Translate: Refactoring: Create TranslateUIDelegate

chrome/browser/translate/translate_ui_delegate.cc

+// Copyright 2013 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/translate/translate_ui_delegate.h"
+
+#include "base/i18n/string_compare.h"
+#include "base/metrics/histogram.h"
+#include "chrome/browser/browser_process.h"
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/translate/translate_manager.h"
+#include "chrome/browser/translate/translate_prefs.h"
+#include "chrome/browser/translate/translate_tab_helper.h"
+#include "components/translate/common/translate_constants.h"
+#include "content/public/browser/browser_context.h"
+#include "content/public/browser/navigation_entry.h"
+#include "content/public/browser/web_contents.h"
+#include "third_party/icu/source/i18n/unicode/coll.h"
+#include "ui/base/l10n/l10n_util.h"
+
+namespace {
+
+const char kDeclineTranslate[] = "Translate.DeclineTranslate";
+const char kRevertTranslation[] = "Translate.RevertTranslation";
+const char kPerformTranslate[] = "Translate.Translate";
+const char kNeverTranslateLang[] = "Translate.NeverTranslateLang";
+const char kNeverTranslateSite[] = "Translate.NeverTranslateSite";
+const char kAlwaysTranslateLang[] = "Translate.AlwaysTranslateLang";
+
+}
+
+TranslateUIDelegate::TranslateUIDelegate(content::WebContents* web_contents,
+                                         const std::string& original_language,
+                                         const std::string& target_language)
+    : web_contents_(web_contents),
+      original_language_index_(NO_INDEX),
+      initial_original_language_index_(NO_INDEX),
+      target_language_index_(NO_INDEX) {
+  std::vector<std::string> language_codes;
+  TranslateManager::GetSupportedLanguages(&language_codes);
+
+  // Preparing for the alphabetical order in the locale.
+  UErrorCode error = U_ZERO_ERROR;
+  std::string locale = g_browser_process->GetApplicationLocale();
+  icu::Locale loc(locale.c_str());
+  scoped_ptr<icu::Collator> collator(icu::Collator::createInstance(loc, error));
+  collator->setStrength(icu::Collator::PRIMARY);
+
+  languages_.reserve(language_codes.size());
+  for (std::vector<std::string>::const_iterator iter = language_codes.begin();
+       iter != language_codes.end(); ++iter) {
+    std::string language_code = *iter;
+
+    string16 language_name = l10n_util::GetDisplayNameForLocale(
+        language_code, g_browser_process->GetApplicationLocale(), true);
+    // Insert the language in languages_ in alphabetical order.
+    std::vector<LanguageNamePair>::iterator iter2;
+    for (iter2 = languages_.begin(); iter2 != languages_.end(); ++iter2) {
+      if (base::i18n::CompareString16WithCollator(collator.get(),
+          language_name, iter2->second) == UCOL_LESS) {
+        break;
+      }
+    }
+    languages_.insert(iter2, LanguageNamePair(language_code, language_name));
+  }
+  for (std::vector<LanguageNamePair>::const_iterator iter = languages_.begin();
+       iter != languages_.end(); ++iter) {
+    std::string language_code = iter->first;
+    if (language_code == original_language) {
+      original_language_index_ = iter - languages_.begin();
+      initial_original_language_index_ = original_language_index_;
+    }
+    if (language_code == target_language)
+      target_language_index_ = iter - languages_.begin();
+  }
+
+  Profile* profile =
+      Profile::FromBrowserContext(web_contents->GetBrowserContext());
+  prefs_.reset(new TranslatePrefs(profile->GetPrefs()));
+}
+
+TranslateUIDelegate::~TranslateUIDelegate() {
+}
+
+size_t TranslateUIDelegate::GetNumberOfLanguages() const {
+  return languages_.size();
+}
+
+size_t TranslateUIDelegate::GetOriginalLanguageIndex() const {
+  return original_language_index_;
+}
+
+void TranslateUIDelegate::SetOriginalLanguageIndex(size_t language_index) {
+  DCHECK_LT(language_index, GetNumberOfLanguages());
+  original_language_index_ = language_index;
+}
+
+size_t TranslateUIDelegate::GetTargetLanguageIndex() const {
+  return target_language_index_;
+}
+
+void TranslateUIDelegate::SetTargetLanguageIndex(size_t language_index) {
+  DCHECK_LT(language_index, GetNumberOfLanguages());
+  target_language_index_ = language_index;
+}
+
+
+std::string TranslateUIDelegate::GetLanguageCodeAt(size_t index) const {
+  DCHECK_LT(index, GetNumberOfLanguages());
+  return languages_[index].first;
+}
+
+string16 TranslateUIDelegate::GetLanguageNameAt(size_t index) const {
+  if (index == static_cast<size_t>(NO_INDEX))
+    return string16();
+  DCHECK_LT(index, GetNumberOfLanguages());
+  return languages_[index].second;
+}
+
+std::string TranslateUIDelegate::GetOriginalLanguageCode() const {
+  return (GetOriginalLanguageIndex() == static_cast<size_t>(NO_INDEX)) ?
+      translate::kUnknownLanguageCode :
+      GetLanguageCodeAt(GetOriginalLanguageIndex());
+}
+
+std::string TranslateUIDelegate::GetTargetLanguageCode() const {
+  return GetLanguageCodeAt(GetTargetLanguageIndex());
+}
+
+void TranslateUIDelegate::Translate() {
+  if (!web_contents()->GetBrowserContext()->IsOffTheRecord()) {
+    prefs_->ResetTranslationDeniedCount(GetOriginalLanguageCode());
+    prefs_->IncrementTranslationAcceptedCount(GetOriginalLanguageCode());
+  }
+  TranslateManager::GetInstance()->TranslatePage(web_contents(),
+                                                 GetOriginalLanguageCode(),
+                                                 GetTargetLanguageCode());
+
+  UMA_HISTOGRAM_BOOLEAN(kPerformTranslate, true);
+}
+
+void TranslateUIDelegate::RevertTranslation() {
+  TranslateManager::GetInstance()->RevertTranslation(web_contents());
+
+  UMA_HISTOGRAM_BOOLEAN(kRevertTranslation, true);
+}
+
+void TranslateUIDelegate::TranslationDeclined() {
+  if (!web_contents()->GetBrowserContext()->IsOffTheRecord()) {
+    prefs_->ResetTranslationAcceptedCount(GetOriginalLanguageCode());
+    prefs_->IncrementTranslationDeniedCount(GetOriginalLanguageCode());
+  }
+
+  // Remember that the user declined the translation so as to prevent showing a
+  // translate infobar for that page again.  (TranslateManager initiates
+  // translations when getting a LANGUAGE_DETERMINED from the page, which
+  // happens when a load stops. That could happen multiple times, including
+  // after the user already declined the translation.)
+  TranslateTabHelper::FromWebContents(web_contents())->
+      language_state().set_translation_declined(true);
+
+  UMA_HISTOGRAM_BOOLEAN(kDeclineTranslate, true);
+}
+
+bool TranslateUIDelegate::IsLanguageBlocked() {
+  return prefs_->IsBlockedLanguage(GetOriginalLanguageCode());
+}
+
+void TranslateUIDelegate::SetLanguageBlocked(bool value) {
+  if (value)
+    prefs_->BlockLanguage(GetOriginalLanguageCode());
+  else
+    prefs_->UnblockLanguage(GetOriginalLanguageCode());
+
+  UMA_HISTOGRAM_BOOLEAN(kNeverTranslateLang, true);
+}
+
+bool TranslateUIDelegate::IsSiteBlacklisted() {
+  std::string host = GetPageHost();
+  return !host.empty() && prefs_->IsSiteBlacklisted(host);
+}
+
+void TranslateUIDelegate::SetSiteBlacklist(bool value) {
+  std::string host = GetPageHost();
+  if (host.empty())
+    return;
+
+  if (value)
+    prefs_->BlacklistSite(host);
+  else
+    prefs_->RemoveSiteFromBlacklist(host);
+
+  UMA_HISTOGRAM_BOOLEAN(kNeverTranslateSite, true);
+}
+
+bool TranslateUIDelegate::ShouldAlwaysTranslate() {
+  return prefs_->IsLanguagePairWhitelisted(GetOriginalLanguageCode(),
+                                           GetTargetLanguageCode());
+}
+
+void TranslateUIDelegate::SetAlwaysTranslate(bool value) {
+  const std::string& original_lang = GetOriginalLanguageCode();
+  const std::string& target_lang = GetTargetLanguageCode();
+  if (value)
+    prefs_->WhitelistLanguagePair(original_lang, target_lang);
+  else
+    prefs_->RemoveLanguagePairFromWhitelist(original_lang, target_lang);
+
+  UMA_HISTOGRAM_BOOLEAN(kAlwaysTranslateLang, true);
+}
+
+std::string TranslateUIDelegate::GetPageHost() {
+  content::NavigationEntry* entry =
+      web_contents()->GetController().GetActiveEntry();
+  return entry ? entry->GetURL().HostNoBrackets() : std::string();
+}