// 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) // // 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)) // md // >> breakpoint-next(sm, $breakpoint-names: (xs sm md lg xl)) // md @function breakpoint-next($name, $breakpoints: $grid-breakpoints, $breakpoint-names: map-keys($breakpoints)) { $n: index($breakpoint-names, $name); @return if($n != null and $n < length($breakpoint-names), nth($breakpoint-names, $n + 1), null); } // Minimum breakpoint width. Null for the smallest (first) breakpoint. // // >> breakpoint-min(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px)) // 576px @function breakpoint-min($name, $breakpoints: $grid-breakpoints) { $min: map-get($breakpoints, $name); @return if($min != 0, $min, null); } // Maximum breakpoint width. Null for the largest (last) breakpoint. // The maximum value is calculated as the minimum of the next one less 0.02px // to work around the limitations of `min-` and `max-` prefixes and viewports with fractional widths. // See https://www.w3.org/TR/mediaqueries-4/#mq-min-max // Uses 0.02px rather than 0.01px to work around a current rounding bug in Safari. // See https://bugs.webkit.org/show_bug.cgi?id=178261 // // >> breakpoint-max(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px)) // 767.98px @function breakpoint-max($name, $breakpoints: $grid-breakpoints) { $next: breakpoint-next($name, $breakpoints); @return if($next, breakpoint-min($next, $breakpoints) - .02, null); } // Returns a blank string if smallest breakpoint, otherwise returns the name with a dash in front. // Useful for making responsive utilities. // // >> breakpoint-infix(xs, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px)) // "" (Returns a blank string) // >> breakpoint-infix(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px)) // "-sm" @function breakpoint-infix($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); $max: breakpoint-max($name, $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 $min == null { @include media-breakpoint-down($name, $breakpoints) { @content; } } }