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 bug 72727)
  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 bug 71750 to workaround default Firefox stylesheet)
  62                 max-width: none;
  63                 margin: 0 0.4em 0 0;
  64                 display: table-cell;
  65
  66                 & + label {
  67                         display: table-cell;
  68                 }
  69
  70                 // the pseudo before element of the label after the checkbox now looks like a checkbox
  71                 & + label::before {
  72                         content: '';
  73                         background-color: #fff;
  74                         .background-image-svg( 'images/checked.svg', 'images/checked.png' );
  75                         background-position: center center;
  76                         background-origin: border-box;
  77                         background-repeat: no-repeat;
  78                         .background-size( @checkboxSize - 0.2em, @checkboxSize - 0.2em );
  79                         background-size: 0 0;
  80                         .box-sizing( border-box );
  81                         position: absolute;
  82                         // align the checkbox to middle of the text
  83                         top: 50%;
  84                         left: 0;
  85                         width: @checkboxSize;
  86                         height: @checkboxSize;
  87                         margin-top: -1em;
  88                         border: 1px solid @colorGray7;
  89                         border-radius: @borderRadius;
  90                         line-height: @checkboxSize;
  91                         cursor: pointer;
  92                 }
  93
  94                 // when the input is checked, style the label pseudo before element that followed as a checked checkbox
  95                 &:checked + label::before {
  96                         background-size: 100% 100%;
  97                 }
  98
  99                 &:active + label::before {
 100                         background-color: @colorGray13;
 101                         border-color: @colorGray13;
 102                 }
 103
 104                 &:focus + label::before {
 105                         border-width: 2px;
 106                 }
 107
 108                 &:focus:hover + label::before,
 109                 &:hover + label::before {
 110                         border-bottom-width: 3px;
 111                 }
 112
 113                 // disabled checkboxes have a gray background
 114                 &:disabled + label::before {
 115                         cursor: default;
 116                         background-color: @colorGray14;
 117                         border-color: @colorGray14;
 118                 }
 119
 120                 // disabled and checked checkboxes have a white circle
 121                 &:disabled:checked + label::before {
 122                         .background-image-svg( 'images/checked_disabled.svg', 'images/checked_disabled.png' );
 123                 }
 124         }
 125 }