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
  34 // We use the not selector to cancel out styling on IE 8 and below
  35 .mw-ui-checkbox:not(#noop) {
  36         // Position relatively so we can make use of absolute pseudo elements
  37         position: relative;
  38         line-height: @checkboxSize;
  39
  40         * {
  41                 vertical-align: middle;
  42         }
  43
  44         input[type="checkbox"] {
  45                 // we hide the input element as instead we will style the label that follows
  46                 // we use opacity so that VoiceOver software can still identify it
  47                 opacity: 0;
  48                 // ensure the invisible checkbox takes up the required width
  49                 width: @checkboxSize;
  50                 height: @checkboxSize;
  51                 // This is needed for Firefox mobile (See bug 71750 to workaround default Firefox stylesheet)
  52                 max-width: none;
  53
  54                 // the pseudo before element of the label after the checkbox now looks like a checkbox
  55                 & + label {
  56                         cursor: pointer;
  57                         margin: 0 .4em;
  58
  59                         &::before {
  60                                                 content: '';
  61                                                 position: absolute;
  62                                                 left: 0;
  63                                                 display: inline-block;
  64                                                 border-radius: @borderRadius;
  65                                                 margin-right: 18px;
  66                                                 width: @checkboxSize;
  67                                                 height: @checkboxSize;
  68                                                 background-color: #fff;
  69                                                 border: 1px solid grey;
  70                                         }
  71                 }
  72
  73                 // when the input is checked, style the label pseudo before element that followed as a checked checkbox
  74                 &:checked {
  75                         + label {
  76                                 &::before {
  77                                         .background-image-svg('images/checked.svg', 'images/checked.png');
  78                                         .background-size( @checkboxSize, @checkboxSize );
  79                                         background-repeat: no-repeat;
  80                                         background-position: center top;
  81                                 }
  82                         }
  83                 }
  84
  85                 @focusBottomBorderSize: 0.2em;
  86                 &:active,
  87                 &:focus {
  88                         + label {
  89                                 &::after {
  90                                         content: '';
  91                                         position: absolute;
  92                                         width: @checkboxSize;
  93                                         height: @checkboxSize - @focusBottomBorderSize + 0.08; // offset by bottom border
  94                                         // offset from the checkbox by 1px to account for left border
  95                                         left: 1px;
  96                                         border-bottom: solid @focusBottomBorderSize lightgrey;
  97                                 }
  98                         }
  99                 }
 100
 101                 // disabled checked boxes have a gray background
 102                 &:disabled + label {
 103                         cursor: default;
 104
 105                         &::before {
 106                                 background-color: lightgrey;
 107                         }
 108                 }
 109         }
 110 }