}
}
+// Colors
+@function to-rgb($value) {
+ @return red($value), green($value), blue($value);
+}
+
+@function rgba-css-var($identifier, $target) {
+ @return rgba(var(--#{$variable-prefix}#{$identifier}-rgb), var(--#{$variable-prefix}#{$target}-opacity));
+}
+
+// stylelint-disable scss/dollar-variable-pattern
+@function map-loop($map, $func, $args...) {
+ $_map: ();
+
+ @each $key, $value in $map {
+ // allow to pass the $key and $value of the map as an function argument
+ $_args: ();
+ @each $arg in $args {
+ $_args: append($_args, if($arg == "$key", $key, if($arg == "$value", $value, $arg)));
+ }
+
+ $_map: map-merge($_map, ($key: call(get-function($func), $_args...)));
+ }
+
+ @return $_map;
+}
+// stylelint-enable scss/dollar-variable-pattern
+
+@function varify($list) {
+ $result: null;
+ @each $entry in $list {
+ $result: append($result, var(--#{$variable-prefix}#{$entry}), space);
+ }
+ @return $result;
+}
+
// Internal Bootstrap function to turn maps into its negative variant.
// It prefixes the keys with `n` and makes the value negative.
@function negativify-map($map) {
--#{$variable-prefix}#{$color}: #{$value};
}
+ @each $color, $value in $theme-colors-rgb {
+ --#{$variable-prefix}#{$color}-rgb: #{$value};
+ }
+
+ --#{$variable-prefix}white-rgb: #{to-rgb($white)};
+ --#{$variable-prefix}black-rgb: #{to-rgb($black)};
+ --#{$variable-prefix}body-rgb: #{to-rgb($body-color)};
+
// Use `inspect` for lists so that quoted items keep the quotes.
// See https://github.com/sass/sass/issues/2383#issuecomment-336349172
--#{$variable-prefix}font-sans-serif: #{inspect($font-family-sans-serif)};
"color": (
property: color,
class: text,
+ local-vars: (
+ "text-opacity": 1
+ ),
values: map-merge(
- $theme-colors,
+ $utilities-text-colors,
(
- "white": $white,
- "body": $body-color,
"muted": $text-muted,
- "black-50": rgba($black, .5),
- "white-50": rgba($white, .5),
+ "black-50": rgba($black, .5), // deprecated
+ "white-50": rgba($white, .5), // deprecated
"reset": inherit,
)
)
),
+ "text-opacity": (
+ css-var: true,
+ class: text-opacity,
+ values: (
+ 25: .25,
+ 50: .5,
+ 75: .75,
+ 100: 1
+ )
+ ),
// scss-docs-end utils-color
// scss-docs-start utils-bg-color
"background-color": (
property: background-color,
class: bg,
+ local-vars: (
+ "bg-opacity": 1
+ ),
values: map-merge(
- $theme-colors,
+ $utilities-bg-colors,
(
- "body": $body-bg,
- "white": $white,
"transparent": transparent
)
)
),
+ "bg-opacity": (
+ css-var: true,
+ class: bg-opacity,
+ values: (
+ 10: .1,
+ 25: .25,
+ 50: .5,
+ 75: .75,
+ 100: 1
+ )
+ ),
// scss-docs-end utils-bg-color
"gradient": (
property: background-image,
) !default;
// scss-docs-end theme-colors-map
+// scss-docs-start theme-colors-rgb
+$theme-colors-rgb: map-loop($theme-colors, to-rgb, "$value") !default;
+// scss-docs-end theme-colors-rgb
+
// The contrast ratio to reach against white, to determine if color changes from "light" to "dark". Acceptable values for WCAG 2.0 are 3, 4.5 and 7.
// See https://www.w3.org/TR/WCAG20/#visual-audio-contrast-contrast
$min-contrast-ratio: 4.5 !default;
$body-color: $gray-900 !default;
$body-text-align: null !default;
+// Utilities maps
+//
+// Extends the default `$theme-colors` maps to help create our utilities.
+
+// scss-docs-start utilities-colors
+$utilities-colors: map-merge(
+ $theme-colors-rgb,
+ (
+ "black": to-rgb($black),
+ "white": to-rgb($white),
+ "body": to-rgb($body-color)
+ )
+) !default;
+// scss-docs-end utilities-colors
+
+// scss-docs-start utilities-text-colors
+$utilities-text-colors: map-loop($utilities-colors, rgba-css-var, "$key", "text") !default;
+// scss-docs-end utilities-text-colors
+
+// scss-docs-start utilities-bg-colors
+$utilities-bg-colors: map-loop($utilities-colors, rgba-css-var, "$key", "bg") !default;
+// scss-docs-end utilities-bg-colors
// Links
//
}
}
+ $is-css-var: map-get($utility, css-var);
+ $is-local-vars: map-get($utility, local-vars);
$is-rtl: map-get($utility, rtl);
@if $value != null {
@if $is-rtl == false {
/* rtl:begin:remove */
}
- .#{$property-class + $infix + $property-class-modifier} {
- @each $property in $properties {
- #{$property}: $value if($enable-important-utilities, !important, null);
+
+ @if $is-css-var {
+ .#{$property-class + $infix + $property-class-modifier} {
+ --#{$variable-prefix}#{$property-class}: #{$value};
}
- }
- @each $pseudo in $state {
- .#{$property-class + $infix + $property-class-modifier}-#{$pseudo}:#{$pseudo} {
+ @each $pseudo in $state {
+ .#{$property-class + $infix + $property-class-modifier}-#{$pseudo}:#{$pseudo} {
+ --#{$variable-prefix}#{$property-class}: #{$value};
+ }
+ }
+ } @else {
+ .#{$property-class + $infix + $property-class-modifier} {
@each $property in $properties {
+ @if $is-local-vars {
+ @each $local-var, $value in $is-local-vars {
+ --#{$variable-prefix}#{$local-var}: #{$value};
+ }
+ }
#{$property}: $value if($enable-important-utilities, !important, null);
}
}
+
+ @each $pseudo in $state {
+ .#{$property-class + $infix + $property-class-modifier}-#{$pseudo}:#{$pseudo} {
+ @each $property in $properties {
+ #{$property}: $value if($enable-important-utilities, !important, null);
+ }
+ }
+ }
}
+
@if $is-rtl == false {
/* rtl:end:remove */
}
{{< /colors.inline >}}
{{< /markdown >}}
+## Opacity
+
+<small class="d-inline-flex px-2 py-1 font-monospace text-muted border rounded-3">Added in v5.1.0</small>
+
+As of v5.1.0, `background-color` utilities are generated with Sass using CSS variables. This allows for real-time color changes without compilation and dynamic alpha transparency changes.
+
+### How it works
+
+Consider our default `.bg-success` utility.
+
+```css
+.bg-success {
+ --bs-bg-opacity: 1;
+ background-color: rgba(var(--bs-success-rgb), var(--bs-bg-opacity)) !important;
+}
+```
+
+We use an RGB version of our `--bs-succes` (with the value of `25, 135, 84`) CSS variable and attached a second CSS variable, `--bs-bg-opacity`, for the alpha transparency (with no default value, but a fallback of `1`). That means anytime you use `.bg-success` now, your computed `color` value is `rgba(25, 135, 84, 1)`.
+
+### Example
+
+To change that opacity, override `--bs-bg-opacity` via custom styles or inline styles.
+
+{{< example >}}
+<div class="bg-success p-2 text-white">This is default success background</div>
+<div class="bg-success p-2" style="--bs-bg-opacity: .5;">This is 50% opacity success background</div>
+{{< /example >}}
+
+Or, choose from any of the `.bg-opacity` utilities:
+
+{{< example >}}
+<div class="bg-success p-2 text-white">This is default success background</div>
+<div class="bg-success p-2 text-white bg-opacity-75">This is 75% opacity success background</div>
+<div class="bg-success p-2 text-dark bg-opacity-50">This is 50% opacity success background</div>
+<div class="bg-success p-2 text-dark bg-opacity-25">This is 25% opacity success background</div>
+<div class="bg-success p-2 text-dark bg-opacity-10">This is 10% opacity success background</div>
+{{< /example >}}
+
## Sass
In addition to the following Sass functionality, consider reading about our included [CSS custom properties]({{< docsref "/customize/css-variables" >}}) (aka CSS variables) for colors and more.
{{< scss-docs name="gray-colors-map" file="scss/_variables.scss" >}}
+RGB colors are generated from a separate Sass map:
+
+{{< scss-docs name="theme-colors-rgb" file="scss/_variables.scss" >}}
+
+And background color opacities build on that with their own map that's consumed by the utilities API:
+
+{{< scss-docs name="utilities-bg-colors" file="scss/_variables.scss" >}}
+
### Mixins
**No mixins are used to generate our background utilities**, but we do have some additional mixins for other situations where you'd like to create your own gradients.
<p class="text-white-50 bg-dark">.text-white-50</p>
{{< /example >}}
+{{< callout warning >}}
+**Deprecation:** With the addition of `.text-opacity-*` utilities and CSS variables for text utilities, `.text-black-50` and `.text-white-50` are deprecated as of v5.1.0. They'll be removed in v6.0.0.
+{{< /callout >}}
+
{{< callout info >}}
{{< partial "callout-warning-color-assistive-technologies.md" >}}
{{< /callout >}}
+## Opacity
+
+<small class="d-inline-flex px-2 py-1 font-monospace text-muted border rounded-3">Added in v5.1.0</small>
+
+As of v5.1.0, text color utilities are generated with Sass using CSS variables. This allows for real-time color changes without compilation and dynamic alpha transparency changes.
+
+### How it works
+
+Consider our default `.text-primary` utility.
+
+```css
+.text-primary {
+ --bs-text-opacity: 1;
+ color: rgba(var(--bs-primary-rgb), var(--bs-text-opacity)) !important;
+}
+```
+
+We use an RGB version of our `--bs-primary` (with the value of `13, 110, 253`) CSS variable and attached a second CSS variable, `--bs-text-opacity`, for the alpha transparency (with no default value, but a fallback of `1`). That means anytime you use `.text-primary` now, your computed `color` value is `rgba(13, 110, 253, 1)`.
+
+### Example
+
+To change that opacity, override `--bs-text-opacity` via custom styles or inline styles.
+
+{{< example >}}
+<div class="text-primary">This is default primary text</div>
+<div class="text-primary" style="--bs-text-opacity: .5;">This is 50% opacity primary text</div>
+{{< /example >}}
+
+Or, choose from any of the `.text-opacity` utilities:
+
+{{< example >}}
+<div class="text-primary">This is default primary text</div>
+<div class="text-primary text-opacity-75">This is 75% opacity primary text</div>
+<div class="text-primary text-opacity-50">This is 50% opacity primary text</div>
+<div class="text-primary text-opacity-25">This is 25% opacity primary text</div>
+{{< /example >}}
+
## Specificity
Sometimes contextual classes cannot be applied due to the specificity of another selector. In some cases, a sufficient workaround is to wrap your element's content in a `<div>` or more semantic element with the desired class.
{{< scss-docs name="gray-colors-map" file="scss/_variables.scss" >}}
+RGB colors are generated from a separate Sass map:
+
+{{< scss-docs name="theme-colors-rgb" file="scss/_variables.scss" >}}
+
+And color opacities build on that with their own map that's consumed by the utilities API:
+
+{{< scss-docs name="utilities-text-colors" file="scss/_variables.scss" >}}
+
### Utilities API
Color utilities are declared in our utilities API in `scss/_utilities.scss`. [Learn how to use the utilities API.]({{< docsref "/utilities/api#using-the-api" >}})
projects / thirdparty / bootstrap.git / commitdiff
