signal-desktop/stylesheets/components/Button.scss

// Copyright 2021 Signal Messenger, LLC
// SPDX-License-Identifier: AGPL-3.0-only

.module-Button {
  @mixin focus-box-shadow($inner-color, $outer-color) {
    &:focus {
      box-shadow: 0 0 0 1px $inner-color, 0 0 0 4px $outer-color;
    }
  }

  @mixin hover-and-active-states($background-color, $mix-color) {
    &:hover:not(:disabled) {
      background: mix($background-color, $mix-color, 85%);
    }
    &:active:not(:disabled) {
      background: mix($background-color, $mix-color, 75%);
    }
  }

  @include button-reset;
  border-radius: 4px;
  padding: 8px 16px;
  text-align: center;
  user-select: none;

  @include keyboard-mode {
    @include focus-box-shadow($color-white, $ultramarine-ui-light);
  }

  @include dark-keyboard-mode {
    @include focus-box-shadow($color-black, $ultramarine-brand-light);
  }

  &:disabled {
    cursor: not-allowed;
  }

  &--medium {
    @include font-body-1-bold;
  }

  &--small {
    @include font-body-2;
    @include rounded-corners;
    padding: 6px 12px;
  }

  &--primary {
    $color: $color-white;
    $background-color: $ultramarine-ui-light;

    color: $color;
    background: $background-color;

    &:disabled {
      color: fade-out($color, 0.4);
      background: fade-out($background-color, 0.6);
    }

    @include light-theme {
      @include hover-and-active-states($background-color, $color-black);
    }

    @include dark-theme {
      @include hover-and-active-states($background-color, $color-white);
    }
  }

  &--secondary {
    @include light-theme {
      $color: $color-gray-90;
      $background-color: $color-gray-05;

      color: $color;
      background: $background-color;

      &:disabled {
        color: $color-black-alpha-40;
        background: fade-out($background-color, 0.6);
      }

      &--affirmative {
        color: $ultramarine-ui-light;
      }

      &--destructive {
        color: $color-accent-red;
      }

      @include hover-and-active-states($background-color, $color-black);
    }

    @include dark-theme {
      $color: $color-gray-05;
      $background-color: $color-gray-65;

      color: $color;
      background: $background-color;

      &:disabled {
        color: $color-white-alpha-20;
        background: fade-out($background-color, 0.6);
      }

      &--affirmative {
        color: $ultramarine-ui-dark;
      }

      &--destructive {
        color: $color-accent-red;
      }

      @include hover-and-active-states($background-color, $color-white);
    }
  }

  &--destructive {
    $color: $color-white;
    $background-color: $color-accent-red;

    color: $color;
    background: $background-color;

    &:disabled {
      color: fade-out($color, 0.4);
      background: fade-out($background-color, 0.6);
    }

    @include light-theme {
      @include hover-and-active-states($background-color, $color-black);
    }

    @include dark-theme {
      @include hover-and-active-states($background-color, $color-white);
    }
  }
}