gecko/toolkit/components/startup/src/nsTryToClose.js

/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is the nsTryToClose component.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Corporation
 * Portions created by the Initial Developer are Copyright (C) 2006
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Michael Wu <flamingice@sourmilk.net>  (original author)
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

const Cc = Components.classes;
const Ci = Components.interfaces;
const Cr = Components.results;

const CID = Components.ID("{b69155f4-a8bf-453d-8653-91d1456e1d3d}");
const CONTRACT_ID = "@mozilla.org/appshell/trytoclose;1"
const CLASS_NAME = "tryToClose Service";

function TryToClose() {
}

TryToClose.prototype = {
  observe: function (aSubject, aTopic, aData) {
    switch (aTopic) {
    case "app-startup":
      var obsService = Cc["@mozilla.org/observer-service;1"].
                       getService(Ci.nsIObserverService);
      obsService.addObserver(this, "quit-application-requested", true);
      break;
    case "quit-application-requested":
      var windowMediator = Cc['@mozilla.org/appshell/window-mediator;1'].
                           getService(Ci.nsIWindowMediator);
      var enumerator = windowMediator.getEnumerator(null);
      while (enumerator.hasMoreElements()) {
        var domWindow = enumerator.getNext();
        if (("tryToClose" in domWindow) && !domWindow.tryToClose()) {
          aSubject.QueryInterface(Ci.nsISupportsPRBool);
          aSubject.data = true;
          break;
        }
      }
      break;
    }
  },

  QueryInterface: function(aIID) {
    if (!aIID.equals(Ci.nsIObserver) &&
        !aIID.equals(Ci.nsISupportsWeakReference) && 
        !aIID.equals(Ci.nsISupports))
      throw Cr.NS_ERROR_NO_INTERFACE;
    return this;
  }
};

const TryToCloseFactory = {
  createInstance: function(aOuter, aIID) {
    if (aOuter != null)
      throw Cr.NS_ERROR_NO_AGGREGATION;
    
    return (new TryToClose()).QueryInterface(aIID);
  }
};

const TryToCloseModule = {
  registerSelf: function(aCompMgr, aFileSpec, aLocation, aType) {
    aCompMgr.QueryInterface(Ci.nsIComponentRegistrar);
    aCompMgr.registerFactoryLocation(CID, CLASS_NAME, CONTRACT_ID,
                                     aFileSpec, aLocation, aType);

    var catMan = Cc["@mozilla.org/categorymanager;1"].
                 getService(Ci.nsICategoryManager);
    catMan.addCategoryEntry("app-startup", CLASS_NAME, "service," + CONTRACT_ID, true, true);
  },

  unregisterSelf: function(aCompMgr, aLocation, aType) {
    aCompMgr.QueryInterface(Ci.nsIComponentRegistrar);
    aCompMgr.unregisterFactoryLocation(CID, aLocation);

    var catMan = Cc["@mozilla.org/categorymanager;1"].
                 getService(Ci.nsICategoryManager);
    catMan.deleteCategoryEntry( "app-startup", "service," + CONTRACT_ID, true);
  },

  getClassObject: function(aCompMgr, aCID, aIID) {
    if (aCID.equals(CID))
      return TryToCloseFactory;
    
    throw Cr.NS_ERROR_NOT_REGISTERED;
  },

  canUnload: function(aCompMgr) {
    return true;
  }
};

function NSGetModule(aCompMgr, aFileSpec) {
  return TryToCloseModule;
}