Select

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

declare global {
  interface HTMLElementTagNameMap {
    'slab-styled-select': StyledSelect;
  }
}

/**
 * Select, styled: Text Field's box with a chevron that turns over when it
 * opens, and its Options in a panel that casts a hard shadow.
 */
@customElement('slab-styled-select')
export default class StyledSelect extends Select {
  static override styles = [tokens, styles];
}

import { css } from 'lit';

export default css`
  :host {
    color: var(--ink);
    display: grid;
    font-family: var(--font-body);
  }

  [part~='label'] {
    font-family: var(--font-display);
    font-size: 1.0625rem;
    font-weight: 600;
    margin-block-end: 0.375rem;
  }

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

  [part~='combobox'] {
    align-items: center;
    background-color: var(--paper);
    border: var(--border);
    box-sizing: border-box;
    cursor: pointer;
    display: flex;
    gap: 0.75rem;
    justify-content: space-between;

    /*
      A fixed height, shared with Text Field, so fields and the controls
      beside them line up whatever the font.
    */
    min-block-size: 3rem;
    padding: 0 0.75rem;
    transition:
      border-color 100ms,
      box-shadow 100ms;

    /* The chevron: a corner of border, turned. */
    &::after {
      block-size: 0.5rem;
      border-block-end: 2px solid currentcolor;
      border-inline-end: 2px solid currentcolor;
      content: '';
      flex-shrink: 0;
      inline-size: 0.5rem;
      rotate: 45deg;
      transition: rotate 150ms;
      translate: 0 -0.125rem;
    }

    /*
      Shadows only, without Text Field's lift. The combobox anchors the
      popover, and the popover would move with it.
    */
    &:focus-visible {
      box-shadow: 4px 4px 0 var(--ember);
      outline: 2px solid transparent;
    }
  }

  :host(:state(open)) [part~='combobox'] {
    box-shadow: var(--shadow);

    &::after {
      rotate: 225deg;
      translate: 0 0.125rem;
    }

    &:focus-visible {
      box-shadow: 4px 4px 0 var(--ember);
    }
  }

  :host(:state(placeholder-shown)) [part~='value'] {
    color: var(--ash);
  }

  :host(:state(error)) [part~='combobox'] {
    border-color: var(--ember-deep);
  }

  :host(:state(disabled)) [part~='combobox'] {
    background-color: var(--chalk);
    border-style: dashed;
    color: var(--ash);
    cursor: not-allowed;
  }

  /* A closed popover isn't displayed, so this runs each time it opens. */
  [part~='popover'] {
    animation: drop 150ms ease-out;
    background-color: var(--paper);
    border: var(--border);
    box-shadow: var(--shadow);
    box-sizing: border-box;
    color: var(--ink);
    margin-block: 0.5rem;
    max-block-size: 18rem;
    min-inline-size: anchor-size(inline);
    overflow-y: auto;
    padding: 0.25rem 0;
  }

  /*
    Spaced by what's in it rather than by a gap, so a description with
    nothing in it takes no room, and a control beside the field lines up
    with its bottom edge.
  */
  [part~='description'] {
    color: var(--ash);
    display: grid;
    font-size: 0.875rem;
  }

  ::slotted([slot='description']) {
    margin-block-start: 0.375rem;
  }

  [part~='validity-message'] {
    color: var(--ember-deep);
    font-weight: 600;
    margin-block-start: 0.375rem;

    &::before {
      content: '■ ' / '';
    }
  }

  @keyframes drop {
    from {
      opacity: 0;
      translate: 0 -0.375rem;
    }
  }

  @media (prefers-reduced-motion: reduce) {
    [part~='combobox'],
    [part~='combobox']::after {
      transition: none;
    }

    [part~='popover'] {
      animation: 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);
  }
`;