Ghost/core/client/assets/sass/helpers/mixins.scss

//
// Styles
// --------------------------------------------------

@mixin baseline {
    margin: 1.6em 0;
}

@mixin clearfix {
  &:after {
    content:"";
    display:table;
    clear:both;
  }
}

// User select
// For selecting text on the page

@mixin user-select($select) {
  -webkit-user-select: $select;
     -moz-user-select: $select;
      -ms-user-select: $select; // IE10+
          user-select: $select;
}

// WebKit-style focus

@mixin tab-focus() {
  // Default
  outline: thin dotted;
  // WebKit
  outline: 0px auto -webkit-focus-ring-color;
  outline-offset: -2px;
}


@mixin form-control-focus($color: #66afe9) {
  $color-rgba: rgba(red($color), green($color), blue($color), .6);
  &:focus {
    border-color: $color;
    outline: 0;
    box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 8px $color-rgba;
  }
}

@mixin input-size($parent, $input-height, $padding-vertical, $padding-horizontal, $font-size, $line-height, $border-radius) {
  #{$parent} {
    height: $input-height;
    padding: $padding-vertical $padding-horizontal;
    font-size: $font-size;
    line-height: $line-height;
    border-radius: $border-radius;
  }

  select#{$parent} {
    height: $input-height;
    line-height: $input-height;
  }

  textarea#{$parent},
  select[multiple]#{$parent} {
    height: auto;
  }
}

@mixin form-control-validation($text-color: #555, $border-color: #ccc, $background-color: #f5f5f5) {
  // Color the label and help text
  .help-block,
  .control-label,
  .radio,
  .checkbox,
  .radio-inline,
  .checkbox-inline  {
    color: $text-color;
  }
  // Set the border and box shadow on specific inputs to match
  .form-control {
    border-color: $border-color;
    box-shadow: inset 0 1px 1px rgba(0,0,0,.075); // Redeclare so transitions work
    &:focus {
      border-color: darken($border-color, 10%);
      box-shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten($border-color, 20%);
    }
  }
  // Set validation states also for addons
  .input-group-addon {
    color: $text-color;
    border-color: $border-color;
    background-color: $background-color;
  }
  // Optional feedback icon
  .form-control-feedback {
    color: $text-color;
  }
}

@mixin make-row($gutter: 30px) {
  margin-left:  ($gutter / -2);
  margin-right: ($gutter / -2);
  @include clearfix();
}

//==== Simple SCSS mixin to create CSS triangles
//==== Example: @include css-triangle (10px, #fff, "up");
@mixin triangle ($size: 20px, $color: #000, $direction: "down") {
    $size: $size / 2;
    width: 0;
    height: 0;

    @if $direction == "down" {
        border-left: $size solid #{setTriangleColor($direction, "left", $color)};
        border-right: $size solid #{setTriangleColor($direction, "right", $color)};
        border-top: $size solid #{setTriangleColor($direction, "top", $color)};
    }

    @if $direction == "up" {
        border-left: $size solid #{setTriangleColor($direction, "left", $color)};
        border-right: $size solid #{setTriangleColor($direction, "right", $color)};
        border-bottom: $size solid #{setTriangleColor($direction, "bottom", $color)};
    }

    @if $direction == "left" {
        border-right: $size solid #{setTriangleColor($direction, "right", $color)};
        border-top: $size solid #{setTriangleColor($direction, "top", $color)};
        border-bottom: $size solid #{setTriangleColor($direction, "bottom", $color)};
    }

    @if $direction == "right" {
        border-left: $size solid #{setTriangleColor($direction, "left", $color)};
        border-bottom: $size solid #{setTriangleColor($direction, "bottom", $color)};
        border-top: $size solid #{setTriangleColor($direction, "top", $color)};
    }

}

//Utility function to return the relevant colour depending on what type of arrow it is
@function setTriangleColor($direction, $side, $color) {

    @if $direction == "left" and $side == "right"
    or  $direction == "right" and $side == "left"
    or $direction == "down" and $side == "top"
    or $direction == "up" and $side == "bottom" {
        @return $color
    } @else {
        @return "transparent";
    }

}