chrome/browser/media/router/media_router_dialog_controller.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_MEDIA_ROUTER_DIALOG_CONTROLLER_H_
   6 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_DIALOG_CONTROLLER_H_
   7
   8 #include <string>
   9
  10 #include "base/macros.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/threading/thread_checker.h"
  13 #include "chrome/browser/media/router/create_presentation_session_request.h"
  14 #include "content/public/browser/web_contents_observer.h"
  15
  16 namespace content {
  17 class WebContents;
  18 }  // namespace content
  19
  20 namespace media_router {
  21
  22 // An abstract base class for Media Router dialog controllers. Tied to a
  23 // WebContents known as the |initiator|, and is lazily created when a Media
  24 // Router dialog needs to be shown. The MediaRouterDialogController allows
  25 // showing and closing a Media Router dialog modal to the initiator WebContents.
  26 // This class is not thread safe and must be called on the UI thread.
  27 class MediaRouterDialogController {
  28  public:
  29   virtual ~MediaRouterDialogController();
  30
  31   // Gets a reference to the MediaRouterDialogController associated with
  32   // |web_contents|, creating one if it does not exist. The returned pointer is
  33   // guaranteed to be non-null.
  34   static MediaRouterDialogController* GetOrCreateForWebContents(
  35       content::WebContents* web_contents);
  36
  37   // Shows the media router dialog modal to |initiator_| and the parameters
  38   // specified in |request|.
  39   // Creates the dialog if it did not exist prior to this call, returns true.
  40   // If the dialog already exists, brings it to the front but doesn't change the
  41   // dialog with |request|, returns false and |request| is deleted.
  42   bool ShowMediaRouterDialogForPresentation(
  43       scoped_ptr<CreatePresentationSessionRequest> request);
  44
  45   // Shows the media router dialog modal to |initiator_|.
  46   // Creates the dialog if it did not exist prior to this call, returns true.
  47   // If the dialog already exists, brings it to the front, returns false.
  48   virtual bool ShowMediaRouterDialog();
  49
  50   // Hides the media router dialog.
  51   // It is a no-op to call this function if there is currently no dialog.
  52   void HideMediaRouterDialog();
  53
  54  protected:
  55   // Use MediaRouterDialogController::GetOrCreateForWebContents() to create an
  56   // instance.
  57   explicit MediaRouterDialogController(content::WebContents* initiator);
  58
  59   // Activates the WebContents that initiated the dialog, e.g. focuses the tab.
  60   void ActivateInitiatorWebContents();
  61
  62   // Passes the ownership of the CreatePresentationSessionRequest to the caller.
  63   scoped_ptr<CreatePresentationSessionRequest> TakePresentationRequest();
  64
  65   // Returns the CreatePresentationSessionRequest to the caller but keeps the
  66   // ownership with the MediaRouterDialogController.
  67   const CreatePresentationSessionRequest* presentation_request() const {
  68     return presentation_request_.get();
  69   }
  70
  71   // Returns the WebContents that initiated showing the dialog.
  72   content::WebContents* initiator() const { return initiator_; }
  73
  74   // Resets the state of the controller. Must be called from the overrides.
  75   virtual void Reset();
  76   // Creates a new media router dialog modal to |initiator_|.
  77   virtual void CreateMediaRouterDialog() = 0;
  78   // Closes the media router dialog if it exists.
  79   virtual void CloseMediaRouterDialog() = 0;
  80   // Indicates if the media router dialog already exists.
  81   virtual bool IsShowingMediaRouterDialog() const = 0;
  82
  83   base::ThreadChecker thread_checker_;
  84
  85  private:
  86   class InitiatorWebContentsObserver;
  87
  88   // An observer for the |initiator_| that closes the dialog when |initiator_|
  89   // is destroyed or navigated.
  90   scoped_ptr<InitiatorWebContentsObserver> initiator_observer_;
  91   content::WebContents* const initiator_;
  92
  93   // Data for dialogs created at the request of the Presentation API.
  94   // Passed from the caller via ShowMediaRouterDialogForPresentation to the
  95   // dialog when it is initialized.
  96   scoped_ptr<CreatePresentationSessionRequest> presentation_request_;
  97
  98   DISALLOW_COPY_AND_ASSIGN(MediaRouterDialogController);
  99 };
 100
 101 }  // namespace media_router
 102
 103 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_ROUTER_DIALOG_CONTROLLER_H_