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Bootstrap/less/mixins.less

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//
// Mixins
// --------------------------------------------------
// Utilities
// -------------------------
// Clearfix
// Source: http://nicolasgallagher.com/micro-clearfix-hack/
//
// For modern browsers
// 1. The space content is one way to avoid an Opera bug when the
// contenteditable attribute is included anywhere else in the document.
// Otherwise it causes space to appear at the top and bottom of elements
// that are clearfixed.
// 2. The use of `table` rather than `block` is only necessary if using
// `:before` to contain the top-margins of child elements.
.clearfix() {
&:before,
&:after {
content: " "; /* 1 */
display: table; /* 2 */
}
&:after {
clear: both;
}
}
// Webkit-style focus
.tab-focus() {
// Default
outline: thin dotted #333;
// Webkit
outline: 5px auto -webkit-focus-ring-color;
outline-offset: -2px;
}
// Center-align a block level element
.center-block() {
display: block;
margin-left: auto;
margin-right: auto;
}
// Sizing shortcuts
.size(@width, @height) {
width: @width;
height: @height;
}
.square(@size) {
.size(@size, @size);
}
// Placeholder text
.placeholder(@color: @input-color-placeholder) {
&:-moz-placeholder { color: @color; } // Firefox 4-18
&::-moz-placeholder { color: @color; } // Firefox 19+
&:-ms-input-placeholder { color: @color; } // Internet Explorer 10+
&::-webkit-input-placeholder { color: @color; } // Safari and Chrome
}
// Text overflow
// Requires inline-block or block for proper styling
.text-overflow() {
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}
// CSS image replacement
// Source: https://github.com/h5bp/html5-boilerplate/commit/aa0396eae757
.hide-text() {
font: 0/0 a;
color: transparent;
text-shadow: none;
background-color: transparent;
border: 0;
}
// CSS3 PROPERTIES
// --------------------------------------------------
// Single side border-radius
.border-top-radius(@radius) {
border-top-right-radius: @radius;
border-top-left-radius: @radius;
}
.border-right-radius(@radius) {
border-bottom-right-radius: @radius;
border-top-right-radius: @radius;
}
.border-bottom-radius(@radius) {
border-bottom-right-radius: @radius;
border-bottom-left-radius: @radius;
}
.border-left-radius(@radius) {
border-bottom-left-radius: @radius;
border-top-left-radius: @radius;
}
// Drop shadows
.box-shadow(@shadow) {
-webkit-box-shadow: @shadow; // iOS <4.3 & Android <4.1
box-shadow: @shadow;
}
// Transitions
.transition(@transition) {
-webkit-transition: @transition;
-moz-transition: @transition;
-o-transition: @transition;
transition: @transition;
}
.transition-delay(@transition-delay) {
-webkit-transition-delay: @transition-delay;
-moz-transition-delay: @transition-delay;
-o-transition-delay: @transition-delay;
transition-delay: @transition-delay;
}
.transition-duration(@transition-duration) {
-webkit-transition-duration: @transition-duration;
-moz-transition-duration: @transition-duration;
-o-transition-duration: @transition-duration;
transition-duration: @transition-duration;
}
// Transformations
.rotate(@degrees) {
-webkit-transform: rotate(@degrees);
-moz-transform: rotate(@degrees);
-ms-transform: rotate(@degrees);
-o-transform: rotate(@degrees);
transform: rotate(@degrees);
}
.scale(@ratio) {
-webkit-transform: scale(@ratio);
-moz-transform: scale(@ratio);
-ms-transform: scale(@ratio);
-o-transform: scale(@ratio);
transform: scale(@ratio);
}
.translate(@x, @y) {
-webkit-transform: translate(@x, @y);
-moz-transform: translate(@x, @y);
-ms-transform: translate(@x, @y);
-o-transform: translate(@x, @y);
transform: translate(@x, @y);
}
.skew(@x, @y) {
-webkit-transform: skew(@x, @y);
-moz-transform: skew(@x, @y);
-ms-transform: skewX(@x) skewY(@y); // See https://github.com/twitter/bootstrap/issues/4885
-o-transform: skew(@x, @y);
transform: skew(@x, @y);
-webkit-backface-visibility: hidden; // See https://github.com/twitter/bootstrap/issues/5319
}
.translate3d(@x, @y, @z) {
-webkit-transform: translate3d(@x, @y, @z);
-moz-transform: translate3d(@x, @y, @z);
-o-transform: translate3d(@x, @y, @z);
transform: translate3d(@x, @y, @z);
}
// Backface visibility
// Prevent browsers from flickering when using CSS 3D transforms.
// Default value is `visible`, but can be changed to `hidden
// See git pull https://github.com/dannykeane/bootstrap.git backface-visibility for examples
.backface-visibility(@visibility){
-webkit-backface-visibility: @visibility;
-moz-backface-visibility: @visibility;
backface-visibility: @visibility;
}
// Background clipping
.background-clip(@clip) {
-webkit-background-clip: @clip;
-moz-background-clip: @clip;
background-clip: @clip;
}
// Background sizing
.background-size(@size) {
-webkit-background-size: @size;
-moz-background-size: @size;
-o-background-size: @size;
background-size: @size;
}
// Box sizing
.box-sizing(@boxmodel) {
-webkit-box-sizing: @boxmodel;
-moz-box-sizing: @boxmodel;
box-sizing: @boxmodel;
}
// User select
// For selecting text on the page
.user-select(@select) {
-webkit-user-select: @select;
-moz-user-select: @select;
-ms-user-select: @select;
-o-user-select: @select;
user-select: @select;
}
// Resize anything
.resizable(@direction) {
resize: @direction; // Options: horizontal, vertical, both
overflow: auto; // Safari fix
}
// CSS3 Content Columns
.content-columns(@column-count, @column-gap: @grid-gutter-width) {
-webkit-column-count: @column-count;
-moz-column-count: @column-count;
column-count: @column-count;
-webkit-column-gap: @column-gap;
-moz-column-gap: @column-gap;
column-gap: @column-gap;
}
// Optional hyphenation
.hyphens(@mode: auto) {
word-wrap: break-word;
-webkit-hyphens: @mode;
-moz-hyphens: @mode;
-ms-hyphens: @mode;
-o-hyphens: @mode;
hyphens: @mode;
}
// Opacity
.opacity(@opacity) {
opacity: @opacity;
// IE8 filter
@opacity-ie: (@opacity * 100);
filter: ~"alpha(opacity=@{opacity-ie})";
}
// BACKGROUNDS
// --------------------------------------------------
// Gradients
#gradient {
.horizontal(@startColor: #555, @endColor: #333) {
background-color: @endColor;
background-image: -moz-linear-gradient(left, @startColor, @endColor); // FF 3.6+
background-image: -webkit-gradient(linear, 0 0, 100% 0, from(@startColor), to(@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(to right, @startColor, @endColor); // Standard, IE10
background-repeat: repeat-x;
filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",argb(@startColor),argb(@endColor))); // IE9 and down
}
.vertical(@startColor: #555, @endColor: #333) {
background-color: @endColor;
background-image: -moz-linear-gradient(top, @startColor, @endColor); // FF 3.6+
background-image: -webkit-gradient(linear, 0 0, 0 100%, from(@startColor), to(@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(to bottom, @startColor, @endColor); // Standard, IE10
background-repeat: repeat-x;
filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@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: -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); // Standard, IE10
}
.horizontal-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
background-color: mix(@midColor, @endColor, 80%);
background-image: -webkit-gradient(left, linear, 0 0, 0 100%, from(@startColor), color-stop(@colorStop, @midColor), to(@endColor));
background-image: -webkit-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
background-image: -moz-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
background-image: -o-linear-gradient(left, @startColor, @midColor @colorStop, @endColor);
background-image: linear-gradient(to right, @startColor, @midColor @colorStop, @endColor);
background-repeat: no-repeat;
filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=1)",argb(@startColor),argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
}
.vertical-three-colors(@startColor: #00b3ee, @midColor: #7a43b6, @colorStop: 50%, @endColor: #c3325f) {
background-color: mix(@midColor, @endColor, 80%);
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: -o-linear-gradient(@startColor, @midColor @colorStop, @endColor);
background-image: linear-gradient(@startColor, @midColor @colorStop, @endColor);
background-repeat: no-repeat;
filter: e(%("progid:DXImageTransform.Microsoft.gradient(startColorstr='%d', endColorstr='%d', GradientType=0)",argb(@startColor),argb(@endColor))); // IE9 and down, gets no color-stop at all for proper fallback
}
.radial(@innerColor: #555, @outerColor: #333) {
background-color: @outerColor;
background-image: -webkit-gradient(radial, center center, 0, center center, 460, from(@innerColor), to(@outerColor));
background-image: -webkit-radial-gradient(circle, @innerColor, @outerColor);
background-image: -moz-radial-gradient(circle, @innerColor, @outerColor);
background-image: -o-radial-gradient(circle, @innerColor, @outerColor);
background-image: radial-gradient(circle, @innerColor, @outerColor);
background-repeat: no-repeat;
}
.striped(@color: #555, @angle: 45deg) {
background-color: @color;
background-image: -webkit-gradient(linear, 0 100%, 100% 0, color-stop(.25, rgba(255,255,255,.15)), color-stop(.25, transparent), color-stop(.5, transparent), color-stop(.5, rgba(255,255,255,.15)), color-stop(.75, rgba(255,255,255,.15)), color-stop(.75, transparent), to(transparent));
background-image: -webkit-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
background-image: -moz-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
background-image: -o-linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
background-image: linear-gradient(@angle, rgba(255,255,255,.15) 25%, transparent 25%, transparent 50%, rgba(255,255,255,.15) 50%, rgba(255,255,255,.15) 75%, transparent 75%, transparent);
}
}
// Reset filters for IE
.reset-filter() {
filter: e(%("progid:DXImageTransform.Microsoft.gradient(enabled = false)"));
}
// RETINA IMAGE SUPPORT
// --------------------------------------------------
// Short retina mixin for setting background-image and -size
.retina-image(@file-1x, @file-2x, @width-1x, @height-1x) {
background-image: url("@{file-1x}");
@media
only screen and (-webkit-min-device-pixel-ratio: 2),
only screen and ( min--moz-device-pixel-ratio: 2),
only screen and ( -o-min-device-pixel-ratio: 2/1),
only screen and ( min-device-pixel-ratio: 2),
only screen and ( min-resolution: 192dpi),
only screen and ( min-resolution: 2dppx) {
background-image: url("@{file-2x}");
background-size: @width-1x @height-1x;
}
}
// COMPONENT MIXINS
// --------------------------------------------------
// Horizontal dividers
// -------------------------
// Dividers (basically an hr) within dropdowns and nav lists
.nav-divider(@top: #e5e5e5, @bottom: #fff) {
height: 2px; // 1px for background, one for border
margin: ((@line-height-base / 2) - 1) 0;
overflow: hidden;
background-color: @top;
border-bottom: 1px solid @bottom;
}
// Button psuedo states
// -------------------------
// Easily pump out default styles, as well as :hover, :focus, :active,
// and disabled options for all buttons
.btn-pseudo-states(@background, @border) {
background-color: @background;
border-color: @border;
&:hover,
&:focus,
&:active,
&.active {
background-color: darken(@background, 5%);
border-color: darken(@border, 10%);
}
&.disabled,
&[disabled],
fieldset[disabled] & {
&:hover,
&:focus,
&:active,
&.active {
background-color: @background;
border-color: @border
}
}
}
// Navbar vertical align
// -------------------------
// Vertically center elements in the navbar.
// Example: an element has a height of 30px, so write out `.navbarVerticalAlign(30px);` to calculate the appropriate top margin.
.navbar-vertical-align(@element-height) {
margin-top: ((@navbar-height - @element-height) / 2);
margin-bottom: ((@navbar-height - @element-height) / 2);
}
// Grid System
// -----------
// Centered container element
.container-fixed() {
margin-right: auto;
margin-left: auto;
.clearfix();
}
// Make a grid
// Creates a wrapper for a series of columns
.make-row() {
// Then clear the floated columns
.clearfix();
// Negative margin nested rows out to align the content of columns
.row {
margin-left: (@grid-gutter-width / -2);
margin-right: (@grid-gutter-width / -2);
}
}
// Generate the columns
.make-column(@columns) {
@media (min-width: @grid-float-breakpoint) {
float: left;
// Calculate width based on number of columns available
width: percentage(@columns / @grid-columns);
}
// Prevent columns from collapsing when empty
min-height: 1px;
// Set inner padding as gutters instead of margin
padding-left: (@grid-gutter-width / 2);
padding-right: (@grid-gutter-width / 2);
}
// Generate the column offsets
.make-column-offset(@columns) {
@media (min-width: @grid-float-breakpoint) {
margin-left: percentage((@columns / @grid-columns));
}
}
.make-column-push(@columns) {
@media (min-width: @grid-float-breakpoint) {
left: percentage((@columns / @grid-columns));
}
}
.make-column-pull(@columns) {
@media (min-width: @grid-float-breakpoint) {
right: percentage((@columns / @grid-columns));
}
}
// The Grid
.generate-grid-columns(@grid-columns) {
// Default columns
.col-span-X (@index) when (@index > 0) {
.col-span-@{index} { .col-span-(@index); }
.col-span-X((@index - 1));
}
.col-span-X(0) {}
// Offsets (gaps between columns)
.col-offset-X (@index) when (@index > 0) {
.col-offset-@{index} { .col-offset-(@index); }
.col-offset-X((@index - 1));
}
.col-offset-X (0) {}
// Source ordering
.col-push-X (@index) when (@index > 0) {
.col-push-@{index} { .col-push-(@index); }
.col-push-X((@index - 1));
}
.col-push-X (0) {}
// Source ordering
.col-pull-X (@index) when (@index > 0) {
.col-pull-@{index} { .col-pull-(@index); }
.col-pull-X((@index - 1));
}
.col-pull-X (0) {}
// Apply the styles
.col-span-(@columns) {
width: percentage((@columns / @grid-columns));
}
.col-offset-(@columns) {
margin-left: percentage((@columns / @grid-columns));
}
.col-push-(@columns) {
left: percentage((@columns / @grid-columns));
}
.col-pull-(@columns) {
right: percentage((@columns / @grid-columns));
}
// Generate .spanX and .offsetX
.col-span-X(@grid-columns);
.col-offset-X(@grid-columns);
.col-push-X(@grid-columns);
.col-pull-X(@grid-columns);
}
// Framework mixins
// --------------------------------------------------
// Generate rem font-sizes with pixel fallbacks
// By default uses `@font-size-base` with an initial value of 14 (1.4rem or 14px)
.font-size(@font-size: @font-size-base) {
@rem-size: (@font-size / 10);
font-size: ~"@{font-size}px";
font-size: ~"@{rem-size}rem";
}
// Generate form validation states
.formFieldState(@text-color: #555, @border-color: #ccc, @background-color: #f5f5f5) {
// Color the label text
.control-label {
color: @text-color;
}
// Set the border and box shadow on specific inputs to match
.input-with-feedback {
padding-right: 32px; // to account for the feedback icon
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%);
@shadow: inset 0 1px 1px rgba(0,0,0,.075), 0 0 6px lighten(@border-color, 20%);
.box-shadow(@shadow);
}
}
}
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