electron/chromium_src/chrome/renderer/tts_dispatcher.h
2014-10-07 21:18:44 +08:00

78 lines
No EOL
2.9 KiB
C++

// Copyright (c) 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_RENDERER_TTS_DISPATCHER_H_
#define CHROME_RENDERER_TTS_DISPATCHER_H_
#include <vector>
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/containers/hash_tables.h"
#include "content/public/renderer/render_process_observer.h"
#include "third_party/WebKit/public/platform/WebSpeechSynthesizer.h"
#include "third_party/WebKit/public/platform/WebSpeechSynthesizerClient.h"
namespace IPC {
class Message;
}
struct TtsVoice;
// TtsDispatcher is a delegate for methods used by Blink for speech synthesis
// APIs. It's the complement of TtsDispatcherHost (owned by RenderViewHost).
// Each TtsDispatcher is owned by the WebSpeechSynthesizerClient in Blink;
// it registers itself to listen to IPC upon construction and unregisters
// itself when deleted. There can be multiple TtsDispatchers alive at once,
// so each one routes IPC messages to its WebSpeechSynthesizerClient only if
// the utterance id (which is globally unique) matches.
class TtsDispatcher
: public blink::WebSpeechSynthesizer,
public content::RenderProcessObserver {
public:
explicit TtsDispatcher(blink::WebSpeechSynthesizerClient* client);
private:
virtual ~TtsDispatcher();
// RenderProcessObserver override.
virtual bool OnControlMessageReceived(const IPC::Message& message) OVERRIDE;
// blink::WebSpeechSynthesizer implementation.
virtual void updateVoiceList() OVERRIDE;
virtual void speak(const blink::WebSpeechSynthesisUtterance& utterance)
OVERRIDE;
virtual void pause() OVERRIDE;
virtual void resume() OVERRIDE;
virtual void cancel() OVERRIDE;
blink::WebSpeechSynthesisUtterance FindUtterance(int utterance_id);
void OnSetVoiceList(const std::vector<TtsVoice>& voices);
void OnDidStartSpeaking(int utterance_id);
void OnDidFinishSpeaking(int utterance_id);
void OnDidPauseSpeaking(int utterance_id);
void OnDidResumeSpeaking(int utterance_id);
void OnWordBoundary(int utterance_id, int char_index);
void OnSentenceBoundary(int utterance_id, int char_index);
void OnMarkerEvent(int utterance_id, int char_index);
void OnWasInterrupted(int utterance_id);
void OnWasCancelled(int utterance_id);
void OnSpeakingErrorOccurred(int utterance_id,
const std::string& error_message);
// The WebKit client class that we use to send events back to the JS world.
// Weak reference, this will be valid as long as this object exists.
blink::WebSpeechSynthesizerClient* synthesizer_client_;
// Next utterance id, used to map response IPCs to utterance objects.
static int next_utterance_id_;
// Map from id to utterance objects.
base::hash_map<int, blink::WebSpeechSynthesisUtterance> utterance_id_map_;
DISALLOW_COPY_AND_ASSIGN(TtsDispatcher);
};
#endif // CHROME_RENDERER_TTS_DISPATCHER_H_