Editing Restrictions

import React from 'react'; import Diagram, { CustomShape, Nodes, AutoLayout, ContextToolbox, Toolbox, PropertiesPanel, Group } from 'devextreme-react/diagram'; import notify from 'devextreme/ui/notify'; import ArrayStore from 'devextreme/data/array_store'; import service from './data.js'; class App extends React.Component { constructor(props) { super(props); this.diagramRef = React.createRef(); this.orgItemsDataSource = new ArrayStore({ key: 'ID', data: service.getOrgItems() }); this.onRequestEditOperation = this.onRequestEditOperation.bind(this); this.onRequestLayoutUpdate = this.onRequestLayoutUpdate.bind(this); } render() { return ( <Diagram id="diagram" ref={this.diagramRef} onRequestEditOperation={this.onRequestEditOperation} onRequestLayoutUpdate={this.onRequestLayoutUpdate}> <CustomShape category="items" type="root" baseType="octagon" defaultText="Development" /> <CustomShape category="items" type="team" baseType="ellipse" title="Team" defaultText="Team Name" /> <CustomShape category="items" type="employee" baseType="rectangle" title="Employee" defaultText="Employee Name" /> <Nodes dataSource={this.orgItemsDataSource} keyExpr="ID" textExpr="Name" typeExpr="Type" parentKeyExpr="ParentID"> <AutoLayout type="tree" /> </Nodes> <ContextToolbox shapeIconsPerRow={2} width={100} shapes={['team', 'employee']}> </ContextToolbox> <Toolbox shapeIconsPerRow={2}> <Group title="Items" shapes={['team', 'employee']} /> </Toolbox> <PropertiesPanel visibility="disabled"> </PropertiesPanel> </Diagram> ); } showToast(text) { notify({ position: { at: 'top', my: 'top', of: '#diagram', offset: '0 4' }, message: text, type: 'warning', delayTime: 2000 }); } onRequestLayoutUpdate(e) { for(var i = 0; i < e.changes.length; i++) { if(e.changes[i].type === 'remove') { e.allowed = true; } else if(e.changes[i].data.ParentID !== undefined && e.changes[i].data.ParentID !== null) { e.allowed = true; } } } onRequestEditOperation(e) { var diagram = this.diagramRef.current.instance; if(e.operation === 'addShape') { if(e.args.shape.type !== 'employee' && e.args.shape.type !== 'team') { if(e.reason !== 'checkUIElementAvailability') { this.showToast('You can add only a \'Team\' or \'Employee\' shape.'); } e.allowed = false; } } else if(e.operation === 'deleteShape') { if(e.args.shape.type === 'root') { if(e.reason !== 'checkUIElementAvailability') { this.showToast('You cannot delete the \'Development\' shape.'); } e.allowed = false; } if(e.args.shape.type === 'team') { for(var i = 0; i < e.args.shape.attachedConnectorIds.length; i++) { if(diagram.getItemById(e.args.shape.attachedConnectorIds[i]).toId != e.args.shape.id) { if(e.reason !== 'checkUIElementAvailability') { this.showToast('You cannot delete a \'Team\' shape that has a child shape.'); } e.allowed = false; break; } } } } else if(e.operation === 'resizeShape') { if(e.args.newSize.width < 1 || e.args.newSize.height < 0.75) { if(e.reason !== 'checkUIElementAvailability') { this.showToast('The shape size is too small.'); } e.allowed = false; } } else if(e.operation === 'changeConnection') { var shapeType = e.args.newShape && e.args.newShape.type; if(shapeType === 'root' && e.args.connectorPosition === 'end') { if(e.reason !== 'checkUIElementAvailability') { this.showToast('The \'Development\' shape cannot have an incoming connection.'); } e.allowed = false; } if(shapeType === 'employee' && e.args.connectorPosition === 'start') { e.allowed = false; } } else if(e.operation === 'changeConnectorPoints') { if(e.args.newPoints.length > 2) { if(e.reason !== 'checkUIElementAvailability') { this.showToast('You cannot add points to a connector.'); } e.allowed = false; } } else if(e.operation === 'beforeChangeShapeText') { if(e.args.shape.type === 'root') { if(e.reason !== 'checkUIElementAvailability') { this.showToast('You cannot change the \'Development\' shape\'s text.'); } e.allowed = false; } } else if(e.operation === 'changeShapeText') { if(e.args.text === '') { if(e.reason !== 'checkUIElementAvailability') { this.showToast('A shape text cannot be empty.'); } e.allowed = false; } } else if(e.operation === 'beforeChangeConnectorText') { e.allowed = false; } } } export default App;