Created
March 1, 2015 05:05
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A mixin for adding borders that don't effect the box model, meaning that if a designer asks for 10px padding around a box and there is also a 1px border, you don't have to make your padding 9px to compensate. It helps you to avoid magic numbers.
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| @mixin magic-border($widths, $color, $extra-box-shadow: false) { | |
| $shadow: null; | |
| @if length($widths) == 1 { | |
| $shadow: 'inset 0 0 0 #{$widths} #{$color}'; | |
| } | |
| @if length($widths) == 2 { | |
| $shadow: 'inset 0 #{nth($widths,1)} 0 0 #{$color}, inset -#{nth($widths,2)} 0 0 0 #{$color}, inset 0 -#{nth($widths,1)} 0 0 #{$color}, inset #{nth($widths,2)} 0 0 0 #{$color}'; | |
| } | |
| @if length($widths) == 3 { | |
| $shadow: 'inset 0 #{nth($widths,1)} 0 0 #{$color}, inset -#{nth($widths,2)} 0 0 0 #{$color}, inset 0 -#{nth($widths,3)} 0 0 #{$color}, inset #{nth($widths,2)} 0 0 0 #{$color}'; | |
| } | |
| @if length($widths) == 4 { | |
| $shadow: 'inset 0 #{nth($widths,1)} 0 0 #{$color}, inset -#{nth($widths,2)} 0 0 0 #{$color}, inset 0 -#{nth($widths,3)} 0 0 #{$color}, inset #{nth($widths,4)} 0 0 0 #{$color}'; | |
| } | |
| @if $extra-box-shadow != false { | |
| @if length($extra-box-shadow) != 1 { | |
| @error "Extra box shadows must be wrapped in quotes to allow for more than one."; | |
| } | |
| $shadow: append(unquote($shadow), unquote($extra-box-shadow), comma); | |
| } @else { | |
| $shadow: unquote($shadow); | |
| } | |
| box-shadow: $shadow; | |
| } |
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