1/*
2 * Copyright (C) 2010 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#ifndef SpeechInput_h
32#define SpeechInput_h
33
34#if ENABLE(INPUT_SPEECH)
35
36#include "SpeechInputListener.h"
37#include <wtf/Forward.h>
38#include <wtf/HashMap.h>
39
40namespace WebCore {
41
42class IntRect;
43class SecurityOrigin;
44class SpeechInputClient;
45class SpeechInputListener;
46
47// This class connects the input elements requiring speech input with the platform specific
48// speech recognition engine. It provides methods for the input elements to activate speech
49// recognition and methods for the speech recognition engine to return back the results.
50class SpeechInput : public SpeechInputListener {
51    WTF_MAKE_NONCOPYABLE(SpeechInput);
52public:
53    SpeechInput(SpeechInputClient*);
54    virtual ~SpeechInput();
55
56    // Generates a unique ID for the given listener to be used for speech requests.
57    // This should be the first call made by listeners before anything else.
58    int registerListener(SpeechInputListener*);
59
60    // Invoked when the listener is done with recording or getting destroyed.
61    // Failure to unregister may result in crashes if there were any pending speech events.
62    void unregisterListener(int);
63
64    // Methods invoked by the input elements.
65    bool startRecognition(int listenerId, const IntRect& elementRect, const AtomicString& language, const String& grammar, SecurityOrigin*);
66    void stopRecording(int);
67    void cancelRecognition(int);
68
69    // SpeechInputListener methods.
70    virtual void didCompleteRecording(int);
71    virtual void didCompleteRecognition(int);
72    virtual void setRecognitionResult(int, const SpeechInputResultArray&);
73
74private:
75    SpeechInputClient* m_client;
76    HashMap<int, SpeechInputListener*> m_listeners;
77    int m_nextListenerId;
78};
79
80} // namespace WebCore
81
82#endif // ENABLE(INPUT_SPEECH)
83
84#endif // SpeechInput_h
85