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// Copyright (c) 2010 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_BROWSER_SPEECH_SPEECH_INPUT_MANAGER_H_
#define CHROME_BROWSER_SPEECH_SPEECH_INPUT_MANAGER_H_
#include "base/basictypes.h"
#include "chrome/common/speech_input_result.h"
#include "gfx/rect.h"
#include "ipc/ipc_message.h"
namespace speech_input {
// This is the gatekeeper for speech recognition in the browser process. It
// handles requests received from various render views and makes sure only one
// of them can use speech recognition at a time. It also sends recognition
// results and status events to the render views when required.
// This class is a singleton and accessed via the Get method.
class SpeechInputManager {
public:
// Implemented by the dispatcher host to relay events to the render views.
class Delegate {
public:
virtual void SetRecognitionResult(
int caller_id,
const SpeechInputResultArray& result) = 0;
virtual void DidCompleteRecording(int caller_id) = 0;
virtual void DidCompleteRecognition(int caller_id) = 0;
protected:
virtual ~Delegate() {}
};
// Whether the speech input feature is enabled, based on the browser channel
// information and command line flags.
static bool IsFeatureEnabled();
// Factory method to access the singleton. We have this method here instead of
// using Singleton<> directly in the calling code to aid tests in injection
// mocks.
static SpeechInputManager* Get();
// Factory method definition useful for tests.
typedef SpeechInputManager* (AccessorMethod)();
virtual ~SpeechInputManager() {}
// Handlers for requests from render views.
// |delegate| is a weak pointer and should remain valid until
// its |DidCompleteRecognition| method is called or recognition is cancelled.
// |render_process_id| is the ID of the renderer process initiating the
// request.
// |element_rect| is the display bounds of the html element requesting speech
// input (in page coordinates).
virtual void StartRecognition(Delegate* delegate,
int caller_id,
int render_process_id,
int render_view_id,
const gfx::Rect& element_rect,
const std::string& language,
const std::string& grammar) = 0;
virtual void CancelRecognition(int caller_id) = 0;
virtual void StopRecording(int caller_id) = 0;
};
// This typedef is to workaround the issue with certain versions of
// Visual Studio where it gets confused between multiple Delegate
// classes and gives a C2500 error. (I saw this error on the try bots -
// the workaround was not needed for my machine).
typedef SpeechInputManager::Delegate SpeechInputManagerDelegate;
} // namespace speech_input
#endif // CHROME_BROWSER_SPEECH_SPEECH_INPUT_MANAGER_H_
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