content/renderer/media/midi_dispatcher.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 CONTENT_RENDERER_MEDIA_MIDI_DISPATCHER_H_
   6 #define CONTENT_RENDERER_MEDIA_MIDI_DISPATCHER_H_
   7
   8 #include "base/id_map.h"
   9 #include "content/common/permission_service.mojom.h"
  10 #include "content/public/renderer/render_frame_observer.h"
  11 #include "third_party/WebKit/public/web/WebMIDIClient.h"
  12
  13 namespace blink {
  14 class WebMIDIPermissionRequest;
  15 }
  16
  17 namespace content {
  18
  19 // MidiDispatcher implements WebMIDIClient to handle permissions for using
  20 // system exclusive messages.
  21 // It works as RenderFrameObserver to keep a 1:1 relationship with a RenderFrame
  22 // and make sure it has the same life cycle.
  23 class MidiDispatcher : public RenderFrameObserver,
  24                        public blink::WebMIDIClient {
  25  public:
  26   explicit MidiDispatcher(RenderFrame* render_frame);
  27   virtual ~MidiDispatcher();
  28
  29  private:
  30   // blink::WebMIDIClient implementation.
  31   virtual void requestSysexPermission(
  32       const blink::WebMIDIPermissionRequest& request);
  33   virtual void cancelSysexPermissionRequest(
  34       const blink::WebMIDIPermissionRequest& request);
  35
  36   // Permission for using system exclusive messages has been set.
  37   void OnSysExPermissionSet(int request_id, PermissionStatus status);
  38
  39   // Each WebMIDIPermissionRequest object is valid until
  40   // cancelSysexPermissionRequest() is called with the object, or used to call
  41   // WebMIDIPermissionRequest::setIsAllowed().
  42   typedef IDMap<blink::WebMIDIPermissionRequest, IDMapOwnPointer> Requests;
  43   Requests requests_;
  44
  45   PermissionServicePtr permission_service_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(MidiDispatcher);
  48 };
  49
  50 }  // namespace content
  51
  52 #endif  // CONTENT_RENDERER_MEDIA_MIDI_DISPATCHER_H_