// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:ui/ui.dart' show TextDirection;

export 'package:ui/ui.dart'
    show
        BlendMode,
        Color,
        FontStyle,
        FontWeight,
        Radius,
        TextAlign,
        TextBaseline,
        TextDirection;

/// The two cardinal directions in two dimensions.
///
/// The axis is always relative to the current coordinate space. This means, for
/// example, that a [horizontal] axis might actually be diagonally from top
/// right to bottom left, due to some local [Transform] applied to the scene.
///
/// See also:
///
///  * [AxisDirection], which is a directional version of this enum (with values
///    light left and right, rather than just horizontal).
///  * [TextDirection], which disambiguates between left-to-right horizontal
///    content and right-to-left horizontal content.
enum Axis {
  /// Left and right.
  ///
  /// See also:
  ///
  ///  * [TextDirection], which disambiguates between left-to-right horizontal
  ///    content and right-to-left horizontal content.
  horizontal,

  /// Up and down.
  vertical,
}

/// A direction along either the horizontal or vertical [Axis].
enum AxisDirection {
  /// Zero is at the bottom and positive values are above it: ⇈
  ///
  /// Alphabetical content with a [GrowthDirection.forward] would have the A at
  /// the bottom and the Z at the top. This is an unusual configuration.
  up,

  /// Zero is on the left and positive values are to the right of it: ⇉
  ///
  /// Alphabetical content with a [GrowthDirection.forward] would have the A on
  /// the left and the Z on the right. This is the ordinary reading order for a
  /// horizontal set of tabs in an English application, for example.
  right,

  /// Zero is at the top and positive values are below it: ⇊
  ///
  /// Alphabetical content with a [GrowthDirection.forward] would have the A at
  /// the top and the Z at the bottom. This is the ordinary reading order for a
  /// vertical list.
  down,

  /// Zero is to the right and positive values are to the left of it: ⇇
  ///
  /// Alphabetical content with a [GrowthDirection.forward] would have the A at
  /// the right and the Z at the left. This is the ordinary reading order for a
  /// horizontal set of tabs in a Hebrew application, for example.
  left,
}

/// A direction in which boxes flow vertically.
///
/// This is used by the flex algorithm (e.g. [Column]) to decide in which
/// direction to draw boxes.
///
/// This is also used to disambiguate `start` and `end` values (e.g.
/// [MainAxisAlignment.start] or [CrossAxisAlignment.end]).
///
/// See also:
///
///  * [TextDirection], which controls the same thing but horizontally.
enum VerticalDirection {
  /// Boxes should start at the bottom and be stacked vertically towards the top.
  ///
  /// The "start" is at the bottom, the "end" is at the top.
  up,

  /// Boxes should start at the top and be stacked vertically towards the bottom.
  ///
  /// The "start" is at the top, the "end" is at the bottom.
  down,
}