@hlang-tech/editor-react
React bindings for Lumen, the hlang visual editor. The hooks connect a headless @hlang-tech/editor-core to React Flow. This package adds no styling; the design system is @hlang-tech/editor-ui.
Status: 0.x, in active development. The API can change in any minor release.
Install
npm install @hlang-tech/editor-react @hlang-tech/editor-core @xyflow/react react react-dom
The same build is published as @hlang-org/editor-react. Peer dependencies: react and react-dom 18 or later, @xyflow/react 12.
Usage
import { ReactFlow, ReactFlowProvider } from '@xyflow/react';
import '@xyflow/react/dist/style.css';
import { createEditorCore } from '@hlang-tech/editor-core';
import { useHlangFlow } from '@hlang-tech/editor-react';
const core = createEditorCore();
// register node descriptors and add nodes...
function Canvas() {
const flow = useHlangFlow(core);
return <ReactFlow {...flow} fitView />;
}
export function Editor() {
return (
<ReactFlowProvider>
<Canvas />
</ReactFlowProvider>
);
}
useHlangFlow returns nodes, edges, onNodesChange, onEdgesChange, onConnect, and isValidConnection. Spread them into <ReactFlow>.
How the binding works
- Direction. An output (O) port is a React Flow
source/sourceHandle; an input (I) port is atarget/targetHandle.isValidConnectionasks the core's validator, so invalid links are refused while dragging. - Commands. Connecting, deleting, moving, and renaming are executed as core commands, so every canvas edit can be undone.
- Dragging. Positions update locally while a node is dragged, and one move command is committed when the drag ends. Undo and redo move nodes on the canvas.
- Subscriptions. Hooks read the core through
useSyncExternalStoreand re-render only when the relevant core events fire.
Hooks
| Hook | Returns |
|---|---|
useHlangFlow(core) | Props for <ReactFlow>, as above. |
useGraphSync(core) | The current nodes and edges of the model. |
useConnect(core), useIsValidConnection(core) | The connect handler and the validation callback. |
useNodeChanges, useEdgeChanges | React Flow change handlers that commit to the core. |
useHistory(core) | canUndo, canRedo, undo, redo. |
useSelection(core) | Selected node and edge ids, with selection setters. |
useViewState(core) | Hidden and locked node flags, with setters and toggles. |
useClipboard(core) | Copy, cut, paste, and duplicate of the selection, including the system clipboard. |
useRename(core) | Rename a node through a command. |
useDiagnostics(core) | The core's edit-time diagnostics, also grouped by node. |
useReconnect(core) | Move an edge endpoint to another port, and find the edge under a dragged node for drop-to-insert. |
EditorProvider and useEditor share one core through React context. The mapping helpers toRFNode, toRFEdge, endpointsFromConnection, and findPort are exported for custom bindings.
Source and documentation: github.com/hlang-tech/hlang.
License
MIT