_layout.scss

@import '../colors';
@import '../shadow/shadow';
@import '../typography/typography';
@import '../animation/animation';

// Dimensions
$layout-drawer-narrow: 240px;
$layout-drawer-wide: 456px;
$layout-drawer-width: $layout-drawer-narrow;

$layout-header-icon-size: 32px;
$layout-screen-size-threshold: 850px;

$layout-header-mobile-row-height: 56px;
$layout-mobile-header-height: $layout-header-mobile-row-height;
$layout-header-desktop-row-height: 64px;
$layout-desktop-header-height: $layout-header-desktop-row-height;
$layout-header-mobile-indent: 72px;
$layout-header-desktop-indent: 80px;
$layout-header-basic-mobile-indent: 16px;
$layout-header-basic-desktop-indent: 24px;

$layout-tab-bar-height: 48px;
$layout-tab-mobile-padding: 12px;
$layout-tab-desktop-padding: 24px;
$layout-tab-highlight-thickness: 2px;


// Navigation classes. Only used here for now, but we may at some point move
// this to its own component.
.wsk-navigation {
  display: flex;
  flex-wrap: nowrap;
}

.wsk-navigation__link {
  color: $layout-text-color;
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  margin: 0;
}

.wsk-navigation__link:hover {
  background-color: nth($palette-page, 4);
}


// Main layout class.
.wsk-layout {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  overflow-x: hidden;
  position: relative;
}

.wsk-layout__container {
  position: absolute;
  width: 100%;
  height: 100%;
}


  // Optional utility classes for formatting special blocks in this component.
  .wsk-layout-title {
    display: block;
    position: relative;

    @include typo-title();
    box-sizing: border-box;
  }

  .wsk-layout-spacer {
    flex-grow: 1;
  }


  // Drawer.
  .wsk-layout__drawer {
    display: flex;
    flex-direction: column;
    flex-wrap: nowrap;

    width: $layout-drawer-width;
    height: 100%;
    max-height: 100%;

    position: absolute;
    top: 0;
    left: 0;

    @include shadow-z1();

    box-sizing: border-box;
    border-right: 1px solid $layout-drawer-border-color;
    background: $layout-drawer-bg-color;

    // Transform offscreen.
    transform: translateX(-$layout-drawer-width - 10px);
    transform-style: preserve-3d;
    will-change: transform;

    @include material-animation-default();
    transition-property: transform;

    color: nth($palette-page, 9);

    overflow-x: hidden;
    overflow-y: auto;

    z-index: 5;

    &.is-visible {
      transform: translateX(0);
    }

    & > * {
      flex-shrink: 0;
    }

    & > .wsk-layout-title {
      line-height: $layout-desktop-header-height;
      padding-left: $layout-header-basic-desktop-indent;
      border-bottom: 1px solid $layout-drawer-border-color;

      @media screen and (max-width: $layout-screen-size-threshold) {
        line-height: $layout-mobile-header-height;
        padding-left: $layout-header-basic-mobile-indent;
      }
    }

    & .wsk-navigation {
      width: 100%;
      flex-direction: column;
    }

    & .wsk-navigation__link {
      padding: 16px $layout-header-basic-desktop-indent;
      margin: 0;

      @media screen and (max-width: $layout-screen-size-threshold) {
        padding: 16px $layout-header-basic-mobile-indent;
      }
    }

    @media screen and (min-width: $layout-screen-size-threshold + 1px) {
      .wsk-layout--fixed-drawer > & {
        transform: translateX(0);
        z-index: 2;
      }
    }
  }


  // Drawer button.
  // TODO(sgomes): Replace with an icon button when we have that component.
  .wsk-layout__drawer-button {
    display: block;

    position: relative;
    height: 32px;
    width: 32px;
    border: 0;

    flex-shrink: 0;

    overflow: hidden;
    font-size: 26px;
    line-height: 32px;
    font-family: Helvetica, Arial, sans-serif;
    margin: 8px;

    color: rgba(0, 0, 0, 0.5);

    z-index: 3;

    &::after {
      // TODO(sgomes): Replace with proper menu icon once we have an icon font.
      content: '☰';
    }

    .wsk-layout--overlay-drawer-button > & {
      position: absolute;
      top: 0;
      left: 0;
    }

    .wsk-layout__header & {
      position: absolute;
      left: $layout-header-basic-desktop-indent;
      top: ($layout-desktop-header-height - $layout-header-icon-size) / 2;
      height: $layout-header-icon-size;
      margin: 0;
      width: $layout-header-icon-size;
      color: $layout-header-text-color;
      background-color: $layout-header-bg-color;

      @media screen and (max-width: $layout-screen-size-threshold) {
        left: $layout-header-basic-mobile-indent;
        top: ($layout-mobile-header-height - $layout-header-icon-size) / 2;
      }
    }

    @media screen and (min-width: $layout-screen-size-threshold + 1px) {
      display: none;
    }
  }


  // Header.
  .wsk-layout__header {
    display: flex;
    flex-direction: row;
    flex-wrap: nowrap;
    align-items: center;
    margin: 0;
    border: none;
    height: $layout-desktop-header-height;
    min-height: $layout-desktop-header-height;
    background-color: $layout-header-bg-color;
    color: $layout-header-text-color;
    z-index: 3;
    @include material-animation-default();
    @include shadow-z1();
    transition-property: min-height, box-shadow;
    padding-left: $layout-header-desktop-indent;
    overflow: hidden;

    @media screen and (max-width: $layout-screen-size-threshold) {
      height: $layout-mobile-header-height;
      min-height: $layout-mobile-header-height;
      padding-left: $layout-header-mobile-indent;
    }

    .wsk-layout--fixed-drawer:not(.is-small-screen) > & {
      padding-left: $layout-header-basic-desktop-indent;
    }

    & > .wsk-layout-icon {
      position: absolute;
      left: $layout-header-basic-desktop-indent;
      top: ($layout-desktop-header-height - $layout-header-icon-size) / 2;
      height: $layout-header-icon-size;
      width: $layout-header-icon-size;
      overflow: hidden;
      z-index: 3;

      @media screen and (max-width: $layout-screen-size-threshold) {
        left: $layout-header-basic-mobile-indent;
        top: ($layout-mobile-header-height - $layout-header-icon-size) / 2;
      }
    }

    &.is-compact {
      min-height: $layout-header-desktop-row-height;

      @media screen and (max-width: $layout-screen-size-threshold) {
        min-height: $layout-header-mobile-row-height;
      }
    }

    & > * {
      flex-shrink: 0;
    }

    // Add a margin to the last entry...
    & > *:last-child {
      margin-right: $layout-header-basic-desktop-indent;

      @media screen and (max-width: $layout-screen-size-threshold) {
        margin-right: $layout-header-basic-mobile-indent;
      }
    }

    // ...unless it's a navigation area.
    & > .wsk-navigation:last-child {
      margin-right: 0;
    }

    & .wsk-layout-title {
      display: block;
    }

    & .wsk-navigation {
      margin: 0;
      padding: 0;
      height: $layout-header-desktop-row-height;
      flex-direction: row;
      align-items: center;

      @media screen and (max-width: $layout-screen-size-threshold) {
        height: $layout-header-mobile-row-height;
      }
    }

    & .wsk-navigation__link {
      color: $layout-header-text-color;
      line-height: $layout-header-desktop-row-height;
      padding: 0 $layout-header-basic-desktop-indent;

      @media screen and (max-width: $layout-screen-size-threshold) {
        line-height: $layout-header-mobile-row-height;
        padding: 0 $layout-header-basic-mobile-indent;
      }
    }

    & .wsk-navigation__link:hover {
      background-color: rgba(nth($palette-grey, 8), 0.6);
    }

    @media screen and (min-width: $layout-screen-size-threshold + 1px) {
      .wsk-layout--fixed-drawer > & {
        margin-left: $layout-drawer-width;
      }
    }

    @media screen and (max-width: $layout-screen-size-threshold) {
      & {
        display: none;
      }

      .wsk-layout--fixed-header > & {
        display: flex;
      }

      & .wsk-layout-title {
        margin-left: 24px;
      }

      .wsk-layout--fixed-header.wsk-layout--overlay-drawer-button > & {
            & > .wsk-layout-icon {
                left: $layout-header-basic-mobile-indent + 32px;
            }
           & .wsk-layout-title {
                margin-left: 12px;
           }
      }
    }
  }

    .wsk-layout__header--multi-row {
      flex-direction: column;
    }

    .wsk-layout__header--medium-tall {
      min-height: 2 * $layout-header-desktop-row-height;

      @media screen and (max-width: $layout-screen-size-threshold) {
        min-height: 2 * $layout-header-mobile-row-height;
      }
    }

    .wsk-layout__header--tall {
      min-height: 3 * $layout-header-desktop-row-height;

      @media screen and (max-width: $layout-screen-size-threshold) {
        min-height: 3 * $layout-header-mobile-row-height;
      }
    }

    .wsk-layout__header--transparent.wsk-layout__header--transparent {
      background-color: transparent;
      box-shadow: none;
    }

    .wsk-layout__header--seamed {
      box-shadow: none;
    }

    .wsk-layout__header--scroll {
      box-shadow: none;
    }

    .wsk-layout__header--waterfall {
      box-shadow: none;

      &.is-casting-shadow {
        @include shadow-z1();
      }
    }

    // Declared twice to bump rule priority.
    .wsk-layout__header-row.wsk-layout__header-row {
      display: flex;
      flex-direction: row;
      flex-wrap: nowrap;
      flex-shrink: 0;
      align-items: center;
      min-height: $layout-header-desktop-row-height;
      width: 100%;
      margin-right: 0;

      @media screen and (max-width: $layout-screen-size-threshold) {
        min-height: $layout-header-mobile-row-height;
      }

      & > .wsk-layout-icon {
        position: absolute;
        left: $layout-header-basic-desktop-indent;
        top: ($layout-header-desktop-row-height - $layout-header-icon-size) / 2;
        height: $layout-header-icon-size;
        width: $layout-header-icon-size;
        overflow: hidden;
        z-index: 3;

        @media screen and (max-width: $layout-screen-size-threshold) {
          left: $layout-header-basic-mobile-indent;
          top: ($layout-header-mobile-row-height - $layout-header-icon-size) / 2;
        }
      }

      & > * {
        flex-shrink: 0;
      }

      // Add a margin to the last entry...
      & > *:last-child {
        margin-right: $layout-header-basic-desktop-indent;

        @media screen and (max-width: $layout-screen-size-threshold) {
          margin-right: $layout-header-basic-mobile-indent;
        }
      }

      // ...unless it's a navigation area.
      & > .wsk-navigation:last-child {
        margin-right: 0;
      }
    }

  // Obfuscator.
  @media screen and (max-width: $layout-screen-size-threshold) {
    .wsk-layout__obfuscator {
      background-color: transparent;
      position: absolute;
      top: 0;
      left: 0;
      height: 100%;
      width: 100%;
      z-index: 4;
      visibility: hidden;
      transition-property: background-color;
      @include material-animation-default();

      .wsk-layout__drawer.is-visible ~ & {
        background-color: rgba(0, 0, 0, 0.5);
        visibility: visible;
      }
    }
  }


  // Content.
  .wsk-layout__content {
    // Fix IE10 bug.
    -ms-flex: 0 1 auto;

    display: inline-block;
    overflow-y: auto;
    overflow-x: hidden;
    flex-grow: 1;
    z-index: 1;

    .wsk-layout--fixed-drawer > & {
      margin-left: $layout-drawer-width;
    }

    .wsk-layout__header--scroll ~ & {
      overflow: visible;
    }

    @media screen and (max-width: $layout-screen-size-threshold) {
      .wsk-layout--fixed-drawer > & {
        margin-left: 0;
      }

      .wsk-layout__header--scroll ~ & {
        overflow-y: auto;
        overflow-x: hidden;
      }
    }
  }

  // Tabs.
  .wsk-layout__tab-bar {
    position: absolute;
    top: 0;
    height: $layout-tab-bar-height * 2;
    width: calc(100% -
        #{(($layout-header-desktop-indent - $layout-tab-desktop-padding) * 2)});
    padding: 0 0 0 $layout-header-desktop-indent - $layout-tab-desktop-padding;
    display: flex;
    background-color: $layout-header-bg-color;
    overflow-y: hidden;
    overflow-x: scroll;

    &::-webkit-scrollbar {
      display: none;
    }

    @media screen and (max-width: $layout-screen-size-threshold) {
      width: calc(100% -
          #{($layout-header-mobile-indent - $layout-tab-mobile-padding)});
      padding: 0 0 0 $layout-header-mobile-indent - $layout-tab-mobile-padding;
    }

    .wsk-layout--fixed-tabs & {
      padding: 0;
      overflow: hidden;
      width: 100%;
    }

    &.is-casting-shadow {
      @include shadow-z1();
    }
  }

  .wsk-layout__tab-bar-container {
    position: relative;
    overflow: hidden;
    height: $layout-tab-bar-height;
    width: 100%;
    border: none;
    margin: 0;
    z-index: 3;
    flex-grow: 0;
    flex-shrink: 0;
    @include shadow-z1();

    .wsk-layout__container > & {
      position: absolute;
      top: 0;
      left: 0;
    }
  }

  .wsk-layout__tab-bar-button {
    display: inline-block;
    position: absolute;
    height: $layout-tab-bar-height;
    line-height: $layout-tab-bar-height;
    width: $layout-header-desktop-indent - $layout-tab-desktop-padding;
    z-index: 4;
    text-align: center;
    background-color: $layout-header-bg-color;
    color: transparent;
    cursor: pointer;

    @media screen and (max-width: $layout-screen-size-threshold) {
      display: none;
      width: $layout-header-mobile-indent - $layout-tab-mobile-padding;
    }

    .wsk-layout--fixed-tabs & {
      display: none;
    }

    &.is-active {
      color: $layout-header-text-color;
    }
  }

  .wsk-layout__tab-bar-left-button {
    left: 0;

    &::after {
      // TODO(sgomes): replace with left chevron when we have an icon font.
      font-size: 26px;
      content: "<";
    }
  }

  .wsk-layout__tab-bar-right-button {
    right: 0;

    &::after {
      // TODO(sgomes): replace with left chevron when we have an icon font.
      font-size: 26px;
      content: ">";
    }
  }

  .wsk-layout__tab {
    margin: 0;
    border: none;
    padding: 0 $layout-tab-desktop-padding 0 $layout-tab-desktop-padding;

    float: left;
    position: relative;
    display: block;
    flex-grow: 0;
    flex-shrink: 0;

    text-decoration: none;
    height: $layout-tab-bar-height;
    line-height: $layout-tab-bar-height;

    text-align: center;
    font-weight: 500;
    font-size: 14px;
    text-transform: uppercase;

    color: rgba($layout-header-text-color, 0.6);
    overflow: hidden;

    @media screen and (max-width: $layout-screen-size-threshold) {
      padding: 0 $layout-tab-mobile-padding 0 $layout-tab-mobile-padding;
    }

    .wsk-layout--fixed-tabs & {
      float: none;
      flex-grow: 1;
      padding: 0;
    }

    .wsk-layout.is-upgraded &.is-active {
      color: $layout-header-text-color;
    }

    .wsk-layout.is-upgraded &.is-active::after {
      height: $layout-tab-highlight-thickness;
      width: 100%;
      display: block;
      content: " ";
      bottom: 0;
      left: 0;
      position: absolute;
      background: $layout-header-tab-highlight;
      -webkit-animation: border-expand 0.2s cubic-bezier(0.4, 0.0, 0.4, 1) 0s alternate forwards;
      -moz-animation: border-expand 0.2s cubic-bezier(0.4, 0.0, 0.4, 1) 0s alternate forwards;
      transition: all 1s cubic-bezier(0.4, 0.0, 1, 1);
    }

    & .wsk-layout__tab-ripple-container {
      display: block;
      position: absolute;
      height: 100%;
      width: 100%;
      left: 0;
      top: 0;
      z-index: 1;
      overflow: hidden;
    }
  }

  .wsk-layout__tab-panel {
    display: block;

    .wsk-layout.is-upgraded & {
      display: none;
    }

    .wsk-layout.is-upgraded &.is-active {
      display: block;
    }
  }