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// Breakpoint viewport sizes and media queries.
//
// Breakpoints are defined as a map of (name: minimum width), order from small to large:
//
// (xs: 0, sm: 34rem, md: 45rem)
//
// The map defined in the `$grid-breakpoints` global variable is used as the `$breakpoints` argument by default.
// Name of the next breakpoint, or null for the last breakpoint.
//
// >> breakpoint-next(sm)
// md
// >> breakpoint-next(sm, $breakpoints: (xs: 0, sm: 34rem, md: 45rem))
// md
// >> breakpoint-next(sm, $breakpoint-names: (xs sm md))
// md
@function breakpoint-next($name, $breakpoints: $grid-breakpoints, $breakpoint-names: map-keys($breakpoints)) {
$n: index($breakpoint-names, $name);
@return if($n < length($breakpoint-names), nth($breakpoint-names, $n + 1), null);
}
// Minimum breakpoint width. Null for the smallest (first) breakpoint.
//
// >> breakpoint-min(sm, (xs: 0, sm: 34rem, md: 45rem))
// 34rem
@function breakpoint-min($name, $breakpoints: $grid-breakpoints) {
$min: map-get($breakpoints, $name);
@return if($min != 0, $min, null);
}
// Maximum breakpoint width. Null for the largest (last) breakpoint.
// The maximum value is calculated as the minimum of the next one less 0.1.
//
// >> breakpoint-max(sm, (xs: 0, sm: 34rem, md: 45rem))
// 44.9rem
@function breakpoint-max($name, $breakpoints: $grid-breakpoints) {
$next: breakpoint-next($name, $breakpoints);
@return if($next, breakpoint-min($next, $breakpoints) - 0.1, null);
}
// Media of at least the minimum breakpoint width. No query for the smallest breakpoint.
// Makes the @content apply to the given breakpoint and wider.
@mixin media-breakpoint-up($name, $breakpoints: $grid-breakpoints) {
$min: breakpoint-min($name, $breakpoints);
@if $min {
@media (min-width: $min) {
@content;
}
} @else {
@content;
}
}
// Media of at most the maximum breakpoint width. No query for the largest breakpoint.
// Makes the @content apply to the given breakpoint and narrower.
@mixin media-breakpoint-down($name, $breakpoints: $grid-breakpoints) {
$max: breakpoint-max($name, $breakpoints);
@if $max {
@media (max-width: $max) {
@content;
}
} @else {
@content;
}
}
// Media between the breakpoint's minimum and maximum widths.
// No minimum for the smallest breakpoint, and no maximum for the largest one.
// Makes the @content apply only to the given breakpoint, not viewports any wider or narrower.
@mixin media-breakpoint-only($name, $breakpoints: $grid-breakpoints) {
// Nested media query combination does not work in libsass yet
// https://github.com/sass/libsass/issues/185
// Work around until the issue is resolved:
$min: breakpoint-min($name, $breakpoints);
$max: breakpoint-max($name, $breakpoints);
@if $min and $max {
@media (min-width: $min) and (max-width: $max) {
@content;
}
} @else {
// One of min or max is a no-op, so this branch is not affected by libsass#185
@include media-breakpoint-up($name, $breakpoints) {
@include media-breakpoint-down($name, $breakpoints) {
@content;
}
}
}
}
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