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 IE 6-8 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-3">
  15 //   <label for="kss-example-3">Standard checkbox</label>
  16 // </div>
  17 // <div class="mw-ui-checkbox">
  18 //   <input type="checkbox" id="kss-example-3-checked" checked>
  19 //   <label for="kss-example-3-checked">Standard checked checkbox</label>
  20 // </div>
  21 // <div class="mw-ui-checkbox">
  22 //   <input type="checkbox" id="kss-example-3-disabled" disabled>
  23 //   <label for="kss-example-3-disabled">Disabled checkbox</label>
  24 // </div>
  25 // <div class="mw-ui-checkbox">
  26 //   <input type="checkbox" id="kss-example-3-disabled-checked" disabled checked>
  27 //   <label for="kss-example-3-disabled-checked">Disabled checked checkbox</label>
  28 // </div>
  29 //
  30 // Styleguide 3.
  31 .mw-ui-checkbox {
  32         display: inline-block;
  33         vertical-align: middle;
  34 }
  35
  36 // We use the not selector to cancel out styling on IE 8 and below
  37 // We also disable this styling on JavaScript disabled devices. This fixes the issue with
  38 // Opera Mini where checking/unchecking doesn't apply styling but potentially leaves other
  39 // more capable browsers with unstyled checkboxes.
  40 .client-js .mw-ui-checkbox:not( #noop ) {
  41         // Position relatively so we can make use of absolute pseudo elements
  42         position: relative;
  43         display: table;
  44
  45         * {
  46                 // reset font sizes (see T74727)
  47                 font: inherit;
  48                 vertical-align: middle;
  49         }
  50
  51         input[type='checkbox'] {
  52                 // we hide the input element as instead we will style the label that follows
  53                 // we use opacity so that VoiceOver software can still identify it
  54                 opacity: 0;
  55                 // Render *on top of* the label, so that it's still clickable (T98905)
  56                 z-index: 1;
  57                 position: relative;
  58                 // ensure the invisible checkbox takes up the required width
  59                 width: @checkboxSize;
  60                 height: @checkboxSize;
  61                 // This is needed for Firefox mobile (See T73750 to workaround default Firefox stylesheet)
  62                 max-width: none;
  63                 margin: 0 0.4em 0 0;
  64                 cursor: pointer;
  65                 display: table-cell;
  66
  67                 & + label {
  68                         display: table-cell;
  69                         cursor: pointer;
  70                 }
  71
  72                 // the pseudo before element of the label after the checkbox now looks like a checkbox
  73                 & + label:before {
  74                         content: '';
  75                         background-color: #fff;
  76                         .background-image-svg( 'images/checked.svg', 'images/checked.png' );
  77                         background-position: center center;
  78                         background-origin: border-box;
  79                         background-repeat: no-repeat;
  80                         .background-size( 0, 0 );
  81                         .box-sizing( border-box );
  82                         position: absolute;
  83                         // align the checkbox to middle of the text
  84                         top: 50%;
  85                         left: 0;
  86                         width: @checkboxSize;
  87                         height: @checkboxSize;
  88                         margin-top: -1em;
  89                         border: 1px solid @colorGray7;
  90                         border-radius: @borderRadius;
  91                         line-height: @checkboxSize;
  92                         cursor: pointer;
  93                 }
  94
  95                 // when the input is checked, style the label pseudo before element that followed as a checked checkbox
  96                 &:checked + label:before {
  97                         .background-size( 100%, 100% );
  98                 }
  99
 100                 &:active + label:before {
 101                         background-color: @colorGray13;
 102                         border-color: @colorGray13;
 103                 }
 104
 105                 &:focus + label:before {
 106                         border-width: 2px;
 107                 }
 108
 109                 &:focus:hover + label:before,
 110                 &:hover + label:before {
 111                         border-bottom-width: 3px;
 112                 }
 113
 114                 // disabled checkboxes have a gray background
 115                 &:disabled + label:before {
 116                         cursor: default;
 117                         background-color: @colorGray14;
 118                         border-color: @colorGray14;
 119                 }
 120
 121                 // disabled and checked checkboxes have a white circle
 122                 &:disabled:checked + label:before {
 123                         .background-image-svg( 'images/checked_disabled.svg', 'images/checked_disabled.png' );
 124                 }
 125         }
 126 }