Bootstrap/lib/mixins.less

/* Mixins.less
 * Snippets of reusable CSS to develop faster and keep code readable
 * ----------------------------------------------------------------- */


// Clearfix for clearing floats like a boss h5bp.com/q
.clearfix() {
  zoom: 1;
  &:before,
  &:after {
    display: table;
    content: "";
    zoom: 1;
  }
  &:after {
    clear: both;
  }
}

// Center-align a block level element
.center-block() {
  display: block;
  margin-left: auto;
  margin-right: auto;
}

// Sizing shortcuts
.size(@height: 5px, @width: 5px) {
  height: @height;
  width: @width;
}
.square(@size: 5px) {
  .size(@size, @size);
}

// Input placeholder text
.placeholder(@color: @grayLight) {
  :-moz-placeholder {
    color: @color;
  }
  ::-webkit-input-placeholder {
    color: @color;
  }
}

// Font Stacks
#font {
  .shorthand(@weight: normal, @size: 14px, @lineHeight: 20px) {
    font-size: @size;
    font-weight: @weight;
    line-height: @lineHeight;
  }
  .sans-serif(@weight: normal, @size: 14px, @lineHeight: 20px) {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: @size;
    font-weight: @weight;
    line-height: @lineHeight;
  }
  .serif(@weight: normal, @size: 14px, @lineHeight: 20px) {
    font-family: "Georgia", Times New Roman, Times, serif;
    font-size: @size;
    font-weight: @weight;
    line-height: @lineHeight;
  }
  .monospace(@weight: normal, @size: 12px, @lineHeight: 20px) {
    font-family: "Monaco", Courier New, monospace;
    font-size: @size;
    font-weight: @weight;
    line-height: @lineHeight;
  }
}

// Grid System
.fixed-container() {
  width: @siteWidth;
  margin-left: auto;
  margin-right: auto;
  .clearfix();
}
.columns(@columnSpan: 1) {
  width: (@gridColumnWidth * @columnSpan) + (@gridGutterWidth * (@columnSpan - 1));
}
.offset(@columnOffset: 1) {
  margin-left: (@gridColumnWidth * @columnOffset) + (@gridGutterWidth * (@columnOffset - 1)) + @extraSpace;
}
// Necessary grid styles for every column to make them appear next to each other horizontally
.gridColumn() {
  display: inline;
  float: left;
  margin-left: @gridGutterWidth;
}
// makeColumn can be used to mark any element (e.g., .content-primary) as a column without changing markup to .span something
.makeColumn(@columnSpan: 1) {
  .gridColumn();
  .columns(@columnSpan);
}

// Border Radius
.border-radius(@radius: 5px) {
  -webkit-border-radius: @radius;
     -moz-border-radius: @radius;
          border-radius: @radius;
}

// Drop shadows
.box-shadow(@shadow: 0 1px 3px rgba(0,0,0,.25)) {
  -webkit-box-shadow: @shadow;
     -moz-box-shadow: @shadow;
          box-shadow: @shadow;
}

// Transitions
.transition(@transition) {
  -webkit-transition: @transition;
     -moz-transition: @transition;
      -ms-transition: @transition;
       -o-transition: @transition;
          transition: @transition;
}

// Background clipping
.background-clip(@clip) {
  -webkit-background-clip: @clip;
     -moz-background-clip: @clip;
          background-clip: @clip;
}

// CSS3 Content Columns
.content-columns(@columnCount, @columnGap: 20px) {
  -webkit-column-count: @columnCount;
     -moz-column-count: @columnCount;
          column-count: @columnCount;
  -webkit-column-gap: @columnGap;
     -moz-column-gap: @columnGap;
          column-gap: @columnGap;
}

// Add an alphatransparency value to any background or border color (via Elyse Holladay)
#translucent {
  .background(@color: @white, @alpha: 1) {
    background-color: hsla(hue(@color), saturation(@color), lightness(@color), @alpha);
  }
  .border(@color: @white, @alpha: 1) {
    border-color: hsla(hue(@color), saturation(@color), lightness(@color), @alpha);
    background-clip: padding-box;
  }
}

// Gradient Bar Colors for buttons and allerts
.gradientBar(@primaryColor, @secondaryColor) {
  #gradient > .vertical(@primaryColor, @secondaryColor);
  text-shadow: 0 -1px 0 rgba(0,0,0,.25);
  border-color: @secondaryColor @secondaryColor darken(@secondaryColor, 15%);
  border-color: rgba(0,0,0,.1) rgba(0,0,0,.1) fadein(rgba(0,0,0,.1), 15%);
}

// Gradients
#gradient {
  .horizontal (@startColor: #555, @endColor: #333) {
    background-color: @endColor;
    background-repeat: repeat-x;
    background-image: -khtml-gradient(linear, left top, right top, from(@startColor), to(@endColor)); // Konqueror
    background-image: -moz-linear-gradient(left, @startColor, @endColor); // FF 3.6+
    background-image: -ms-linear-gradient(left, @startColor, @endColor); // IE10
    background-image: -webkit-gradient(linear, left top, right top, color-stop(0%, @startColor), color-stop(100%, @endColor)); // Safari 4+, Chrome 2+
    background-image: -webkit-linear-gradient(left, @startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -o-linear-gradient(left, @startColor, @endColor); // Opera 11.10
    background-image: linear-gradient(left, @startColor, @endColor); // Le standard
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",@startColor,@endColor)); // IE9 and down
  }
  .vertical (@startColor: #555, @endColor: #333) {
    background-color: @endColor;
    background-repeat: repeat-x;
    background-image: -khtml-gradient(linear, left top, left bottom, from(@startColor), to(@endColor)); // Konqueror
    background-image: -moz-linear-gradient(top, @startColor, @endColor); // FF 3.6+
    background-image: -ms-linear-gradient(top, @startColor, @endColor); // IE10
    background-image: -webkit-gradient(linear, left top, left bottom, color-stop(0%, @startColor), color-stop(100%, @endColor)); // Safari 4+, Chrome 2+
    background-image: -webkit-linear-gradient(top, @startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -o-linear-gradient(top, @startColor, @endColor); // Opera 11.10
    background-image: linear-gradient(top, @startColor, @endColor); // The standard
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",@startColor,@endColor)); // IE9 and down
  }
  .directional (@startColor: #555, @endColor: #333, @deg: 45deg) {
    background-color: @endColor;
    background-repeat: repeat-x;
    background-image: -moz-linear-gradient(@deg, @startColor, @endColor); // FF 3.6+
    background-image: -ms-linear-gradient(@deg, @startColor, @endColor); // IE10
    background-image: -webkit-linear-gradient(@deg, @startColor, @endColor); // Safari 5.1+, Chrome 10+
    background-image: -o-linear-gradient(@deg, @startColor, @endColor); // Opera 11.10
    background-image: linear-gradient(@deg, @startColor, @endColor); // The standard
  }
  .vertical-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
    background-color: @endColor;
    background-repeat: no-repeat;
    background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
    background-image: -webkit-linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-image: -moz-linear-gradient(top, @startColor, @midColor @colorStop, @endColor);
    background-image: -ms-linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-image: -o-linear-gradient(@startColor, @midColor @colorStop, @endColor);
    background-image: linear-gradient(@startColor, @midColor @colorStop, @endColor);
    filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",@startColor,@endColor)); // IE9 and down, gets no color-stop at all for proper fallback
  }
}

// Reset filters for IE
.reset-filter() {
  filter: e(%("progid:DXImageTransform.Microsoft.gradient(enabled = false)"));
}

// Opacity
.opacity(@opacity: 100) {
  filter: e(%("alpha(opacity=%d)", @opacity));
  -khtml-opacity: @opacity / 100;
    -moz-opacity: @opacity / 100;
         opacity: @opacity / 100;
}