Move LanguageState to the translate component

chrome/browser/tab_contents/language_state.cc

-// 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.
-
-#include "chrome/browser/tab_contents/language_state.h"
-
-#include "chrome/browser/tab_contents/language_state_observer.h"
-#include "content/public/browser/navigation_controller.h"
-#include "content/public/browser/navigation_details.h"
-#include "content/public/browser/navigation_entry.h"
-#include "content/public/browser/web_contents.h"
-
-using content::NavigationController;
-
-LanguageState::LanguageState(NavigationController* nav_controller)
-    : is_page_translated_(false),
-      navigation_controller_(nav_controller),
-      page_needs_translation_(false),
-      translation_pending_(false),
-      translation_declined_(false),
-      in_page_navigation_(false),
-      translate_enabled_(false),
-      observer_(NULL) {
-}
-
-LanguageState::~LanguageState() {
-}
-
-void LanguageState::DidNavigate(
-    const content::LoadCommittedDetails& details) {
-  in_page_navigation_ = details.is_in_page;
-  if (in_page_navigation_ || !details.is_main_frame)
-    return;  // Don't reset our states, the page has not changed.
-
-  bool reload =
-      details.entry->GetTransitionType() == content::PAGE_TRANSITION_RELOAD ||
-      details.type == content::NAVIGATION_TYPE_SAME_PAGE;
-  if (reload) {
-    // We might not get a LanguageDetermined notifications on reloads. Make sure
-    // to keep the original language and to set current_lang_ so
-    // IsPageTranslated() returns false.
-    current_lang_ = original_lang_;
-  } else {
-    prev_original_lang_ = original_lang_;
-    prev_current_lang_ = current_lang_;
-    original_lang_.clear();
-    current_lang_.clear();
-  }
-
-  SetIsPageTranslated(false);
-
-  translation_pending_ = false;
-  translation_declined_ = false;
-
-  SetTranslateEnabled(false);
-}
-
-void LanguageState::LanguageDetermined(const std::string& page_language,
-                                       bool page_needs_translation) {
-  if (in_page_navigation_ && !original_lang_.empty()) {
-    // In-page navigation, we don't expect our states to change.
-    // Note that we'll set the languages if original_lang_ is empty.  This might
-    // happen if the we did not get called on the top-page.
-    return;
-  }
-  page_needs_translation_ = page_needs_translation;
-  original_lang_ = page_language;
-  current_lang_ = page_language;
-  SetIsPageTranslated(false);
-}
-
-bool LanguageState::InTranslateNavigation() const {
-  // The user is in the same translate session if
-  //   - no translation is pending
-  //   - this page is in the same language as the previous page
-  //   - the previous page had been translated
-  //   - the new page was navigated through a link.
-  return
-      !translation_pending_ &&
-      prev_original_lang_ == original_lang_ &&
-      prev_original_lang_ != prev_current_lang_ &&
-      navigation_controller_ &&
-      navigation_controller_->GetActiveEntry() &&
-      navigation_controller_->GetActiveEntry()->GetTransitionType() ==
-          content::PAGE_TRANSITION_LINK;
-}
-
-void LanguageState::SetCurrentLanguage(const std::string& language) {
-  current_lang_ = language;
-  SetIsPageTranslated(current_lang_ != original_lang_);
-}
-
-std::string LanguageState::AutoTranslateTo() const {
-  if (InTranslateNavigation() && !is_page_translated_)
-    return prev_current_lang_;
-
-  return std::string();
-}
-
-void LanguageState::SetTranslateEnabled(bool value) {
-  if (translate_enabled_ == value)
-    return;
-
-  translate_enabled_ = value;
-  if (observer_) {
-    content::WebContents* web_contents =
-        navigation_controller_->GetWebContents();
-    observer_->OnTranslateEnabledChanged(web_contents);
-  }
-}
-
-bool LanguageState::HasLanguageChanged() const {
-  return original_lang_ != prev_original_lang_;
-}
-
-void LanguageState::SetIsPageTranslated(bool value) {
-  if (is_page_translated_ == value)
-    return;
-
-  is_page_translated_ = value;
-  if (observer_) {
-    content::WebContents* web_contents =
-        navigation_controller_->GetWebContents();
-    observer_->OnIsPageTranslatedChanged(web_contents);
-  }
-
-  // With the translation done, the translate feature must be enabled.
-  if (is_page_translated_)
-    SetTranslateEnabled(true);
-}