bootstrap-less-port/less/mixins/_breakpoints.less

A Less port of Bootstrap v4

// Breakpoint viewport sizes and media queries.
//
// Breakpoints are defined as a map of (name: minimum width), order from small to large:
//
//    (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px)
//
// The map defined in the `@grid-breakpoints` global variable is used as the `@breakpoints` argument by default.

@plugin "../plugins/breakpoints";

// Name of the next breakpoint, or null for the last breakpoint.
//
//    >> breakpoint-next(sm)
//    md
//    >> breakpoint-next(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    md
//    >> breakpoint-next(sm, @breakpoint-names: (xs sm md lg xl))
//    md
//@function breakpoint-next($name, $breakpoints: $grid-breakpoints, $breakpoint-names: map-keys($breakpoints)) {
//  $n: index($breakpoint-names, $name);
//  @return if($n < length($breakpoint-names), nth($breakpoint-names, $n + 1), null);
//}

// Minimum breakpoint width. Null for the smallest (first) breakpoint.
//
//    >> breakpoint-min(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    576px
//@function breakpoint-min($name, $breakpoints: $grid-breakpoints) {
//  $min: map-get($breakpoints, $name);
//  @return if($min != 0, $min, null);
//}

// Maximum breakpoint width. Null for the largest (last) breakpoint.
// The maximum value is calculated as the minimum of the next one less 0.02px
// to work around the limitations of `min-` and `max-` prefixes and viewports with fractional widths.
// See https://www.w3.org/TR/mediaqueries-4/#mq-min-max
// Uses 0.02px rather than 0.01px to work around a current rounding bug in Safari.
// See https://bugs.webkit.org/show_bug.cgi?id=178261
//
//    >> breakpoint-max(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    767.98px
//@function breakpoint-max($name, $breakpoints: $grid-breakpoints) {
//  $next: breakpoint-next($name, $breakpoints);
//  @return if($next, breakpoint-min($next, $breakpoints) - 0.01px, null);
//}

// Returns a blank string if smallest breakpoint, otherwise returns the name with a dash in front.
// Useful for making responsive utilities.
//
//    >> breakpoint-infix(xs, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    ""  (Returns a blank string)
//    >> breakpoint-infix(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
//    "-sm"
//@function breakpoint-infix($name, $breakpoints: $grid-breakpoints) {
//  @return if(breakpoint-min($name, $breakpoints) == null, "", "-#{$name}");
//}

// Media of at least the minimum breakpoint width. No query for the smallest breakpoint.
// Makes the @content apply to the given breakpoint and wider.
//@mixin media-breakpoint-up($name, $breakpoints: $grid-breakpoints) {
//  $min: breakpoint-min($name, $breakpoints);
//  @if $min {
//    @media (min-width: $min) {
//      @content;
//    }
//  } @else {
//    @content;
//  }
//}
#media-breakpoint-up(@name, @content, @breakpoints: @grid-breakpoints) {
	@min: breakpoint-min(@name, @breakpoints);

	& when not (@min = ~"") {
		@media (min-width: @min) {
			@content();
		}
	}
	& when (@min = ~"") {
		@content();
	}
}

// Media of at most the maximum breakpoint width. No query for the largest breakpoint.
// Makes the @content apply to the given breakpoint and narrower.
//@mixin media-breakpoint-down($name, $breakpoints: $grid-breakpoints) {
//  $max: breakpoint-max($name, $breakpoints);
//  @if $max {
//    @media (max-width: $max) {
//      @content;
//    }
//  } @else {
//    @content;
//  }
//}
#media-breakpoint-down(@name, @content, @breakpoints: @grid-breakpoints) {
	@max: breakpoint-max(@name, @breakpoints);

	& when not (@max = ~"") {
		@media (max-width: @max) {
			@content();
		}
	}
	& when (@max = ~"") {
		@content();
	}
}

// Media that spans multiple breakpoint widths.
// Makes the @content apply between the min and max breakpoints
//@mixin media-breakpoint-between($lower, $upper, $breakpoints: $grid-breakpoints) {
//  $min: breakpoint-min($lower, $breakpoints);
//  $max: breakpoint-max($upper, $breakpoints);
//
//  @if $min != null and $max != null {
//    @media (min-width: $min) and (max-width: $max) {
//      @content;
//    }
//  } @else if $max == null {
//    @include media-breakpoint-up($lower) {
//      @content;
//    }
//  } @else if $min == null {
//    @include media-breakpoint-down($upper) {
//      @content;
//    }
//  }
//}
#media-breakpoint-between(@lower, @upper, @content, @breakpoints: @grid-breakpoints) {
	@min: breakpoint-min(@lower, @breakpoints);
	@max: breakpoint-max(@upper, @breakpoints);

	& when not (@min = ~"") and not (@max = ~"") {
		@media (min-width: @min) and (max-width: @max) {
			@content();
		}
	}
	& when not (@min = ~"") and     (@max = ~"") {
		#media-breakpoint-up(@lower, @content, @breakpoints);
	}
	& when     (@min = ~"") and not (@max = ~"") {
		#media-breakpoint-down(@upper, @content, @breakpoints);
	}
}

// Media between the breakpoint's minimum and maximum widths.
// No minimum for the smallest breakpoint, and no maximum for the largest one.
// Makes the @content apply only to the given breakpoint, not viewports any wider or narrower.
//@mixin media-breakpoint-only($name, $breakpoints: $grid-breakpoints) {
//  $min: breakpoint-min($name, $breakpoints);
//  $max: breakpoint-max($name, $breakpoints);
//
//  @if $min != null and $max != null {
//    @media (min-width: $min) and (max-width: $max) {
//      @content;
//    }
//  } @else if $max == null {
//    @include media-breakpoint-up($name) {
//      @content;
//    }
//  } @else if $min == null {
//    @include media-breakpoint-down($name) {
//      @content;
//    }
//  }
//}
#media-breakpoint-only(@name, @content, @breakpoints: @grid-breakpoints) {
	@min: breakpoint-min(@name, @breakpoints);
	@max: breakpoint-max(@name, @breakpoints);

	& when not (@min = ~"") and not (@max = ~"") {
		@media (min-width: @min) and (max-width: @max) {
			@content();
		}
	}
	& when not (@min = ~"") and     (@max = ~"") {
		#media-breakpoint-up(@name, @content, @breakpoints);
	}
	& when     (@min = ~"") and not (@max = ~"") {
		#media-breakpoint-down(@name, @content, @breakpoints);
	}
}