resources/src/mediawiki.ui/components/checkbox.less

   1 @import "mediawiki.mixins";
   2 @import "mediawiki.ui/variables";
   3
   4 // Checkbox
   5 //
   6 // Styling checkboxes in a way that works cross browser is a tricky problem to solve.
   7 // In MediaWiki UI put a checkbox and label inside a mw-ui-checkbox div.
   8 // This renders in all browsers except IE6-8 which do not support the :checked selector;
   9 // these are kept backwards-compatible using the :not(#noop) selector.
  10 // You should give the checkbox and label matching "id" and "for" attributes, respectively.
  11 //
  12 // Markup:
  13 // <div class="mw-ui-checkbox">
  14 //   <input type="checkbox" id="kss-example-5"><label for="kss-example-5">Standard checkbox</label>
  15 // </div>
  16 // <div class="mw-ui-checkbox">
  17 //   <input type="checkbox" id="kss-example-5-checked" checked><label for="kss-example-5-checked">Standard checked checkbox</label>
  18 // </div>
  19 // <div class="mw-ui-checkbox">
  20 //   <input type="checkbox" id="kss-example-5-disabled" disabled><label for="kss-example-5-disabled">Disabled checkbox</label>
  21 // </div>
  22 // <div class="mw-ui-checkbox">
  23 //   <input type="checkbox" id="kss-example-5-disabled-checked" disabled checked><label for="kss-example-5-disabled-checked">Disabled checked checkbox</label>
  24 // </div>
  25 //
  26 // Styleguide 5.
  27 .mw-ui-checkbox {
  28         display: inline-block;
  29         vertical-align: middle;
  30 }
  31
  32 @checkboxSize: 1.6em;
  33 @focusBottomBorderSize: 0.2em;
  34
  35 // We use the not selector to cancel out styling on IE 8 and below
  36 .mw-ui-checkbox:not(#noop) {
  37         // Position relatively so we can make use of absolute pseudo elements
  38         position: relative;
  39         line-height: @checkboxSize;
  40
  41         * {
  42                 // reset font sizes (see bug 72727)
  43                 font: inherit;
  44                 vertical-align: middle;
  45         }
  46
  47         input[type="checkbox"] {
  48                 // we hide the input element as instead we will style the label that follows
  49                 // we use opacity so that VoiceOver software can still identify it
  50                 opacity: 0;
  51                 // ensure the invisible checkbox takes up the required width
  52                 width: @checkboxSize;
  53                 height: @checkboxSize;
  54                 // This is needed for Firefox mobile (See bug 71750 to workaround default Firefox stylesheet)
  55                 max-width: none;
  56                 margin-right: .4em;
  57
  58                 // the pseudo before element of the label after the checkbox now looks like a checkbox
  59                 & + label::before {
  60                         content: '';
  61                         cursor: pointer;
  62                         position: absolute;
  63                         left: 0;
  64                         border-radius: @borderRadius;
  65                         width: @checkboxSize;
  66                         height: @checkboxSize;
  67                         background-color: #fff;
  68                         border: 1px solid grey;
  69                 }
  70
  71                 // when the input is checked, style the label pseudo before element that followed as a checked checkbox
  72                 &:checked + label::before {
  73                         .background-image-svg('images/checked.svg', 'images/checked.png');
  74                         .background-size( @checkboxSize, @checkboxSize );
  75                         background-repeat: no-repeat;
  76                         background-position: center top;
  77                 }
  78
  79                 &:active + label::before,
  80                 &:focus + label::before {
  81                         box-shadow: inset 0 -@focusBottomBorderSize 0 0 lightgrey;
  82                 }
  83
  84                 // disabled checked boxes have a gray background
  85                 &:disabled + label::before {
  86                         cursor: default;
  87                         background-color: lightgrey;
  88                 }
  89         }
  90 }