_button.scss

@import "../typography/typography";
@import "../colors";
@import "../shadow/shadow";
@import "../animation/animation";
@import "../ripple/ripple";


/**
 *
 * Dimensions
 *
 */
$button-min-width: 64px !default;
$button-height: 36px !default;
$button-padding: 8px !default;
$button-margin: 4px !default;
$button-border-radius: 2px !default;

$button-fab-size: 56px !default;
$button-fab-size-mini: 40px !default;
$button-fab-font-size: 24px !default;

$button-icon-size: 32px !default;
$button-icon-size-mini: 24px !default;

// Focus shadow mixin.
@mixin focus-shadow() {
  box-shadow: 0 0 8px rgba(0,0,0,.18),0 8px 16px rgba(0,0,0,.36);
}


// The button component. Defaults to a flat button.
.wsk-button {
  background: transparent;
  border: none;
  border-radius: $button-border-radius;
  color: $button-secondary-color;
  display: block;
  position: relative;
  height: $button-height;
  min-width: $button-min-width;
  padding: 0 $button-padding;
  margin: 0 $button-margin;
  display: inline-block;
  @include typo-button();
  overflow: hidden;
  will-change: box-shadow, transform;
  transition: box-shadow 0.2s $animation-curve-fast-out-linear-in,
              background-color 0.2s $animation-curve-default,
              color 0.2s $animation-curve-default;
  outline: none;
  cursor: pointer;

  &::-moz-focus-inner {
    border: 0;
  }

  &:hover {
    background-color: $button-hover-color;
  }

  &:focus:not(:active) {
    background-color: $button-focus-color;
  }

  &:active {
    background-color: $button-active-color;
  }

  // Bump up specificity by using [disabled] twice.
  &[disabled][disabled] {
    color: $button-secondary-color-disabled;
    cursor: auto;
    background-color: transparent;
  }

  &.wsk-button--colored {
    color: $button-primary-color-alt;

    &:focus:not(:active) {
      background-color: $button-focus-color-alt;
    }
  }
}


  // Raised buttons
  .wsk-button--raised {
    background: $button-primary-color;
    @include shadow-z1();

    &:active {
      @include shadow-z3();
      background-color: $button-active-color;
    }

    &:focus:not(:active) {
      @include focus-shadow();
      background-color: $button-active-color;
    }

    &.wsk-button--colored {
      background: $button-primary-color-alt;
      color: $button-secondary-color-alt;

      &:hover {
        background-color: $button-hover-color-alt;
      }

      &:active {
        background-color: $button-active-color-alt;
      }

      &:focus:not(:active) {
        background-color: $button-active-color-alt;
      }

      & .wsk-ripple {
        background: $button-ripple-color-alt;
      }
    }

    // Bump up specificity by using [disabled] twice.
    &[disabled][disabled] {
      background-color: $button-primary-color-disabled;
      color: $button-secondary-color-disabled;
      @include shadow-z1();
    }
  }


  // FABs
  .wsk-button--fab {
    border-radius: 50%;
    font-size: $button-fab-font-size;
    height: $button-fab-size;
    margin: auto;
    min-width: $button-fab-size;
    width: $button-fab-size;
    padding: 0;
    overflow: hidden;
    background: $button-primary-color;

    @include shadow-z1();

    &.wsk-button--mini-fab {
      height: $button-fab-size-mini;
      min-width: $button-fab-size-mini;
      width: $button-fab-size-mini;
    }

    & .wsk-button__ripple-container {
      border-radius: 50%;
      // Fixes clipping bug in Safari.
      -webkit-mask-image: -webkit-radial-gradient(circle, white, black);
    }

    &:active {
      @include shadow-z3();
      background-color: $button-active-color;
    }

    &:focus:not(:active) {
      @include focus-shadow();
      background-color: $button-active-color;
    }

    &.wsk-button--colored {
      background-color: $button-fab-color-alt;
      color: $button-secondary-color-alt;

      &:hover {
        background-color: $button-fab-hover-color-alt;
      }

      &:focus:not(:active) {
        background-color: $button-fab-active-color-alt;
      }

      &:active {
        background-color: $button-fab-active-color-alt;
      }

      & .wsk-ripple {
        background: $button-ripple-color-alt;
      }
    }

    // Bump up specificity by using [disabled] twice.
    &[disabled][disabled] {
      background-color: $button-primary-color-disabled;
      color: $button-secondary-color-disabled;
      @include shadow-z1();
    }
  }


  // Icon buttons
  .wsk-button--icon {
    border-radius: 50%;
    font-size: $button-fab-font-size;
    height: $button-icon-size;
    margin-left: 0;
    margin-right: 0;
    min-width: $button-icon-size;
    width: $button-icon-size;
    padding: 0;
    overflow: hidden;

    &.wsk-button--mini-icon {
      height: $button-icon-size-mini;
      min-width: $button-icon-size-mini;
      width: $button-icon-size-mini;
    }

    & .wsk-button__ripple-container {
      border-radius: 50%;
      // Fixes clipping bug in Safari.
      -webkit-mask-image: -webkit-radial-gradient(circle, white, black);
    }
  }


  // Ripples
  .wsk-button__ripple-container {
    display: block;
    height: 100%;
    left: 0px;
    position: absolute;
    top: 0px;
    width: 100%;
    z-index: 0;
    overflow: hidden;

    .wsk-button[disabled] & .wsk-ripple {
      background-color: transparent;
    }
  }