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/* vim: se cin sw=2 ts=2 et : */
/* -*- 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 nsIDocShell;
interface nsITaskbarPreview;
interface nsITaskbarPreviewButton;

/**
 * nsITaskbarPreviewCallback
 *
 * Provides an interface for async image result callbacks. See
 * nsITaskbarPreviewController request apis below.
 */
[scriptable, function, uuid(f3744696-320d-4804-9c27-6a84c29acaa6)]
interface nsITaskbarPreviewCallback : nsISupports
{
  void done(in nsISupports aCanvas, in boolean aDrawBorder);
};

/**
 * nsITaskbarPreviewController
 *
 * nsITaskbarPreviewController provides the behavior for the taskbar previews.
 * Its methods and properties are used by nsITaskbarPreview. Clients are
 * intended to provide their own implementation of this interface. Depending on
 * the interface the controller is attached to, only certain methods/attributes
 * are required to be implemented.
 */
[scriptable, uuid(8b427646-e446-4941-ae0b-c1122a173a68)]
interface nsITaskbarPreviewController : nsISupports
{
  /**
   * The width of the preview image. This value is allowed to change at any
   * time. See requestPreview for more information.
   */
  readonly attribute unsigned long width;

  /**
   * The height of the preview image. This value is allowed to change at any
   * time.  See requestPreview for more information.
   */
  readonly attribute unsigned long height;

  /**
   * The aspect ratio of the thumbnail - this does not need to match the ratio
   * of the preview. This value is allowed to change at any time. See
   * requestThumbnail for more information.
   */
  readonly attribute float thumbnailAspectRatio;

  /**
   * Invoked by nsITaskbarPreview when it needs to render the preview.
   *
   * @param aCallback Async callback the controller should invoke once
   * the thumbnail is rendered. aCallback receives as its only parameter
   * a canvas containing the preview image.
   */
  void requestPreview(in nsITaskbarPreviewCallback aCallback);

  /**
   * Note: it is guaranteed that width/height == thumbnailAspectRatio
   * (modulo rounding errors)
   *
   * Also note that the context is not attached to a canvas element.
   *
   * @param aCallback Async callback the controller should invoke once
   * the thumbnail is rendered. aCallback receives as its only parameter
   * a canvas containing the thumbnail image. Canvas dimensions should
   * match the requested width or height otherwise setting the thumbnail
   * will fail.
   * @param width The width of the requested thumbnail
   * @param height The height of the requested thumbnail
   */
  void requestThumbnail(in nsITaskbarPreviewCallback aCallback,
                        in unsigned long width, in unsigned long height);

  /**
   * Invoked when the user presses the close button on the tab preview.
   */
  void onClose();

  /**
   * Invoked when the user clicks on the tab preview.
   *
   * @return true if the top level window corresponding to the preview should
   *         be activated, false if activation is not accepted.
   */
  boolean onActivate();

  /**
   * Invoked when one of the buttons on the window preview's toolbar is pressed.
   *
   * @param button The button that was pressed. This can be compared with the
   *               buttons returned by nsITaskbarWindowPreview.getButton.
   */
  void onClick(in nsITaskbarPreviewButton button);
};