84 lines
2.3 KiB
TypeScript
84 lines
2.3 KiB
TypeScript
import React, { useState, useCallback } from 'react';
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import ReactFlow, {
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removeElements,
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addEdge,
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Background,
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MiniMap,
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useZoomPanHelper,
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ReactFlowProvider,
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Elements,
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ElementId,
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Connection,
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Edge,
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} from 'react-flow-renderer';
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const initialElements: Elements = [
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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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{ id: '4', data: { label: 'Node 4' }, position: { x: 400, y: 200 }, className: 'light' },
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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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let id = 5;
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const getId = (): ElementId => `${id++}`;
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const UseZoomPanHelperFlow = () => {
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const [elements, setElements] = useState<Elements>(initialElements);
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const onElementsRemove = (elementsToRemove: Elements) => setElements((els) => removeElements(elementsToRemove, els));
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const onConnect = (params: Connection | Edge) => setElements((els) => addEdge(params, els));
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const { project, setCenter, zoomIn, zoomOut } = useZoomPanHelper();
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const onPaneClick = useCallback(
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(evt) => {
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const projectedPosition = project({ x: evt.clientX, y: evt.clientY - 40 });
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setElements((els) =>
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els.concat({
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id: getId(),
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position: projectedPosition,
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data: {
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label: `${projectedPosition.x}-${projectedPosition.y}`,
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},
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})
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);
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},
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[project]
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);
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const onElementClick = useCallback(
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(_, element) => {
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const { x, y } = element.position;
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setCenter(x, y, 1);
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},
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[setCenter]
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);
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return (
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<ReactFlow
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elements={elements}
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onElementClick={onElementClick}
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onElementsRemove={onElementsRemove}
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onConnect={onConnect}
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onPaneClick={onPaneClick}
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>
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<div style={{ position: 'absolute', left: 0, top: 0, zIndex: 100 }}>
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<button onClick={() => zoomIn(1200)}>zoomIn</button>
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<button onClick={() => zoomOut(0)}>zoomOut</button>
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</div>
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<Background />
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<MiniMap />
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</ReactFlow>
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);
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};
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const WrappedFlow = () => (
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<ReactFlowProvider>
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<UseZoomPanHelperFlow />
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</ReactFlowProvider>
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);
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export default WrappedFlow;
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