return null;}function SetupCommandUpdateHandlers(){	var widget;		// folder pane	widget = GetFolderTree();	if ( widget )		widget.controllers.appendController(FolderPaneController);		top.controllers.insertControllerAt(0, DefaultController);}function IsSendUnsentMsgsEnabled(folderResource){  var identity;  if (messenger.sendingUnsentMsgs) // if we're currently sending unsent msgs, disable this cmd.    return false;  try {    if (folderResource) {      // if folderResource is non-null, it is      // resource for the "Unsent Messages" folder      // we're here because we've done a right click on the "Unsent Messages"      // folder (context menu)      var msgFolder = folderResource.QueryInterface(Components.interfaces.nsIMsgFolder);      return (msgFolder.getTotalMessages(false) > 0);    }    else {      var folders = GetSelectedMsgFolders();      if (folders.length > 0) {        identity = getIdentityForServer(folders[0].server);      }    }  }  catch (ex) {    dump("ex = " + ex + "\n");    identity = null;  }  try {    if (!identity) {      var am = Components.classes["@mozilla.org/messenger/account-manager;1"].getService(Components.interfaces.nsIMsgAccountManager);      identity = am.defaultAccount.defaultIdentity;    }    var msgSendlater = Components.classes["@mozilla.org/messengercompose/sendlater;1"].getService(Components.interfaces.nsIMsgSendLater);    var unsentMsgsFolder = msgSendlater.getUnsentMessagesFolder(identity);    return (unsentMsgsFolder.getTotalMessages(false) > 0);  }  catch (ex) {    dump("ex = " + ex + "\n");  }  return false;}function IsRenameFolderEnabled(){    var folderTree = GetFolderTree();    var selection = folderTree.view.selection;    if (selection.count == 1)    {        var startIndex = {};        var endIndex = {};        selection.getRangeAt(0, startIndex, endIndex);        var folderResource = GetFolderResource(folderTree, startIndex.value);        var canRename = GetFolderAttribute(folderTree, folderResource, "CanRename") == "true";        return canRename && isCommandEnabled("cmd_renameFolder");    }    else        return false;}function IsCanSearchMessagesEnabled(){  var folderURI = GetSelectedFolderURI();  var server = GetServer(folderURI);  return server.canSearchMessages;}function IsFolderCharsetEnabled(){  return IsFolderSelected();}function IsPropertiesEnabled(command){   try    {      var folderTree = GetFolderTree();      var folderResource = GetSelectedFolderResource();      // when servers are selected      // it should be "Edit | Properties..."      if (GetFolderAttribute(folderTree, folderResource, "IsServer") == "true")        goSetMenuValue(command, "valueGeneric");      else         goSetMenuValue(command, isNewsURI(folderResource.Value) ? "valueNewsgroup" : "valueFolder");   }   catch (ex)    {      // properties menu failure   }   // properties should be enabled for folders and servers   // but not fake accounts   if (IsFakeAccount())     return false;   var selection = folderTree.view.selection;   return (selection.count == 1);}function IsViewNavigationItemEnabled(){	return IsFolderSelected();}function IsFolderSelected(){    var folderTree = GetFolderTree();    var selection = folderTree.view.selection;    if (selection.count == 1)    {        var startIndex = {};        var endIndex = {};        selection.getRangeAt(0, startIndex, endIndex);        var folderResource = GetFolderResource(folderTree, startIndex.value);        return GetFolderAttribute(folderTree, folderResource, "IsServer") != "true";    }    else        return false;}function IsMessageDisplayedInMessagePane(){  return (!IsMessagePaneCollapsed() && (GetNumSelectedMessages() > 0));}function MsgDeleteFolder(){    var folderTree = GetFolderTree();    var selectedFolders = GetSelectedMsgFolders();    for (var i = 0; i < selectedFolders.length; i++)    {        var selectedFolder = selectedFolders[i];        var folderResource = selectedFolder.QueryInterface(Components.interfaces.nsIRDFResource);        var specialFolder = GetFolderAttribute(folderTree, folderResource, "SpecialFolder");        if (specialFolder != "Inbox" && specialFolder != "Trash")        {            var folder = selectedFolder.QueryInterface(Components.interfaces.nsIMsgFolder);            if (folder.flags & MSG_FOLDER_FLAG_VIRTUAL)            {                if (gCurrentVirtualFolderUri == folderResource.Value)                  gCurrentVirtualFolderUri = null;                var parentResource = selectedFolder.parent.QueryInterface(Components.interfaces.nsIRDFResource);                messenger.DeleteFolders(GetFolderDatasource(), parentResource, folderResource);                continue;            }            var protocolInfo = Components.classes["@mozilla.org/messenger/protocol/info;1?type=" + selectedFolder.server.type].getService(Components.interfaces.nsIMsgProtocolInfo);            // do not allow deletion of special folders on imap accounts            if ((specialFolder == "Sent" ||                 specialFolder == "Drafts" ||                 specialFolder == "Templates" ||                (specialFolder == "Junk" && !CanRenameDeleteJunkMail(GetSelectedFolderURI()))) &&                !protocolInfo.specialFoldersDeletionAllowed)            {                var errorMessage = gMessengerBundle.getFormattedString("specialFolderDeletionErr",                                                    [specialFolder]);                var specialFolderDeletionErrTitle = gMessengerBundle.getString("specialFolderDeletionErrTitle");                promptService.alert(window, specialFolderDeletionErrTitle, errorMessage);                continue;            }               else if (isNewsURI(folderResource.Value))            {                var unsubscribe = ConfirmUnsubscribe(selectedFolder);                if (unsubscribe)                    UnSubscribe(selectedFolder);            }            else            {                var parentResource = selectedFolder.parent.QueryInterface(Components.interfaces.nsIRDFResource);                messenger.DeleteFolders(GetFolderDatasource(), parentResource, folderResource);            }        }    }}function SetFocusThreadPaneIfNotOnMessagePane(){  var focusedElement = WhichPaneHasFocus();  if((focusedElement != GetThreadTree()) &&     (focusedElement != GetMessagePane()))     SetFocusThreadPane();}// 3pane related commands.  Need to go in own file.  Putting here for the moment.function MsgNextMessage(){	GoNextMessage(nsMsgNavigationType.nextMessage, false );}function MsgNextUnreadMessage(){	GoNextMessage(nsMsgNavigationType.nextUnreadMessage, true);}function MsgNextFlaggedMessage(){	GoNextMessage(nsMsgNavigationType.nextFlagged, true);}function MsgNextUnreadThread(){  GoNextMessage(nsMsgNavigationType.nextUnreadThread, true);}function MsgPreviousMessage(){    GoNextMessage(nsMsgNavigationType.previousMessage, false);}function MsgPreviousUnreadMessage(){	GoNextMessage(nsMsgNavigationType.previousUnreadMessage, true);}function MsgPreviousFlaggedMessage(){	GoNextMessage(nsMsgNavigationType.previousFlagged, true);}function MsgGoForward(){  GoNextMessage(nsMsgNavigationType.forward, true);}function MsgGoBack(){  GoNextMessage(nsMsgNavigationType.back, true);}function GetFolderNameFromUri(uri, tree){	var folderResource = RDF.GetResource(uri);	var db = tree.database;	var nameProperty = RDF.GetResource('http://home.netscape.com/NC-rdf#Name');	var nameResult;	try {		nameResult = db.GetTarget(folderResource, nameProperty , true);	}	catch (ex) {		return "";	}	nameResult = nameResult.QueryInterface(Components.interfaces.nsIRDFLiteral);	return nameResult.Value;}function SwitchPaneFocus(event){  var folderTree = GetFolderTree();  var threadTree = GetThreadTree();  var messagePane = GetMessagePane();  // Although internally this is actually a four-pane window, it is presented as  // a three-pane -- the search pane is more of a toolbar.  So, shift among the  // three main panes.  var focusedElement = WhichPaneHasFocus();  if (focusedElement == null)       // focus not on one of the main three panes?    focusedElement = threadTree;    // treat as if on thread tree  if (event && event.shiftKey)  {    // Reverse traversal: Message -> Thread -> Folder -> Message    if (focusedElement == threadTree && !IsFolderPaneCollapsed())      folderTree.focus();    else if (focusedElement != messagePane && !IsMessagePaneCollapsed())      SetFocusMessagePane();    else       threadTree.focus();  }  else  {    // Forward traversal: Folder -> Thread -> Message -> Folder    if (focusedElement == threadTree && !IsMessagePaneCollapsed())      SetFocusMessagePane();    else if (focusedElement != folderTree && !IsFolderPaneCollapsed())      folderTree.focus();    else      threadTree.focus();  }}function SetFocusFolderPane(){    var folderTree = GetFolderTree();    folderTree.focus();}function SetFocusThreadPane(){    var threadTree = GetThreadTree();    threadTree.focus();}function SetFocusMessagePane(){  // XXX hack: to clear the focus on the previous element first focus  // on the message pane element then focus on the main content window  GetMessagePane().focus();  GetMessagePaneFrame().focus();}function is_collapsed(element) {  return (element.getAttribute('state') == 'collapsed');}function isCommandEnabled(cmd){  var selectedFolders = GetSelectedMsgFolders();  var numFolders = selectedFolders.length;  if(numFolders !=1)    return false;  var folder = selectedFolders[0];  if (!folder)    return false;  else    return folder.isCommandEnabled(cmd);}function IsFakeAccount() {  try {    var folderResource = GetSelectedFolderResource();    return (folderResource.Value == "http://home.netscape.com/NC-rdf#PageTitleFakeAccount");  }  catch(ex) {  }  return false;}//// This function checks if the configured junk mail can be renamed or deleted.//function CanRenameDeleteJunkMail(aFolderUri){  if (!aFolderUri)    return false;  // Go through junk mail settings for all servers and see if the folder is set/used by anyone.  try  {    var allServers = accountManager.allServers;    for (var i=0;i<allServers.Count();i++)    {      var currentServer = allServers.GetElementAt(i).QueryInterface(Components.interfaces.nsIMsgIncomingServer);      var settings = currentServer.spamSettings;      // If junk mail control or move junk mail to folder option is disabled then      // allow the folder to be removed/renamed since the folder is not used in this case.      if (!settings.level || !settings.moveOnSpam)        continue;      if (settings.spamFolderURI == aFolderUri)        return false;    }  }  catch(ex)  {      dump("Can't get all servers\n");  }  return true;}