// SCSS RFS mixin
//
-// Automated responsive font sizes
+// Automated responsive values for font sizes, paddings, margins and much more
//
// 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;
+// Base value
+$rfs-base-value: 1.25rem !default;
+$rfs-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`.";
+@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 font-size starts decreasing if screen width is smaller
+// Breakpoint at where values start decreasing if screen width is smaller
$rfs-breakpoint: 1200px !default;
$rfs-breakpoint-unit: px !default;
@error "`#{$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
+// 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 $rfs-factor <= 1 {
+@if type-of($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;
// 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;
+// Disable RFS by setting $enable-rfs to false
+$enable-rfs: true !default;
-// Cache $rfs-base-font-size unit
-$rfs-base-font-size-unit: unit($rfs-base-font-size);
+// Cache $rfs-base-value unit
+$rfs-base-value-unit: unit($rfs-base-value);
-// 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);
+// 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-font-size-unit == "rem" {
- $rfs-base-font-size: $rfs-base-font-size / ($rfs-base-font-size * 0 + 1 / $rfs-rem-value);
+@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" {
+@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" {
+@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 $rfs-class == "disable" {
- // Adding an extra class increases specificity, which prevents the media query to override the font size
- &,
- .disable-responsive-font-size &,
- &.disable-responsive-font-size {
+// Calculate the media query value
+$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 $rfs-two-dimensional {
+ @media (#{$rfs-mq-property-width}: #{$rfs-mq-value}), (#{$rfs-mq-property-height}: #{$rfs-mq-value}) {
@content;
}
}
@else {
- @content;
+ @media (#{$rfs-mq-property-width}: #{$rfs-mq-value}) {
+ @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 {
+// 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 $rfs-mode == min-media-query {
+ .enable-rfs &,
+ &.enable-rfs {
@content;
}
}
}
}
-// Internal mixin used to determine which media query needs to be used
-@mixin _rfs-media-query($mq-value) {
- @if $rfs-two-dimensional {
- @media (max-width: #{$mq-value}), (max-height: #{$mq-value}) {
+// Internal mixin that adds enable classes to the selector if needed.
+@mixin _rfs-media-query-rule {
+
+ @if $rfs-class == enable {
+ @if $rfs-mode == min-media-query {
@content;
}
+
+ @include _rfs-media-query {
+ .enable-rfs &,
+ &.enable-rfs {
+ @content;
+ }
+ }
}
@else {
- @media (max-width: #{$mq-value}) {
+ @if $rfs-class == disable and $rfs-mode == min-media-query {
+ .disable-rfs &,
+ &.disable-rfs {
+ @content;
+ }
+ }
+ @include _rfs-media-query {
@content;
}
}
}
-// Responsive font size mixin
-@mixin rfs($fs, $important: false) {
- // Cache $fs unit
- $fs-unit: if(type-of($fs) == "number", unit($fs), false);
+// Helper function to get the formatted non-responsive value
+@function rfs-value($values) {
+ // Convert to list
+ $values: if(type-of($values) != list, ($values,), $values);
- // Add !important suffix if needed
- $rfs-suffix: if($important, " !important", "");
+ $val: '';
- // 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);
+ // Loop over each value and calculate value
+ @each $value in $values {
+ @if $value == 0 {
+ $val: $val + ' 0';
}
- @else if $fs-unit == "rem" {
- $fs: $fs / ($fs * 0 + 1 / $rfs-rem-value);
+ @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);
- // Set default font size
- $rfs-static: if($rfs-font-size-unit == rem, #{$fs / $rfs-rem-value}rem, #{$fs}px);
+ $val: '';
- // 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};
+ // Loop over each value and calculate value
+ @each $value in $values {
+ @if $value == 0 {
+ $val: $val + ' 0';
}
+
@else {
- // Calculate the minimum font size for $fs
- $fs-min: $rfs-base-font-size + ($fs - $rfs-base-font-size) / $rfs-factor;
+ // Cache $value unit
+ $unit: if(type-of($value) == "number", unit($value), false);
- // Calculate difference between $fs and the minimum font size
- $fs-diff: $fs - $fs-min;
+ // 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;
+ }
- // Base font-size formatting
- $min-width: if($rfs-font-size-unit == rem, #{$fs-min / $rfs-rem-value}rem, #{$fs-min}px);
+ @else {
+ // Remove unit from $value for calculations
+ $value: $value / ($value * 0 + if($unit == px, 1, 1 / $rfs-rem-value));
- // Use `vmin` if two-dimensional is enabled
- $variable-unit: if($rfs-two-dimensional, vmin, vw);
+ // 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 the variable width between 0 and $rfs-breakpoint
- $variable-width: #{$fs-diff * 100 / $rfs-breakpoint}#{$variable-unit};
+ // Calculate difference between $value and the minimum value
+ $value-diff: abs($value) - $value-min;
- // Set the calculated font-size
- $rfs-fluid: calc(#{$min-width} + #{$variable-width}) #{$rfs-suffix};
+ // Base value formatting
+ $min-width: if($rfs-unit == rem, #{$value-min / $rfs-rem-value}rem, #{$value-min}px);
- // Breakpoint formatting
- $mq-value: if($rfs-breakpoint-unit == px, #{$rfs-breakpoint}px, #{$rfs-breakpoint / $rfs-rem-value}#{$rfs-breakpoint-unit});
+ // Use negative value if needed
+ $min-width: if($value < 0, -$min-width, $min-width);
- @include _rfs-disable-class {
- font-size: #{$rfs-static}#{$rfs-suffix};
- }
+ // 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};
- @include _rfs-media-query($mq-value) {
- @include _rfs-enable-class {
- font-size: $rfs-fluid;
+ // 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, $val);
+ }
}
}
}
-// The font-size & responsive-font-size mixins use RFS to rescale the font size
-@mixin font-size($fs, $important: false) {
- @include rfs($fs, $important);
+// Shorthand helper mixins
+@mixin font-size($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($value, margin-bottom);
}
-@mixin responsive-font-size($fs, $important: false) {
- @include rfs($fs, $important);
+@mixin margin-left($value) {
+ @include rfs($value, margin-left);
}
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