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   ~NativeDesktopMediaList() override;
  32
  33   // DesktopMediaList interface.
  34   void SetUpdatePeriod(base::TimeDelta period) override;
  35   void SetThumbnailSize(const gfx::Size& thumbnail_size) override;
  36   void StartUpdating(DesktopMediaListObserver* observer) override;
  37   int GetSourceCount() const override;
  38   const Source& GetSource(int index) const override;
  39   void SetViewDialogWindowId(content::DesktopMediaID dialog_id) override;
  40
  41  private:
  42   class Worker;
  43   friend class Worker;
  44
  45   // Struct used to represent sources list the model gets from the Worker.
  46   struct SourceDescription {
  47     SourceDescription(content::DesktopMediaID id, const base::string16& name);
  48
  49     content::DesktopMediaID id;
  50     base::string16 name;
  51   };
  52
  53   // Order comparator for sources. Used to sort list of sources.
  54   static bool CompareSources(const SourceDescription& a,
  55                              const SourceDescription& b);
  56
  57   // Post a task for the |worker_| to update list of windows and get thumbnails.
  58   void Refresh();
  59
  60   // Called by |worker_| to refresh the model. First it posts tasks for
  61   // OnSourcesList() with the fresh list of sources, then follows with
  62   // OnSourceThumbnail() for each changed thumbnail and then calls
  63   // OnRefreshFinished() at the end.
  64   void OnSourcesList(const std::vector<SourceDescription>& sources);
  65   void OnSourceThumbnail(int index, const gfx::ImageSkia& thumbnail);
  66   void OnRefreshFinished();
  67
  68   // Capturers specified in SetCapturers() and passed to the |worker_| later.
  69   scoped_ptr<webrtc::ScreenCapturer> screen_capturer_;
  70   scoped_ptr<webrtc::WindowCapturer> window_capturer_;
  71
  72   // Time interval between mode updates.
  73   base::TimeDelta update_period_;
  74
  75   // Size of thumbnails generated by the model.
  76   gfx::Size thumbnail_size_;
  77
  78   // ID of the hosting dialog.
  79   content::DesktopMediaID view_dialog_id_;
  80
  81   // The observer passed to StartUpdating().
  82   DesktopMediaListObserver* observer_;
  83
  84   // Task runner used for the |worker_|.
  85   scoped_refptr<base::SequencedTaskRunner> capture_task_runner_;
  86
  87   // An object that does all the work of getting list of sources on a background
  88   // thread (see |capture_task_runner_|). Destroyed on |capture_task_runner_|
  89   // after the model is destroyed.
  90   scoped_ptr<Worker> worker_;
  91
  92   // Current list of sources.
  93   std::vector<Source> sources_;
  94
  95   base::WeakPtrFactory<NativeDesktopMediaList> weak_factory_;
  96
  97   DISALLOW_COPY_AND_ASSIGN(NativeDesktopMediaList);
  98 };
  99
 100 #endif  // CHROME_BROWSER_MEDIA_NATIVE_DESKTOP_MEDIA_LIST_H_