_mixins.scss

// Mixins for:
// • Iterating classes
// • Flexbox, including browser prefixes
// • Gradients, including browser prefixes

// Created by Carl Fairclough
// carlfairclough.me

@mixin iterate-classes($name, $property, $values, $unit: null) {

  @each $value in $values {

    $val: $value / 10;

    .#{$name}-#{$val * 10} { #{$property}:$value + $unit; }
  }
}

@mixin flexbox {
  display: -webkit-box;
  display: -webkit-flex;
  display: -moz-flex;
  display: -ms-flexbox;
  display: flex;
}
%flexbox { @include flexbox; }

@mixin inline-flex {
  display: -webkit-inline-box;
  display: -webkit-inline-flex;
  display: -moz-inline-flex;
  display: -ms-inline-flexbox;
  display: inline-flex;
}
%inline-flex { @include inline-flex; }

// Flexbox Direction
// Values: row | row-reverse | column | column-reverse
// Default: row

@mixin flex-direction($value: row) {
  @if $value == row-reverse {
    -webkit-box-direction: reverse;
    -webkit-box-orient: horizontal;
  } @else if $value == column {
    -webkit-box-direction: normal;
    -webkit-box-orient: vertical;
  } @else if $value == column-reverse {
    -webkit-box-direction: reverse;
    -webkit-box-orient: vertical;
  } @else {
    -webkit-box-direction: normal;
    -webkit-box-orient: horizontal;
  }
  -webkit-flex-direction: $value;
  -moz-flex-direction: $value;
  -ms-flex-direction: $value;
  flex-direction: $value;
}
  // Shorter version:
  @mixin flex-dir($args...) { @include flex-direction($args...); }


// Flexbox Wrap
// Values: nowrap | wrap | wrap-reverse
// Default: nowrap

@mixin flex-wrap($value: nowrap) {
  // No Webkit Box fallback.
  -webkit-flex-wrap: $value;
  -moz-flex-wrap: $value;
  @if $value == nowrap {
    -ms-flex-wrap: none;
  } @else {
    -ms-flex-wrap: $value;
  }
  flex-wrap: $value;
}


// Flexbox Flow (shorthand)
// Values: <flex-direction> | <flex-wrap>
// Default: row nowrap

@mixin flex-flow($values: (row nowrap)) {
  // No Webkit Box fallback.
  -webkit-flex-flow: $values;
  -moz-flex-flow: $values;
  -ms-flex-flow: $values;
  flex-flow: $values;
}


// Flexbox Order
// Default: 0
@mixin order($int: 0) {
  -webkit-box-ordinal-group: $int + 1;
  -webkit-order: $int;
  -moz-order: $int;
  -ms-flex-order: $int;
  order: $int;
}


// Flexbox Grow
// Default: 0
@mixin flex-grow($int: 0) {
  -webkit-box-flex: $int;
  -webkit-flex-grow: $int;
  -moz-flex-grow: $int;
  -ms-flex-positive: $int;
  flex-grow: $int;
}


// Flexbox Shrink
// Default: 1
@mixin flex-shrink($int: 1) {
  -webkit-flex-shrink: $int;
  -moz-flex-shrink: $int;
  -ms-flex-negative: $int;
  flex-shrink: $int;
}


// Flexbox Basis
// Values: Like "width"
// Default: auto
@mixin flex-basis($value: auto) {
  -webkit-flex-basis: $value;
  -moz-flex-basis: $value;
  -ms-flex-preferred-size: $value;
  flex-basis: $value;
}


// Flexbox "Flex" (shorthand)
// Values: none | <flex-grow> <flex-shrink> || <flex-basis>
// Default: See individual properties (1 1 0).
@mixin flex($fg: 1, $fs: null, $fb: null) {

  // Set a variable to be used by box-flex properties
  $fg-boxflex: $fg;

  // Box-Flex only supports a flex-grow value so let's grab the
  // first item in the list and just return that.
  @if type-of($fg) == 'list' {
    $fg-boxflex: nth($fg, 1);
  }

  -webkit-box-flex: $fg-boxflex;
  -webkit-flex: $fg $fs $fb;
  -moz-box-flex: $fg-boxflex;
  -moz-flex: $fg $fs $fb;
  -ms-flex: $fg $fs $fb;
  flex: $fg $fs $fb;
}


// Flexbox Justify Content
// Values: flex-start | flex-end | center | space-between | space-around
// Default: flex-start
@mixin justify-content($value: flex-start) {
  @if $value == flex-start {
    -webkit-box-pack: start;
    -ms-flex-pack: start;
  } @else if $value == flex-end {
    -webkit-box-pack: end;
    -ms-flex-pack: end;
  } @else if $value == space-between {
    -webkit-box-pack: justify;
    -ms-flex-pack: justify;
  } @else if $value == space-around {
    -ms-flex-pack: distribute;
  } @else {
    -webkit-box-pack: $value;
    -ms-flex-pack: $value;
  }
  -webkit-justify-content: $value;
  -moz-justify-content: $value;
  justify-content: $value;
}
  // Shorter version:
  @mixin flex-just($args...) { @include justify-content($args...); }


// Flexbox Align Items
// Values: flex-start | flex-end | center | baseline | stretch
// Default: stretch
@mixin align-items($value: stretch) {
  @if $value == flex-start {
    -webkit-box-align: start;
    -ms-flex-align: start;
  } @else if $value == flex-end {
    -webkit-box-align: end;
    -ms-flex-align: end;
  } @else {
    -webkit-box-align: $value;
    -ms-flex-align: $value;
  }
  -webkit-align-items: $value;
  -moz-align-items: $value;
  align-items: $value;
}


// Flexbox Align Self
// Values: auto | flex-start | flex-end | center | baseline | stretch
// Default: auto
@mixin align-self($value: auto) {
  // No Webkit Box Fallback.
  -webkit-align-self: $value;
  -moz-align-self: $value;
  @if $value == flex-start {
    -ms-flex-item-align: start;
  } @else if $value == flex-end {
    -ms-flex-item-align: end;
  } @else {
    -ms-flex-item-align: $value;
  }
  align-self: $value;
}

// Flexbox Align Content
// Values: flex-start | flex-end | center | space-between | space-around | stretch
// Default: stretch
@mixin align-content($value: stretch) {
  // No Webkit Box Fallback.
  -webkit-align-content: $value;
  -moz-align-content: $value;
  @if $value == flex-start {
    -ms-flex-line-pack: start;
  } @else if $value == flex-end {
    -ms-flex-line-pack: end;
  } @else {
    -ms-flex-line-pack: $value;
  }
  align-content: $value;
}


// GRADIENTS
@mixin linear-gradient($direction, $color-stops...) {
  // Direction has been omitted and happens to be a color-stop
  @if is-direction($direction) == false {
    $color-stops: $direction, $color-stops;
    $direction: 180deg;
  }

  background: nth(nth($color-stops, 1), 1);
  background: -webkit-linear-gradient(legacy-direction($direction), $color-stops);
  background: linear-gradient($direction, $color-stops);
}