/* -*- Mode: IDL; 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/.
 */

/**
 * These objects support visualization of flex containers by the
 * dev tools.
 */

/**
 * A flex container's main and cross axes are either horizontal or
 * vertical, each with two possible directions.
 */
enum FlexPhysicalDirection {
  "horizontal-lr",
  "horizontal-rl",
  "vertical-tb",
  "vertical-bt",
};

[ChromeOnly]
interface Flex
{
  sequence<FlexLineValues> getLines();

  /**
   * The physical direction in which successive flex items are placed,
   * within a flex line in this flex container.
   */
  readonly attribute FlexPhysicalDirection mainAxisDirection;

  /**
   * The physical direction in which successive flex lines are placed
   * in this flex container (if it is or were multi-line).
   */
  readonly attribute FlexPhysicalDirection crossAxisDirection;
};

/**
 * Lines with items that have been shrunk are shrinking; with items
 * that have grown are growing, and all others are unchanged.
 */
enum FlexLineGrowthState { "unchanged", "shrinking", "growing" };

[ChromeOnly]
interface FlexLineValues
{
  readonly attribute FlexLineGrowthState growthState;
  readonly attribute double crossStart;
  readonly attribute double crossSize;

  // firstBaselineOffset measures from flex-start edge.
  readonly attribute double firstBaselineOffset;

  // lastBaselineOffset measures from flex-end edge.
  readonly attribute double lastBaselineOffset;

  /**
   * getItems() returns FlexItemValues only for the Elements in
   * this Flex container -- ignoring struts and abs-pos Elements.
   */
  sequence<FlexItemValues> getItems();
};

[ChromeOnly]
interface FlexItemValues
{
  readonly attribute Node? node;
  readonly attribute double mainBaseSize;
  readonly attribute double mainDeltaSize;
  readonly attribute double mainMinSize;
  readonly attribute double mainMaxSize;
  readonly attribute double crossMinSize;
  readonly attribute double crossMaxSize;
};