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

chrome/browser/resources/options/language_options.js

 // Copyright (c) 2012 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.
 
 // TODO(kochi): Generalize the notification as a component and put it
 // in js/cr/ui/notification.js .
 
 cr.define('options', function() {
   /** @const */ var Page = cr.ui.pageManager.Page;
   /** @const */ var PageManager = cr.ui.pageManager.PageManager;
@@ skipping 42 matching lines @@
 
   /**
    * The preference key that is a string that describes the spell check
    * dictionary language, like "en-US".
    * @type {string}
    * @const
    */
   var SPELL_CHECK_DICTIONARY_PREF = 'spellcheck.dictionary';
 
   /**
+   * The preference key that describes the spell check dictionary languages
+   * currently selected (as a comma separated string, like "en-US,sl-SI").
+   * @type {string}

[Dan Beam, 2015/03/02 22:40:08]

nit: @const {string} is shorter (and a newer syntax)

+   * @const
+   */
+  var SPELL_CHECK_DICTIONARIES_PREF = 'spellcheck.dictionaries';
+
+  /**
    * The preference that indicates if the Translate feature is enabled.
    * @type {string}
    * @const
    */
   var ENABLE_TRANSLATE = 'translate.enabled';
 
   /////////////////////////////////////////////////////////////////////////////
   // LanguageOptions class:
 
   /**
@@ skipping 64 matching lines @@
 
     /**
      * The preference is a string that describes the spell check dictionary
      * language, like "en-US".
      * @type {string}
      * @private
      */
     spellCheckDictionary_: '',
 
     /**
+     * The dictionary of currently selected spell check dictionary languages,
+     * like "{"en-US": true, "sl-SI": true}".

[Dan Beam, 2015/03/02 22:40:08]

nit: remove quotes around the dictionary, e.g. 

  like {"en-US": true, "sl-SI": true}.

+     * @type {Object}
+     * @private
+     */
+    spellCheckDictionaries_: {},
+
+    /**
      * The map of language code to input method IDs, like:
      * {'ja': ['mozc', 'mozc-jp'], 'zh-CN': ['pinyin'], ...}
      * @type {Object}
      * @private
      */
     languageCodeToInputMethodIdsMap_: {},
 
     /**
      * The value that indicates if Translate feature is enabled or not.
      * @type {boolean}
@@ skipping 23 matching lines @@
         this.initializeLanguageCodeToInputMethodIdsMap_();
       }
 
       var checkbox = $('offer-to-translate-in-this-language');
       checkbox.addEventListener('click',
           this.handleOfferToTranslateCheckboxClick_.bind(this));
 
       Preferences.getInstance().addEventListener(
           TRANSLATE_BLOCKED_LANGUAGES_PREF,
           this.handleTranslateBlockedLanguagesPrefChange_.bind(this));
-      Preferences.getInstance().addEventListener(SPELL_CHECK_DICTIONARY_PREF,
+
+      if (loadTimeData.getBoolean('enableMultilingualSpellChecker')) {
+        Preferences.getInstance().addEventListener(
+            SPELL_CHECK_DICTIONARIES_PREF,
+            this.handleSpellCheckDictionariesPrefChange_.bind(this));
+      } else {
+        Preferences.getInstance().addEventListener(SPELL_CHECK_DICTIONARY_PREF,
           this.handleSpellCheckDictionaryPrefChange_.bind(this));
+      }
+
       Preferences.getInstance().addEventListener(ENABLE_TRANSLATE,
           this.handleEnableTranslatePrefChange_.bind(this));
       this.translateSupportedLanguages_ =
           loadTimeData.getValue('translateSupportedLanguages');
 
       // Set up add button.
       var onclick = function(e) {
         // Add the language without showing the overlay if it's specified in
         // the URL hash (ex. lang_add=ja).  Used for automated testing.
         var match = document.location.hash.match(/\blang_add=([\w-]+)/);
@@ skipping 31 matching lines @@
         // Handle spell check enable/disable.
         if (!cr.isMac) {
           Preferences.getInstance().addEventListener(
               ENABLE_SPELL_CHECK_PREF,
               this.updateEnableSpellCheck_.bind(this));
         }
       }
 
       // Handle clicks on "Use this language for spell checking" button.
       if (!cr.isMac) {
-        var spellCheckLanguageButton = getRequiredElement(
-            'language-options-spell-check-language-button');
-        spellCheckLanguageButton.addEventListener(
-            'click',
-            this.handleSpellCheckLanguageButtonClick_.bind(this));
+        if (loadTimeData.getBoolean('enableMultilingualSpellChecker')) {
+          var spellCheckLanguageCheckbox = getRequiredElement(
+              'language-options-spell-check-language-checkbox');
+          spellCheckLanguageCheckbox.addEventListener(
+              'click',
+              this.handleSpellCheckLanguageCheckboxClick_.bind(this));
+        } else {
+          var spellCheckLanguageButton = getRequiredElement(
+              'language-options-spell-check-language-button');
+          spellCheckLanguageButton.addEventListener(
+              'click',
+              this.handleSpellCheckLanguageButtonClick_.bind(this));
+        }
       }
 
       if (cr.isChromeOS) {
         $('language-options-ui-restart-button').onclick = function() {
           chrome.send('uiLanguageRestart');
         };
       }
 
       $('language-confirm').onclick =
           PageManager.closeOverlay.bind(PageManager);
@@ skipping 162 matching lines @@
       }
 
       this.updateOfferToTranslateCheckbox_(languageCode);
 
       if (cr.isWindows || cr.isChromeOS)
         this.updateUiLanguageButton_(languageCode);
 
       this.updateSelectedLanguageName_(languageCode);
 
       if (!cr.isMac)
-        this.updateSpellCheckLanguageButton_(languageCode);
+        this.updateSpellCheckLanguageControls_(languageCode);
 
       if (cr.isChromeOS)
         this.updateInputMethodList_(languageCode);
 
       this.updateLanguageListInAddLanguageOverlay_();
     },
 
     /**
      * Handles languageOptionsList's save event.
      * @param {Event} e Save event.
@@ skipping 156 matching lines @@
         showMutuallyExclusiveNodes(
             [uiLanguageButton, uiLanguageMessage, uiLanguageNotification], 1);
       }
     },
 
     /**
      * Updates the spell check language button.
      * @param {string} languageCode Language code (ex. "fr").
      * @private
      */
-    updateSpellCheckLanguageButton_: function(languageCode) {
+    updateSpellCheckLanguageControls_: function(languageCode) {
       var spellCheckLanguageSection = $('language-options-spellcheck');
       var spellCheckLanguageButton =
           $('language-options-spell-check-language-button');
+      var spellCheckLanguageCheckboxDiv =
+          $('language-options-spell-check-language-checkbox-div');
+      var spellCheckLanguageCheckbox =
+          $('language-options-spell-check-language-checkbox');
       var spellCheckLanguageMessage =
           $('language-options-spell-check-language-message');
       var dictionaryDownloadInProgress =
           $('language-options-dictionary-downloading-message');
       var dictionaryDownloadFailed =
           $('language-options-dictionary-download-failed-message');
       var dictionaryDownloadFailHelp =
           $('language-options-dictionary-download-fail-help-message');
+
       spellCheckLanguageSection.hidden = false;
       spellCheckLanguageMessage.hidden = true;
       spellCheckLanguageButton.hidden = true;
+      spellCheckLanguageCheckboxDiv.hidden = true;
       dictionaryDownloadInProgress.hidden = true;
       dictionaryDownloadFailed.hidden = true;
       dictionaryDownloadFailHelp.hidden = true;
 
-      if (languageCode == this.spellCheckDictionary_) {
-        if (!(languageCode in this.spellcheckDictionaryDownloadStatus_)) {
-          spellCheckLanguageMessage.textContent =
-              loadTimeData.getString('isUsedForSpellChecking');
-          showMutuallyExclusiveNodes(
-              [spellCheckLanguageButton, spellCheckLanguageMessage], 1);
-        } else if (this.spellcheckDictionaryDownloadStatus_[languageCode] ==
-                       DOWNLOAD_STATUS.IN_PROGRESS) {
+      spellCheckLanguageCheckbox.checked = false;
+
+      if (!languageCode)
+        return;
+
+      if (languageCode in loadTimeData.getValue('spellCheckLanguageCodeSet')) {
+        if (loadTimeData.getBoolean('enableMultilingualSpellChecker')) {
+          spellCheckLanguageCheckbox.languageCode = languageCode;
+          if (this.spellCheckDictionaries_.hasOwnProperty(languageCode))
+            spellCheckLanguageCheckbox.checked = true;

[Dan Beam, 2015/03/02 22:40:08]

nit:

  spellCheckLanguageCheckbox.checked = 
      this.spellCheckDictionaries_.hasOwnProperty(languageCode);

if this checkbox should also ensuredly be unchecked if languageCode *isn't* in
spellCheckDictionaries_

+
+          spellCheckLanguageCheckboxDiv.hidden = false;
+        } else if (languageCode == this.spellCheckDictionary_) {

[Dan Beam, 2015/03/02 22:40:08]

how will a string ever be equal to a dictionary?  (at least in a non-evil way)

+          if (!(languageCode in this.spellcheckDictionaryDownloadStatus_)) {
+            spellCheckLanguageMessage.textContent =
+                loadTimeData.getString('isUsedForSpellChecking');
+            spellCheckLanguageMessage.hidden = false;
+          }
+        } else {
+          spellCheckLanguageButton.textContent =
+              loadTimeData.getString('useThisForSpellChecking');
+          spellCheckLanguageButton.hidden = false;
+          spellCheckLanguageButton.languageCode = languageCode;
+        }
+

[Dan Beam, 2015/03/02 22:40:08]

var status = this.spellcheckDictionaryDownloadStatus_[languageCode];
// ... re-use status ...

or better yet, use a `switch () {` here

+        if (this.spellcheckDictionaryDownloadStatus_[languageCode] ==
+                DOWNLOAD_STATUS.IN_PROGRESS) {
           dictionaryDownloadInProgress.hidden = false;
         } else if (this.spellcheckDictionaryDownloadStatus_[languageCode] ==
                        DOWNLOAD_STATUS.FAILED) {
-          spellCheckLanguageSection.hidden = true;
-          dictionaryDownloadFailed.hidden = false;
+          showMutuallyExclusiveNodes(
+              [spellCheckLanguageSection, dictionaryDownloadFailed], 1);
           if (this.spellcheckDictionaryDownloadFailures_ > 1)
             dictionaryDownloadFailHelp.hidden = false;
         }
-      } else if (languageCode in
-          loadTimeData.getValue('spellCheckLanguageCodeSet')) {
-        spellCheckLanguageButton.textContent =
-            loadTimeData.getString('useThisForSpellChecking');
-        showMutuallyExclusiveNodes(
-            [spellCheckLanguageButton, spellCheckLanguageMessage], 0);
-        spellCheckLanguageButton.languageCode = languageCode;
-      } else if (!languageCode) {
-        spellCheckLanguageButton.hidden = true;
-        spellCheckLanguageMessage.hidden = true;
       } else {
         spellCheckLanguageMessage.textContent =
             loadTimeData.getString('cannotBeUsedForSpellChecking');
-        showMutuallyExclusiveNodes(
-            [spellCheckLanguageButton, spellCheckLanguageMessage], 1);
+        spellCheckLanguageMessage.hidden = false;
       }
     },
 
     /**
      * Updates the checkbox for stopping translation.
      * @param {string} languageCode Language code (ex. "fr").
      * @private
      */
     updateOfferToTranslateCheckbox_: function(languageCode) {
       var div = $('language-options-offer-to-translate');
@@ skipping 271 matching lines @@
 
     /**
      * Handles spellCheckDictionaryPref change.
      * @param {Event} e Change event.
      * @private
      */
     handleSpellCheckDictionaryPrefChange_: function(e) {
       var languageCode = e.value.value;
       this.spellCheckDictionary_ = languageCode;
       if (!cr.isMac) {
-        this.updateSpellCheckLanguageButton_(
+        this.updateSpellCheckLanguageControls_(
             $('language-options-list').getSelectedLanguageCode());
       }
     },
 
     /**
+     * Updates spellcheck dictionary UI (checkboxes, buttons, and labels) when
+     * preferences change.
+     * @param {Event} e. Preference change event where e.value.value is the
+     * comma separated list of languages currently used for spellchecking.
+     * @private
+     */
+    handleSpellCheckDictionariesPrefChange_: function(e) {
+      if (cr.isMac)
+        return;
+
+      var commaSeparatedLanguageCodes = e.value.value;
+      var languageCodesSplit = commaSeparatedLanguageCodes.split(',');
+
+      this.spellCheckDictionaries_ = {};
+      for (var i = 0; i < languageCodesSplit.length; i++)
+        this.spellCheckDictionaries_[languageCodesSplit[i]] = true;
+
+      this.updateSpellCheckLanguageControls_(
+          $('language-options-list').getSelectedLanguageCode());
+    },
+
+    /**
      * Handles translate.enabled change.
      * @param {Event} e Change event.
      * @private
      */
     handleEnableTranslatePrefChange_: function(e) {
       var enabled = e.value.value;
       this.enableTranslate_ = enabled;
       this.updateOfferToTranslateCheckbox_(
           $('language-options-list').getSelectedLanguageCode());
     },
 
     /**
      * Handles spellCheckLanguageButton click.
      * @param {Event} e Click event.
      * @private
      */
     handleSpellCheckLanguageButtonClick_: function(e) {
       var languageCode = e.target.languageCode;
       // Save the preference.
       Preferences.setStringPref(SPELL_CHECK_DICTIONARY_PREF,
                                 languageCode, true);
       chrome.send('spellCheckLanguageChange', [languageCode]);
       chrome.send('coreOptionsUserMetricsAction',
                   ['Options_Languages_SpellCheck']);
     },
 
     /**
+     * Updates the spellcheck.dictionaries preference with the currently
+     * selected language codes.
+     * @param {Event} e Click event. e.target represents the "Use this language
+     * for spellchecking"
+     * @private
+     */
+    handleSpellCheckLanguageCheckboxClick_: function(e) {
+      var languageCode = e.target.languageCode;
+
+      if (e.target.checked)
+        this.spellCheckDictionaries_[languageCode] = true;
+      else
+        delete this.spellCheckDictionaries_[languageCode];
+
+      var languageCodes = [];
+      for (var currentLanguageCode in this.spellCheckDictionaries_) {
+        if (this.spellCheckDictionaries_.hasOwnProperty(currentLanguageCode))
+          languageCodes.push(currentLanguageCode);
+      }
+
+      Preferences.setStringPref(SPELL_CHECK_DICTIONARIES_PREF,
+                                languageCodes.join(','), true);
+    },
+
+    /**
      * Checks whether it's possible to remove the language specified by
      * languageCode and returns true if possible. This function returns false
      * if the removal causes the number of preload engines to be zero.
      *
      * @param {string} languageCode Language code (ex. "fr").
      * @return {boolean} Returns true on success.
      * @private
      */
     canDeleteLanguage_: function(languageCode) {
       // First create the set of engines to be removed from input methods
@@ skipping 278 matching lines @@
      * @param {string} languageCode The language of the dictionary that just
      *     began downloading.
      * @private
      */
     onDictionaryDownloadBegin_: function(languageCode) {
       this.spellcheckDictionaryDownloadStatus_[languageCode] =
           DOWNLOAD_STATUS.IN_PROGRESS;
       if (!cr.isMac &&
           languageCode ==
               $('language-options-list').getSelectedLanguageCode()) {
-        this.updateSpellCheckLanguageButton_(languageCode);
+        this.updateSpellCheckLanguageControls_(languageCode);
       }
     },
 
     /**
      * A handler for when dictionary for |languageCode| successfully downloaded.
      * @param {string} languageCode The language of the dictionary that
      *     succeeded downloading.
      * @private
      */
     onDictionaryDownloadSuccess_: function(languageCode) {
       delete this.spellcheckDictionaryDownloadStatus_[languageCode];
       this.spellcheckDictionaryDownloadFailures_ = 0;
       if (!cr.isMac &&
           languageCode ==
               $('language-options-list').getSelectedLanguageCode()) {
-        this.updateSpellCheckLanguageButton_(languageCode);
+        this.updateSpellCheckLanguageControls_(languageCode);
       }
     },
 
     /**
      * A handler for when dictionary for |languageCode| fails to download.
      * @param {string} languageCode The language of the dictionary that failed
      *     to download.
      * @private
      */
     onDictionaryDownloadFailure_: function(languageCode) {
       this.spellcheckDictionaryDownloadStatus_[languageCode] =
           DOWNLOAD_STATUS.FAILED;
       this.spellcheckDictionaryDownloadFailures_++;
       if (!cr.isMac &&
           languageCode ==
               $('language-options-list').getSelectedLanguageCode()) {
-        this.updateSpellCheckLanguageButton_(languageCode);
+        this.updateSpellCheckLanguageControls_(languageCode);
       }
     },
 
     /**
      * Converts the language code for Translation. There are some differences
      * between the language set for Translation and that for Accept-Language.
      * @param {string} languageCode The language code like 'fr'.
      * @return {string} The converted language code.
      * @private
      */
@@ skipping 51 matching lines @@
 
   LanguageOptions.onDictionaryDownloadFailure = function(languageCode) {
     LanguageOptions.getInstance().onDictionaryDownloadFailure_(languageCode);
   };
 
   // Export
   return {
     LanguageOptions: LanguageOptions
   };
 });