chrome/browser/media/native_desktop_media_list.h

   1 // Copyright 2013 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_NATIVE_DESKTOP_MEDIA_LIST_H_
   6 #define CHROME_BROWSER_MEDIA_NATIVE_DESKTOP_MEDIA_LIST_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/memory/weak_ptr.h"
  11 #include "base/sequenced_task_runner.h"
  12 #include "chrome/browser/media/desktop_media_list.h"
  13 #include "content/public/browser/desktop_media_id.h"
  14 #include "ui/gfx/image/image_skia.h"
  15
  16 namespace webrtc {
  17 class ScreenCapturer;
  18 class WindowCapturer;
  19 }
  20
  21 // Implementation of DesktopMediaList that shows native screens and
  22 // native windows.
  23 class NativeDesktopMediaList : public DesktopMediaList {
  24  public:
  25   // Caller may pass NULL for either of the arguments in case when only some
  26   // types of sources the model should be populated with (e.g. it will only
  27   // contain windows, if |screen_capturer| is NULL).
  28   NativeDesktopMediaList(
  29       scoped_ptr<webrtc::ScreenCapturer> screen_capturer,
  30       scoped_ptr<webrtc::WindowCapturer> window_capturer);
  31   virtual ~NativeDesktopMediaList();
  32
  33   // DesktopMediaList interface.
  34   virtual void SetUpdatePeriod(base::TimeDelta period) OVERRIDE;
  35   virtual void SetThumbnailSize(const gfx::Size& thumbnail_size) OVERRIDE;
  36   virtual void StartUpdating(DesktopMediaListObserver* observer) OVERRIDE;
  37   virtual int GetSourceCount() const OVERRIDE;
  38   virtual const Source& GetSource(int index) const OVERRIDE;
  39   virtual void SetViewDialogWindowId(
  40       content::DesktopMediaID::Id dialog_id) OVERRIDE;
  41
  42  private:
  43   class Worker;
  44   friend class Worker;
  45
  46   // Struct used to represent sources list the model gets from the Worker.
  47   struct SourceDescription {
  48     SourceDescription(content::DesktopMediaID id, const base::string16& name);
  49
  50     content::DesktopMediaID id;
  51     base::string16 name;
  52   };
  53
  54   // Order comparator for sources. Used to sort list of sources.
  55   static bool CompareSources(const SourceDescription& a,
  56                              const SourceDescription& b);
  57
  58   // Post a task for the |worker_| to update list of windows and get thumbnails.
  59   void Refresh();
  60
  61   // Called by |worker_| to refresh the model. First it posts tasks for
  62   // OnSourcesList() with the fresh list of sources, then follows with
  63   // OnSourceThumbnail() for each changed thumbnail and then calls
  64   // OnRefreshFinished() at the end.
  65   void OnSourcesList(const std::vector<SourceDescription>& sources);
  66   void OnSourceThumbnail(int index, const gfx::ImageSkia& thumbnail);
  67   void OnRefreshFinished();
  68
  69   // Capturers specified in SetCapturers() and passed to the |worker_| later.
  70   scoped_ptr<webrtc::ScreenCapturer> screen_capturer_;
  71   scoped_ptr<webrtc::WindowCapturer> window_capturer_;
  72
  73   // Time interval between mode updates.
  74   base::TimeDelta update_period_;
  75
  76   // Size of thumbnails generated by the model.
  77   gfx::Size thumbnail_size_;
  78
  79   // ID of the hosting dialog.
  80   content::DesktopMediaID::Id view_dialog_id_;
  81
  82   // The observer passed to StartUpdating().
  83   DesktopMediaListObserver* observer_;
  84
  85   // Task runner used for the |worker_|.
  86   scoped_refptr<base::SequencedTaskRunner> capture_task_runner_;
  87
  88   // An object that does all the work of getting list of sources on a background
  89   // thread (see |capture_task_runner_|). Destroyed on |capture_task_runner_|
  90   // after the model is destroyed.
  91   scoped_ptr<Worker> worker_;
  92
  93   // Current list of sources.
  94   std::vector<Source> sources_;
  95
  96   base::WeakPtrFactory<NativeDesktopMediaList> weak_factory_;
  97
  98   DISALLOW_COPY_AND_ASSIGN(NativeDesktopMediaList);
  99 };
 100
 101 #endif  // CHROME_BROWSER_MEDIA_NATIVE_DESKTOP_MEDIA_LIST_H_