samples/packages/mdc_web/src/scss/button/_mixins.scss

//
// Copyright 2016 Google Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//

@import "package:mdc_web/src/scss/elevation/mixins";
@import "package:mdc_web/src/scss/feature-targeting/functions";
@import "package:mdc_web/src/scss/feature-targeting/mixins";
@import "package:mdc_web/src/scss/ripple/mixins";
@import "package:mdc_web/src/scss/rtl/mixins";
@import "package:mdc_web/src/scss/theme/functions";
@import "package:mdc_web/src/scss/theme/mixins";
@import "package:mdc_web/src/scss/typography/mixins";
@import "package:mdc_web/src/scss/shape/mixins";
@import "package:mdc_web/src/scss/shape/functions";
@import "./variables";

@mixin mdc-button-core-styles($query: mdc-feature-all()) {
  @include mdc-button-without-ripple($query);
  @include mdc-button-ripple($query);
}

// This API is intended for use by frameworks that may want to separate the ripple-related styles from the other
// button styles. It is recommended that most users use `mdc-button-core-styles` instead.
@mixin mdc-button-without-ripple($query: mdc-feature-all()) {
  $feat-color: mdc-feature-create-target($query, color);
  $feat-structure: mdc-feature-create-target($query, structure);

  // postcss-bem-linter: define button
  .mdc-button {
    @include mdc-button-base_($query);
    @include mdc-button-shape-radius(small, $query: $query);
    @include mdc-button-container-fill-color(transparent, $query);

    // The icon CSS class overrides styles defined in the .material-icons CSS
    // class, which is loaded separately so the order of CSS definitions is not
    // guaranteed. Therefore, increase specifity by nesting this class to ensure
    // overrides apply.
    .mdc-button__icon {
      @include mdc-feature-targets($feat-structure) {
        @include mdc-button__icon_;
      }
    }

    @include mdc-button-ink-color(primary, $query);
  }

  .mdc-button__label + .mdc-button__icon {
    @include mdc-feature-targets($feat-structure) {
      @include mdc-button__icon-trailing_;
    }
  }

  // stylelint-disable-next-line selector-no-qualifying-type
  svg.mdc-button__icon {
    @include mdc-feature-targets($feat-structure) {
      @include mdc-button__icon-svg_;
    }
  }

  .mdc-button--raised,
  .mdc-button--unelevated,
  .mdc-button--outlined {
    .mdc-button__icon {
      @include mdc-feature-targets($feat-structure) {
        // Icons inside contained buttons have different styles due to increased button padding
        @include mdc-button__icon-contained_;
      }
    }

    .mdc-button__label + .mdc-button__icon {
      @include mdc-feature-targets($feat-structure) {
        @include mdc-button__icon-contained-trailing_;
      }
    }
  }

  .mdc-button--raised,
  .mdc-button--unelevated {
    @include mdc-button--filled_($query);
    @include mdc-button-container-fill-color(primary, $query);
    @include mdc-button-ink-color(on-primary, $query);
  }

  .mdc-button--raised {
    @include mdc-button--raised_($query);
  }

  .mdc-button--outlined {
    @include mdc-button--outlined_($query);
    @include mdc-button-outline-width($mdc-button-outlined-border-width, $query: $query);
    @include mdc-button-outline-color(primary, $query);
  }

  .mdc-button--dense {
    @include mdc-feature-targets($feat-structure) {
      @include mdc-button--dense_;
    }
  }
  // postcss-bem-linter: end
}

// This API is intended for use by frameworks that may want to separate the ripple-related styles from the other
// button styles. It is recommended that most users use `mdc-button-core-styles` instead.
@mixin mdc-button-ripple($query: mdc-feature-all()) {
  @include mdc-ripple-common($query);

  .mdc-button {
    @include mdc-ripple-surface($query);
    @include mdc-ripple-radius-bounded($query: $query);
    @include mdc-states(primary, false, $query);
  }

  .mdc-button--raised,
  .mdc-button--unelevated {
    @include mdc-states(on-primary, false, $query);
  }
}

@mixin mdc-button-filled-accessible($container-fill-color, $query: mdc-feature-all()) {
  $fill-tone: mdc-theme-tone($container-fill-color);

  @include mdc-button-container-fill-color($container-fill-color, $query);

  @if ($fill-tone == "dark") {
    @include mdc-button-ink-color(text-primary-on-dark, $query);
    @include mdc-states(text-primary-on-dark, $query: $query);
  } @else {
    @include mdc-button-ink-color(text-primary-on-light, $query);
    @include mdc-states(text-primary-on-light, $query: $query);
  }
}

@mixin mdc-button-container-fill-color($color, $query: mdc-feature-all()) {
  $feat-color: mdc-feature-create-target($query, color);

  // :not(:disabled) is used to support link styled as button
  // as link does not support :enabled style
  &:not(:disabled) {
    @include mdc-feature-targets($feat-color) {
      @include mdc-theme-prop(background-color, $color, $edgeOptOut: true);
    }
  }
}

@mixin mdc-button-outline-color($color, $query: mdc-feature-all()) {
  $feat-color: mdc-feature-create-target($query, color);

  &:not(:disabled) {
    @include mdc-feature-targets($feat-color) {
      @include mdc-theme-prop(border-color, $color);
    }
  }
}

@mixin mdc-button-icon-color($color, $query: mdc-feature-all()) {
  $feat-color: mdc-feature-create-target($query, color);

  &:not(:disabled) .mdc-button__icon {
    @include mdc-feature-targets($feat-color) {
      @include mdc-theme-prop(color, $color);
    }
  }
}

@mixin mdc-button-ink-color($color, $query: mdc-feature-all()) {
  $feat-color: mdc-feature-create-target($query, color);

  &:not(:disabled) {
    @include mdc-feature-targets($feat-color) {
      @include mdc-theme-prop(color, $color);
    }
  }
}

@mixin mdc-button-shape-radius($radius, $rtl-reflexive: false, $query: mdc-feature-all()) {
  @include mdc-shape-radius(
    mdc-shape-resolve-percentage-radius($mdc-button-height, $radius),
    $rtl-reflexive,
    $query: $query
  );

  &.mdc-button--dense {
    @include mdc-shape-radius(
      mdc-shape-resolve-percentage-radius($mdc-dense-button-height, $radius),
      $rtl-reflexive,
      $query: $query
    );
  }
}

@mixin mdc-button-horizontal-padding($padding, $query: mdc-feature-all()) {
  $feat-structure: mdc-feature-create-target($query, structure);

  @include mdc-feature-targets($feat-structure) {
    // $padding should be a single value; enforce it by specifying all 4 sides in the output
    padding: 0 $padding 0 $padding;
  }
}

@mixin mdc-button-outline-width(
  $outline-width,
  $padding: $mdc-button-contained-horizontal-padding,
  $query: mdc-feature-all()
) {
  $feat-structure: mdc-feature-create-target($query, structure);
  // Note: Adjust padding to maintain consistent width with non-outlined buttons
  $padding-value: max($padding - $outline-width, 0);

  @include mdc-button-horizontal-padding($padding-value, $query);

  @include mdc-feature-targets($feat-structure) {
    border-width: $outline-width;
  }
}

@mixin mdc-button-base_($query) {
  $feat-color: mdc-feature-create-target($query, color);
  $feat-structure: mdc-feature-create-target($query, structure);

  @include mdc-typography(button, $query);
  @include mdc-button-horizontal-padding($mdc-button-horizontal-padding, $query);

  @include mdc-feature-targets($feat-structure) {
    display: inline-flex;
    position: relative;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
    min-width: 64px;
    height: $mdc-button-height;
    border: none;
    outline: none;
    /* @alternate */
    line-height: inherit;
    user-select: none;
    -webkit-appearance: none;
    overflow: hidden;
    vertical-align: middle;
  }

  &::-moz-focus-inner {
    @include mdc-feature-targets($feat-structure) {
      padding: 0;
      border: 0;
    }
  }

  // postcss-bem-linter: ignore
  &:active {
    @include mdc-feature-targets($feat-structure) {
      outline: none;
    }
  }

  &:hover {
    @include mdc-feature-targets($feat-structure) {
      cursor: pointer;
    }
  }

  &:disabled {
    @include mdc-feature-targets($feat-color) {
      @include mdc-theme-prop(background-color, transparent);

      color: $mdc-button-disabled-ink-color;
    }

    @include mdc-feature-targets($feat-structure) {
      cursor: default;
      pointer-events: none;
    }
  }
}

@mixin mdc-button__icon_ {
  @include mdc-rtl-reflexive-box(margin, right, 8px);

  display: inline-block;
  width: 18px;
  height: 18px;
  font-size: 18px;
  vertical-align: top;
}

@mixin mdc-button__icon-trailing_ {
  @include mdc-rtl-reflexive-box(margin, left, 8px);
}

@mixin mdc-button__icon-svg_ {
  fill: currentColor;
}

@mixin mdc-button__icon-contained_ {
  @include mdc-rtl-reflexive-property(margin, -4px, 8px);
}

@mixin mdc-button__icon-contained-trailing_ {
  @include mdc-rtl-reflexive-property(margin, 8px, -4px);
}

@mixin mdc-button--outlined_($query) {
  $feat-color: mdc-feature-create-target($query, color);
  $feat-structure: mdc-feature-create-target($query, structure);

  @include mdc-feature-targets($feat-structure) {
    border-style: solid;
  }

  &:disabled {
    @include mdc-feature-targets($feat-color) {
      border-color: $mdc-button-disabled-ink-color;
    }
  }
}

@mixin mdc-button--filled_($query) {
  $feat-color: mdc-feature-create-target($query, color);
  $feat-structure: mdc-feature-create-target($query, structure);

  @include mdc-button-horizontal-padding($mdc-button-contained-horizontal-padding, $query);

  &:disabled {
    @include mdc-feature-targets($feat-color) {
      background-color: rgba(mdc-theme-prop-value(on-surface), .12);
      color: $mdc-button-disabled-ink-color;
    }
  }
}

@mixin mdc-button--raised_($query) {
  $feat-animation: mdc-feature-create-target($query, animation);
  $feat-color: mdc-feature-create-target($query, color);

  @include mdc-elevation(2, $query: $query);

  &:hover,
  &:focus {
    @include mdc-elevation(4, $query: $query);
  }

  &:active {
    @include mdc-elevation(8, $query: $query);
  }

  &:disabled {
    @include mdc-elevation(0, $query: $query);
  }

  @include mdc-feature-targets($feat-animation) {
    transition: mdc-elevation-transition-value();
  }
}

@mixin mdc-button--dense_() {
  height: $mdc-dense-button-height;
  font-size: .8125rem; // 13sp
}