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/* 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 nsIUrlListener;
interface nsIMsgWindow;
interface nsIWebProgressListener;

[scriptable, uuid(D1B43428-B631-4629-B691-AB0E01A2DB4B)]
interface nsIMsgShutdownTask : nsISupports
{
  /**
   * Inform the caller wheter or not the task needs to be run. This method
   * gives the task the flexibility to cancel running a task on shutdown
   * if nothing needs to be run.
   */
  readonly attribute boolean needsToRunTask;

  /**
   * At shutdown-time, this function will be called to all registered implementors.
   * Shutdown will be temporarily postponed until |OnStopRequest()| has been called
   * on the passed in url-listener. 
   * @param inUrlListener The URL listener to report events to.
   * @param inMsgWindow The current message window to allow for posing dialogs.
   * @return If the shutdown URL was run or not. If the URL is running, the task
   *         will be responsible for notifying |inUrlListener| when the task is completed.
   */
  boolean doShutdownTask(in nsIUrlListener inUrlListener, in nsIMsgWindow inMsgWindow);
  
  /**
   * Get the displayable name of the current task. This textual information will be
   * shown to the user so they know what shutdown task is being performed.
   * @return The name of the current task being performed.
   */
  AString getCurrentTaskName();
};

[scriptable, uuid(483C8ABB-ECF9-48A3-A394-2C604B603BD5)]
interface nsIMsgShutdownService : nsISupports
{
  /**
   * Get the number of tasks that will need to be processed at shutdown time.
   * @return The number of shutdown tasks to do.
   */ 
  long getNumTasks();
  
  /**
   * Start the shutdown tasks. 
   */
  void startShutdownTasks();
  
  /**
   * Tell the service to stop running tasks and go ahead and shutdown the application.
   */
  void cancelShutdownTasks();
  
  /**
   * Set the shutdown listener.
   */
  void setShutdownListener(in nsIWebProgressListener inListener);
  
  /**
   * Set the status text of the shutdown progress dialog.
   */
  void setStatusText(in AString inStatusString);
};