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1 // Breakpoint viewport sizes and media queries.
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2 //
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3 // Breakpoints are defined as a map of (name: minimum width), order from small to large:
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4 //
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5 // (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px)
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6 //
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7 // The map defined in the `$grid-breakpoints` global variable is used as the `$breakpoints` argument by default.
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8
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9 // Name of the next breakpoint, or null for the last breakpoint.
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10 //
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11 // >> breakpoint-next(sm)
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12 // md
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13 // >> breakpoint-next(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
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14 // md
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15 // >> breakpoint-next(sm, $breakpoint-names: (xs sm md lg xl))
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16 // md
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17 @function breakpoint-next($name, $breakpoints: $grid-breakpoints, $breakpoint-names: map-keys($breakpoints)) {
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18 $n: index($breakpoint-names, $name);
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19 @return if($n < length($breakpoint-names), nth($breakpoint-names, $n + 1), null);
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20 }
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21
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22 // Minimum breakpoint width. Null for the smallest (first) breakpoint.
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23 //
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24 // >> breakpoint-min(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
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25 // 576px
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26 @function breakpoint-min($name, $breakpoints: $grid-breakpoints) {
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27 $min: map-get($breakpoints, $name);
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28 @return if($min != 0, $min, null);
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29 }
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30
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31 // Maximum breakpoint width. Null for the largest (last) breakpoint.
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32 // The maximum value is calculated as the minimum of the next one less 0.1.
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33 //
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34 // >> breakpoint-max(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
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35 // 767px
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36 @function breakpoint-max($name, $breakpoints: $grid-breakpoints) {
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37 $next: breakpoint-next($name, $breakpoints);
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38 @return if($next, breakpoint-min($next, $breakpoints) - 1px, null);
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39 }
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40
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41 // Returns a blank string if smallest breakpoint, otherwise returns the name with a dash infront.
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42 // Useful for making responsive utilities.
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43 //
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44 // >> breakpoint-infix(xs, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
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45 // "" (Returns a blank string)
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46 // >> breakpoint-infix(sm, (xs: 0, sm: 576px, md: 768px, lg: 992px, xl: 1200px))
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47 // "-sm"
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48 @function breakpoint-infix($name, $breakpoints: $grid-breakpoints) {
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49 @return if(breakpoint-min($name, $breakpoints) == null, "", "-#{$name}");
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50 }
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51
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52 // Media of at least the minimum breakpoint width. No query for the smallest breakpoint.
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53 // Makes the @content apply to the given breakpoint and wider.
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54 @mixin media-breakpoint-up($name, $breakpoints: $grid-breakpoints) {
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55 $min: breakpoint-min($name, $breakpoints);
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56 @if $min {
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57 @media (min-width: $min) {
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58 @content;
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59 }
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60 } @else {
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61 @content;
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62 }
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63 }
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64
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65 // Media of at most the maximum breakpoint width. No query for the largest breakpoint.
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66 // Makes the @content apply to the given breakpoint and narrower.
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67 @mixin media-breakpoint-down($name, $breakpoints: $grid-breakpoints) {
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68 $max: breakpoint-max($name, $breakpoints);
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69 @if $max {
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70 @media (max-width: $max) {
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71 @content;
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72 }
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73 } @else {
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74 @content;
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75 }
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76 }
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77
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78 // Media that spans multiple breakpoint widths.
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79 // Makes the @content apply between the min and max breakpoints
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80 @mixin media-breakpoint-between($lower, $upper, $breakpoints: $grid-breakpoints) {
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81 $min: breakpoint-min($lower, $breakpoints);
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82 $max: breakpoint-max($upper, $breakpoints);
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83
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84 @media (min-width: $min) and (max-width: $max) {
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85 @content;
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86 }
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87 }
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88
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89 // Media between the breakpoint's minimum and maximum widths.
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90 // No minimum for the smallest breakpoint, and no maximum for the largest one.
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91 // Makes the @content apply only to the given breakpoint, not viewports any wider or narrower.
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92 @mixin media-breakpoint-only($name, $breakpoints: $grid-breakpoints) {
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93 $min: breakpoint-min($name, $breakpoints);
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94 $max: breakpoint-max($name, $breakpoints);
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95
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96 @if $min != null and $max != null {
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97 @media (min-width: $min) and (max-width: $max) {
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98 @content;
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99 }
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100 } @else if $max == null {
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101 @include media-breakpoint-up($name)
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102 } @else if $min == null {
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103 @include media-breakpoint-down($name)
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104 }
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105 }
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