chrome/renderer/tts_dispatcher.h

   1 // Copyright (c) 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_RENDERER_TTS_DISPATCHER_H_
   6 #define CHROME_RENDERER_TTS_DISPATCHER_H_
   7
   8 #include <vector>
   9
  10 #include "base/basictypes.h"
  11 #include "base/compiler_specific.h"
  12 #include "base/hash_tables.h"
  13 #include "content/public/renderer/render_process_observer.h"
  14 #include "third_party/WebKit/Source/Platform/chromium/public/WebSpeechSynthesizer.h"
  15 #include "third_party/WebKit/Source/Platform/chromium/public/WebSpeechSynthesizerClient.h"
  16
  17 namespace IPC {
  18 class Message;
  19 }
  20
  21 struct TtsVoice;
  22
  23 // TtsDispatcher is a delegate for methods used by WebKit for
  24 // speech synthesis APIs. It's the complement of
  25 // TtsDispatcherHost (owned by RenderViewHost).
  26 class TtsDispatcher
  27     : public WebKit::WebSpeechSynthesizer,
  28       public content::RenderProcessObserver {
  29  public:
  30   explicit TtsDispatcher(WebKit::WebSpeechSynthesizerClient* client);
  31
  32  private:
  33   virtual ~TtsDispatcher();
  34
  35   // RenderProcessObserver override.
  36   virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
  37
  38   // WebKit::WebSpeechSynthesizer implementation.
  39   virtual void updateVoiceList() OVERRIDE;
  40   virtual void speak(const WebKit::WebSpeechSynthesisUtterance& utterance)
  41       OVERRIDE;
  42   virtual void pause() OVERRIDE;
  43   virtual void resume() OVERRIDE;
  44   virtual void cancel() OVERRIDE;
  45
  46   WebKit::WebSpeechSynthesisUtterance FindUtterance(int utterance_id);
  47
  48   void OnSetVoiceList(const std::vector<TtsVoice>& voices);
  49   void OnDidStartSpeaking(int utterance_id);
  50   void OnDidFinishSpeaking(int utterance_id);
  51   void OnDidPauseSpeaking(int utterance_id);
  52   void OnDidResumeSpeaking(int utterance_id);
  53   void OnWordBoundary(int utterance_id, int char_index);
  54   void OnSentenceBoundary(int utterance_id, int char_index);
  55   void OnMarkerEvent(int utterance_id, int char_index);
  56   void OnWasInterrupted(int utterance_id);
  57   void OnWasCancelled(int utterance_id);
  58   void OnSpeakingErrorOccurred(int utterance_id,
  59                                const std::string& error_message);
  60
  61   // The WebKit client class that we use to send events back to the JS world.
  62   // Weak reference, this will be valid as long as this object exists.
  63   WebKit::WebSpeechSynthesizerClient* synthesizer_client_;
  64
  65   // Next utterance id, used to map response IPCs to utterance objects.
  66   static int next_utterance_id_;
  67
  68   // Map from id to utterance objects.
  69   base::hash_map<int, WebKit::WebSpeechSynthesisUtterance> utterance_id_map_;
  70
  71   DISALLOW_COPY_AND_ASSIGN(TtsDispatcher);
  72 };
  73
  74 #endif  // CHROME_RENDERER_TTS_DISPATCHER_H_