overleaf/services/web/frontend/js/features/source-editor/extensions/breadcrumbs-panel.ts

import { EditorView } from '@codemirror/view'

/**
 * A panel which contains the editor breadcrumbs
 */
export function breadcrumbPanel() {
  return [
    EditorView.editorAttributes.of({
      style: '--breadcrumbs-height: 28px;',
    }),
    EditorView.baseTheme({
      '.ol-cm-breadcrumbs-portal': {
        display: 'flex',
        pointerEvents: 'none !important',
        '& > *': {
          pointerEvents: 'all',
        },
      },
      '.ol-cm-breadcrumbs': {
        height: 'var(--breadcrumbs-height)',
        flex: 1,
        display: 'flex',
        alignItems: 'center',
        gap: 'var(--spacing-01)',
        fontSize: 'var(--font-size-01)',
        padding: 'var(--spacing-02)',
        overflow: 'auto',
        scrollbarWidth: 'thin',
        '& > *': {
          flexShrink: '0',
        },
      },
      '&light .ol-cm-breadcrumb-chevron': {
        color: 'var(--neutral-30)',
      },
      '&dark .ol-cm-breadcrumb-chevron': {
        color: 'var(--neutral-50)',
      },
    }),
  ]
}