Checkbox

import { customElement } from 'lit/decorators.js';
import Checkbox from 'slab-elements/checkbox.js';
import styles from './checkbox.styles.js';
import tokens from './tokens.styles.js';

declare global {
  interface HTMLElementTagNameMap {
    'slab-styled-checkbox': StyledCheckbox;
  }
}

/**
 * Checkbox, styled: a square box that fills with ember when checked, with a
 * check or a dash drawn on it in paper.
 */
@customElement('slab-styled-checkbox')
export default class StyledCheckbox extends Checkbox {
  static override styles = [tokens, styles];
}

import { css } from 'lit';

export default css`
  :host {
    align-items: center;
    color: var(--ink);
    column-gap: 0.75rem;
    display: grid;
    font-family: var(--font-body);
    grid-template-columns: auto 1fr;
  }

  :host(:state(disabled)) {
    color: var(--ash);
  }

  [part~='checkbox'] {
    display: grid;
    position: relative;
  }

  [part~='input'] {
    appearance: none;
    background-color: var(--paper);
    block-size: 1.375rem;
    border: var(--border);
    cursor: pointer;
    inline-size: 1.375rem;
    margin: 0;
    transition:
      background-color 100ms,
      box-shadow 100ms;

    &:hover {
      box-shadow: 2px 2px 0 var(--ink);
    }

    &:focus-visible {
      outline: 3px solid var(--ember);
      outline-offset: 2px;
    }

    &:disabled {
      border-style: dashed;
      box-shadow: none;
      cursor: not-allowed;
      opacity: 0.5;
    }
  }

  :host(:state(checked)) [part~='input'],
  :host(:state(indeterminate)) [part~='input'] {
    background-color: var(--ember);
  }

  :host(:state(error)) [part~='input'] {
    border-color: var(--ember-deep);
    box-shadow: 2px 2px 0 var(--ember-deep);
  }

  /*
    The mark is a shape cut from paper with a mask, so it takes the theme's
    color. It's drawn on rather than shown: a clip slides off it from left to
    right, the way Glide Core's stroke draws on. Unchecking takes it away at
    once. It doesn't take clicks, so the input under it still does.
  */
  [part~='checkbox']::after {
    background-color: var(--paper);
    clip-path: inset(0 100% 0 0);
    content: '';
    inset: 2px;
    mask: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3 8.25l3.25 3.25L13 4.5' fill='none' stroke='black' stroke-width='2.5'/%3E%3C/svg%3E")
      center / contain no-repeat;
    pointer-events: none;
    position: absolute;
  }

  :host(:state(checked)) [part~='checkbox']::after,
  :host(:state(indeterminate)) [part~='checkbox']::after {
    clip-path: inset(0);
    transition: clip-path 300ms cubic-bezier(0.32, 0, 0.67, 0);
  }

  :host(:state(indeterminate)) [part~='checkbox']::after {
    mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Cpath d='M3.5 8h9' fill='none' stroke='black' stroke-width='2.5'/%3E%3C/svg%3E");
  }

  [part~='label'] {
    cursor: pointer;
  }

  :host(:state(required)) [part~='label']::after {
    color: var(--ember-deep);
    content: ' *' / '';
  }

  [part~='description'] {
    color: var(--ash);
    font-size: 0.875rem;
    grid-column: 2;
  }

  [part~='validity-message'] {
    color: var(--ember-deep);
    font-weight: 600;
  }

  @media (prefers-reduced-motion: reduce) {
    [part~='input'],
    :host(:state(checked)) [part~='checkbox']::after,
    :host(:state(indeterminate)) [part~='checkbox']::after {
      transition: none;
    }
  }
`;

import { css } from 'lit';

/*
  The styled components' palette and type, taken from the logo: ink for the
  courses, ember for the base, paper behind them.

  Each is a short alias for a "--slab-styled-*" property, with the default as
  its fallback. Retheming is "--slab-styled-ember" and the rest on ":root",
  which every shadow root inherits. Were the defaults declared under those
  names here instead, each host's own declaration would shadow the page's.

  Each default is "light-dark()", so the components follow the page's
  "color-scheme": "dark" for dark, "light" for light, and "light dark" to
  follow the operating system. Ink and paper trade places in the dark, so
  ink is always the text and paper always what's behind it. Contrast is given
  as light, then dark.
*/
export default css`
  :host {
    /* Secondary text. 6.8:1 and 6.9:1 on paper. */
    --ash: var(--slab-styled-ash, light-dark(#5e5a55, #a8a19a));
    --border: 2px solid var(--ink);

    /* Behind disabled and read-only controls, and hovered rows. */
    --chalk: var(--slab-styled-chalk, light-dark(#f4f1ec, #2b2926));

    /*
      The logo's orange, brighter in the dark. 4.25:1 and 5.2:1 on paper is
      enough for borders, fills and large text, but not always for small text,
      which takes "--ember-deep".
    */
    --ember: var(--slab-styled-ember, light-dark(#d9492a, #ec5f3b));

    /*
      Orange for small text on paper, and for paper text on it. 5.7:1 and
      7.4:1.
    */
    --ember-deep: var(--slab-styled-ember-deep, light-dark(#b3381a, #ff8566));
    --font-body: var(
      --slab-styled-font-body,
      'IBM Plex Sans',
      system-ui,
      sans-serif
    );
    --font-display: var(
      --slab-styled-font-display,
      'Zilla Slab',
      rockwell,
      'Roboto Slab',
      serif
    );
    --font-mono: var(
      --slab-styled-font-mono,
      'IBM Plex Mono',
      ui-monospace,
      monospace
    );
    --ink: var(--slab-styled-ink, light-dark(#1c1c1c, #f4f1ec));
    --paper: var(--slab-styled-paper, light-dark(#fff, #1a1918));

    /* The hard, offset shadow a raised surface casts. */
    --shadow: 4px 4px 0 var(--ink);
  }
`;