425 lines
12 KiB
SCSS
425 lines
12 KiB
SCSS
@use "sass:color";
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@use "sass:list";
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@use "sass:map";
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@use "sass:math";
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@use "initial-variables" as iv;
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@use "functions" as fn;
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@function buildVarName($name, $prefix: "", $suffix: "") {
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@return "--#{iv.$cssvars-prefix}#{$prefix}#{$name}#{$suffix}";
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}
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@function buildHslaString($name, $l, $a: 1) {
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$lightness: getVar($name, "", "-l");
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@if ($l) {
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$lightness: $l;
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}
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@return "hsla(#{getVar($name, '', '-h')}, #{getVar($name, '', '-s')}, #{$lightness}, #{$a})";
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}
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@function getVar($name, $prefix: "", $suffix: "") {
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$varName: buildVarName($name, $prefix, $suffix);
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@return var(#{$varName});
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}
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@function getVarWithBackup($name, $backup, $prefix: "", $suffix: "") {
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$varName: buildVarName($name, $prefix, $suffix);
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$backupName: buildVarName($backup, $prefix, $suffix);
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@return var(#{$varName}, var(#{$backupName}));
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}
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@function getRgbaVar($name, $alpha, $prefix: "", $suffix: "") {
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$varName: buildVarName($name, $prefix, $suffix);
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@return unquote("rgba(var(#{$varName}), #{$alpha})");
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}
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@mixin register-var($name, $value, $prefix: "", $suffix: "") {
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$varName: buildVarName($name, $prefix, $suffix);
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#{$varName}: #{$value};
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}
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@mixin register-vars($vars, $prefix: "", $suffix: "") {
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@each $name, $value in $vars {
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@include register-var($name, $value, $prefix, $suffix);
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}
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}
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@mixin register-rgb($name, $value) {
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@include register-var(
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$name,
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(red($value), green($value), blue($value)),
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"",
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"-rgb"
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);
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}
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@mixin register-hsl($name, $value) {
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@include register-var($name, round(hue($value)), "", "-h");
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@include register-var($name, round(saturation($value)), "", "-s");
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@include register-var($name, round(lightness($value)), "", "-l");
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}
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@mixin generate-on-scheme-colors($name, $base, $scheme-main) {
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// Accessibility Contrast System
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$scheme-main-brightness: fn.bulmaColorBrightness($scheme-main);
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$on-scheme-color: $base;
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$fg-lum: fn.bulmaColorLuminance($on-scheme-color);
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$bg-lum: fn.bulmaColorLuminance($scheme-main);
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$ratio: 0;
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$found-decent-color: false;
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@if ($fg-lum > $bg-lum) {
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@for $i from 0 through 20 {
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$ratio: math.div(($fg-lum + 0.05), ($bg-lum + 0.05));
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@if $ratio > 5 {
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$found-decent-color: true;
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} @else {
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$on-scheme-color: lighten($on-scheme-color, 5%);
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$fg-lum: fn.bulmaColorLuminance($on-scheme-color);
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}
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}
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} @else {
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@for $i from 0 through 20 {
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$ratio: math.div(($bg-lum + 0.05), ($fg-lum + 0.05));
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@if $ratio > 5 {
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$found-decent-color: true;
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} @else {
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$on-scheme-color: darken($on-scheme-color, 5%);
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$fg-lum: fn.bulmaColorLuminance($on-scheme-color);
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}
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}
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}
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$on-scheme-lightness: lightness($on-scheme-color);
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@include register-var($name, $on-scheme-lightness, "", "-on-scheme-l");
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$on-scheme-l: getVar($name, "", "-on-scheme-l");
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@include register-var(
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"#{$name}-on-scheme",
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buildHslaString($name, $on-scheme-l)
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);
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}
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@mixin v1-generate-on-scheme-colors($name, $base, $scheme-main) {
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// Accessibility Contrast System
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$scheme-main-brightness: fn.bulmaColorBrightness($scheme-main);
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$on-scheme-color: $base;
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@if ($scheme-main-brightness == "bright") {
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@while (fn.bulmaEnoughContrast($on-scheme-color, #fff) == false) {
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// We're on a light background, so we'll darken the test color step by step.
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$on-scheme-color: darken($on-scheme-color, 5%);
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}
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} @else {
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@while (fn.bulmaEnoughContrast($on-scheme-color, #000) == false) {
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// We're on a dark background, so we'll lighten the test color step by step.
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$on-scheme-color: lighten($on-scheme-color, 5%);
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}
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}
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$on-scheme-lightness: lightness($on-scheme-color);
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@include register-var($name, $on-scheme-lightness, "", "-on-scheme-l");
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}
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@mixin register-base-color($name, $base) {
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$hsla: buildHslaString($name, getVar($name, "", "-l"));
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@include register-var($name, $hsla);
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@include register-var($name, $hsla, "", "-base"); // Just for reference
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@include register-rgb($name, $base);
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@include register-hsl($name, $base);
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}
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@mixin generate-basic-palette($name, $base, $invert: null) {
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@include register-base-color($name, $base);
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@if $invert {
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@include register-var($name, lightness($invert), "", "-invert-l");
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@include register-var("#{$name}-invert", $invert);
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}
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}
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@mixin generate-color-palette(
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$name,
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$base,
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$scheme-main-l: 100%,
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$invert: null,
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$light: null,
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$dark: null
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) {
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$h: round(hue($base)); // Hue
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$s: round(saturation($base)); // Saturation
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$l: round(lightness($base)); // Lightness
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$base-lum: fn.bulmaColorLuminance($base);
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$l-base: round($l % 10); // Get lightness second digit: 53% -> 3%
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$l-0: 0%; // 5% or less
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$l-5: 5%; // More than 5%
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$a: 1; // Alpha
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$base-digits: "00";
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// Calculate digits like "40" for the scheme-main
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$scheme-l-0: 0%;
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$scheme-l-base: round($scheme-main-l % 10);
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$closest-5: math.round(math.div($scheme-main-l, 5)) * 5;
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$pct-to-int: math.div($closest-5, 100%) * 100;
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$scheme-main-digits: #{$pct-to-int};
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// === STEP 1 ===
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// Register the base colors
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@include register-base-color($name, $base);
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// === STEP 2 ===
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// Generating 20 shades of the color
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// 00: 0%, 1%, 2%
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// 05: 3%, 4%, 5%, 6%, 7%
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// 10: 8%, 9%
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@if ($l-base < 3%) {
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$l-0: $l-base;
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$l-5: $l-base + 5%;
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} @else if ($l-base < 8%) {
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// $l-0: math.max($l-base - 5%, 0%);
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$l-0: $l-base - 5%;
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$l-5: $l-base;
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} @else {
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// $l-0: math.max($l-base - 10%, 0%);
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$l-0: $l-base - 10%;
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$l-5: $l-base - 5%;
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}
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$shades: ();
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@for $i from 0 through 9 {
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// if $l-base = 3%, then we get 3%, 13%, 23%, 33% etc.
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$color-l-0: math.max($l-0 + $i * 10, 0%);
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// if $l-base = 3%, then we get 8%, 18%, 28%, 38% etc.
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$color-l-5: $l-5 + $i * 10;
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$shades: map.set($shades, "#{$i}0", $color-l-0);
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$shades: map.set($shades, "#{$i}5", $color-l-5);
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@include register-var($name, $color-l-0, "", "-#{$i}0-l");
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@include register-var($name, $color-l-5, "", "-#{$i}5-l");
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@if $color-l-0 == $l {
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$base-digits: "#{$i}0";
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} @else if $color-l-5 == $l {
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$base-digits: "#{$i}5";
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}
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}
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$shades: map.set($shades, "100", 100%);
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@include register-var($name, 100%, "", "-100-l");
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// === STEP 3 ===
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// Find accessible color combinations
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$combos: ();
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@each $digits-bg, $bg-l in $shades {
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$background: hsl($h, $s, $bg-l);
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$bg-lum: fn.bulmaColorLuminance($background);
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$bg-is-light: $bg-lum > 0.55;
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$candidates: ();
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$found: false;
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// If the background color is the base color
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@if $bg-l == $l {
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$base-digits: $digits-bg;
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// Even if the base color as a background
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// doesn't have an appropriate foreground,
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// we still add to the list of "valid" contrast combos for now.
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@if $bg-is-light {
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$combos: map.set($combos, $base-digits, "10");
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} @else {
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$combos: map.set($combos, $base-digits, "100");
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}
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}
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// We capture all contrast ratios for any given background
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// using all foreground options
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$current-best-digits: "00";
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$current-best-ratio: 0;
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@each $digits-fg, $fg-l in $shades {
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$foreground: hsl($h, $s, $fg-l);
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$ratio: 0;
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$is-light-fg: false;
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// Source: https://www.w3.org/TR/WCAG20-TECHS/G17.html
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$fg-lum: fn.bulmaColorLuminance($foreground);
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@if (lightness($foreground) > lightness($background)) {
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$is-light-fg: true;
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$ratio: math.div(($fg-lum + 0.05), ($bg-lum + 0.05));
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} @else {
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$ratio: math.div(($bg-lum + 0.05), ($fg-lum + 0.05));
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}
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@if $ratio > 7 {
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$candidates: list.append(
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$candidates,
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fn.bulmaStringToNumber($digits-fg)
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);
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@if ($is-light-fg) {
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@if (not $found) {
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// Store the background/foreground combination
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$combos: map.set($combos, $digits-bg, $digits-fg);
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$current-best-digits: $digits-fg;
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$current-best-ratio: $ratio;
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$found: true;
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}
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} @else {
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$combos: map.set($combos, $digits-bg, $digits-fg);
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$current-best-digits: $digits-fg;
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$current-best-ratio: $ratio;
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}
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}
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}
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// We haven't found a decent ratio
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@each $digits-fg, $fg-l in $shades {
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@if (map.has-key($combos, $digits-bg) == false) {
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@if ($bg-is-light) {
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// Light background so we set a dark foreground
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$combos: map.set($combos, $digits-bg, "00");
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} @else {
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// Dark background so we set a light foreground
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$combos: map.set($combos, $digits-bg, "100");
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}
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}
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}
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}
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// The output needs to be:
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// --bulma-primary-invert-l: var(--bulma-primary-100-l);
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@each $bg, $fg in $combos {
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// Just using this loop to register all 20 digits
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$bg-l: getVar($name, "", "-#{$bg}-l");
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@include register-var("#{$name}-#{$bg}", buildHslaString($name, $bg-l));
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// Register the lightness
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@include register-var(
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$name,
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getVar($name, "", "-#{$fg}-l"),
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"",
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"-#{$bg}-invert-l"
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);
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// Resiter the color using that lightness
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$bg-invert-l: getVar($name, "", "-#{$bg}-invert-l");
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@include register-var(
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"#{$name}-#{$bg}-invert",
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buildHslaString($name, $bg-invert-l)
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);
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}
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// If an invert color is provided by the user
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@if $invert {
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@include register-var($name, lightness($invert), "", "-invert-l");
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@include register-var("#{$name}-invert", $invert);
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} @else {
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$base-invert-l-digits: map.get($combos, $base-digits);
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@include register-var(
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$name,
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getVar($name, "", "-#{$base-invert-l-digits}-l"),
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"",
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"-invert-l"
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);
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$base-invert-l: getVar($name, "", "-invert-l");
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@include register-var(
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"#{$name}-invert",
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buildHslaString($name, $base-invert-l)
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);
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}
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// Good color on light background (90% lightness)
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@if $light and $dark {
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@include register-var($name, lightness($light), "", "-light-l");
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@include register-var($name, lightness($light), "", "-dark-invert-l");
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@include register-var("#{$name}-light", $light);
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@include register-var("#{$name}-dark-invert", $light);
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@include register-var($name, lightness($dark), "", "-dark-l");
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@include register-var($name, lightness($dark), "", "-light-invert-l");
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@include register-var("#{$name}-dark", $dark);
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@include register-var("#{$name}-light-invert", $dark);
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} @else {
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@include register-var($name, getVar($name, "", "-90-l"), "", "-light-l");
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$light-l: getVar($name, "", "-light-l");
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@include register-var("#{$name}-light", buildHslaString($name, $light-l));
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$light-invert-l-digits: map.get($combos, "90");
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@include register-var(
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$name,
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getVar($name, "", "-#{$light-invert-l-digits}-l"),
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"",
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"-light-invert-l"
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);
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$light-invert-l: getVar($name, "", "-light-invert-l");
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@include register-var(
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"#{$name}-light-invert",
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buildHslaString($name, $light-invert-l)
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);
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// Good color on dark background (10% lightness)
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@include register-var($name, getVar($name, "", "-10-l"), "", "-dark-l");
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$dark-l: getVar($name, "", "-dark-l");
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@include register-var("#{$name}-dark", buildHslaString($name, $dark-l));
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$dark-invert-l-digits: map.get($combos, "10");
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@include register-var(
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$name,
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getVar($name, "", "-#{$dark-invert-l-digits}-l"),
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"",
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"-dark-invert-l"
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);
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$dark-invert-l: getVar($name, "", "-dark-invert-l");
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@include register-var(
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"#{$name}-dark-invert",
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buildHslaString($name, $dark-invert-l)
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);
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// Soft and Bold colors
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$soft-l: getVar("soft-l");
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$soft-invert-l: getVar("soft-invert-l");
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$bold-l: getVar("bold-l");
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$bold-invert-l: getVar("bold-invert-l");
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@include register-var("#{$name}-soft", buildHslaString($name, $soft-l));
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@include register-var("#{$name}-bold", buildHslaString($name, $bold-l));
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@include register-var(
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"#{$name}-soft-invert",
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buildHslaString($name, $soft-invert-l)
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);
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@include register-var(
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"#{$name}-bold-invert",
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buildHslaString($name, $bold-invert-l)
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);
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}
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}
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@mixin bulma-theme($name) {
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[data-#{iv.$class-prefix}theme="#{$name}"],
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.#{iv.$class-prefix}theme-#{$name} {
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@content;
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}
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}
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@mixin system-theme($name) {
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@media (prefers-color-scheme: #{$name}) {
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:root {
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@content;
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}
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}
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}
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