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// stylelint-disable property-blacklist, scss/dollar-variable-default
// SCSS RFS mixin
//
// Automated responsive values for font sizes, paddings, margins and much more
//
// Licensed under MIT (https://github.com/twbs/rfs/blob/master/LICENSE)
// Configuration
// Base value
$rfs-base-value: 1.25rem !default;
$rfs-unit: rem !default;
@if $rfs-unit != rem and $rfs-unit != px {
@error "`#{$rfs-unit}` is not a valid unit for $rfs-unit. Use `px` or `rem`.";
}
// Breakpoint at where values start decreasing if screen width is smaller
$rfs-breakpoint: 1200px !default;
$rfs-breakpoint-unit: px !default;
@if $rfs-breakpoint-unit != px and $rfs-breakpoint-unit != em and $rfs-breakpoint-unit != rem {
@error "`#{$rfs-breakpoint-unit}` is not a valid unit for $rfs-breakpoint-unit. Use `px`, `em` or `rem`.";
}
// Resize values based on screen height and width
$rfs-two-dimensional: false !default;
// Factor of decrease
$rfs-factor: 10 !default;
@if type-of($rfs-factor) != number or $rfs-factor <= 1 {
@error "`#{$rfs-factor}` is not a valid $rfs-factor, it must be greater than 1.";
}
// Mode. Possibilities: "min-media-query", "max-media-query"
$rfs-mode: min-media-query !default;
// Generate enable or disable classes. Possibilities: false, "enable" or "disable"
$rfs-class: false !default;
// 1 rem = $rfs-rem-value px
$rfs-rem-value: 16 !default;
// Safari iframe resize bug: https://github.com/twbs/rfs/issues/14
$rfs-safari-iframe-resize-bug-fix: false !default;
// Disable RFS by setting $enable-rfs to false
$enable-rfs: true !default;
// Cache $rfs-base-value unit
$rfs-base-value-unit: unit($rfs-base-value);
// Remove px-unit from $rfs-base-value for calculations
@if $rfs-base-value-unit == px {
$rfs-base-value: $rfs-base-value / ($rfs-base-value * 0 + 1);
}
@else if $rfs-base-value-unit == rem {
$rfs-base-value: $rfs-base-value / ($rfs-base-value * 0 + 1 / $rfs-rem-value);
}
// Cache $rfs-breakpoint unit to prevent multiple calls
$rfs-breakpoint-unit-cache: unit($rfs-breakpoint);
// Remove unit from $rfs-breakpoint for calculations
@if $rfs-breakpoint-unit-cache == px {
$rfs-breakpoint: $rfs-breakpoint / ($rfs-breakpoint * 0 + 1);
}
@else if $rfs-breakpoint-unit-cache == rem or $rfs-breakpoint-unit-cache == "em" {
$rfs-breakpoint: $rfs-breakpoint / ($rfs-breakpoint * 0 + 1 / $rfs-rem-value);
}
// Calculate the media query value
$rfs-mq-value: if($rfs-breakpoint-unit == px, #{$rfs-breakpoint}px, #{$rfs-breakpoint / $rfs-rem-value}#{$rfs-breakpoint-unit});
$rfs-mq-property-width: if($rfs-mode == max-media-query, max-width, min-width);
$rfs-mq-property-height: if($rfs-mode == max-media-query, max-height, min-height);
// Internal mixin used to determine which media query needs to be used
@mixin _rfs-media-query {
@if $rfs-two-dimensional {
@if $rfs-mode == max-media-query {
@media (#{$rfs-mq-property-width}: #{$rfs-mq-value}), (#{$rfs-mq-property-height}: #{$rfs-mq-value}) {
@content;
}
}
@else {
@media (#{$rfs-mq-property-width}: #{$rfs-mq-value}) and (#{$rfs-mq-property-height}: #{$rfs-mq-value}) {
@content;
}
}
}
@else {
@media (#{$rfs-mq-property-width}: #{$rfs-mq-value}) {
@content;
}
}
}
// Internal mixin that adds disable classes to the selector if needed.
@mixin _rfs-rule {
@if $rfs-class == disable and $rfs-mode == max-media-query {
// Adding an extra class increases specificity, which prevents the media query to override the property
&,
.disable-rfs &,
&.disable-rfs {
@content;
}
}
@else if $rfs-class == enable and $rfs-mode == min-media-query {
.enable-rfs &,
&.enable-rfs {
@content;
}
}
@else {
@content;
}
}
// Internal mixin that adds enable classes to the selector if needed.
@mixin _rfs-media-query-rule {
@if $rfs-class == enable {
@if $rfs-mode == min-media-query {
@content;
}
@include _rfs-media-query {
.enable-rfs &,
&.enable-rfs {
@content;
}
}
}
@else {
@if $rfs-class == disable and $rfs-mode == min-media-query {
.disable-rfs &,
&.disable-rfs {
@content;
}
}
@include _rfs-media-query {
@content;
}
}
}
// Helper function to get the formatted non-responsive value
@function rfs-value($values) {
// Convert to list
$values: if(type-of($values) != list, ($values,), $values);
$val: '';
// Loop over each value and calculate value
@each $value in $values {
@if $value == 0 {
$val: $val + ' 0';
}
@else {
// Cache $value unit
$unit: if(type-of($value) == "number", unit($value), false);
@if $unit == px {
// Convert to rem if needed
$val: $val + ' ' + if($rfs-unit == rem, #{$value / ($value * 0 + $rfs-rem-value)}rem, $value);
}
@else if $unit == rem {
// Convert to px if needed
$val: $val + ' ' + if($rfs-unit == px, #{$value / ($value * 0 + 1) * $rfs-rem-value}px, $value);
}
@else {
// If $value isn't a number (like inherit) or $value has a unit (not px or rem, like 1.5em) or $ is 0, just print the value
$val: $val + ' ' + $value;
}
}
}
// Remove first space
@return unquote(str-slice($val, 2));
}
// Helper function to get the responsive value calculated by RFS
@function rfs-fluid-value($values) {
// Convert to list
$values: if(type-of($values) != list, ($values,), $values);
$val: '';
// Loop over each value and calculate value
@each $value in $values {
@if $value == 0 {
$val: $val + ' 0';
}
@else {
// Cache $value unit
$unit: if(type-of($value) == "number", unit($value), false);
// If $value isn't a number (like inherit) or $value has a unit (not px or rem, like 1.5em) or $ is 0, just print the value
@if not $unit or $unit != px and $unit != rem {
$val: $val + ' ' + $value;
}
@else {
// Remove unit from $value for calculations
$value: $value / ($value * 0 + if($unit == px, 1, 1 / $rfs-rem-value));
// Only add the media query if the value is greater than the minimum value
@if abs($value) <= $rfs-base-value or not $enable-rfs {
$val: $val + ' ' + if($rfs-unit == rem, #{$value / $rfs-rem-value}rem, #{$value}px);
}
@else {
// Calculate the minimum value
$value-min: $rfs-base-value + (abs($value) - $rfs-base-value) / $rfs-factor;
// Calculate difference between $value and the minimum value
$value-diff: abs($value) - $value-min;
// Base value formatting
$min-width: if($rfs-unit == rem, #{$value-min / $rfs-rem-value}rem, #{$value-min}px);
// Use negative value if needed
$min-width: if($value < 0, -$min-width, $min-width);
// Use `vmin` if two-dimensional is enabled
$variable-unit: if($rfs-two-dimensional, vmin, vw);
// Calculate the variable width between 0 and $rfs-breakpoint
$variable-width: #{$value-diff * 100 / $rfs-breakpoint}#{$variable-unit};
// Return the calculated value
$val: $val + ' calc(' + $min-width + if($value < 0, ' - ', ' + ') + $variable-width + ')';
}
}
}
}
// Remove first space
@return unquote(str-slice($val, 2));
}
// RFS mixin
@mixin rfs($values, $property: font-size) {
@if $values != null {
$val: rfs-value($values);
$fluidVal: rfs-fluid-value($values);
// Do not print the media query if responsive & non-responsive values are the same
@if $val == $fluidVal {
#{$property}: $val;
}
@else {
@include _rfs-rule {
#{$property}: if($rfs-mode == max-media-query, $val, $fluidVal);
// Include safari iframe resize fix if needed
min-width: if($rfs-safari-iframe-resize-bug-fix, (0 * 1vw), null);
}
@include _rfs-media-query-rule {
#{$property}: if($rfs-mode == max-media-query, $fluidVal, $val);
}
}
}
}
// Shorthand helper mixins
@mixin font-size($value) {
@include rfs($value);
}
@mixin padding($value) {
@include rfs($value, padding);
}
@mixin padding-top($value) {
@include rfs($value, padding-top);
}
@mixin padding-right($value) {
@include rfs($value, padding-right);
}
@mixin padding-bottom($value) {
@include rfs($value, padding-bottom);
}
@mixin padding-left($value) {
@include rfs($value, padding-left);
}
@mixin margin($value) {
@include rfs($value, margin);
}
@mixin margin-top($value) {
@include rfs($value, margin-top);
}
@mixin margin-right($value) {
@include rfs($value, margin-right);
}
@mixin margin-bottom($value) {
@include rfs($value, margin-bottom);
}
@mixin margin-left($value) {
@include rfs($value, margin-left);
}
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