CSS Flexbox - Sass Mixins

flexbox.scss

// --------------------------------------------------
// Flexbox SASS mixins
// The spec: http://www.w3.org/TR/css3-flexbox
// --------------------------------------------------

// Flexbox display
@mixin flexbox {
  display: -webkit-box;
  display: -moz-box;
  display: -ms-flexbox;
  display: -webkit-flex;
  display: flex;
}

// Inline flex display
@mixin inline-flex {
  display: -webkit-inline-box;
  display: -moz-inline-box;
  display: -webkit-inline-flex;
  display: -ms-inline-flexbox;
  display: inline-flex;
}

// The 'flex' shorthand
// - applies to: flex items
// <positive-number>, initial, auto, or none
@mixin flex($fg: 1, $fs: 0, $fb: auto) {

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

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

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

// Flex Flow Direction
// - applies to: flex containers
// row (default) | row-reverse | column | column-reverse
@mixin flex-direction($direction: row) {
  @if $direction == row-reverse {
    -webkit-box-direction: reverse;
    -webkit-box-orient: horizontal;
       -moz-box-direction: reverse;
       -moz-box-orient: horizontal;
  } @else if $direction == column {
    -webkit-box-direction: normal;
     -webkit-box-orient: vertical;
       -moz-box-direction: normal;
        -moz-box-orient: vertical;
  } @else if $direction == column-reverse {
    -webkit-box-direction: reverse;
      -webkit-box-orient: vertical;
       -moz-box-direction: reverse;
         -moz-box-orient: vertical;
  } @else {
     -webkit-box-direction: normal;
    -webkit-box-orient: horizontal;
        -moz-box-direction: normal;
       -moz-box-orient: horizontal;
  }
  -webkit-flex-direction: $direction;
      -ms-flex-direction: $direction;
          flex-direction: $direction;
}

// Flex Line Wrapping
// - applies to: flex containers
// nowrap | wrap | wrap-reverse
@mixin flex-wrap($value: nowrap) {
  // No Webkit/FF Box fallback.
  -webkit-flex-wrap: $value;
  @if $value == nowrap {
    -ms-flex-wrap: none;
  } @else {
    -ms-flex-wrap: $value;
  }
  flex-wrap: $value;
}

// Flex Direction and Wrap
// - applies to: flex containers
// <flex-direction> || <flex-wrap>
@mixin flex-flow($values: (row nowrap)) {
  // No Webkit/FF Box fallback.
  -webkit-flex-flow: $values;
      -ms-flex-flow: $values;
          flex-flow: $values;
}

// Display Order
// - applies to: flex items
// <integer>
@mixin order($int: 0) {
  -webkit-box-ordinal-group: $int + 1;
     -moz-box-ordinal-group: $int + 1;
              -webkit-order: $int;
             -ms-flex-order: $int;
                      order: $int;
}

// Flex grow factor
// - applies to: flex items
// <number>
@mixin flex-grow($int: 1) {
   -webkit-box-flex: $int;
      -moz-box-flex: $int;
  -webkit-flex-grow: $int;
           -ms-flex: $int;
          flex-grow: $int;
}

// Flex shrink
// - applies to: flex item shrink factor
// <number> 
@mixin flex-shrink($int: 0) {
  -webkit-flex-shrink: $int;
     -moz-flex-shrink: $int;
             -ms-flex: $int;
          flex-shrink: $int;
}

// Flex basis
// - the initial main size of the flex item
// - applies to: flex itemsnitial main size of the flex item
// <width> 
@mixin flex-basis($value: auto) {
  -webkit-flex-basis: $value;
          flex-basis: $value;
}

// Axis Alignment
// - applies to: flex containers
// flex-start | flex-end | center | space-between | space-around 
@mixin justify-content($value: flex-start) {
  @if $value == flex-start {
    -webkit-box-pack: start;
       -moz-box-pack: start;
       -ms-flex-pack: start;
  } @else if $value == flex-end {
    -webkit-box-pack: end;
       -moz-box-pack: end;
       -ms-flex-pack: end;
  } @else if $value == space-between {
    -webkit-box-pack: justify;
       -moz-box-pack: justify;
       -ms-flex-pack: justify;
  } @else if $value == space-around {
       -ms-flex-pack: distribute;
  } @else {
    -webkit-box-pack: $value;
       -moz-box-pack: $value;
       -ms-flex-pack: $value;
  }
  -webkit-justify-content: $value;
          justify-content: $value;
}

// Packing Flex Lines
// - applies to: multi-line flex containers
// flex-start | flex-end | center | space-between | space-around | stretch 
@mixin align-content($value: stretch) {
  // No Webkit Box Fallback.
  -webkit-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;
}

// Cross-axis Alignment
// - applies to: flex containers
// flex-start | flex-end | center | baseline | stretch 
@mixin align-items($value: stretch) {
  @if $value == flex-start {
    -webkit-box-align: start;
       -moz-box-align: start;
       -ms-flex-align: start;
  } @else if $value == flex-end {
    -webkit-box-align: end;
       -moz-box-align: end;
       -ms-flex-align: end;
  } @else {
    -webkit-box-align: $value;
       -moz-box-align: $value;
       -ms-flex-align: $value;
  }
  -webkit-align-items: $value;
          align-items: $value;
}

// Cross-axis Alignment
// - applies to: flex items
// auto | flex-start | flex-end | center | baseline | stretch 
@mixin align-self($value: auto) {
  // No Webkit Box Fallback.
  -webkit-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;
}

Thank you. It is awesome!

Unfortunately the mixins have to be more complex, e.g. for flex-direction:

@mixin flex-direction($value: row) {
    @if $value == row-reverse {
    -webkit-box-direction: reverse;
    -webkit-box-orient: horizontal;
    -moz-box-direction: reverse;
    -moz-box-orient: horizontal;
  } @else if $value == column {
    -webkit-box-direction: normal;
    -webkit-box-orient: vertical;
    -moz-box-direction: normal;
    -moz-box-orient: vertical;
  } @else if $value == column-reverse {
    -webkit-box-direction: reverse;
    -webkit-box-orient: vertical;
    -moz-box-direction: reverse;
    -moz-box-orient: vertical;
  } @else {
    -webkit-box-direction: normal;
    -webkit-box-orient: horizontal;
    -moz-box-direction: normal;
    -moz-box-orient: horizontal;
  }
  -webkit-flex-direction: $value;
  -ms-flex-direction: $value;
  flex-direction: $value;
}

Please take a look at the more complete mixins from the Mozilla web docs:
Cross-browser Flexbox mixins

@ltlBeBoy thanks for bringing to my attention. I've updated with the more complete versions of the mixins.

Thank you. It is awesome!

@galhan You're welcome!

Thank you very much for this man !

@alexpatego My pleasure!

thanks a lot

@ajoy45 You're welcome!