/* -*- Mode: C++; 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"
#include "nsIObserver.idl"
#include "nsICommandParams.idl"

interface mozIDOMWindowProxy;

/*
 * 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(bb5a1730-d83b-4fa2-831b-35b9d5842e84)]
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 mozIDOMWindowProxy 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 mozIDOMWindowProxy 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 mozIDOMWindowProxy 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 mozIDOMWindowProxy 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"
%}