityListener* listener_;
  48   Availability previous_availablity_;
  49
  50   DISALLOW_COPY_AND_ASSIGN(PresentationMediaSinksObserver);
  51 };
  52
  53 }  // namespace media_router
  54
  55 #endif  // CHROME_BROWSER_MEDIA_ROUTER_PRESENTATION_MEDIA_SINKS_OBSERVER_H_