276 lines
8.2 KiB
SCSS
276 lines
8.2 KiB
SCSS
// Foundation for Sites by ZURB
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// foundation.zurb.com
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// Licensed under MIT Open Source
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////
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/// @group breakpoints
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////
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// scss-lint:disable ZeroUnit
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/// A list of named breakpoints. You can use these with the `breakpoint()` mixin to quickly create media queries.
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/// @type Map
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$breakpoints: (
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small: 0,
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medium: 640px,
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large: 1024px,
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xlarge: 1200px,
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xxlarge: 1440px,
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) !default;
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$-zf-zero-breakpoint: small !default;
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@if nth(map-values($breakpoints), 1) != 0 {
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@error 'Your smallest breakpoint (defined in $breakpoints) must be set to "0".';
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}
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@else {
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$-zf-zero-breakpoint: nth(map-keys($breakpoints), 1);
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}
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/// All of the names in this list will be output as classes in your CSS, like `.small-12`, `.medium-6`, and so on. Each value in this list must also be in the `$breakpoints` map.
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/// @type List
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$breakpoint-classes: (small medium large) !default;
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/// Generates a media query string matching the input value. Refer to the documentation for the `breakpoint()` mixin to see what the possible inputs are.
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///
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/// @param {Keyword|Number} $val [small] - Breakpoint name, or px, rem, or em value to process.
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@function breakpoint($val: $-zf-zero-breakpoint) {
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// Size or keyword
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$bp: nth($val, 1);
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// Value for max-width media queries
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$bp-max: 0;
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// Direction of media query (up, down, or only)
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$dir: if(length($val) > 1, nth($val, 2), up);
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// Eventual output
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$str: '';
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// Is it a named media query?
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$named: false;
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// Orientation media queries have a unique syntax
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@if $bp == 'landscape' or $bp == 'portrait' {
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@return '(orientation: #{$bp})';
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}
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@else if $bp == 'retina' {
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@return '(-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi)';
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}
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// Try to pull a named breakpoint out of the $breakpoints map
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@if type-of($bp) == 'string' {
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@if map-has-key($breakpoints, $bp) {
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@if $dir == 'only' or $dir == 'down' {
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$bp-max: -zf-map-next($breakpoints, $bp);
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}
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$bp: map-get($breakpoints, $bp);
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$named: true;
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}
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@else {
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$bp: 0;
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@warn 'breakpoint(): "#{$val}" is not defined in your $breakpoints setting.';
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}
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}
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// Convert any pixel, rem, or unitless value to em
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$bp: -zf-bp-to-em($bp);
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@if $bp-max {
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$bp-max: -zf-bp-to-em($bp-max) - (1/16);
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}
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// Conditions to skip media query creation
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// - It's a named breakpoint that resolved to "0 down" or "0 up"
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// - It's a numeric breakpoint that resolved to "0 " + anything
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@if $bp > 0em or $dir == 'only' or $dir == 'down' {
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// `only` ranges use the format `(min-width: n) and (max-width: n)`
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@if $dir == 'only' {
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// Only named media queries can have an "only" range
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@if $named == true {
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// Only use "min-width" if the floor is greater than 0
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@if $bp > 0em {
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$str: $str + '(min-width: #{$bp})';
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// Only add "and" to the media query if there's a ceiling
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@if $bp-max != null {
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$str: $str + ' and ';
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}
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}
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// Only use "max-width" if there's a ceiling
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@if $bp-max != null {
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$str: $str + '(max-width: #{$bp-max})';
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}
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}
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@else {
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@warn 'breakpoint(): Only named media queries can have an `only` range.';
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}
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}
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// `down` ranges use the format `(max-width: n)`
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@else if $dir == 'down' {
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$max: if($named, $bp-max, $bp);
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// Skip media query creation if input value is exactly "0 down",
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// unless the function was called as "small down", in which case it's just "small only"
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@if $named or $bp > 0em {
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@if $max != null {
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$str: $str + '(max-width: #{$max})';
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}
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}
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}
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// `up` ranges use the format `(min-width: n)`
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@else if $bp > 0em {
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$str: $str + '(min-width: #{$bp})';
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}
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}
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@return $str;
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}
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/// Wraps a media query around the content you put inside the mixin. This mixin accepts a number of values:
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/// - If a string is passed, the mixin will look for it in the `$breakpoints` map, and use a media query there.
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/// - If a pixel value is passed, it will be converted to an em value using `$global-font-size` as the base.
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/// - If a rem value is passed, the unit will be changed to em.
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/// - If an em value is passed, the value will be used as-is.
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///
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/// @param {Keyword|Number} $value - Breakpoint name, or px, rem, or em value to process.
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///
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/// @output If the breakpoint is "0px and larger", outputs the content as-is. Otherwise, outputs the content wrapped in a media query.
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@mixin breakpoint($value) {
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$str: breakpoint($value);
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// If $str is still an empty string, no media query is needed
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@if $str == '' {
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@content;
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}
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// Otherwise, wrap the content in a media query
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@else {
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@media screen and #{$str} {
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@content;
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}
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}
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}
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/// Convers the breakpoints map to a URL-encoded string, like this: `key1=value1&key2=value2`. The value is then dropped into the CSS for a special `<meta>` tag, which is read by the Foundation JavaScript. This is how we transfer values from Sass to JavaScript, so they can be defined in one place.
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/// @access private
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///
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/// @param {Map} $map - Map to convert.
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///
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/// @returns {String} A string containing the map's contents.
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@function -zf-bp-serialize($map) {
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$str: '';
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@each $key, $value in $map {
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$str: $str + $key + '=' + -zf-bp-to-em($value) + '&';
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}
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$str: str-slice($str, 1, -2);
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@return $str;
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}
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/// Find the next key in a map.
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/// @access private
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///
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/// @param {Map} $map - Map to traverse.
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/// @param {Mixed} $key - Key to use as a starting point.
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///
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/// @returns {Mixed} The value for the key after `$key`, if `$key` was found. If `$key` was not found, or `$key` was the last value in the map, returns `null`.
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@function -zf-map-next($map, $key) {
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// Store the values of the map as a list, so we can access them with nth
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$values: map-values($map);
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// Ghetto for loop
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$i: 1;
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$found: false;
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@each $val in map-keys($map) {
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@if $found == false {
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@if ($key == $val) {
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$found: true;
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}
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$i: $i + 1;
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}
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}
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// If the key doesn't exist, or it's the last key in the map, return null
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@if $i > length($map) {
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@return null;
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}
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// Otherwise, return the value
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@else {
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@return nth($values, $i);
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}
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}
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/// Get a value for a breakpoint from a responsive config map. If the config map has the key `$value`, the exact breakpoint value is returned. If the config map does *not* have the breakpoint, the value matching the next lowest breakpoint in the config map is returned.
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/// @access private
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///
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/// @param {Map} $map - Input config map.
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/// @param {Keyword} $value - Breakpoint name to use.
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///
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/// @return {Mixed} The corresponding breakpoint value.
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@function -zf-get-bp-val($map, $value) {
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// Check if the breakpoint name exists globally
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@if not map-has-key($breakpoints, $value) {
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@return null;
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}
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// Check if the breakpoint name exists in the local config map
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@else if map-has-key($map, $value) {
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// If it does, just return the value
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@return map-get($map, $value);
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}
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// Otherwise, find the next lowest breakpoint and return that value
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@else {
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$anchor: null;
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$found: false;
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@each $key, $val in $breakpoints {
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@if not $found {
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@if map-has-key($map, $key) {
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$anchor: $key;
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}
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@if $key == $value {
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$found: true;
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}
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}
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}
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@return map-get($map, $anchor);
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}
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}
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// Legacy breakpoint variables
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// These will be removed in 6.3
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$small-up: null;
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$small-only: null;
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$medium-up: null;
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$medium-only: null;
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$large-up: null;
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$large-only: null;
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$xlarge-up: null;
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$xlarge-only: null;
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$xxlarge-up: null;
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$xxlarge-only: null;
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@if map-has-key($breakpoints, small) {
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$small-up: screen;
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$small-only: unquote('screen and #{breakpoint(small only)}');
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}
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@if map-has-key($breakpoints, medium) {
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$medium-up: unquote('screen and #{breakpoint(medium)}');
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$medium-only: unquote('screen and #{breakpoint(medium only)}');
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}
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@if map-has-key($breakpoints, large) {
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$large-up: unquote('screen and #{breakpoint(large)}');
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$large-only: unquote('screen and #{breakpoint(large only)}');
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}
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@if map-has-key($breakpoints, xlarge) {
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$xlarge-up: unquote('screen and #{breakpoint(xlarge)}');
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$xlarge-only: unquote('screen and #{breakpoint(xlarge only)}');
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}
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@if map-has-key($breakpoints, xxlarge) {
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$xxlarge-up: unquote('screen and #{breakpoint(xxlarge)}');
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}
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