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 *   Rob Arnold <tellrob@gmail.com>
 *   Siddharth Agarwal <sid.bugzilla@gmail.com>
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#include "nsISupports.idl"
#include "nsIBaseWindow.idl"

interface nsIDocShell;
interface nsITaskbarTabPreview;
interface nsITaskbarWindowPreview;
interface nsITaskbarPreviewController;
interface nsITaskbarProgress;

/*
 * 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
 */
[scriptable, uuid(0a3abac7-35b7-4b50-8381-7dbc3c55b061)]
interface nsIWinTaskbar : nsISupports
{
  /**
   * Returns true if the taskbar service is available. This value does not
   * change during runtime.
   */
  readonly attribute boolean available;

  /**
   * Creates a taskbar preview. The docshell 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);

  /**
   * 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);
};