edx-platform/common/static/sass/_mixins.scss

// studio - utilities - mixins and extends
// ====================

// mixins - font sizing
@mixin font-size($sizeValue: 16){
  font-size: $sizeValue + px;
  font-size: ($sizeValue/10) + rem;
}

// mixins - line height
@mixin line-height($fontSize: auto){
  line-height: ($fontSize*1.48) + px;
  line-height: (($fontSize/10)*1.48) + rem;
}

// ====================

// mixins - sizing
@mixin size($width: $baseline, $height: $baseline) {
  height: $height;
  width: $width;
}

// mixins - sizing
@mixin square($size: $baseline) {
  @include size($size);
}

// ====================

// mixins - placeholder styling
@mixin placeholder($color) {
  :-moz-placeholder {
    color: $color;
  }
  ::-webkit-input-placeholder {
    color: $color;
  }
  :-ms-input-placeholder {
     color: $color;
  }
}

// ====================

// extends - UI - used for page/view-level wrappers (for centering/grids)
%ui-wrapper {
  @include clearfix();
  @include box-sizing(border-box);
  width: 100%;
}

// extends - UI - window
%ui-window {
  @include clearfix();
  border-radius: 3px;
  box-shadow: 0 1px 1px $shadow-l1;
  margin-bottom: $baseline;
  border: 1px solid $gray-l2;
  background: $white;
}

// extends - UI - visual link
%ui-fake-link {
  cursor: pointer;
}

// extends - UI - functional disable
%ui-disabled {
  pointer-events: none;
  outline: none;
}

// extends - UI - depth levels
%ui-depth0 { z-index: 0; }
%ui-depth1 { z-index: 10; }
%ui-depth2 { z-index: 100; }
%ui-depth3 { z-index: 1000; }
%ui-depth4 { z-index: 10000; }
%ui-depth5 { z-index: 100000; }


// extends - UI - utility - nth-type style clearing
%wipe-first-child {

  &:first-child {
    margin-top: 0;
    border-top: none;
    padding-top: 0;
  }
}

// extends - UI - utility - nth-type style clearing
%wipe-last-child {

  &:last-child {
    margin-bottom: 0;
    border-bottom: none;
    padding-bottom: 0;
  }
}

// extends - UI - buttons
%ui-btn {
  @include box-sizing(border-box);
  @include transition(color 0.25s ease-in-out 0s, border-color 0.25s ease-in-out 0s, background 0.25s ease-in-out 0s, box-shadow 0.25s ease-in-out 0s);
  display: inline-block;
  cursor: pointer;

  &:hover, &:active {

  }

  &.disabled, &[disabled], &.is-disabled {
    cursor: default;
    pointer-events: none;
    opacity: 0.5;
  }

  .icon-inline {
    display: inline-block;
    vertical-align: middle;
    margin-right: ($baseline/4);
  }
}

// pill button
%ui-btn-pill {
  border-radius: ($baseline/5);
}

%ui-btn-rounded {
  border-radius: ($baseline/2);
}

// primary button
%ui-btn-primary {
  @extend %ui-btn;
  @extend %ui-btn-pill;
  padding:($baseline/2) $baseline;
  border-width: 1px;
  border-style: solid;
  line-height: 1.5em;
  text-align: center;

  &:hover, &:active {
    box-shadow: 0 2px 1px $shadow-l1;
  }

  &.current, &.active {
    box-shadow: inset 1px 1px 2px $shadow-d1;

    &:hover, &:active {
      box-shadow: inset 1px 1px 1px $shadow-d1;
    }
  }
}

// secondary button
%ui-btn-secondary {
  @extend %ui-btn;
  @extend %ui-btn-pill;
  border-width: 1px;
  border-style: solid;
  padding:($baseline/2) $baseline;
  background: transparent;
  line-height: 1.5em;
  text-align: center;

  &:hover, &:active {

  }

  &.current, &.active {

  }
}

%ui-btn-flat-outline {
  @extend %t-action4;
  @include transition(all .15s);
  font-weight: 600;
  text-align: center;
  border-radius: ($baseline/4);
  border: 1px solid $blue-l2;
  padding: 1px ($baseline/2) 2px ($baseline/2);
  background-color: $white;
  color: $blue-l2;

  &:hover {
    border: 1px solid $blue;
    background-color: $blue;
    color: $white;
  }

  &.is-disabled,
  &[disabled="disabled"]{
   border: 1px solid $gray-l2;
   background-color: $gray-l4;
   color: $gray-l2;
   pointer-events: none;
  }
}

// button with no button shell until hover for understated actions
%ui-btn-non {
  @include transition(all .15s);
  border: none;
  border-radius: ($baseline/4);
  background: none;
  padding: 3px ($baseline/2);
  vertical-align: middle;
  color: $gray-l1;

  &:hover {
    background-color: $gray-l1;
    color: $white;
  }

  span {
    @extend %cont-text-sr;
  }
}

// extends - UI archetypes - well
%ui-well {
  box-shadow: inset 0 1px 2px 1px $shadow;
  padding: ($baseline*0.75) $baseline;
}

// ====================

// extends - content - removes list styling/spacing when using uls, ols for navigation and less content-centric cases
%cont-no-list {
  list-style: none;
  margin: 0;
  padding: 0;
  text-indent: 0;

  li {
    margin: 0;
    padding: 0;
  }
}

// extends - content - image-replacement hidden text
%cont-text-hide {
  text-indent: 100%;
  white-space: nowrap;
  overflow: hidden;
}

// extends - content - hidden elems - screenreaders
%cont-text-sr {
  border: 0;
  clip: rect(0 0 0 0);
  height: 1px;
  margin: -1px;
  overflow: hidden;
  padding: 0;
  position: absolute;
  width: 1px;
}

// extends - content - wrapping
%cont-text-wrap {
  text-wrap: wrap;
  white-space: pre-wrap;
  white-space: -moz-pre-wrap;
  word-wrap: break-word;
}

// extends - content - text overflow by ellipsis
%cont-truncated {
  @include box-sizing(border-box);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}