// stylelint-disable property-blacklist, scss/dollar-variable-default // SCSS RFS mixin // // Automated responsive font sizes // // Licensed under MIT (https://github.com/twbs/rfs/blob/master/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); // Remove px-unit from $rfs-base-font-size for calculations @if $rfs-base-font-size-unit == "px" { $rfs-base-font-size: $rfs-base-font-size / ($rfs-base-font-size * 0 + 1); } @else if $rfs-base-font-size-unit == "rem" { $rfs-base-font-size: $rfs-base-font-size / ($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: $rfs-breakpoint / ($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); } // 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: $fs / ($fs * 0 + 1); } @else if $fs-unit == "rem" { $fs: $fs / ($fs * 0 + 1 / $rfs-rem-value); } // Set default font size $rfs-static: if($rfs-font-size-unit == rem, #{$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: $rfs-base-font-size + ($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, #{$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 $variable-width: #{$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, #{$rfs-breakpoint}px, #{$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); }