@aspicio/react

React bindings for the Aspicio DXF and PDF viewer — thin, API-stable veneers over the framework-neutral @aspicio/elements web components, so React, Vue, Svelte, and plain-HTML embeds share one implementation and one look. Try the viewer live at aspicio.frontsail.app.

npm install @aspicio/react react three   # @aspicio/core comes along; react 18/19 and three (>=0.184) are peers

• <AspicioEmbed> — batteries included: layer list + interactive preview in one component.
• <AspicioPreview> — the embeddable canvas alone: pan/zoom/rotate (mouse and multi-touch), animated fit, batched WebGL rendering. No chrome. Pass onHoverLayer to hit-test the layer under the cursor.
• <AspicioLayerPanel> — the ready-made layer list, identical to the demo app: header with layer count, visibility checkboxes, effective-color swatches, entity counts, hover-to-highlight, double-click-to-solo (with a banner), and a gesture-hints footer. theme="none" renders a minimal unstyled list.

One component

import { AspicioEmbed } from "@aspicio/react";
import "@aspicio/react/formats/dxf";

// file: File | Blob | ArrayBuffer | string (DXF text) — or use srcUrl
<AspicioEmbed src={file} style={{ height: 480 }} />;

Props: panel="left" | "right" | "none", panelStyle, options, onLoaded, onError, plus a ref exposing the full DrawingViewer.

Theming

AspicioEmbed and AspicioLayerPanel ship with the Aspicio demo look by default — dark panel, blueprint grid behind a transparent canvas, hover states. Pass theme="none" to drop the chrome for a minimal structure.

The internals render in shadow DOM (host CSS can't accidentally restyle them), so deliberate theming goes through the elements' hooks: set --aspicio-* CSS custom properties on the component (or any ancestor) to change tokens, target ::part(...) names for structural styling, and use panelStyle for inline styles on the panel. panelClassName is deprecated — a class on a shadow-DOM child is unreachable from page CSS. See the @aspicio/elements README for the full token and part list.

The theme uses IBM Plex font stacks but never loads webfonts itself (no surprise network requests from a library). Load IBM Plex Sans/Mono in your page for the exact demo typography; otherwise system faces are used. The raw tokens are exported as aspicioTokens if you want to match the palette elsewhere.

Custom layout

import { useRef, useState } from "react";
import type { DrawingViewer } from "@aspicio/core";
import { AspicioLayerPanel, AspicioPreview } from "@aspicio/react";

export function DrawingPage({ url }: { url: string }) {
  const viewerRef = useRef<DrawingViewer>(null);
  const [viewer, setViewer] = useState<DrawingViewer | null>(null);

  return (
    <div style={{ display: "flex", height: 480 }}>
      <AspicioLayerPanel viewer={viewer} style={{ width: 220 }} />
      <AspicioPreview
        ref={viewerRef}
        srcUrl={url}
        options={{ background: 0x16181d }}
        onViewer={setViewer}
        onLoaded={({ stats }) => console.log(stats)}
        onError={(error) => console.error(error)}
      />
    </div>
  );
}

Notes:

• The viewer instance (via ref or onViewer) is the full @aspicio/core API — fitView, zoomBy, resetRotation, setLayerVisible, setLayerHighlight, pickLayer, view, stats.
• src accepts DXF text, File, Blob, or ArrayBuffer; srcUrl fetches. Changing either loads the new document; stale in-flight loads are ignored.
• A built-in Download control (SVG / PNG export) shows by default; pass showDownload={false} to hide it. The viewer's toSVG() / toPNG() stay callable via the ref regardless.
• shortcuts (default off) enables keyboard control on the focused embed: F fit, +/- zoom, R reset rotation, A show all layers. Click the embed to focus it — keys are scoped to the focused container so multiple embeds on a page don't collide. See apps/react-example for a full setup.
• Camera state is deliberately not React state — subscribe to the render event on the viewer if you need to display it.
• Shareable/deep-linked views: the embed doesn't touch the URL itself. Read viewer.view (+ getLayers()) on render to serialize a pose into your router, and viewer.setView(saved) after onLoaded to restore it. Since a fixed srcUrl already identifies the drawing, this gives embedders "open at this view" links. The demo's viewurl.ts is a full reference.
• StrictMode and SSR safe: the viewer is created only after mount (the underlying elements are import-safe in Node) and disposed on unmount.

Migrating from 0.x

Two breaking changes ship together:

1. Formats are opted into by import. Add import "@aspicio/react/formats/dxf"; once — without it every load fails with an error saying exactly that.
2. Format-neutral names dropped their Dxf prefix: <DxfEmbed> / <DxfPreview> / <DxfLayerPanel> → <AspicioEmbed> / <AspicioPreview> / <AspicioLayerPanel>, DxfTheme → AspicioTheme, and DxfViewer → DrawingViewer.