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// Copyright 2014 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 COMPONENTS_TRANSLATE_IOS_BROWSER_LANGUAGE_DETECTION_CONTROLLER_H_
#define COMPONENTS_TRANSLATE_IOS_BROWSER_LANGUAGE_DETECTION_CONTROLLER_H_
#include <string>
#include "base/callback_list.h"
#include "base/gtest_prod_util.h"
#include "base/mac/scoped_nsobject.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/prefs/pref_member.h"
#include "base/strings/string16.h"
#include "ios/web/public/web_state/web_state_observer.h"
class GURL;
@class JsLanguageDetectionManager;
class PrefService;
namespace base {
class DictionaryValue;
}
namespace web {
class WebState;
}
namespace translate {
class LanguageDetectionController : public web::WebStateObserver {
public:
// Language detection details, passed to language detection callbacks.
struct DetectionDetails {
// The language detected by the content (Content-Language).
std::string content_language;
// The language written in the lang attribute of the html element.
std::string html_root_language;
// The adopted language.
std::string adopted_language;
};
LanguageDetectionController(web::WebState* web_state,
JsLanguageDetectionManager* manager,
PrefService* prefs);
~LanguageDetectionController() override;
// Callback types for language detection events.
typedef base::Callback<void(const DetectionDetails&)> Callback;
typedef base::CallbackList<void(const DetectionDetails&)> CallbackList;
// Registers a callback for language detection events.
scoped_ptr<CallbackList::Subscription> RegisterLanguageDetectionCallback(
const Callback& callback);
private:
FRIEND_TEST_ALL_PREFIXES(LanguageDetectionControllerTest, OnTextCaptured);
// Starts the page language detection and initiates the translation process.
void StartLanguageDetection();
// Handles the "languageDetection.textCaptured" javascript command.
// |interacting| is true if the user is currently interacting with the page.
bool OnTextCaptured(const base::DictionaryValue& value,
const GURL& url,
bool interacting);
// Completion handler used to retrieve the text buffered by the
// JsLanguageDetectionManager.
void OnTextRetrieved(const std::string& http_content_language,
const std::string& html_lang,
const base::string16& text);
// web::WebStateObserver implementation:
void PageLoaded(
web::PageLoadCompletionStatus load_completion_status) override;
void UrlHashChanged() override;
void HistoryStateChanged() override;
void WebStateDestroyed() override;
CallbackList language_detection_callbacks_;
base::scoped_nsobject<JsLanguageDetectionManager> js_manager_;
BooleanPrefMember translate_enabled_;
base::WeakPtrFactory<LanguageDetectionController> weak_method_factory_;
DISALLOW_COPY_AND_ASSIGN(LanguageDetectionController);
};
} // namespace translate
#endif // COMPONENTS_TRANSLATE_IOS_BROWSER_LANGUAGE_DETECTION_CONTROLLER_H_
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