Bug #305020 --> Allow Dynamic dictionary switching from the compose window

sr=bienvenu

mail/components/compose/content/MsgComposeCommands.js

@@ -1334,7 +1334,8 @@ function ComposeStartup(recycled, aParams)
            initLocalFontFaceMenu(fontsList);
         }
         // Do setup common to Message Composer and Web Composer
-        EditorSharedStartup();   
+        EditorSharedStartup();
+        initLanguageMenu();
       }
 
       var msgCompFields = gMsgCompose.compFields;
@@ -2141,6 +2142,113 @@ function ToggleInlineSpellChecker(target)
   }
 }
 
+function initLanguageMenu()
+{
+  var spellChecker = Components.classes['@mozilla.org/spellchecker/myspell;1'].getService(Components.interfaces.mozISpellCheckingEngine);
+  var o1 = {};
+  var o2 = {};
+  var languageMenuList = document.getElementById('LanguageMenulist');
+
+  // Get the list of dictionaries from
+  // the spellchecker.
+
+  spellChecker.getDictionaryList(o1, o2);
+
+  var dictList = o1.value;
+  var count    = o2.value;
+
+  // Load the string bundles that will help us map
+  // RFC 1766 strings to UI strings.
+
+  // Load the language string bundle.
+  var languageBundle = document.getElementById("languageBundle");
+  var regionBundle;
+  // If we have a language string bundle, load the region string bundle.
+  if (languageBundle)
+    regionBundle = document.getElementById("regionBundle");
+
+  var menuStr2;
+  var isoStrArray;
+  var defaultItem = null;
+  var langId;
+  var i;
+
+  for (i = 0; i < dictList.length; i++)
+  {
+    try {
+      langId = dictList[i];
+      isoStrArray = dictList[i].split("-");
+
+      dictList[i] = new Array(2); // first subarray element - pretty name
+      dictList[i][1] = langId;    // second subarray element - language ID
+
+      if (languageBundle && isoStrArray[0])
+        dictList[i][0] = languageBundle.getString(isoStrArray[0].toLowerCase());
+
+      if (regionBundle && dictList[i][0] && isoStrArray.length > 1 && isoStrArray[1])
+      {
+        menuStr2 = regionBundle.getString(isoStrArray[1].toLowerCase());
+        if (menuStr2)
+          dictList[i][0] = dictList[i][0] + "/" + menuStr2;
+      }
+
+      if (!dictList[i][0])
+        dictList[i][0] = dictList[i][1];
+    } catch (ex) {
+      // GetString throws an exception when
+      // a key is not found in the bundle. In that
+      // case, just use the original dictList string.
+
+      dictList[i][0] = dictList[i][1];
+    }
+  }
+
+  // note this is not locale-aware collation, just simple ASCII-based sorting
+  // we really need to add locale-aware JS collation
+  dictList.sort();
+ 
+  // now select the dictionary we are currently using
+  for (i = 0; i < dictList.length; i++)
+  {
+    var item = document.createElement("menuitem");
+    item.setAttribute("label", dictList[i][0]);
+    item.setAttribute("value", dictList[i][1]);
+    item.setAttribute('type', 'radio');
+    item.setAttribute('oncommand', "changeLanguage(event)");
+    languageMenuList.appendChild(item);
+  }      
+}
+
+function onShowDictionaryMenu()
+{
+  var curLang = sPrefs.getComplexValue("spellchecker.dictionary", Components.interfaces.nsISupportsString).data;
+  var languageMenuList = document.getElementById('LanguageMenulist');
+
+  var languages = languageMenuList.getElementsByAttribute('value', curLang);
+  languages[0].setAttribute('checked', true);
+}
+
+function changeLanguage(event)
+{
+  // We need to change the dictionary language and if we are using inline spell check,
+  // recheck the message
+
+  var spellChecker = Components.classes['@mozilla.org/spellchecker/myspell;1'].getService(Components.interfaces.mozISpellCheckingEngine);
+  if (spellChecker.dictionary != event.target.value)
+  {
+    spellChecker.dictionary = event.target.value;
+    var str = Components.classes["@mozilla.org/supports-string;1"]
+              .createInstance(Components.interfaces.nsISupportsString);
+    str.data = event.target.value;
+    sPrefs.setComplexValue("spellchecker.dictionary", Components.interfaces.nsISupportsString, str);
+
+    // now check the document over again with the new dictionary
+    InlineSpellChecker.checkDocument(window.content.document);
+  }
+
+  event.preventBubble();
+}
+
 function ToggleReturnReceipt(target)
 {
     var msgCompFields = gMsgCompose.compFields;

mail/components/compose/content/messengercompose.xul

@@ -66,7 +66,8 @@
 
 <stringbundleset id="stringbundleset">
   <stringbundle id="bundle_composeMsgs" src="chrome://messenger/locale/messengercompose/composeMsgs.properties"/>
-  <stringbundle id="bundle_messenger" src="chrome://messenger/locale/messenger.properties"/>
+  <stringbundle id="bundle_messenger"   src="chrome://messenger/locale/messenger.properties"/>
+  <stringbundle id="languageBundle"     src="chrome://global/locale/languageNames.properties"/>
 </stringbundleset>
 
 <script type="application/x-javascript" src="chrome://communicator/content/printing.js"/>
@@ -602,9 +603,13 @@
          </menupopup>
     </toolbarbutton>
     
-    <toolbarbutton class="toolbarbutton-1"
+    <toolbarbutton class="toolbarbutton-1" type="menu-button"
                id="spellingButton" label="&spellingButton.label;" 
-               command="cmd_spelling"/>
+               command="cmd_spelling">
+      <menupopup id="LanguageMenulist" onpopupshowing="onShowDictionaryMenu();">
+        <!-- this popup gets dynamically generated -->
+      </menupopup>
+    </toolbarbutton>
     
     <toolbarbutton class="toolbarbutton-1" type="menu-button"
                id="button-save" label="&saveButton.label;" 

mail/components/preferences/compose.js

@@ -259,7 +259,7 @@ var gComposePane = {
 
   initLanguageMenu: function ()
   {
-    this.mSpellChecker = Components.classes['@mozilla.org/spellchecker/myspell;1'].createInstance(Components.interfaces.mozISpellCheckingEngine);
+    this.mSpellChecker = Components.classes['@mozilla.org/spellchecker/myspell;1'].getService(Components.interfaces.mozISpellCheckingEngine);
     var o1 = {};
     var o2 = {};
     var languageMenuList = document.getElementById('LanguageMenulist');