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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: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px)
//
// 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, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
// md
// >> breakpoint-next(sm, $breakpoint-names: (xs sm md lg xl xxl))
// md
@function breakpoint-next($name, $breakpoints: $grid-breakpoints, $breakpoint-names: map-keys($breakpoints)) {
$n: index($breakpoint-names, $name);
@if not $n {
@error "breakpoint `#{$name}` not found in `#{$breakpoints}`";
}
@return if($n < length($breakpoint-names), nth($breakpoint-names, $n + 1), null);
}
// Minimum breakpoint width. Null for the smallest (first) breakpoint.
//
// >> breakpoint-min(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
// 576px
@function breakpoint-min($name, $breakpoints: $grid-breakpoints) {
$min: map-get($breakpoints, $name);
@return if($min != 0, $min, null);
}
// Maximum breakpoint width.
// The maximum value is reduced by 0.02px to work around the limitations of
// `min-` and `max-` prefixes and viewports with fractional widths.
// See https://www.w3.org/TR/mediaqueries-4/#mq-min-max
// Uses 0.02px rather than 0.01px to work around a current rounding bug in Safari.
// See https://bugs.webkit.org/show_bug.cgi?id=178261
//
// >> breakpoint-max(md, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
// 767.98px
@function breakpoint-max($name, $breakpoints: $grid-breakpoints) {
$max: map-get($breakpoints, $name);
@return if($max and $max > 0, $max - .02, null);
}
// Returns a blank string if smallest breakpoint, otherwise returns the name with a dash in front.
// Useful for making responsive utilities.
//
// >> breakpoint-infix(xs, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
// "" (Returns a blank string)
// >> breakpoint-infix(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px, xxl: 1400px))
// "-sm"
@function breakpoint-infix($name, $breakpoints: $grid-breakpoints) {
@return if(breakpoint-min($name, $breakpoints) == null, "", "-#{$name}");
}
// 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: $max) {
@content;
}
} @else {
@content;
}
}
// Media that spans multiple breakpoint widths.
// Makes the @content apply between the min and max breakpoints
@mixin media-breakpoint-between($lower, $upper, $breakpoints: $grid-breakpoints) {
$min: breakpoint-min($lower, $breakpoints);
$max: breakpoint-max($upper, $breakpoints);
@if $min != null and $max != null {
@media (min-width: $min) and (max-width: $max) {
@content;
}
} @else if $max == null {
@include media-breakpoint-up($lower, $breakpoints) {
@content;
}
} @else if $min == null {
@include media-breakpoint-down($upper, $breakpoints) {
@content;
}
}
}
// Media between the breakpoint's minimum and maximum widths.
// No minimum for the smallest breakpoint, and no maximum for the largest one.
// Makes the @content apply only to the given breakpoint, not viewports any wider or narrower.
@mixin media-breakpoint-only($name, $breakpoints: $grid-breakpoints) {
$min: breakpoint-min($name, $breakpoints);
$next: breakpoint-next($name, $breakpoints);
$max: breakpoint-max($next, $breakpoints);
@if $min != null and $max != null {
@media (min-width: $min) and (max-width: $max) {
@content;
}
} @else if $max == null {
@include media-breakpoint-up($name, $breakpoints) {
@content;
}
} @else if $min == null {
@include media-breakpoint-down($next, $breakpoints) {
@content;
}
}
}
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