/* -*- 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"

interface nsIArray;
interface nsIMutableArray;

[scriptable, uuid(1FE6A9CD-2B18-4dd5-A176-C2B32FA4F683)]
interface nsIJumpListBuilder : nsISupports
{
  /**
   * JumpLists
   *
   * Jump lists are built and then applied. Modifying an applied jump list is not
   * permitted. Callers should begin the creation of a new jump list using
   * initListBuild, add sub lists using addListToBuild, then commit the jump list
   * using commitListBuild. Lists are built in real-time during the sequence of
   * build calls, make sure to check for errors on each individual step.
   *
   * The default number of allowed items in a jump list is ten. Users can change
   * the number through system preferences. User may also pin items to jump lists,
   * which take up additional slots. Applications do not have control over the
   * number of items allowed in jump lists; excess items added are dropped by the
   * system. Item insertion priority is defined as first to last added. 
   *
   * Users may remove items from jump lists after they are commited. The system
   * tracks removed items between commits. A list of these items is returned by
   * a call to initListBuild. nsIJumpListBuilder does not filter entries added that
   * have been removed since the last commit. To prevent repeatedly adding entries
   * users have removed, applications are encoraged to track removed items 
   * internally.
   *
   * Each list is made up of an array of nsIJumpListItem representing items
   * such as shortcuts, links, and separators. See nsIJumpListItem for information
   * on adding additional jump list types.
   */

  /**
   * List Types
   */

  /**
   * Task List
   * 
   * Tasks are common actions performed by users within the application. A task
   * can be represented by an application shortcut and associated command line
   * parameters or a URI. Task lists should generally be static lists that do not
   * change often, if at all - similar to an application menu.
   *
   * Tasks are given the highest priority of all lists when space is limited.
   */
  const short JUMPLIST_CATEGORY_TASKS = 0;

  /**
   * Recent or Frequent list
   * 
   * Recent and frequent lists are based on Window's recent document lists. The
   * lists are generated automatically by Windows. Applications that use recent
   * or frequent lists should keep document use tracking up to date by calling
   * the SHAddToRecentDocs shell api.
   */
  const short JUMPLIST_CATEGORY_RECENT       = 1;
  const short JUMPLIST_CATEGORY_FREQUENT     = 2;

  /**
   * Custom Lists
   *
   * Custom lists can be made up of tasks, links, and separators. The title of
   * of the list is passed through the optional string parameter of addBuildList.
   */
  const short JUMPLIST_CATEGORY_CUSTOMLIST   = 3;

  /**
   * Indicates whether jump list taskbar features are supported by the current
   * host.
   */
  readonly attribute short available;

  /**
   * JumpList management
   *
   * @throw NS_ERROR_NOT_AVAILABLE on all calls if taskbar functionality
   * is not supported by the operating system.
   */

  /**
   * Indicates if a commit has already occurred in this session.
   */
  readonly attribute boolean isListCommitted;

  /**
   * The maximum number of jump list items the current desktop can support.
   */
  readonly attribute short maxListItems;

  /**
   * Initializes a jump list build and returns a list of items the user removed
   * since the last time a jump list was committed. Removed items can become state
   * after initListBuild is called, lists should be built in single-shot fasion.
   *
   * @param removedItems
   *        A list of items that were removed by the user since the last commit.
   *
   * @returns true if the operation completed successfully.
   */
  boolean initListBuild(in nsIMutableArray removedItems);
  
  /**
   * Adds a list and if required, a set of items for the list.
   *
   * @param aCatType
   *        The type of list to add.
   * @param items
   *        An array of nsIJumpListItem items to add to the list.
   * @param catName
   *        For custom lists, the title of the list.
   *
   * @returns true if the operation completed successfully.
   *
   * @throw NS_ERROR_INVALID_ARG if incorrect parameters are passed for
   * a particular category or item type.
   * @throw NS_ERROR_ILLEGAL_VALUE if an item is added that was removed
   * since the last commit.
   * @throw NS_ERROR_UNEXPECTED on internal errors.
   */
  boolean addListToBuild(in short aCatType, [optional] in nsIArray items, [optional] in AString catName);

  /**
   * Aborts and clears the current jump list build.
   */
  void abortListBuild();

  /**
   * Commits the current jump list build to the Taskbar.
   *
   * @returns true if the operation completed successfully.
   */
  boolean commitListBuild();

  /**
   * Deletes any currently applied taskbar jump list for this application.
   * Common uses would be the enabling of a privacy mode and uninstallation.
   *
   * @returns true if the operation completed successfully.
   *
   * @throw NS_ERROR_UNEXPECTED on internal errors.
   */
  boolean deleteActiveList();
};
