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/public/renderer/render_frame_observer.h"
  10 #include "third_party/WebKit/public/web/WebMIDIClient.h"
  11
  12 namespace blink {
  13 class WebMIDIPermissionRequest;
  14 }
  15
  16 namespace content {
  17
  18 // MidiDispatcher implements WebMIDIClient to handle permissions for using
  19 // system exclusive messages.
  20 // It works as RenderFrameObserver to handle IPC messages between
  21 // MidiDispatcherHost owned by WebContents since permissions are managed in
  22 // the browser process.
  23 class MidiDispatcher : public RenderFrameObserver,
  24                        public blink::WebMIDIClient {
  25  public:
  26   explicit MidiDispatcher(RenderFrame* render_frame);
  27   virtual ~MidiDispatcher();
  28
  29  private:
  30   // RenderFrameObserver implementation.
  31   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
  32
  33   // blink::WebMIDIClient implementation.
  34   virtual void requestSysexPermission(
  35       const blink::WebMIDIPermissionRequest& request);
  36   virtual void cancelSysexPermissionRequest(
  37       const blink::WebMIDIPermissionRequest& request);
  38
  39   // Permission for using system exclusive messages has been set.
  40   void OnSysExPermissionApproved(int client_id, bool is_allowed);
  41
  42   // Each WebMIDIPermissionRequest object is valid until
  43   // cancelSysexPermissionRequest() is called with the object, or used to call
  44   // WebMIDIPermissionRequest::setIsAllowed().
  45   typedef IDMap<blink::WebMIDIPermissionRequest, IDMapOwnPointer> Requests;
  46   Requests requests_;
  47
  48   DISALLOW_COPY_AND_ASSIGN(MidiDispatcher);
  49 };
  50
  51 }  // namespace content
  52
  53 #endif  // CONTENT_RENDERER_MEDIA_MIDI_DISPATCHER_H_