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/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "nsISupports.idl"

interface mozINewMailListener;

typedef long newMailListenerFlag;

[scriptable, uuid(7fef9018-c9f1-4cbd-b57c-d6555cf3a668)]
/** New mail notification service. This service watches all the relevant
 * folder and message change events, preferences etc. and keeps track of
 * the specific messages the user wants notifications for.
 * NOTE: THIS INTERFACE IS UNDER ACTIVE DEVELOPMENT AND SUBJECT TO CHANGE,
 * see https://bugzilla.mozilla.org/show_bug.cgi?id=715799
 * Registered mozINewMailListeners are called when the message count or
 * specific list of notified messages changes.
 * ** Should also document the observer service callback that allows
 *    plugins to override notifications by folder
 */
interface mozINewMailNotificationService : nsISupports {
  /**
   * @name Notification flags
   * These flags determine which notifications will be sent.
   * @{
   */
  /// mozINewMailListener::count notification
  const newMailListenerFlag count = 0x1;

  /// mozINewMailListener::messages notification
  const newMailListenerFlag messages = 0x2;

  /** @} */

  /**
   * addListener - Register a mozINewMailListener to receive callbacks
   *               when the count or list of notification-worthy messages
   *               changes.
   * @param aListener   mozINewMailListener to call back
   * @param flags       Bitmask of newMailListenerFlag values indicating
   *                    the particular callbacks this listener wants.
   *                    If the listener is already registered with the
   *                    notification service, the existing set of flags is
   *                    replaced by the values passed in this parameter.
   */
  void addListener(in mozINewMailListener aListener,
                   in newMailListenerFlag flags);
  /**
   * removeListener - remove a listener from the service
   * @param aListener  The listener to remove
   */
  void removeListener(in mozINewMailListener aListener);

  /// The current count of notification-worth unread messages
  readonly attribute long messageCount;
};