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_view_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 class RenderViewImpl;
  19
  20 // MIDIDispatcher implements WebMIDIClient to handle permissions for using
  21 // system exclusive messages.
  22 // It works as RenderViewObserver to handle IPC messages between
  23 // MIDIDispatcherHost owned by RenderViewHost since permissions are managed in
  24 // the browser process.
  25 class MIDIDispatcher : public RenderViewObserver,
  26                        public blink::WebMIDIClient {
  27  public:
  28   explicit MIDIDispatcher(RenderViewImpl* render_view);
  29   virtual ~MIDIDispatcher();
  30
  31  private:
  32   // RenderView::Observer implementation.
  33   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
  34
  35   // blink::WebMIDIClient implementation.
  36   virtual void requestSysExPermission(
  37       const blink::WebMIDIPermissionRequest& request) OVERRIDE;
  38   virtual void cancelSysExPermissionRequest(
  39       const blink::WebMIDIPermissionRequest& request) OVERRIDE;
  40
  41   // Permission for using system exclusive messages has been set.
  42   void OnSysExPermissionApproved(int client_id, bool is_allowed);
  43
  44   // Each WebMIDIPermissionRequest object is valid until
  45   // cancelSysExPermissionRequest() is called with the object, or used to call
  46   // WebMIDIPermissionRequest::setIsAllowed().
  47   IDMap<blink::WebMIDIPermissionRequest> requests_;
  48
  49   DISALLOW_COPY_AND_ASSIGN(MIDIDispatcher);
  50 };
  51
  52 }  // namespace content
  53
  54 #endif  // CONTENT_RENDERER_MEDIA_MIDI_DISPATCHER_H_