Tree

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

declare global {
  interface HTMLElementTagNameMap {
    'slab-styled-tree': StyledTree;
  }
}

/**
 * Tree, styled: its Tree Items in an ink-bordered box that casts an ember
 * shadow while it's focused.
 */
@customElement('slab-styled-tree')
export default class StyledTree extends Tree {
  static override styles = [tokens, styles];
}

import { css } from 'lit';

/*
  Focus stays on the tree and the active Tree Item shows where the keyboard
  is, so the tree's own focus is the shadow, as Listbox's is.
*/
export default css`
  [part~='tree'] {
    background-color: var(--paper);
    border: var(--border);
    color: var(--ink);
    font-family: var(--font-body);
    padding: 0.25rem 0;
    transition: box-shadow 100ms;

    &:focus-visible {
      box-shadow: 4px 4px 0 var(--ember);
      outline: 2px solid transparent;
    }

    @media (prefers-reduced-motion: reduce) {
      transition: none;
    }
  }
`;

import { customElement } from 'lit/decorators.js';
import TreeItem from 'slab-elements/tree.item.js';
import styles from './tree.item.styles.js';
import tokens from './tokens.styles.js';

declare global {
  interface HTMLElementTagNameMap {
    'slab-styled-tree-item': StyledTreeItem;
  }
}

/**
 * Tree Item, styled: a row with a chevron that turns down when it's
 * expanded, inverting to paper on ink while it's active, as Option does.
 * Its children are indented under a rule.
 */
@customElement('slab-styled-tree-item')
export default class StyledTreeItem extends TreeItem {
  static override styles = [tokens, styles];
}

import { css } from 'lit';

export default css`
  [part~='label'] {
    align-items: center;
    border-inline-start: 4px solid transparent;
    cursor: pointer;
    display: flex;
    gap: 0.5rem;
    padding: 0.375rem 0.75rem;
    transition:
      background-color 100ms,
      color 100ms;

    /*
      The chevron, a corner of border, turned to point at the children. A Tree
      Item with none keeps the room, so labels line up.
    */
    &::before {
      block-size: 0.4375rem;
      content: '';
      flex-shrink: 0;
      inline-size: 0.4375rem;
      rotate: -45deg;
      transition: rotate 150ms;
    }

    &:hover {
      background-color: var(--chalk);
    }
  }

  :host(:state(parent)) [part~='label']::before {
    border-block-end: 2px solid currentcolor;
    border-inline-end: 2px solid currentcolor;
  }

  :host(:state(expanded)) [part~='label']::before {
    rotate: 45deg;
  }

  :host(:state(selected)) [part~='label'] {
    border-inline-start-color: var(--ember);
    font-weight: 600;
  }

  /* After ":hover", which ":state(active)" wins over. */
  :host(:state(active)) [part~='label'] {
    background-color: var(--ink);
    color: var(--paper);
  }

  :host(:state(disabled)) [part~='label'] {
    color: var(--ash);
    cursor: not-allowed;
    text-decoration: line-through;
  }

  [part~='group'] {
    border-inline-start: 2px solid var(--chalk);
    margin-inline-start: 1.125rem;
  }

  @media (prefers-reduced-motion: reduce) {
    [part~='label'],
    [part~='label']::before {
      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);
  }
`;