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// stylelint-disable property-blacklist, scss/dollar-variable-default
// SCSS RFS mixin
//
// Automated responsive font sizes
//
// Licensed under MIT (https://github.com/twbs/rfs/blob/v8.x/LICENSE)
// Configuration
// Base font size
$rfs-base-font-size: 1.25rem !default;
$rfs-font-size-unit: rem !default;
@if $rfs-font-size-unit != rem and $rfs-font-size-unit != px {
@error "`#{$rfs-font-size-unit}` is not a valid unit for $rfs-font-size-unit. Use `px` or `rem`.";
}
// Breakpoint at where font-size starts 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 font size 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.";
}
// 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-responsive-font-sizes to false
$enable-responsive-font-sizes: true !default;
// Cache $rfs-base-font-size unit
$rfs-base-font-size-unit: unit($rfs-base-font-size);
@function divide($dividend, $divisor, $precision: 10) {
$sign: if($dividend > 0 and $divisor > 0 or $dividend < 0 and $divisor < 0, 1, -1);
$dividend: abs($dividend);
$divisor: abs($divisor);
@if $dividend == 0 {
@return 0;
}
@if $divisor == 0 {
@error "Cannot divide by 0";
}
$remainder: $dividend;
$result: 0;
$factor: 10;
@while ($remainder > 0 and $precision >= 0) {
$quotient: 0;
@while ($remainder >= $divisor) {
$remainder: $remainder - $divisor;
$quotient: $quotient + 1;
}
$result: $result * 10 + $quotient;
$factor: $factor * .1;
$remainder: $remainder * 10;
$precision: $precision - 1;
@if ($precision < 0 and $remainder >= $divisor * 5) {
$result: $result + 1;
}
}
$result: $result * $factor * $sign;
$dividend-unit: unit($dividend);
$divisor-unit: unit($divisor);
$unit-map: (
"px": 1px,
"rem": 1rem,
"em": 1em,
"%": 1%
);
@if ($dividend-unit != $divisor-unit and map-has-key($unit-map, $dividend-unit)) {
$result: $result * map-get($unit-map, $dividend-unit);
}
@return $result;
}
// Remove px-unit from $rfs-base-font-size for calculations
@if $rfs-base-font-size-unit == "px" {
$rfs-base-font-size: divide($rfs-base-font-size, $rfs-base-font-size * 0 + 1);
}
@else if $rfs-base-font-size-unit == "rem" {
$rfs-base-font-size: divide($rfs-base-font-size, divide($rfs-base-font-size * 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" {
$rfs-breakpoint: divide($rfs-breakpoint, $rfs-breakpoint * 0 + 1);
}
@else if $rfs-breakpoint-unit-cache == "rem" or $rfs-breakpoint-unit-cache == "em" {
$rfs-breakpoint: divide($rfs-breakpoint, divide($rfs-breakpoint * 0 + 1, $rfs-rem-value));
}
// Internal mixin that adds disable classes to the selector if needed.
@mixin _rfs-disable-class {
@if $rfs-class == "disable" {
// Adding an extra class increases specificity, which prevents the media query to override the font size
&,
.disable-responsive-font-size &,
&.disable-responsive-font-size {
@content;
}
}
@else {
@content;
}
}
// Internal mixin that adds enable classes to the selector if needed.
@mixin _rfs-enable-class {
@if $rfs-class == "enable" {
.enable-responsive-font-size &,
&.enable-responsive-font-size {
@content;
}
}
@else {
@content;
}
}
// Internal mixin used to determine which media query needs to be used
@mixin _rfs-media-query($mq-value) {
@if $rfs-two-dimensional {
@media (max-width: #{$mq-value}), (max-height: #{$mq-value}) {
@content;
}
}
@else {
@media (max-width: #{$mq-value}) {
@content;
}
}
}
// Responsive font size mixin
@mixin rfs($fs, $important: false) {
// Cache $fs unit
$fs-unit: if(type-of($fs) == "number", unit($fs), false);
// Add !important suffix if needed
$rfs-suffix: if($important, " !important", "");
// If $fs isn't a number (like inherit) or $fs has a unit (not px or rem, like 1.5em) or $ is 0, just print the value
@if not $fs-unit or $fs-unit != "" and $fs-unit != "px" and $fs-unit != "rem" or $fs == 0 {
font-size: #{$fs}#{$rfs-suffix};
}
@else {
// Remove unit from $fs for calculations
@if $fs-unit == "px" {
$fs: divide($fs, $fs * 0 + 1);
}
@else if $fs-unit == "rem" {
$fs: divide($fs, divide($fs * 0 + 1, $rfs-rem-value));
}
// Set default font size
$rfs-static: if($rfs-font-size-unit == rem, #{divide($fs, $rfs-rem-value)}rem, #{$fs}px);
// Only add the media query if the font size is bigger than the minimum font size
@if $fs <= $rfs-base-font-size or not $enable-responsive-font-sizes {
font-size: #{$rfs-static}#{$rfs-suffix};
}
@else {
// Calculate the minimum font size for $fs
$fs-min: $rfs-base-font-size + divide($fs - $rfs-base-font-size, $rfs-factor);
// Calculate difference between $fs and the minimum font size
$fs-diff: $fs - $fs-min;
// Base font-size formatting
$min-width: if($rfs-font-size-unit == rem, #{divide($fs-min, $rfs-rem-value)}rem, #{$fs-min}px);
// Use `vmin` if two-dimensional is enabled
$variable-unit: if($rfs-two-dimensional, vmin, vw);
// Calculate the variable width between 0 and $rfs-breakpoint
$variable-width: #{divide($fs-diff * 100, $rfs-breakpoint)}#{$variable-unit};
// Set the calculated font-size
$rfs-fluid: calc(#{$min-width} + #{$variable-width}) #{$rfs-suffix};
// Breakpoint formatting
$mq-value: if($rfs-breakpoint-unit == px, #{$rfs-breakpoint}px, #{divide($rfs-breakpoint, $rfs-rem-value)}#{$rfs-breakpoint-unit});
@include _rfs-disable-class {
font-size: #{$rfs-static}#{$rfs-suffix};
}
@include _rfs-media-query($mq-value) {
@include _rfs-enable-class {
font-size: $rfs-fluid;
}
// Include safari iframe resize fix if needed
min-width: if($rfs-safari-iframe-resize-bug-fix, (0 * 1vw), null);
}
}
}
}
// The font-size & responsive-font-size mixins use RFS to rescale the font size
@mixin font-size($fs, $important: false) {
@include rfs($fs, $important);
}
@mixin responsive-font-size($fs, $important: false) {
@include rfs($fs, $important);
}