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Bootstrap/scss/mixins/_grid.scss
Mark Otto 3cf51c6ac9
Add Sass variable for CSS variable prefix (#31684)
* Add Sass variable for CSS variable prefix

* Update other --bs-* var instances
2020-09-30 08:32:58 +03:00

121 lines
3.8 KiB
SCSS

/// Grid system
//
// Generate semantic grid columns with these mixins.
@mixin make-row($gutter: $grid-gutter-width) {
--#{$variable-prefix}gutter-x: #{$gutter};
--#{$variable-prefix}gutter-y: 0;
display: flex;
flex-wrap: wrap;
margin-top: calc(var(--#{$variable-prefix}gutter-y) * -1); // stylelint-disable-line function-disallowed-list
margin-right: calc(var(--#{$variable-prefix}gutter-x) / -2); // stylelint-disable-line function-disallowed-list
margin-left: calc(var(--#{$variable-prefix}gutter-x) / -2); // stylelint-disable-line function-disallowed-list
}
@mixin make-col-ready($gutter: $grid-gutter-width) {
// Add box sizing if only the grid is loaded
box-sizing: if(variable-exists(include-column-box-sizing) and $include-column-box-sizing, border-box, null);
// Prevent columns from becoming too narrow when at smaller grid tiers by
// always setting `width: 100%;`. This works because we set the width
// later on to override this initial width.
flex-shrink: 0;
width: 100%;
max-width: 100%; // Prevent `.col-auto`, `.col` (& responsive variants) from breaking out the grid
padding-right: calc(var(--#{$variable-prefix}gutter-x) / 2); // stylelint-disable-line function-disallowed-list
padding-left: calc(var(--#{$variable-prefix}gutter-x) / 2); // stylelint-disable-line function-disallowed-list
margin-top: var(--#{$variable-prefix}gutter-y);
}
@mixin make-col($size, $columns: $grid-columns) {
flex: 0 0 auto;
width: percentage($size / $columns);
}
@mixin make-col-auto() {
flex: 0 0 auto;
width: auto;
}
@mixin make-col-offset($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 auto;
width: 100% / $count;
}
}
// Framework grid generation
//
// Used only by Bootstrap to generate the correct number of grid classes given
// any value of `$grid-columns`.
@mixin make-grid-columns($columns: $grid-columns, $gutter: $grid-gutter-width, $breakpoints: $grid-breakpoints) {
@each $breakpoint in map-keys($breakpoints) {
$infix: breakpoint-infix($breakpoint, $breakpoints);
@include media-breakpoint-up($breakpoint, $breakpoints) {
// Provide basic `.col-{bp}` classes for equal-width flexbox columns
.col#{$infix} {
flex: 1 0 0%; // Flexbugs #4: https://github.com/philipwalton/flexbugs#flexbug-4
}
.row-cols#{$infix}-auto > * {
@include make-col-auto();
}
@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, $columns);
}
}
// `$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);
}
}
}
}
// Gutters
//
// Make use of `.g-*`, `.gx-*` or `.gy-*` utilities to change spacing between the columns.
@each $key, $value in $gutters {
.g#{$infix}-#{$key},
.gx#{$infix}-#{$key} {
--#{$variable-prefix}gutter-x: #{$value};
}
.g#{$infix}-#{$key},
.gy#{$infix}-#{$key} {
--#{$variable-prefix}gutter-y: #{$value};
}
}
}
}
}