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 * 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
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 * License.
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 * The Original Code is mozilla.org code.
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 * The Initial Developer of the Original Code is
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 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Rob Arnold <tellrob@gmail.com>
 *   Siddharth Agarwal <sid.bugzilla@gmail.com>
 *   Jim Mathies <jmathies@mozilla.com>
 *
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#include "nsISupports.idl"
#include "nsIBaseWindow.idl"

interface nsIDocShell;
interface nsITaskbarTabPreview;
interface nsITaskbarWindowPreview;
interface nsITaskbarPreviewController;
interface nsITaskbarProgress;
interface nsIJumpListBuilder;
interface nsIDOMWindow;

/*
 * nsIWinTaskbar
 *
 * This interface represents a service which exposes the APIs provided by the
 * Windows taskbar to applications.
 *
 * Starting in Windows 7, applications gain some control over their appearance
 * in the taskbar. By default, there is one taskbar preview per top level
 * window (excluding popups). This preview is represented by an
 * nsITaskbarWindowPreview object.
 *
 * An application can register its own "tab" previews. Such previews will hide
 * the corresponding nsITaskbarWindowPreview automatically (though this is not
 * reflected in the visible attribute of the nsITaskbarWindowPreview). These
 * tab previews do not have to correspond to tabs in the application - they can
 * vary in size, shape and location. They do not even need to be actual GUI
 * elements on the window. Unlike window previews, tab previews require most of
 * the functionality of the nsITaskbarPreviewController to be implemented.
 *
 * Applications can also show progress on their taskbar icon. This does not
 * interact with the taskbar previews except if the nsITaskbarWindowPreview is
 * made invisible in which case the progress is naturally not shown on that
 * window.
 *
 * When taskbar icons are combined as is the default in Windows 7, the progress
 * for those windows is also combined as defined here:
 * http://msdn.microsoft.com/en-us/library/dd391697%28VS.85%29.aspx
 *
 * Applications may also define custom taskbar jump lists on application shortcuts.
 * See nsIJumpListBuilder for more information.
 */

[scriptable, uuid(a25ad3ed-1ded-4473-bb6e-bf8b89d88949)]
interface nsIWinTaskbar : nsISupports
{
  /**
   * Returns true if the operating system supports Win7+ taskbar features.
   * This property acts as a replacement for in-place os version checking.
   */
  readonly attribute boolean available;

  /**
   * Returns the default application user model identity the application
   * registers with the system. This id is used by the taskbar in grouping
   * windows and in associating pinned shortcuts with running instances and
   * jump lists.
   */
  readonly attribute AString defaultGroupId;

  /**
   * Taskbar window and tab preview management
   */

  /**
   * Creates a taskbar preview. The docshell should be a toplevel docshell and
   * is used to find the toplevel window. See the documentation for
   * nsITaskbarTabPreview for more information.
   */
  nsITaskbarTabPreview createTaskbarTabPreview(in nsIDocShell shell,
                                               in nsITaskbarPreviewController controller);

  /**
   * Gets the taskbar preview for a window. The docshell is used to find the
   * toplevel window. See the documentation for nsITaskbarTabPreview for more
   * information.
   *
   * Note: to implement custom drawing or buttons, a controller is required.
   */
  nsITaskbarWindowPreview getTaskbarWindowPreview(in nsIDocShell shell);

  /**
   * Taskbar icon progress indicator
   */

  /**
   * Gets the taskbar progress for a window. The docshell is used to find the
   * toplevel window. See the documentation for nsITaskbarProgress for more
   * information.
   */
  nsITaskbarProgress getTaskbarProgress(in nsIDocShell shell);

  /**
   * Taskbar and start menu jump list management
   */

  /**
   * Retrieve a taskbar jump list builder
   *
   * Fails if a jump list build operation has already been initiated, developers
   * should make use of a single instance of nsIJumpListBuilder for building lists
   * within an application.
   *
   * @thow NS_ERROR_ALREADY_INITIALIZED if an nsIJumpListBuilder instance is
   * currently building a list.
   */
  nsIJumpListBuilder createJumpListBuilder();

  /**
   * Application window taskbar group settings
   */

  /**
   * Set the grouping id for a window.
   *
   * The runtime sets a default, global grouping id for all windows on startup.
   * setGroupIdForWindow allows individual windows to be grouped independently
   * on the taskbar. Ids should be unique to the app and window to insure
   * conflicts with other pinned applications do no arise.
   *
   * The default group id is based on application.ini vendor, application, and
   * version values, with a format of 'vendor.app.version'. The default can be
   * retrieved via defaultGroupId.
   *
   * Note, when a window changes taskbar window stacks, it is placed at the
   * bottom of the new stack.
   *
   * @thow NS_ERROR_INVALID_ARG if the window is not a valid top level window
   * associated with a widget.
   * @thow NS_ERROR_FAILURE if the property on the window could not be set.
   * @thow NS_ERROR_UNEXPECTED for general failures.
   */
  void setGroupIdForWindow(in nsIDOMWindow aParent, in AString aIdentifier);
};
