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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_TAB_CONTENTS_LANGUAGE_STATE_H_
#define CHROME_BROWSER_TAB_CONTENTS_LANGUAGE_STATE_H_
#pragma once
#include <string>
#include "base/basictypes.h"
class NavigationController;
// This class holds the language state of the current page.
// There is one LanguageState instance per TabContents.
// 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(NavigationController* nav_controller);
~LanguageState();
// Should be called when the page did a new navigation (whether it is a main
// frame or sub-frame navigation).
void DidNavigate(bool reload, bool in_page_navigation);
// Should be called when the language of the page has been determined.
// |page_translatable| when false indicates that the browser should not offer
// to translate the page.
void LanguageDetermined(const std::string& page_language,
bool page_translatable);
// 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 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 set_current_language(const std::string& language) {
current_lang_ = language;
}
const std::string& current_language() const { return current_lang_; }
bool page_translatable() const { return page_translatable_; }
// 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_; }
private:
// 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_;
// The navigation controller of the tab we are associated with.
NavigationController* navigation_controller_;
// 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_translatable_;
// Whether a translation is currently pending (TabContents waiting for the
// PAGE_TRANSLATED notification). This is needed to avoid sending duplicate
// translate requests to a page. TranslateManager initiates translations
// when it received the LANGUAGE_DETERMINED notification. This is sent by
// the renderer with the page contents, every time the load stops for the
// main frame, so we may get several.
// TODO(jcampan): make the renderer 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_;
DISALLOW_COPY_AND_ASSIGN(LanguageState);
};
#endif // CHROME_BROWSER_TAB_CONTENTS_LANGUAGE_STATE_H_
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