Custom Drag & Drop

import React from 'react'; import Scheduler, { AppointmentDragging } from 'devextreme-react/scheduler'; import Draggable from 'devextreme-react/draggable'; import ScrollView from 'devextreme-react/scroll-view'; import { appointments, tasks } from './data.js'; const currentDate = new Date(2021, 3, 26); const views = [{ type: 'day', intervalCount: 3 }]; const draggingGroupName = 'appointmentsGroup'; class App extends React.Component { constructor(props) { super(props); this.state = { tasks, appointments, }; this.onAppointmentRemove = this.onAppointmentRemove.bind(this); this.onAppointmentAdd = this.onAppointmentAdd.bind(this); } render() { return ( <React.Fragment> <ScrollView id="scroll"> <Draggable id="list" data="dropArea" group={draggingGroupName} onDragStart={this.onListDragStart}> {this.state.tasks.map((task) => <Draggable key={task.text} className="item dx-card dx-theme-text-color dx-theme-background-color" clone={true} group={draggingGroupName} data={task} onDragStart={this.onItemDragStart} onDragEnd={this.onItemDragEnd}> {task.text} </Draggable>)} </Draggable> </ScrollView> <Scheduler timeZone="America/Los_Angeles" id="scheduler" dataSource={this.state.appointments} views={views} defaultCurrentDate={currentDate} height={600} startDayHour={9} editing={true}> <AppointmentDragging group={draggingGroupName} onRemove={this.onAppointmentRemove} onAdd={this.onAppointmentAdd} /> </Scheduler> </React.Fragment> ); } onAppointmentRemove(e) { const index = this.state.appointments.indexOf(e.itemData); if (index >= 0) { this.state.appointments.splice(index, 1); this.state.tasks.push(e.itemData); this.setState({ tasks: [...this.state.tasks], appointments: [...this.state.appointments], }); } } onAppointmentAdd(e) { const index = this.state.tasks.indexOf(e.fromData); if (index >= 0) { this.state.tasks.splice(index, 1); this.state.appointments.push(e.itemData); this.setState({ tasks: [...this.state.tasks], appointments: [...this.state.appointments], }); } } onListDragStart(e) { e.cancel = true; } onItemDragStart(e) { e.itemData = e.fromData; } onItemDragEnd(e) { if (e.toData) { e.cancel = true; } } } export default App;