/*
 * Backpack - Skyscanner's Design System
 *
 * Copyright 2016 Skyscanner Ltd
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

@import '../bonds.scss';

////
/// @group scroll-indicator
////

/// Scroll indicator utility.
///
/// @access private

@mixin _bpk-scroll-indicator($gradient-color, $direction: 'left') {
  $gradient-direction: if($direction == 'left', 90deg, 270deg);

  position: absolute;
  top: 0;
  bottom: 0;
  content: ' ';
  display: block;
  z-index: 1;
  width: $bpk-spacing-xl;
  background-image: linear-gradient(
    $gradient-direction,
    rgba($gradient-color, 1),
    rgba($gradient-color, 0)
  );
  pointer-events: none;

  @if $direction == 'left' {
    left: 0;
  } @else {
    right: 0;
  }
}

/// Left-sided scroll indicator.
///
/// @example scss
///   .selector {
///     @include bpk-scroll-indicator-left($bpk-color-grey-100);
///   }

@mixin bpk-scroll-indicator-left($gradient-color) {
  &::before {
    @include _bpk-scroll-indicator($gradient-color, 'left');
  }
}

/// Right-sided scroll indicator.
///
/// @example scss
///   .selector {
///     @include bpk-scroll-indicator-right($bpk-color-grey-100);
///   }

@mixin bpk-scroll-indicator-right($gradient-color) {
  &::after {
    @include _bpk-scroll-indicator($gradient-color, 'right');
  }
}