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// Framework grid generation
//
// Used only by Bootstrap to generate the correct number of grid classes given
// any value of `$grid-columns`.
@mixin make-grid-columns($columns: $grid-columns, $gutter: $grid-gutter-width, $breakpoints: $grid-breakpoints) {
// Common properties for all breakpoints
%grid-column {
position: relative;
width: 100%;
padding-right: $gutter / 2;
padding-left: $gutter / 2;
}
@each $breakpoint in map-keys($breakpoints) {
$infix: breakpoint-infix($breakpoint, $breakpoints);
@if $columns > 0 {
// Allow columns to stretch full width below their breakpoints
@for $i from 1 through $columns {
.col#{$infix}-#{$i} {
@extend %grid-column;
}
}
}
.col#{$infix},
.col#{$infix}-auto {
@extend %grid-column;
}
@include media-breakpoint-up($breakpoint, $breakpoints) {
// Provide basic `.col-{bp}` classes for equal-width flexbox columns
.col#{$infix} {
flex-basis: 0;
flex-grow: 1;
max-width: 100%;
}
@if $grid-row-columns > 0 {
@for $i from 1 through $grid-row-columns {
.row-cols#{$infix}-#{$i} {
@include row-cols($i);
}
}
}
.col#{$infix}-auto {
@include make-col-auto();
}
@if $columns > 0 {
@for $i from 1 through $columns {
.col#{$infix}-#{$i} {
@include make-col($i, $columns);
}
}
}
.order#{$infix}-first { order: -1; }
.order#{$infix}-last { order: $columns + 1; }
@for $i from 0 through $columns {
.order#{$infix}-#{$i} { order: $i; }
}
@if $columns > 0 {
// `$columns - 1` because offsetting by the width of an entire row isn't possible
@for $i from 0 through ($columns - 1) {
@if not ($infix == "" and $i == 0) { // Avoid emitting useless .offset-0
.offset#{$infix}-#{$i} {
@include make-col-offset($i, $columns);
}
}
}
}
}
}
}
/// Grid system
//
// Generate semantic grid columns with these mixins.
@mixin make-container($gutter: $grid-gutter-width) {
width: 100%;
padding-right: $gutter / 2;
padding-left: $gutter / 2;
margin-right: auto;
margin-left: auto;
}
@mixin make-row($gutter: $grid-gutter-width) {
display: flex;
flex-wrap: wrap;
margin-right: -$gutter / 2;
margin-left: -$gutter / 2;
}
// For each breakpoint, define the maximum width of the container in a media query
@mixin make-container-max-widths($max-widths: $container-max-widths, $breakpoints: $grid-breakpoints) {
@each $breakpoint, $container-max-width in $max-widths {
@include media-breakpoint-up($breakpoint, $breakpoints) {
max-width: $container-max-width;
}
}
@include deprecate("The `make-container-max-widths` mixin", "v4.5.2", "v5");
}
@mixin make-col-ready($gutter: $grid-gutter-width) {
position: relative;
// Prevent columns from becoming too narrow when at smaller grid tiers by
// always setting `width: 100%;`. This works because we use `flex` values
// later on to override this initial width.
width: 100%;
padding-right: $gutter / 2;
padding-left: $gutter / 2;
}
@mixin make-col($size, $columns: $grid-columns) {
flex: 0 0 percentage($size / $columns);
// Add a `max-width` to ensure content within each column does not blow out
// the width of the column. Applies to IE10+ and Firefox. Chrome and Safari
// do not appear to require this.
max-width: percentage($size / $columns);
}
@mixin make-col-auto() {
flex: 0 0 auto;
width: auto;
max-width: 100%; // Reset earlier grid tiers
}
@mixin make-col-offset($size, $columns: $grid-columns) {
$num: $size / $columns;
margin-left: if($num == 0, 0, percentage($num));
}
// Row columns
//
// Specify on a parent element(e.g., .row) to force immediate children into NN
// numberof columns. Supports wrapping to new lines, but does not do a Masonry
// style grid.
@mixin row-cols($count) {
& > * {
flex: 0 0 100% / $count;
max-width: 100% / $count;
}
}
// Hover mixin and `$enable-hover-media-query` are deprecated.
//
// Originally added during our alphas and maintained during betas, this mixin was
// designed to prevent `:hover` stickiness on iOS-an issue where hover styles
// would persist after initial touch.
//
// For backward compatibility, we've kept these mixins and updated them to
// always return their regular pseudo-classes instead of a shimmed media query.
//
// Issue: https://github.com/twbs/bootstrap/issues/25195
@mixin hover() {
&:hover { @content; }
}
@mixin hover-focus() {
&:hover,
&:focus {
@content;
}
}
@mixin plain-hover-focus() {
&,
&:hover,
&:focus {
@content;
}
}
@mixin hover-focus-active() {
&:hover,
&:focus,
&:active {
@content;
}
}
// Image Mixins
// - Responsive image
// - Retina image
// Responsive image
//
// Keep images from scaling beyond the width of their parents.
@mixin img-fluid() {
// Part 1: Set a maximum relative to the parent
max-width: 100%;
// Part 2: Override the height to auto, otherwise images will be stretched
// when setting a width and height attribute on the img element.
height: auto;
}
// Retina image
//
// Short retina mixin for setting background-image and -size.
@mixin img-retina($file-1x, $file-2x, $width-1x, $height-1x) {
background-image: url($file-1x);
// Autoprefixer takes care of adding -webkit-min-device-pixel-ratio and -o-min-device-pixel-ratio,
// but doesn't convert dppx=>dpi.
// There's no such thing as unprefixed min-device-pixel-ratio since it's nonstandard.
// Compatibility info: https://caniuse.com/#feat=css-media-resolution
@media only screen and (min-resolution: 192dpi), // IE9-11 don't support dppx
only screen and (min-resolution: 2dppx) { // Standardized
background-image: url($file-2x);
background-size: $width-1x $height-1x;
}
@include deprecate("`img-retina()`", "v4.3.0", "v5");
}
// List Groups
@mixin list-group-item-variant($state, $background, $color) {
.list-group-item-#{$state} {
color: $color;
background-color: $background;
&.list-group-item-action {
@include hover-focus() {
color: $color;
background-color: darken($background, 5%);
}
&.active {
color: $white;
background-color: $color;
border-color: $color;
}
}
}
}
// Lists
// Unstyled keeps list items block level, just removes default browser padding and list-style
@mixin list-unstyled() {
padding-left: 0;
list-style: none;
}
// Horizontal dividers
//
// Dividers (basically an hr) within dropdowns and nav lists
@mixin nav-divider($color: $nav-divider-color, $margin-y: $nav-divider-margin-y, $ignore-warning: false) {
height: 0;
margin: $margin-y 0;
overflow: hidden;
border-top: 1px solid $color;
@include deprecate("The `nav-divider()` mixin", "v4.4.0", "v5", $ignore-warning);
}
// Pagination
@mixin pagination-size($padding-y, $padding-x, $font-size, $line-height, $border-radius) {
.page-link {
padding: $padding-y $padding-x;
@include font-size($font-size);
line-height: $line-height;
}
.page-item {
&:first-child {
.page-link {
@include border-left-radius($border-radius);
}
}
&:last-child {
.page-link {
@include border-right-radius($border-radius);
}
}
}
}
@mixin reset-text() {
font-family: $font-family-base;
// We deliberately do NOT reset font-size or word-wrap.
font-style: normal;
font-weight: $font-weight-normal;
line-height: $line-height-base;
text-align: left; // Fallback for where `start` is not supported
text-align: start;
text-decoration: none;
text-shadow: none;
text-transform: none;
letter-spacing: normal;
word-break: normal;
word-spacing: normal;
white-space: normal;
line-break: auto;
}
// Resize anything
@mixin resizable($direction) {
overflow: auto; // Per CSS3 UI, `resize` only applies when `overflow` isn't `visible`
resize: $direction; // Options: horizontal, vertical, both
}
// Only display content to screen readers
//
// See: https://a11yproject.com/posts/how-to-hide-content/
// See: https://hugogiraudel.com/2016/10/13/css-hide-and-seek/
@mixin sr-only() {
position: absolute;
width: 1px;
height: 1px;
padding: 0;
margin: -1px; // Fix for https://github.com/twbs/bootstrap/issues/25686
overflow: hidden;
clip: rect(0, 0, 0, 0);
white-space: nowrap;
border: 0;
}
// Use in conjunction with .sr-only to only display content when it's focused.
//
// Useful for "Skip to main content" links; see https://www.w3.org/TR/2013/NOTE-WCAG20-TECHS-20130905/G1
//
// Credit: HTML5 Boilerplate
@mixin sr-only-focusable() {
&:active,
&:focus {
position: static;
width: auto;
height: auto;
overflow: visible;
clip: auto;
white-space: normal;
}
}
// Sizing shortcuts
@mixin size($width, $height: $width) {
width: $width;
height: $height;
@include deprecate("`size()`", "v4.3.0", "v5");
}
// Tables
@mixin table-row-variant($state, $background, $border: null) {
// Exact selectors below required to override `.table-striped` and prevent
// inheritance to nested tables.
.table-#{$state} {
&,
> th,
> td {
background-color: $background;
}
@if $border != null {
th,
td,
thead th,
tbody + tbody {
border-color: $border;
}
}
}
// Hover states for `.table-hover`
// Note: this is not available for cells or rows within `thead` or `tfoot`.
.table-hover {
$hover-background: darken($background, 5%);
.table-#{$state} {
@include hover() {
background-color: $hover-background;
> td,
> th {
background-color: $hover-background;
}
}
}
}
}
// stylelint-disable declaration-no-important
// Typography
@mixin text-emphasis-variant($parent, $color, $ignore-warning: false) {
#{$parent} {
color: $color !important;
}
@if $emphasized-link-hover-darken-percentage != 0 {
a#{$parent} {
@include hover-focus() {
color: darken($color, $emphasized-link-hover-darken-percentage) !important;
}
}
}
@include deprecate("`text-emphasis-variant()`", "v4.4.0", "v5", $ignore-warning);
}
// CSS image replacement
@mixin text-hide($ignore-warning: false) {
// stylelint-disable-next-line font-family-no-missing-generic-family-keyword
font: 0/0 a;
color: transparent;
text-shadow: none;
background-color: transparent;
border: 0;
@include deprecate("`text-hide()`", "v4.1.0", "v5", $ignore-warning);
}
// Text truncate
// Requires inline-block or block for proper styling
@mixin text-truncate() {
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}
// stylelint-disable property-blacklist
@mixin transition($transition...) {
@if length($transition) == 0 {
$transition: $transition-base;
}
@if length($transition) > 1 {
@each $value in $transition {
@if $value == null or $value == none {
@warn "The keyword 'none' or 'null' must be used as a single argument.";
}
}
}
@if $enable-transitions {
@if nth($transition, 1) != null {
transition: $transition;
}
@if $enable-prefers-reduced-motion-media-query and nth($transition, 1) != null and nth($transition, 1) != none {
@media (prefers-reduced-motion: reduce) {
transition: none;
}
}
}
}
// stylelint-disable declaration-no-important
// Visibility
@mixin invisible($visibility) {
visibility: $visibility !important;
@include deprecate("`invisible()`", "v4.3.0", "v5");
}
// stylelint-disable declaration-no-important
.align-baseline { vertical-align: baseline !important; } // Browser default
.align-top { vertical-align: top !important; }
.align-middle { vertical-align: middle !important; }
.align-bottom { vertical-align: bottom !important; }
.align-text-bottom { vertical-align: text-bottom !important; }
.align-text-top { vertical-align: text-top !important; }
// stylelint-disable declaration-no-important
@each $color, $value in $theme-colors {
@include bg-variant(".bg-#{$color}", $value, true);
}
@if $enable-gradients {
@each $color, $value in $theme-colors {
@include bg-gradient-variant(".bg-gradient-#{$color}", $value, true);
}
}
.bg-white {
background-color: $white !important;
}
.bg-transparent {
background-color: transparent !important;
}