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   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-5-2" disabled><label for="kss-example-5-2">Disabled checkbox</label>
  18  // </div>
  19  //
  20  // Styleguide 5.
  21  .mw-ui-checkbox {
  22      display: inline-block;
  23      vertical-align: middle;
  24  }
  25  
  26  @checkboxSize: 24px;
  27  
  28  // We use the not selector to cancel out styling on IE 8 and below
  29  .mw-ui-checkbox:not(#noop) {
  30      // Position relatively so we can make use of absolute pseudo elements
  31      position: relative;
  32      line-height: @checkboxSize;
  33  
  34      * {
  35          vertical-align: middle;
  36      }
  37  
  38      input[type="checkbox"] {
  39          // we hide the input element as instead we will style the label that follows
  40          // we use opacity so that VoiceOver software can still identify it
  41          opacity: 0;
  42          // ensure the invisible checkbox takes up the required width
  43          width: @checkboxSize;
  44          height: @checkboxSize;
  45  
  46          // the pseudo before element of the label after the checkbox now looks like a checkbox
  47          & + label {
  48              cursor: pointer;
  49  
  50              &::before {
  51                          content: '';
  52                          position: absolute;
  53                          left: 0;
  54                          display: inline-block;
  55                          border-radius: @borderRadius;
  56                          margin-right: 18px;
  57                          width: @checkboxSize;
  58                          height: @checkboxSize;
  59                          background-color: #fff;
  60                          border: 1px solid grey;
  61                      }
  62          }
  63  
  64          // when the input is checked, style the label pseudo before element that followed as a checked checkbox
  65          &:checked {
  66              + label {
  67                  &::before {
  68                      .background-image-svg('images/checked.svg', 'images/checked.png');
  69                      background-repeat: no-repeat;
  70                      background-position: center top;
  71                  }
  72              }
  73          }
  74  
  75          @focusBottomBorderSize: 3px;
  76          &:active,
  77          &:focus {
  78              + label {
  79                  &::after {
  80                      content: '';
  81                      position: absolute;
  82                      width: @checkboxSize;
  83                      height: @checkboxSize - @focusBottomBorderSize + 1; // offset by bottom border
  84                      // offset from the checkbox by 1px to account for left border
  85                      left: 1px;
  86                      border-bottom: solid @focusBottomBorderSize lightgrey;
  87                  }
  88              }
  89          }
  90  
  91          // disabled checked boxes have a gray background
  92          &:disabled + label {
  93              cursor: default;
  94  
  95              &::before {
  96                  background-color: lightgrey;
  97              }
  98          }
  99      }
 100  }