1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
|
// Copyright 2025 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_PERMISSIONS_PREDICTION_SERVICE_LANGUAGE_DETECTION_OBSERVER_H_
#define CHROME_BROWSER_PERMISSIONS_PREDICTION_SERVICE_LANGUAGE_DETECTION_OBSERVER_H_
#include "base/memory/weak_ptr.h"
#include "base/timer/timer.h"
#include "components/translate/core/browser/translate_driver.h"
#include "content/public/browser/web_contents.h"
class ChromeTranslateClient;
namespace permissions {
// An observer with timeout that waits for the page's language to be determined.
//
// This class checks if the language of the provided webcontents page is
// already known to be English. If so, it synchronously invokes the success
// callback. If the language is known and is not English, it invokes the
// fallback callback.
//
// If the language is not yet determined, it registers itself as a
// LanguageDetectionObserver using ChromeTranslateDriver class and will
// unregister itself as an observer after either a successful detection, a
// non-English detection, or a timeout. It then waits for language
// determination, invoking the appropriate callback based on whether the
// detected language is English.
//
// A timeout is used to limit the wait time for language detection. If
// the language is not determined within the timeout period, the fallback
// callback is invoked and the observer is deregistered.
class LanguageDetectionObserver
: public translate::TranslateDriver::LanguageDetectionObserver {
public:
LanguageDetectionObserver();
~LanguageDetectionObserver() override;
// The timeout for the language detection in seconds. If the language
// detection takes longer than this, the fallback callback will be invoked.
static const int kLanguageDetectionTimeout = 1;
// Virtual for testing.
virtual void Init(content::WebContents* web_contents,
base::OnceCallback<void()> on_english_detected,
base::OnceCallback<void()> on_fallback);
void OnLanguageDetermined(
const translate::LanguageDetectionDetails& details) override;
void Reset();
bool WaitingForLanguageDetection();
protected:
void OnTimeout();
// Virtual for testing.
virtual void RemoveAsObserver();
ChromeTranslateClient* chrome_translate_client();
raw_ptr<content::WebContents> web_contents_;
// Called when English is determined to be the language of the current
// webcontents.
base::OnceCallback<void()> on_english_detected_callback_;
// Called when language detection takes longer than the timeout or when the
// detected language is not English.
base::OnceCallback<void()> fallback_callback_;
base::OneShotTimer timeout_timer_;
// Used for the timer to bind OnTimeout as a callback.
base::WeakPtrFactory<LanguageDetectionObserver> weak_ptr_factory_{this};
};
} // namespace permissions
#endif // CHROME_BROWSER_PERMISSIONS_PREDICTION_SERVICE_LANGUAGE_DETECTION_OBSERVER_H_
|
