Move LanguageState to the translate component

chrome/browser/tab_contents/language_state.h

-// Copyright (c) 2011 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_
-
-#include <string>
-
-#include "base/basictypes.h"
-
-class LanguageStateObserver;
-
-namespace content {
-struct LoadCommittedDetails;
-class NavigationController;
-class WebContents;
-}
-
-// This class holds the language state of the current page.
-// There is one LanguageState instance per WebContents.
-// 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(content::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(const content::LoadCommittedDetails& details);
-
-  // 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. This value is supposed to be used for the
-  // Translate icon on the Omnibox.
-  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;
-
-  void set_observer(LanguageStateObserver* observer) { observer_ = observer; }
-
- 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_;
-
-  // The navigation controller of the tab we are associated with.
-  content::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_needs_translation_;
-
-  // Whether a translation is currently pending (WebContents 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_;
-
-  // Whether the Translate is enabled.
-  bool translate_enabled_;
-
-  LanguageStateObserver* observer_;
-
-  DISALLOW_COPY_AND_ASSIGN(LanguageState);
-};
-
-#endif  // CHROME_BROWSER_TAB_CONTENTS_LANGUAGE_STATE_H_