Enables the user to select multiple languages for spellchecking (UI)

chrome/browser/renderer_context_menu/spellchecker_submenu_observer_hunspell.cc

Index: chrome/browser/renderer_context_menu/spellchecker_submenu_observer_hunspell.cc
diff --git a/chrome/browser/renderer_context_menu/spellchecker_submenu_observer_hunspell.cc b/chrome/browser/renderer_context_menu/spellchecker_submenu_observer_hunspell.cc
index ca943f5ae914b92be494ac417e92adb9d78627c0..102153fa9a66d453f6788aebd1939b15475bcf7c 100644
--- a/chrome/browser/renderer_context_menu/spellchecker_submenu_observer_hunspell.cc
+++ b/chrome/browser/renderer_context_menu/spellchecker_submenu_observer_hunspell.cc
@@ -4,16 +4,21 @@
 
 #include "chrome/browser/renderer_context_menu/spellchecker_submenu_observer.h"
 
+#include <algorithm>
+
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/prefs/pref_member.h"
 #include "base/prefs/pref_service.h"
+#include "base/strings/string_split.h"
+#include "base/strings/string_util.h"
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/renderer_context_menu/render_view_context_menu.h"
 #include "chrome/browser/spellchecker/spellcheck_service.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/pref_names.h"
+#include "chrome/common/spellcheck_common.h"
 #include "chrome/common/spellcheck_messages.h"
 #include "chrome/grit/generated_resources.h"
 #include "content/public/browser/render_view_host.h"
@@ -31,7 +36,7 @@ SpellCheckerSubMenuObserver::SpellCheckerSubMenuObserver(
     : proxy_(proxy),
       submenu_model_(delegate),
       language_group_(group),
-      language_selected_(0) {
+      num_selected_languages_(0) {
   DCHECK(proxy_);
 }
 
@@ -45,17 +50,25 @@ void SpellCheckerSubMenuObserver::InitMenu(
   // Add available spell-checker languages to the sub menu.
   content::BrowserContext* browser_context = proxy_->GetBrowserContext();
   DCHECK(browser_context);
-  language_selected_ =
+  num_selected_languages_ =
       SpellcheckService::GetSpellCheckLanguages(browser_context, &languages_);
   DCHECK(languages_.size() <
          IDC_SPELLCHECK_LANGUAGES_LAST - IDC_SPELLCHECK_LANGUAGES_FIRST);
   const std::string app_locale = g_browser_process->GetApplicationLocale();
-  for (size_t i = 0; i < languages_.size(); ++i) {
-    base::string16 display_name(
-        l10n_util::GetDisplayNameForLocale(languages_[i], app_locale, true));
-    submenu_model_.AddRadioItem(IDC_SPELLCHECK_LANGUAGES_FIRST + i,
-                                display_name,
-                                language_group_);
+
+  if (chrome::spellcheck_common::IsMultilingualSpellcheckEnabled()) {
+    for (size_t i = 0; i < languages_.size(); ++i) {
+      submenu_model_.AddCheckItem(
+          IDC_SPELLCHECK_LANGUAGES_FIRST + i,
+          l10n_util::GetDisplayNameForLocale(languages_[i], app_locale, true));
+    }
+  } else {
+    for (size_t i = 0; i < languages_.size(); ++i) {
+      submenu_model_.AddRadioItem(
+          IDC_SPELLCHECK_LANGUAGES_FIRST + i,
+          l10n_util::GetDisplayNameForLocale(languages_[i], app_locale, true),
+          language_group_);
+    }
   }
 
   // Add an item that opens the 'fonts and languages options' page.
@@ -73,8 +86,11 @@ void SpellCheckerSubMenuObserver::InitMenu(
   // Add a check item "Ask Google for spelling suggestions" item. (This class
   // does not handle this item because the SpellingMenuObserver class handles it
   // on behalf of this class.)
-  submenu_model_.AddCheckItem(IDC_CONTENT_CONTEXT_SPELLING_TOGGLE,
-      l10n_util::GetStringUTF16(IDS_CONTENT_CONTEXT_SPELLING_ASK_GOOGLE));
+  if (!chrome::spellcheck_common::IsMultilingualSpellcheckEnabled()) {
+    submenu_model_.AddCheckItem(
+        IDC_CONTENT_CONTEXT_SPELLING_TOGGLE,
+        l10n_util::GetStringUTF16(IDS_CONTENT_CONTEXT_SPELLING_ASK_GOOGLE));
+  }
 
   // Add a check item "Automatically correct spelling".
   const base::CommandLine* command_line =
@@ -117,7 +133,8 @@ bool SpellCheckerSubMenuObserver::IsCommandIdChecked(int command_id) {
 
   if (command_id >= IDC_SPELLCHECK_LANGUAGES_FIRST &&
       command_id < IDC_SPELLCHECK_LANGUAGES_LAST) {
-    return language_selected_ == command_id - IDC_SPELLCHECK_LANGUAGES_FIRST;
+    return num_selected_languages_ >
+           static_cast<size_t>(command_id - IDC_SPELLCHECK_LANGUAGES_FIRST);
   }
 
   // Check box for 'Check Spelling while typing'.
@@ -157,14 +174,32 @@ void SpellCheckerSubMenuObserver::ExecuteCommand(int command_id) {
   // Check to see if one of the spell check language ids have been clicked.
   Profile* profile = Profile::FromBrowserContext(proxy_->GetBrowserContext());
   DCHECK(profile);
+
   if (command_id >= IDC_SPELLCHECK_LANGUAGES_FIRST &&
       command_id < IDC_SPELLCHECK_LANGUAGES_LAST) {
-    const size_t language = command_id - IDC_SPELLCHECK_LANGUAGES_FIRST;
-    if (profile && language < languages_.size()) {
-      StringPrefMember dictionary_language;
-      dictionary_language.Init(prefs::kSpellCheckDictionary,
-                               profile->GetPrefs());
-      dictionary_language.SetValue(languages_[language]);
+    PrefService* prefs = profile->GetPrefs();
+    size_t language = command_id - IDC_SPELLCHECK_LANGUAGES_FIRST;
+    DCHECK_LT(language, languages_.size());
+
+    if (chrome::spellcheck_common::IsMultilingualSpellcheckEnabled()) {
+      std::vector<std::string> dictionary_languages =
+          chrome::spellcheck_common::GetDictionaryLanguagesPref(prefs);
+
+      auto found_language =
+          std::find(dictionary_languages.begin(), dictionary_languages.end(),
+                    languages_[language]);
+
+      if (found_language != dictionary_languages.end())
+        dictionary_languages.erase(found_language);
+      else
+        dictionary_languages.push_back(languages_[language]);
+
+      prefs->SetString(
+          prefs::kSpellCheckDictionaries,
+          JoinString(dictionary_languages,
+                     chrome::spellcheck_common::kDictionaryLanguagesSeparator));
+    } else {
+      prefs->SetString(prefs::kSpellCheckDictionary, languages_[language]);
     }
     return;
   }