Skip to content

Commit

Permalink
Bring in latest from RFS v8.x
Browse files Browse the repository at this point in the history
  • Loading branch information
@mdo
mdo committed Jul 26, 2021
1 parent 3e13bb8 commit 56c095d
Showing 1 changed file with 75 additions and 93 deletions.
168 changes: 75 additions & 93 deletions scss/vendor/_rfs.scss
View file
Original file line number Diff line number Diff line change
Expand Up @@ -2,21 +2,29 @@

// SCSS RFS mixin
//
// Automated font-resizing
// Automated responsive font sizes
//
// See https://github.com/twbs/rfs
// 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;

// Resize font-size based on screen height and width
@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
Expand Down Expand Up @@ -60,7 +68,49 @@ $rfs-breakpoint-unit-cache: unit($rfs-breakpoint);
$rfs-breakpoint: $rfs-breakpoint / ($rfs-breakpoint * 0 + 1 / $rfs-rem-value);
}

// Responsive font-size mixin
// 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);
Expand All @@ -73,128 +123,60 @@ $rfs-breakpoint-unit-cache: unit($rfs-breakpoint);
font-size: #{$fs}#{$rfs-suffix};
}
@else {
// Variables for storing static and fluid rescaling
$rfs-static: null;
$rfs-fluid: null;

// Remove px-unit from $fs for calculations
// 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
@if $rfs-font-size-unit == rem {
$rfs-static: #{$fs / $rfs-rem-value}rem#{$rfs-suffix};
}
@else if $rfs-font-size-unit == px {
$rfs-static: #{$fs}px#{$rfs-suffix};
// 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}#{$rfs-suffix};
}
@else {
@error "`#{$rfs-font-size-unit}` is not a valid unit for $rfs-font-size-unit. Use `px` or `rem`.";
}

// Only add media query if font-size is bigger as the minimum font-size
// If $rfs-factor == 1, no rescaling will take place
@if $fs > $rfs-base-font-size and $enable-responsive-font-sizes {
$min-width: null;
$variable-unit: null;

// Calculate minimum font-size for given font-size
// Calculate the minimum font size for $fs
$fs-min: $rfs-base-font-size + ($fs - $rfs-base-font-size) / $rfs-factor;

// Calculate difference between given font-size and minimum font-size for given font-size
// Calculate difference between $fs and the minimum font size
$fs-diff: $fs - $fs-min;

// Base font-size formatting
// No need to check if the unit is valid, because we did that before
$min-width: if($rfs-font-size-unit == rem, #{$fs-min / $rfs-rem-value}rem, #{$fs-min}px);

// If two-dimensional, use smallest of screen width and height
// 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.
// Set the calculated font-size
$rfs-fluid: calc(#{$min-width} + #{$variable-width}) #{$rfs-suffix};
}

// Rendering
@if $rfs-fluid == null {
// Only render static font-size if no fluid font-size is available
font-size: $rfs-static;
}
@else {
$mq-value: null;
// Breakpoint formatting
$mq-value: if($rfs-breakpoint-unit == px, #{$rfs-breakpoint}px, #{$rfs-breakpoint / $rfs-rem-value}#{$rfs-breakpoint-unit});

// RFS breakpoint formatting
@if $rfs-breakpoint-unit == em or $rfs-breakpoint-unit == rem {
$mq-value: #{$rfs-breakpoint / $rfs-rem-value}#{$rfs-breakpoint-unit};
}
@else if $rfs-breakpoint-unit == px {
$mq-value: #{$rfs-breakpoint}px;
}
@else {
@error "`#{$rfs-breakpoint-unit}` is not a valid unit for $rfs-breakpoint-unit. Use `px`, `em` or `rem`.";
@include _rfs-disable-class {
font-size: #{$rfs-static}#{$rfs-suffix};
}

@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 {
font-size: $rfs-static;
@include _rfs-media-query($mq-value) {
@include _rfs-enable-class {
font-size: $rfs-fluid;
}
}
@else {
font-size: $rfs-static;
}

@if $rfs-two-dimensional {
@media (max-width: #{$mq-value}), (max-height: #{$mq-value}) {
@if $rfs-class == "enable" {
.enable-responsive-font-size &,
&.enable-responsive-font-size {
font-size: $rfs-fluid;
}
}
@else {
font-size: $rfs-fluid;
}

@if $rfs-safari-iframe-resize-bug-fix {
// stylelint-disable-next-line length-zero-no-unit
min-width: 0vw;
}
}
}
@else {
@media (max-width: #{$mq-value}) {
@if $rfs-class == "enable" {
.enable-responsive-font-size &,
&.enable-responsive-font-size {
font-size: $rfs-fluid;
}
}
@else {
font-size: $rfs-fluid;
}

@if $rfs-safari-iframe-resize-bug-fix {
// stylelint-disable-next-line length-zero-no-unit
min-width: 0vw;
}
}
// Include safari iframe resize fix if needed
min-width: if($rfs-safari-iframe-resize-bug-fix, (0 * 1vw), null);
}
}
}
}

// The font-size & responsive-font-size mixin uses RFS to rescale font sizes
// The font-size & responsive-font-size mixins use RFS to rescale the font size
@mixin font-size($fs, $important: false) {
@include rfs($fs, $important);
}
Expand Down

0 comments on commit 56c095d

Please sign in to comment.