src/chrome/browser/speech/tts_message_filter.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_BROWSER_SPEECH_TTS_MESSAGE_FILTER_H_
   6 #define CHROME_BROWSER_SPEECH_TTS_MESSAGE_FILTER_H_
   7
   8 #include "base/memory/weak_ptr.h"
   9 #include "base/synchronization/lock.h"
  10 #include "chrome/browser/speech/tts_controller.h"
  11 #include "chrome/common/tts_messages.h"
  12 #include "content/public/browser/browser_message_filter.h"
  13
  14 namespace content {
  15 class BrowserContext;
  16 }
  17
  18 class TtsMessageFilter
  19     : public content::BrowserMessageFilter,
  20       public UtteranceEventDelegate,
  21       public VoicesChangedDelegate {
  22  public:
  23   explicit TtsMessageFilter(int render_process_id,
  24       content::BrowserContext* browser_context);
  25
  26   // content::BrowserMessageFilter implementation.
  27   void OverrideThreadForMessage(const IPC::Message& message,
  28                                 content::BrowserThread::ID* thread) override;
  29   bool OnMessageReceived(const IPC::Message& message) override;
  30   void OnChannelClosing() override;
  31   void OnDestruct() const override;
  32
  33   // UtteranceEventDelegate implementation.
  34   void OnTtsEvent(Utterance* utterance,
  35                   TtsEventType event_type,
  36                   int char_index,
  37                   const std::string& error_message) override;
  38
  39   // VoicesChangedDelegate implementation.
  40   void OnVoicesChanged() override;
  41
  42  private:
  43   friend class content::BrowserThread;
  44   friend class base::DeleteHelper<TtsMessageFilter>;
  45
  46   ~TtsMessageFilter() override;
  47
  48   void OnInitializeVoiceList();
  49   void OnSpeak(const TtsUtteranceRequest& utterance);
  50   void OnPause();
  51   void OnResume();
  52   void OnCancel();
  53
  54   void OnChannelClosingInUIThread();
  55
  56   void Cleanup();
  57
  58   // Thread-safe check to make sure this class is still valid and not
  59   // about to be deleted.
  60   bool Valid();
  61
  62   int render_process_id_;
  63   content::BrowserContext* browser_context_;
  64   mutable base::Lock mutex_;
  65   mutable bool valid_;
  66
  67   DISALLOW_COPY_AND_ASSIGN(TtsMessageFilter);
  68 };
  69
  70 #endif  // CHROME_BROWSER_SPEECH_TTS_MESSAGE_FILTER_H_