/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape 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/NPL/
 *
 * 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 Mozilla Communicator client code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *  Bill Law    <law@netscape.com>
 *  Blake Ross  <blake@netscape.com>
 *
 * 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
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 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */
 
#include "nsISupports.idl"

/* nsINativeAppSupport
 *
 * This "pseudo" (in the XPCOM sense) interface provides for
 * platform-specific general aplication support:
 *  o It subsumes the old "NS_CanRun" and "NS_CreateSplashScreen" 
 *    functions that managed display of the application splash 
 *    screen at startup.
 *  o It manages the details of the simple DDE communication 
 *    supported on the Win32 platform (it is the addition of this 
 *    item that prompted the creation of this interface.
 *
 * Due to the nature of the beast, this interface is not a full-blown
 * XPCOM component.  The primary reason is that objects that implement
 * this interface generally must be operational *before* XPCOM (or any
 * of the rest of Mozilla) are initialized.  As a result, this 
 * interface is instantiated by somewhat unconventional means.
 *
 * To create the implementor of this interface, you call the function
 * NS_CreateNativeAppSupport.  This is done in the startup code
 * in mozilla/xpfe/bootstrap.
 *
 * You can use this interface by obtaining an instance via the
 * "nativeAppSupport" attribute of the nsIAppShellService
 * interface/service.
 *
 * The interface provides these functions:
 *  start - You call this to inform the native app support that the  
 *          application is starting.  In addition, it serves as a
 *          query as to whether the application should continue to
 *          run.  In that respect, it is rougly equivalent to the
 *          NS_CanStart function, which it replaces.
 *
 *          If the returned boolean result is PR_FALSE, then the
 *          application should exit without further processing.  In
 *          such cases, the returned nsresult indicates whether the
 *          reason to exit is due to an error or not.
 *
 *          Win32 Note: In the case of starting a second instance
 *                      of this executable, this function will return
 *                      PR_FALSE and nsresult==NS_OK.  This means that
 *                      the command line arguments have been
 *                      successfully passed to the instance of the
 *                      application acting as a DDE server.
 *
 *  stop - You call this to inform the native app support that the
 *         application *wishes* to terminate.  If the returned boolean
 *         value is PR_FALSE, then the application should continue
 *         (as if there were still additional top-level windows open).
 *         
 *         Win32 Note: If this is the instance of the application
 *                     acting as the DDE server, and there are current
 *                     DDE conversations active with other instances
 *                     acting as DDE clients, then this function will
 *                     return PR_FALSE.
 * 
 *  quit - Like Stop, but this method *forces* termination (or more 
 *         precisely, indicates that the application is about to be
 *         terminated regardless of what a call to Stop might have
 *         returned.
 *
 *         This method is intended to be called when the user selects
 *         the "Quit" option (close all windows and exit).
 *
 *         Win32 Note: Stop is problematic in the case of "Quit" (close
 *                     all windows and exit the application) because
 *                     either we don't Quit or (potentially) we lose
 *                     requests coming from other instances of the
 *                     application.  The strategy is to give preference
 *                     to the user's explicit Quit request.  In the
 *                     unlikely event that a request is pending from
 *                     another instance of the application, then such
 *                     requests are essentially ignored.  This is
 *                     roughly equivalent to handling that request by
 *                     opening a new window, followed by immediately
 *                     closing it.  Since this is the same as if the
 *                     request came in immediately before the Quit
 *                     call (versus immediately after it), no harm.
 *
 *                     There is an exposure here: Upon return from this
 *                     function, any DDE connect request (for Mozilla)
 *                     will fail and other instances of the application
 *                     will start up as a DDE server.  In that case,
 *                     those instances may do things that conflict with
 *                     the subsequent shutting down of the instance that
 *                     is quitting.  For this reason, the call to Quit
 *                     should be deferred as long as possible.
 *
 *  showSplashScreen - Causes the platform-specific splash screen to be
 *                     displayed.  This is a replacement for the old
 *                     method of invoking the Show() method on the
 *                     nsISplashScreen interface obtained by calling
 *                     NS_CreateSplashScreen.
 *
 *  hideSplashScreen - Causes the splash screen to be removed (if it is
 *                     being shown).  This replaces the old method of
 *                     invoking the Hide() method on the nsISplashScreen
 *                     interface maintained by the app shell service.
 *
 *  startServerMode -  Method that "starts" server mode.  Typically, this
 *                     will create a hidden Navigator window (and then close
 *                     it) in order to fill the cache, load shared libraries,
 *                     etc.  Note that this method does not set the
 *                     isServerMode attribute, nor does setting that attribute
 *                     "start" server mode (at least in the same sense as is
 *                     meant by this method).  Basically, native code will
 *                     set isServerMode to tell nsAppRunner; nsAppRunner will
 *                     then call this method (implemented back in the same
 *                     native code) at the appropriate time for any additional
 *                     server-mode startup to be completed.
 *
 *  onLastWindowClosing -  Called when the last window is closed. Used as a
 *                         "soft" shutdown, passwords are flushed.
 *
 * This interface has these attributes:
 *  isServerMode - Boolean attribute indicating whether the application
 *                 is running in "server mode." Server mode means the
 *                 application was started to pre-load shared-libraries,
 *                 initialize services, and open a hidden Navigator window
 *                 in order to quickly surface that window when the user
 *                 launches the application in the normal mode.  This
 *                 mode is currently Win32-only (and may really only make
 *                 sense there) and is intended to be initiated from the
 *                 Windows startup folder at system initialization.
 *
 *
 */

interface nsIXULWindow;
interface nsICmdLineService;

[scriptable, uuid(5fdf8480-1f98-11d4-8077-00600811a9c3)]
interface nsINativeAppSupport : nsISupports {
    // Startup/shutdown.
    boolean start();
    boolean stop();
    void    quit();

    [noscript] void ensureProfile(in nsICmdLineService aCmdService);

    // Splash screen functions.
    void showSplashScreen();
    void hideSplashScreen();

    // Server mode.
    attribute boolean isServerMode;
    attribute boolean shouldShowUI;
    void startServerMode();

    void onLastWindowClosing();
    void ReOpen();
};
