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// Stylus RFS mixin
//
// Automated responsive values for font sizes, paddings, margins and much more
//
// Licensed under MIT (https://github.com/twbs/rfs/blob/main/LICENSE)
// Configuration
// Base value
$rfs-base-value ?= 1.25rem
$rfs-unit ?= rem
// Breakpoint at where values start decreasing if screen width is smaller
$rfs-breakpoint ?= 1200px
$rfs-breakpoint-unit ?= px
// Resize values based on screen height and width
$rfs-two-dimensional ?= false
// Factor of decrease
$rfs-factor ?= 10
// Mode. Possibilities: "min-media-query", "max-media-query"
$rfs-mode ?= "min-media-query"
// Generate enable or disable classes. Possibilities: false, "enable" or "disable"
$rfs-class ?= false
// 1 rem = $rfs-rem-value px
$rfs-rem-value ?= 16
// Safari iframe resize bug: https://github.com/twbs/rfs/issues/14
$rfs-safari-iframe-resize-bug-fix ?= false
// Disable RFS by setting $enable-rfs to false
$enable-rfs ?= true
// 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"
$rfs-base-value = unit($rfs-base-value, "")
else if $rfs-base-value-unit == "rem"
$rfs-base-value = unit($rfs-base-value * $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"
$rfs-breakpoint = unit($rfs-breakpoint, "")
else if $rfs-breakpoint-unit-cache == "rem" or $rfs-breakpoint-unit-cache == "em"
$rfs-breakpoint = unit($rfs-breakpoint * $rfs-rem-value, "")
if $rfs-breakpoint-unit == px
$rfs-mq-value = unit($rfs-breakpoint, px)
else
$rfs-mq-value = unit($rfs-breakpoint / $rfs-rem-value, $rfs-breakpoint-unit)
if $rfs-mode == min-media-query
$rfs-mq-property-width = min-width
else
$rfs-mq-property-width = max-width
if $rfs-mode == min-media-query
$rfs-mq-property-height = min-height
else
$rfs-mq-property-height = max-height
_rfs-rule()
if $rfs-class == "disable" and $rfs-mode == max-media-query
&,
.disable-rfs &,
&.disable-rfs
{block}
else if $rfs-class == "enable" and $rfs-mode == min-media-query
.enable-rfs &,
&.enable-rfs
{block}
else
{block}
_rfs-media-query-rule()
if $rfs-class == "enable"
if $rfs-mode == min-media-query
{block}
+_rfs-media-query()
.enable-rfs &,
&.enable-rfs
{block}
else
if $rfs-class == disable and $rfs-mode == min-media-query
.disable-rfs &,
&.disable-rfs
{block}
+_rfs-media-query()
{block}
// Internal mixin used to determine which media query needs to be used
_rfs-media-query()
if $rfs-two-dimensional
if $rfs-mode == min-media-query
@media ({$rfs-mq-property-width}: $rfs-mq-value) and ({$rfs-mq-property-height}: $rfs-mq-value)
{block}
else
@media ({$rfs-mq-property-width}: $rfs-mq-value), ({$rfs-mq-property-height}: $rfs-mq-value)
{block}
else
@media ({$rfs-mq-property-width}: $rfs-mq-value)
{block}
// Helper function to get the formatted non-responsive value
rfs-value($value)
if $value == 0
0
else if type-of($value) != "unit"
$value
else
$unit = unit($value)
if $unit == "px"
if $rfs-unit == "rem"
unit($value / $rfs-rem-value, rem)
else
unit($value, px)
else if $unit == "rem"
if $rfs-unit == "rem"
unit($value, rem)
else
unit($value * $rfs-rem-value, px)
else
$value
// Helper function to get the responsive value calculated by RFS
rfs-fluid-value($value)
if $value == 0
0
else if type-of($value) != "unit"
$value
else if unit($value) != "px" and unit($value) != "rem"
$value
else
if unit($value) == "rem"
$value = unit($value * $rfs-rem-value, "")
else
$value = unit($value, "")
// Only add the media query if the value is greater than the minimum value
if abs($value) <= $rfs-base-value or !$enable-rfs
if $rfs-unit == "rem"
unit($value / $rfs-rem-value, rem)
else
unit($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
if $rfs-unit == rem
$min-width = unit($value-min / $rfs-rem-value, rem)
else
$min-width = unit($value-min, px)
// Use `vmin` if two-dimensional is enabled
if $rfs-two-dimensional
$variable-unit = vmin
else
$variable-unit = vw
// Calculate the variable width between 0 and $rfs-breakpoint
$variable-width = unit(round($value-diff * 100) / $rfs-breakpoint, $variable-unit)
// Return the calculated value
if $value != abs($value)
unquote("calc(-" + $min-width + " - " + $variable-width + ")")
else
unquote("calc(" + $min-width + " + " + $variable-width + ")")
// RFS mixin
rfs($values, $property = font-size)
$val = ''
$fluidVal = ''
// Loop over each value and calculate responsive & non-responsive values
for $value in $values
$val+= ' ' + rfs-value($value)
$fluidVal+= ' ' + rfs-fluid-value($value)
// Remove first space
$val = unquote(slice($val, 1))
$fluidVal = unquote(slice($fluidVal, 1))
// Do not print the media query if responsive & non-responsive values are the same
if $val == $fluidVal
{$property}: $val
else
+_rfs-rule()
if $rfs-mode == "min-media-query"
{$property}: $fluidVal
else
{$property}: $val
if $rfs-safari-iframe-resize-bug-fix and $rfs-mode == "min-media-query"
min-width: 0vw
+_rfs-media-query-rule()
if $rfs-mode == "min-media-query"
{$property}: $val
else
{$property}: $fluidVal
rfs-font-size($value)
rfs($value)
rfs-padding($value, $property = padding)
rfs($value, $property)
rfs-padding-top($value, $property = padding-top)
rfs($value, $property)
rfs-padding-right($value, $property = padding-right)
rfs($value, $property)
rfs-padding-bottom($value, $property = padding-bottom)
rfs($value, $property)
rfs-padding-left($value, $property = padding-left)
rfs($value, $property)
rfs-margin($value, $property = margin)
rfs($value, $property)
rfs-margin-top($value, $property = margin-top)
rfs($value, $property)
rfs-margin-right($value, $property = margin-right)
rfs($value, $property)
rfs-margin-bottom($value, $property = margin-bottom)
rfs($value, $property)
rfs-margin-left($value, $property = margin-left)
rfs($value, $property)
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