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

   1 @import "mediawiki.mixins";
   2 @import "mediawiki.ui/variables";
   3
   4 // Radio
   5 //
   6 // Styling radios in a way that works cross browser is a tricky problem to solve.
   7 // In MediaWiki UI put a radio and label inside a mw-ui-radio 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 radio and label matching "id" and "for" attributes, respectively.
  11 //
  12 // Markup:
  13 // <div class="mw-ui-radio">
  14 //   <input type="radio" id="kss-example-4" name="kss-example-4">
  15 //   <label for="kss-example-4">Standard radio</label>
  16 // </div>
  17 // <div class="mw-ui-radio">
  18 //   <input type="radio" id="kss-example-4-checked" name="kss-example-4" checked>
  19 //   <label for="kss-example-4-checked">Standard checked radio</label>
  20 // </div>
  21 // <div class="mw-ui-radio">
  22 //   <input type="radio" id="kss-example-4-disabled" name="kss-example-4-disabled" disabled>
  23 //   <label for="kss-example-4-disabled">Disabled radio</label>
  24 // </div>
  25 // <div class="mw-ui-radio">
  26 //   <input type="radio" id="kss-example-4-disabled-checked" name="kss-example-4-disabled" disabled checked>
  27 //   <label for="kss-example-4-disabled-checked">Disabled checked radio</label>
  28 // </div>
  29 //
  30 // Styleguide 4.
  31 .mw-ui-radio {
  32         display: inline-block;
  33         vertical-align: middle;
  34 }
  35
  36 @radioSize: 2em;
  37
  38 // We use the not selector to cancel out styling on IE 8 and below.
  39 // We also disable this styling on javascript disabled devices. This fixes the issue with
  40 // Opera Mini where checking/unchecking doesn't apply styling but potentially leaves other
  41 // more capable browsers with unstyled radio buttons.
  42 .client-js .mw-ui-radio:not(#noop) {
  43         // Position relatively so we can make use of absolute pseudo elements
  44         position: relative;
  45         line-height: @radioSize;
  46
  47         * {
  48                 // reset font sizes (see bug 72727)
  49                 font: inherit;
  50                 vertical-align: middle;
  51         }
  52
  53         input[type="radio"] {
  54                 // we hide the input element as instead we will style the label that follows
  55                 // we use opacity so that VoiceOver software can still identify it
  56                 opacity: 0;
  57                 // ensure the invisible radio takes up the required width
  58                 width: @radioSize;
  59                 height: @radioSize;
  60                 // This is needed for Firefox mobile (See bug 71750 to workaround default Firefox stylesheet)
  61                 max-width: none;
  62                 margin-right: 0.4em;
  63
  64                 // the pseudo before element of the label after the radio now looks like a radio
  65                 & + label::before {
  66                         content: '';
  67                         cursor: pointer;
  68                         .box-sizing(border-box);
  69                         position: absolute;
  70                         left: 0;
  71                         border-radius: 100%;
  72                         width: @radioSize;
  73                         height: @radioSize;
  74                         background-color: #fff;
  75                         border: 1px solid @colorGray7;
  76                         .background-image-svg('images/radio_checked.svg', 'images/radio_checked.png');
  77                         .background-size( @radioSize, @radioSize );
  78                         background-repeat: no-repeat;
  79                         background-position: center center;
  80                         background-origin: border-box;
  81                         background-size: 0 0;
  82                 }
  83
  84                 // when the input is checked, style the label pseudo before element that followed as a checked radio
  85                 &:checked + label::before {
  86                         background-size: 100% 100%;
  87                 }
  88
  89                 &:active + label::before {
  90                         background-color: @colorGray13;
  91                         border-color: @colorGray13;
  92                 }
  93
  94                 &:focus + label::before {
  95                         border-width: 2px;
  96                 }
  97
  98                 &:focus:hover + label::before,
  99                 &:hover + label::before {
 100                         border-bottom-width: 3px;
 101                 }
 102
 103                 // disabled radios have a gray background
 104                 &:disabled + label::before {
 105                         cursor: default;
 106                         background-color: @colorGray14;
 107                         border-color: @colorGray14;
 108                 }
 109
 110                 // disabled and checked radios have a white circle
 111                 &:disabled:checked + label::before {
 112                         .background-image-svg('images/radio_disabled.svg', 'images/radio_disabled.png');
 113                 }
 114         }
 115 }