63 lines
1.8 KiB
JavaScript
63 lines
1.8 KiB
JavaScript
import React, { useState } from 'react';
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import ReactFlow, { ReactFlowProvider, addEdge, removeElements, Controls } from 'react-flow-renderer';
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import Sidebar from './Sidebar';
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import './dnd.css';
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const initialElements = [{ id: '1', type: 'input', data: { label: 'input node' }, position: { x: 250, y: 5 } }];
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let id = 0;
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const getId = () => `dndnode_${id++}`;
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const DnDFlow = () => {
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const [reactFlowInstance, setReactFlowInstance] = useState(null);
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const [elements, setElements] = useState(initialElements);
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const onConnect = (params) => setElements((els) => addEdge(params, els));
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const onElementsRemove = (elementsToRemove) => setElements((els) => removeElements(elementsToRemove, els));
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const onLoad = (_reactFlowInstance) => setReactFlowInstance(_reactFlowInstance);
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const onDragOver = (event) => {
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event.preventDefault();
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event.dataTransfer.dropEffect = 'move';
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};
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const onDrop = (event) => {
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event.preventDefault();
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const type = event.dataTransfer.getData('application/reactflow');
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const position = reactFlowInstance.project({ x: event.clientX, y: event.clientY - 40 });
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const newNode = {
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id: getId(),
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type,
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position,
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data: { label: `${type} node` },
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};
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setElements((es) => es.concat(newNode));
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};
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return (
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<div className="dndflow">
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<ReactFlowProvider>
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<div className="reactflow-wrapper">
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<ReactFlow
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elements={elements}
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onConnect={onConnect}
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onElementsRemove={onElementsRemove}
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onLoad={onLoad}
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onDrop={onDrop}
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onDragOver={onDragOver}
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>
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<Controls />
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</ReactFlow>
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</div>
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<Sidebar />
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</ReactFlowProvider>
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</div>
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);
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};
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export default DnDFlow;
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