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// stylelint-disable declaration-property-value-blacklist, scss/selector-no-redundant-nesting-selector
// Less RFS mixin
//
// Automated font-resizing
//
// See https://github.com/twbs/rfs
// Configuration
// Base font size
@rfs-base-font-size: 1.25rem;
@rfs-font-size-unit: rem;
// Breakpoint at where font-size starts decreasing if screen width is smaller
@rfs-breakpoint: 1200px;
@rfs-breakpoint-unit: px;
// Resize font-size based on screen height and width
@rfs-two-dimensional: false;
// Factor of decrease
@rfs-factor: 10;
// 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-responsive-font-sizes to false
@enable-responsive-font-sizes: true;
// Responsive font-size mixin
.rfs(@fs, @important: false) {
& when (not(@important)) {
._rfs-prefix(@fs, ~"");
}
& when (@important) {
._rfs-prefix(@fs, ~" !important");
}
}
._rfs-prefix(@fs, @suffix) {
& when ((not(isunit(@fs, px)) and not(isunit(@fs, rem)) and not((isnumber(@fs)) and (get-unit(@fs) = ~""))) or (@fs = 0)) {
font-size: @fs @suffix;
}
& when (((isnumber(@fs)) and (get-unit(@fs) = ~"")) or (isunit(@fs, px)) or (isunit(@fs, rem))) {
._rfs-render-base(@fs, @suffix);
}
}
._rfs-render-base(@fs, @suffix) {
& when ((isnumber(@fs)) and (get-unit(@fs) = ~"")) {
._rfs-render-base-number(@fs, @suffix);
._rfs-render-media-query(@fs, @suffix);
}
& when ((isunit(@fs, px))) {
._rfs-render-base-number(unit(@fs), @suffix);
._rfs-render-media-query(unit(@fs), @suffix);
}
& when ((isunit(@fs, rem))) {
._rfs-render-base-number(unit(@fs/.0625), @suffix);
._rfs-render-media-query(unit(@fs/.0625), @suffix);
}
}
._rfs-render-media-query(@fs, @suffix) {
& when ((@fs > @rfs-base-font-size) and (@rfs-factor > 1) and (@enable-responsive-font-sizes = true)) {
& when ((isnumber(@rfs-breakpoint)) and (get-unit(@rfs-breakpoint) = ~"")) {
._rfs-render-media-query-breakpoint(@fs, @suffix, @rfs-breakpoint);
}
& when ((isunit(@rfs-breakpoint, px))) {
._rfs-render-media-query-breakpoint(@fs, @suffix, unit(@rfs-breakpoint));
}
& when ((isunit(@rfs-breakpoint, rem))) {
._rfs-render-media-query-breakpoint(@fs, @suffix, unit(@rfs-breakpoint * @rfs-rem-value));
}
& when ((isunit(@rfs-breakpoint, em))) {
._rfs-render-media-query-breakpoint(@fs, @suffix, unit(@rfs-breakpoint * @rfs-rem-value));
}
}
}
._rfs-render-media-query-breakpoint(@fs, @suffix, @breakpoint) {
& when (@rfs-two-dimensional) {
._rfs-render-media-query-two-dimensional(@fs, @suffix, @breakpoint);
}
& when (not(@rfs-two-dimensional)) {
._rfs-render-media-query-one-dimension(@fs, @suffix, @breakpoint);
}
}
._rfs-render-media-query-one-dimension(@fs, @suffix, @breakpoint) {
& when (@rfs-breakpoint-unit = px) {
@media (max-width: unit(@breakpoint, px)) {
._rfs-render-media-query-content(@fs, @suffix, @breakpoint);
}
}
& when (@rfs-breakpoint-unit = rem) {
@media (max-width: unit((@breakpoint / @rfs-rem-value), rem)) {
._rfs-render-media-query-content(@fs, @suffix, @breakpoint);
}
}
& when (@rfs-breakpoint-unit = em) {
@media (max-width: unit((@breakpoint / @rfs-rem-value), em)) {
._rfs-render-media-query-content(@fs, @suffix, @breakpoint);
}
}
}
._rfs-render-media-query-two-dimensional(@fs, @suffix, @breakpoint) {
& when (@rfs-breakpoint-unit = px) {
@media (max-width: unit(@breakpoint, px)), (max-height: unit(@breakpoint, px)) {
._rfs-render-media-query-content(@fs, @suffix, @breakpoint);
}
}
& when (@rfs-breakpoint-unit = rem) {
@media (max-width: unit((@breakpoint / @rfs-rem-value), rem)), (max-height: unit((@breakpoint / @rfs-rem-value), rem)) {
._rfs-render-media-query-content(@fs, @suffix, @breakpoint);
}
}
& when (@rfs-breakpoint-unit = em) {
@media (max-width: unit((@breakpoint / @rfs-rem-value), em)), (max-height: unit((@breakpoint / @rfs-rem-value), em)) {
._rfs-render-media-query-content(@fs, @suffix, @breakpoint);
}
}
}
._rfs-render-media-query-content(@fs, @suffix, @breakpoint) {
& when ((isnumber(@rfs-base-font-size)) and (get-unit(@rfs-base-font-size) = ~"")) {
._rfs-render-media-query-content-dimensional(@fs, @suffix, @rfs-base-font-size, @breakpoint);
}
& when ((isunit(@rfs-base-font-size, px))) {
._rfs-render-media-query-content-dimensional(@fs, @suffix, unit(@rfs-base-font-size), @breakpoint);
}
& when ((isunit(@rfs-base-font-size, rem))) {
._rfs-render-media-query-content-dimensional(@fs, @suffix, unit(@rfs-base-font-size * @rfs-rem-value), @breakpoint);
}
& when (@rfs-safari-iframe-resize-bug-fix) {
// stylelint-disable-next-line length-zero-no-unit
min-width: 0vw;
}
}
._rfs-render-media-query-content-dimensional(@fs, @suffix, @rfs-min, @breakpoint) {
& when (@rfs-two-dimensional) {
// Calculate base font-size for given font-size
@fs-min: @rfs-min + (@fs - @rfs-min) / @rfs-factor;
// Calculate difference between given font-size and base font-size for given font-size
@fs-variable-width: unit((@fs - @fs-min) / (@breakpoint / 100), vmin);
._rfs-render-enable-class(@fs-min, @fs-variable-width, @suffix);
}
& when (not(@rfs-two-dimensional)) {
// Calculate base font-size for given font-size
@fs-min: @rfs-min + (@fs - @rfs-min) / @rfs-factor;
// Calculate difference between given font-size and base font-size for given font-size
@fs-variable-width: unit((@fs - @fs-min) / (@breakpoint / 100), vw);
._rfs-render-enable-class(@fs-min, @fs-variable-width, @suffix);
}
}
._rfs-render-fluid(@fs-min, @fs-variable-width, @suffix) {
& when (@rfs-font-size-unit = px) {
font-size: calc(unit(@fs-min, px) ~"+" @fs-variable-width) @suffix;
}
& when (@rfs-font-size-unit = rem) {
font-size: calc(unit(@fs-min / @rfs-rem-value, rem) ~"+" @fs-variable-width) @suffix;
}
}
._rfs-render-enable-class(@fs-min, @fs-variable-width, @suffix) {
& when (@rfs-class = "enable") {
.enable-responsive-font-size &,
&.enable-responsive-font-size {
._rfs-render-fluid(@fs-min, @fs-variable-width, @suffix);
}
}
& when (not(@rfs-class = "enable")) {
._rfs-render-fluid(@fs-min, @fs-variable-width, @suffix);
}
}
._rfs-render-base-declaration(@fs, @suffix) {
& when (@rfs-font-size-unit = px) {
font-size: unit(@fs, px) @suffix;
}
& when (@rfs-font-size-unit = rem) {
font-size: unit((@fs / @rfs-rem-value), rem) @suffix;
}
}
._rfs-render-base-number(@fs, @suffix) {
& when (@rfs-class = "disable") {
&,
.disable-responsive-font-size &,
&.disable-responsive-font-size {
._rfs-render-base-declaration(@fs, @suffix);
}
}
& when (not(@rfs-class = "disable")) {
._rfs-render-base-declaration(@fs, @suffix);
}
}
// The responsive-font-size mixin uses RFS to rescale font sizes
.responsive-font-size(@fs, @important: false) {
.rfs(@fs, @important);
}
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