135 lines
3.9 KiB
TypeScript
135 lines
3.9 KiB
TypeScript
import { useState, MouseEvent, useCallback } from 'react';
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import ReactFlow, {
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addEdge,
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Background,
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applyNodeChanges,
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applyEdgeChanges,
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MiniMap,
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Controls,
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Node,
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Edge,
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NodeChange,
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EdgeChange,
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OnLoadParams,
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Connection,
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} from 'react-flow-renderer';
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const onNodeDragStop = (_: MouseEvent, node: Node) => console.log('drag stop', node);
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const onNodeClick = (_: MouseEvent, node: Node) => console.log('click', node);
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const onEdgeClick = (_: MouseEvent, edge: Edge) => console.log('click', edge);
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const initialNodes: Node[] = [
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{ id: '1', type: 'input', data: { label: 'Node 1' }, position: { x: 250, y: 5 }, className: 'light' },
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{ id: '2', data: { label: 'Node 2' }, position: { x: 100, y: 100 }, className: 'light' },
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{ id: '3', data: { label: 'Node 3' }, position: { x: 400, y: 100 }, className: 'light' },
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{
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id: '4',
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data: { label: 'Node 4' },
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position: { x: 400, y: 200 },
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className: 'light',
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style: { backgroundColor: 'rgba(255, 0, 0, .2)' },
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childNodes: [
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{ id: '4a', data: { label: 'Node 4a' }, position: { x: 400, y: 400 }, className: 'light' },
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{
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id: '4b',
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data: { label: 'Node 4b' },
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position: { x: 500, y: 500 },
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className: 'light',
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style: { backgroundColor: 'rgba(255, 0, 0, .2)' },
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childNodes: [
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{ id: '4b1', data: { label: 'Node 4b1' }, position: { x: 450, y: 450 }, className: 'light' },
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{ id: '4b2', data: { label: 'Node 4b2' }, position: { x: 550, y: 550 }, className: 'light' },
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],
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},
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],
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},
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];
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const initialEdges: Edge[] = [
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{ id: 'e1-2', source: '1', target: '2', animated: true },
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{ id: 'e1-3', source: '1', target: '3' },
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];
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const BasicFlow = () => {
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const [rfInstance, setRfInstance] = useState<OnLoadParams | null>(null);
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const [nodes, setNodes] = useState<Node[]>(initialNodes);
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const [edges, setEdges] = useState<Edge[]>(initialEdges);
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const onConnect = useCallback((params: Edge | Connection) => {
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setEdges((eds) => addEdge(params, eds));
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}, []);
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const onLoad = useCallback((reactFlowInstance: OnLoadParams) => setRfInstance(reactFlowInstance), []);
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const updatePos = () => {
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setNodes((nds) => {
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return nds.map((n) => {
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n.position = {
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x: Math.random() * 400,
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y: Math.random() * 400,
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};
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return n;
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});
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});
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};
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const logToObject = () => console.log(rfInstance?.toObject());
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const resetTransform = () => rfInstance?.setTransform({ x: 0, y: 0, zoom: 1 });
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const toggleClassnames = () => {
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setNodes((nds) => {
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return nds.map((n) => {
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n.className = n.className === 'light' ? 'dark' : 'light';
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return n;
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});
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});
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};
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const onNodesChange = useCallback((changes: NodeChange[]) => {
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setNodes((ns) => applyNodeChanges(changes, ns));
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}, []);
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const onEdgesChange = useCallback((changes: EdgeChange[]) => {
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setEdges((es) => applyEdgeChanges(changes, es));
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}, []);
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return (
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<ReactFlow
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nodes={nodes}
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edges={edges}
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onLoad={onLoad}
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onNodesChange={onNodesChange}
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onEdgesChange={onEdgesChange}
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onNodeClick={onNodeClick}
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onEdgeClick={onEdgeClick}
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onConnect={onConnect}
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onNodeDragStop={onNodeDragStop}
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className="react-flow-basic-example"
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defaultZoom={1.5}
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minZoom={0.2}
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maxZoom={4}
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>
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<MiniMap />
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<Controls />
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<Background />
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<div style={{ position: 'absolute', right: 10, top: 10, zIndex: 4 }}>
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<button onClick={resetTransform} style={{ marginRight: 5 }}>
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reset transform
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</button>
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<button onClick={updatePos} style={{ marginRight: 5 }}>
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change pos
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</button>
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<button onClick={toggleClassnames} style={{ marginRight: 5 }}>
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toggle classnames
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</button>
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<button onClick={logToObject}>toObject</button>
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</div>
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</ReactFlow>
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);
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};
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export default BasicFlow;
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