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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_CORE_BROWSER_LANGUAGE_STATE_H_
#define COMPONENTS_TRANSLATE_CORE_BROWSER_LANGUAGE_STATE_H_
#include <string>
#include "base/basictypes.h"
namespace translate {
class TranslateDriver;
// This class holds the language state of the current page.
// There is one LanguageState instance per tab.
// It is used to determine when navigating to a new page whether it should
// automatically be translated.
// This auto-translate behavior is the expected behavior when:
// - user is on page in language A that they had translated to language B.
// - user clicks a link in that page that takes them to a page also in language
// A.
class LanguageState {
public:
explicit LanguageState(TranslateDriver* driver);
~LanguageState();
// Should be called when the page did a new navigation (whether it is a main
// frame or sub-frame navigation).
void DidNavigate(bool in_page_navigation, bool is_main_frame, bool reload);
// Should be called when the language of the page has been determined.
// |page_needs_translation| when false indicates that the browser should not
// offer to translate the page.
void LanguageDetermined(const std::string& page_language,
bool page_needs_translation);
// Returns the language the current page should be translated to, based on the
// previous page languages and the transition. This should be called after
// the language page has been determined.
// Returns an empty string if the page should not be auto-translated.
std::string AutoTranslateTo() const;
// Returns true if the user is navigating through translated links.
bool InTranslateNavigation() const;
// Returns true if the current page in the associated tab has been translated.
bool IsPageTranslated() const { return original_lang_ != current_lang_; }
const std::string& original_language() const { return original_lang_; }
void SetCurrentLanguage(const std::string& language);
const std::string& current_language() const { return current_lang_; }
bool page_needs_translation() const { return page_needs_translation_; }
// Whether the page is currently in the process of being translated.
bool translation_pending() const { return translation_pending_; }
void set_translation_pending(bool value) { translation_pending_ = value; }
// Whether the user has already declined to translate the page.
bool translation_declined() const { return translation_declined_; }
void set_translation_declined(bool value) { translation_declined_ = value; }
// Whether the current page was navigated through an in-page (fragment)
// navigation.
bool in_page_navigation() const { return in_page_navigation_; }
// Whether the translate is enabled.
bool translate_enabled() const { return translate_enabled_; }
void SetTranslateEnabled(bool value);
// Whether the current page's language is different from the previous
// language.
bool HasLanguageChanged() const;
private:
void SetIsPageTranslated(bool value);
// Whether the page is translated or not.
bool is_page_translated_;
// The languages this page is in. Note that current_lang_ is different from
// original_lang_ when the page has been translated.
// Note that these might be empty if the page language has not been determined
// yet.
std::string original_lang_;
std::string current_lang_;
// Same as above but for the previous page.
std::string prev_original_lang_;
std::string prev_current_lang_;
// Provides driver-level context to the shared code of the component. Must
// outlive this object.
TranslateDriver* translate_driver_;
// Whether it is OK to offer to translate the page. Some pages explictly
// specify that they should not be translated by the browser (this is the case
// for GMail for example, which provides its own translation features).
bool page_needs_translation_;
// Whether a translation is currently pending.
// This is needed to avoid sending duplicate translate requests to a page.
// Translations may be initiated every time the load stops for the main frame,
// which may happen several times.
// TODO(jcampan): make the client send the language just once per navigation
// then we can get rid of that state.
bool translation_pending_;
// Whether the user has declined to translate the page (by closing the infobar
// for example). This is necessary as a new infobar could be shown if a new
// load happens in the page after the user closed the infobar.
bool translation_declined_;
// Whether the current navigation is a fragment navigation (in page).
bool in_page_navigation_;
// Whether the Translate is enabled.
bool translate_enabled_;
DISALLOW_COPY_AND_ASSIGN(LanguageState);
};
} // namespace translate
#endif // COMPONENTS_TRANSLATE_CORE_BROWSER_LANGUAGE_STATE_H_
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