/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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 mozilla.org 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):
 *   Simon Fraser <sfraser@netscape.com>
 *   Kathleen Brade <brade@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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 * 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
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 * 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 ***** */

#include "nsISupports.idl"
#include "nsIObserver.idl"
#include "nsICommandParams.idl"

interface nsIDOMWindow;

/*
 * nsICommandManager is an interface used to executing user-level commands,
 * and getting the state of available commands.
 *
 * Commands are identified by strings, which are documented elsewhere.
 * In addition, the list of required and optional parameters for
 * each command, that are passed in via the nsICommandParams, are
 * also documented elsewhere. (Where? Need a good location for this).
 */
 
 
[scriptable, uuid(080D2001-F91E-11D4-A73C-F9242928207C)]
interface nsICommandManager : nsISupports
{
  /*
   * Register an observer on the specified command. The observer's Observe
   * method will get called when the state (enabled/disbaled, or toggled etc)
   * of the command changes.
   *
   * You can register the same observer on multiple commmands by calling this
   * multiple times.
   */
  void        addCommandObserver(in nsIObserver aCommandObserver,
                                 in string aCommandToObserve);

  /*
   * Stop an observer from observering the specified command. If the observer
   * was also registered on ther commands, they will continue to be observed.
   *
   * Passing an empty string in 'aCommandObserved' will remove the observer
   * from all commands.
   */
  void        removeCommandObserver(in nsIObserver aCommandObserver,
                                    in string aCommandObserved);

  /*
   * Ask the command manager if the specified command is supported.
   * If aTargetWindow is null, the focused window is used.
   *
   */
  boolean     isCommandSupported(in string aCommandName,
                                 in nsIDOMWindow aTargetWindow);

  /*
   * Ask the command manager if the specified command is currently.
   * enabled.
   * If aTargetWindow is null, the focused window is used.
   */
  boolean     isCommandEnabled(in string aCommandName,
                               in nsIDOMWindow aTargetWindow);

  /*
   * Get the state of the specified commands.
   *
   * On input: aCommandParams filled in with values that the caller cares
   * about, most of which are command-specific (see the command documentation
   * for details). One boolean value, "enabled", applies to all commands,
   * and, in return will be set to indicate whether the command is enabled
   * (equivalent to calling isCommandEnabled).
   *
   * aCommandName is the name of the command that needs the state
   * aTargetWindow is the source of command controller 
   *      (null means use focus controller)
   * On output: aCommandParams: values set by the caller filled in with
   * state from the command.
   */
  void        getCommandState(in string aCommandName,
                              in nsIDOMWindow aTargetWindow,
                  /* inout */ in nsICommandParams aCommandParams);
    
  /*
   * Execute the specified command.
   * The command will be executed in aTargetWindow if it is specified.
   * If aTargetWindow is null, it will go to the focused window.
   *
   * param: aCommandParams, a list of name-value pairs of command parameters,
   * may be null for parameter-less commands.
   *
   */
  void        doCommand(in string aCommandName,
                        in nsICommandParams aCommandParams,
                        in nsIDOMWindow aTargetWindow);

};


/*

Arguments to observers "Observe" method are as follows:

  void Observe(   in nsISupports aSubject,          // The nsICommandManager calling this Observer
                  in string      aTopic,            // Name of the command
                  in wstring     aDummy );          // unused

*/

// {64edb481-0c04-11d5-a73c-e964b968b0bc}
%{C++
#define NS_COMMAND_MANAGER_CID \
{ 0x64edb481, 0x0c04, 0x11d5, { 0xa7, 0x3c, 0xe9, 0x64, 0xb9, 0x68, 0xb0, 0xbc } }

#define NS_COMMAND_MANAGER_CONTRACTID \
 "@mozilla.org/embedcomp/command-manager;1"
%}