@vaadin/vaadin-lumo-styles/src/components/grid-tree-toggle.css

Lumo is a design system foundation for modern web applications, used by Vaadin components

/**
 * @license
 * Copyright (c) 2000 - 2026 Vaadin Ltd.
 * This program is available under Apache License Version 2.0, available at https://vaadin.com/license/
 */
@media lumo_components_grid-tree-toggle {
  :host {
    --vaadin-grid-tree-toggle-level-offset: 2em;
    display: inline-flex;
    max-width: 100%;
    align-items: center;
    vertical-align: middle;
    transform: translateX(calc(var(--lumo-space-s) * -1));
    -webkit-tap-highlight-color: transparent;
  }

  :host([hidden]) {
    display: none !important;
  }

  :host(:not([leaf])) {
    cursor: default;
  }

  #level-spacer,
  [part='toggle'] {
    flex: none;
  }

  #level-spacer {
    display: inline-block;
    width: calc(var(--_level, '0') * var(--vaadin-grid-tree-toggle-level-offset));
  }

  [part='toggle']::before {
    line-height: 1em; /* make icon font metrics not affect baseline */
    font-family: 'lumo-icons';
    display: inline-block;
    height: 100%;
  }

  :host(:not([expanded])) [part='toggle']::before {
    content: var(--lumo-icons-angle-right);
  }

  :host([expanded]) [part='toggle']::before {
    content: var(--lumo-icons-angle-right);
    transform: rotate(90deg);
  }

  :host([leaf]) [part='toggle'] {
    visibility: hidden;
  }

  slot {
    display: block;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  [part='toggle'] {
    display: inline-block;
    font-size: 1.5em;
    line-height: 1;
    width: 1em;
    height: 1em;
    text-align: center;
    color: var(--lumo-contrast-50pct);
    cursor: var(--lumo-clickable-cursor);
    /* Increase touch target area */
    padding: calc(1em / 3);
    margin: calc(1em / -3);
  }

  :host(:not([dir='rtl'])) [part='toggle'] {
    margin-right: 0;
  }

  @media (hover: hover) {
    :host(:hover) [part='toggle'] {
      color: var(--lumo-contrast-80pct);
    }
  }

  /* RTL specific styles */

  :host([dir='rtl']) {
    margin-left: 0;
    margin-right: calc(var(--lumo-space-s) * -1);
  }

  :host([dir='rtl']) [part='toggle'] {
    margin-left: 0;
  }

  :host([dir='rtl'][expanded]) [part='toggle']::before {
    transform: rotate(-90deg);
  }

  :host([dir='rtl']:not([expanded])) [part='toggle']::before,
  :host([dir='rtl'][expanded]) [part='toggle']::before {
    content: var(--lumo-icons-angle-left);
  }
}