Accessibility Overview (React)

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import 'bootstrap.css';
import '@mescius/wijmo.styles/wijmo.css';
import ReactDOM from 'react-dom/client';
import React, { useRef, useState } from 'react';
import useEvent from 'react-use-event-hook';
import '@mescius/wijmo.chart.render';
import * as wjcCore from '@mescius/wijmo';
import * as wjcGrid from '@mescius/wijmo.react.grid';
import * as wjChart from '@mescius/wijmo.chart';
import * as wjChartModule from '@mescius/wijmo.react.chart';
import * as gridPdf from '@mescius/wijmo.grid.pdf';
import * as pdf from '@mescius/wijmo.pdf';
import './app.css';
import { getEmployee } from './data';
function App() {
    const [employee, setEmployee] = useState(getEmployee());
    const [totals, setTotals] = useState([
        { name: 'Hotel', value: employee.expenses.totals.hotel },
        { name: 'Transport', value: employee.expenses.totals.transport },
        { name: 'Meal', value: employee.expenses.totals.meal },
        { name: 'Fuel', value: employee.expenses.totals.fuel },
        { name: 'Misc', value: employee.expenses.totals.misc }
    ]);
    const flexGridRef = useRef(null);
    const flexPieRef = useRef(null);
    const employeeRef = useRef(null);
    const initializeGrid = useEvent((ctl) => {
        flexGridRef.current = ctl;
    });
    const initializePie = useEvent((ctl) => {
        flexPieRef.current = ctl;
    });
    const exportPDF = () => {
        let doc = new pdf.PdfDocument({
            info: {
                title: 'Expense Analysis Report'
            },
            tagged: true,
            displayTitle: true,
            lang: 'en-US',
            version: pdf.PdfVersion.v1_5,
            // The header will be automatically marked as a pagination artifact.
            header: {
                declarative: {
                    text: 'Expense Analysis Report',
                    font: new pdf.PdfFont('times', 12),
                    brush: '#bfc1c2'
                }
            },
            lineGap: 2,
            pageSettings: {
                margins: {
                    left: 12,
                    right: 12,
                    top: 12,
                    bottom: 12
                }
            },
            ended: (sender, args) => pdf.saveBlob(args.blob, 'FlexGrid.pdf')
        });
        drawText(doc);
        drawEmployee(doc, flexGridRef.current, flexPieRef.current, employee, () => {
            doc.artifact(() => drawWatermark(doc), { type: pdf.PdfArtifactType.Pagination });
            doc.end();
        });
    };
    const drawText = (doc) => {
        doc.addTag(doc.tag(pdf.PdfTagType.H1, () => {
            doc.drawText('What is an expense report?', undefined, undefined, {
                font: new pdf.PdfFont('times', 20, 'normal', 'bold')
            });
        }));
        //
        doc.addTag(doc.tag(pdf.PdfTagType.P, () => {
            doc.drawText(`An expense report is a form of document that contains all the expenses that an
individual has incurred as a result of the business operation. For example, if the owner of a business
travels to another location for a meeting, the cost of travel, the meals, and all other expenses that
he/she has incurred may be added to the expense report.`.replace(/\n/g, ''));
        }));
    };
    const drawEmployee = (doc, flexGrid, flexPie, employee, done) => {
        let expenses = employee.expenses.items.sort((a, b) => a.date.getTime() - b.date.getTime()), minDate = expenses[0].date, maxDate = expenses[expenses.length - 1].date, bold = new pdf.PdfFont('times', 10, 'normal', 'bold');
        //
        doc.moveDown(2);
        //
        doc.addTag(doc.tag(pdf.PdfTagType.P, () => {
            doc.drawText('Name: ', undefined, undefined, { font: bold, continued: true });
            doc.drawText(employee.name);
        }));
        //
        doc.addTag(doc.tag(pdf.PdfTagType.P, () => {
            doc.drawText('From: ', undefined, undefined, { font: bold, continued: true });
            doc.drawText(wjcCore.changeType(minDate, wjcCore.DataType.String, 'd'));
        }));
        //
        doc.addTag(doc.tag(pdf.PdfTagType.P, () => {
            doc.drawText('To: ', undefined, undefined, { font: bold, continued: true });
            doc.drawText(wjcCore.changeType(maxDate, wjcCore.DataType.String, 'd'));
        }));
        //
        doc.moveDown(2);
        let y = doc.y;
        //
        doc.addTag(doc.tag(pdf.PdfTagType.P, () => {
            doc.drawText('Expense details:', 0, y);
        }));
        y = doc.y;
        //
        gridPdf.FlexGridPdfConverter.draw(flexGrid, doc, doc.width * 0.5, undefined, {
            styles: {
                cellStyle: {
                    backgroundColor: '#ffffff',
                    borderColor: '#c6c6c6'
                },
                altCellStyle: {
                    backgroundColor: '#f9f9f9'
                },
                groupCellStyle: {
                    font: { weight: 'bold' },
                    backgroundColor: '#dddddd'
                },
                headerCellStyle: {
                    backgroundColor: '#eaeaea'
                }
            }
        });
        //
        flexPie.saveImageToDataUrl(wjChart.ImageFormat.Png, (url) => {
            doc.addTag(doc.tag(pdf.PdfTagType.Figure, [
                doc.tag(pdf.PdfTagType.Caption, () => {
                    doc.drawText('Total expenses by category:', doc.width * 0.5 + 20, y);
                }),
                () => {
                    doc.drawImage(url, doc.width * 0.5 + 20, doc.y, { width: doc.width * 0.5 - 20 });
                }
            ], { actual: 'The chart' }));
            // Finish the document.
            done();
        });
    };
    const drawWatermark = (doc) => {
        let docX = doc.x, docY = doc.y, font = new pdf.PdfFont('times', 120), color = wjcCore.Color.fromRgba(59, 59, 109, 0.05), pgc = new wjcCore.Point(doc.width / 2, doc.height / 2), text = 'Wijmo', offs = 10;
        //
        doc.x = 0;
        doc.y = 0;
        //
        let sz = doc.measureText(text, font), szCx = sz.size.width / 2, szCy = sz.size.height / 2;
        //
        doc.saveState();
        //
        doc.rotate(45, pgc);
        //
        doc.drawText(text, pgc.x - szCx, pgc.y - szCy, {
            font: font,
            brush: color,
            baseline: pdf.PdfTextBaseline.Top
        });
        //
        doc.paths
            .rect(pgc.x - szCx - offs, pgc.y - szCy - offs, sz.size.width + 2 * offs, sz.size.height - offs)
            .stroke(new pdf.PdfPen(color, 10));
        //
        doc.restoreState();
        //
        doc.x = docX;
        doc.y = docY;
    };
    return (<main className="container-fluid">
      {/* Export button */}
      <button className="btn btn-default" onClick={exportPDF}>Export</button>

      <div className="row">
        <div className="col-lg-6 col-md-12">
          {/* FlexGrid */}
          <wjcGrid.FlexGrid className="grid" autoGenerateColumns={false} headersVisibility="Column" allowMerging="All" itemsSource={employee.expenses.items} initialized={initializeGrid}>
            <wjcGrid.FlexGridColumn header="Date" binding="date" format="d" minWidth={80}/>
            <wjcGrid.FlexGridColumn header="Hotel" binding="hotel" format="c"/>
            <wjcGrid.FlexGridColumn header="Transport" binding="transport" format="c" minWidth={80}/>
            <wjcGrid.FlexGridColumn header="Meal" binding="meal" format="c"/>
            <wjcGrid.FlexGridColumn header="Fuel" binding="fuel" format="c"/>
            <wjcGrid.FlexGridColumn header="Misc" binding="misc" format="c"/>
          </wjcGrid.FlexGrid>
        </div>

        <div className="col-lg-6 col-md-12">
          <wjChartModule.FlexPie binding="value" bindingName="name" innerRadius={0.75} initialized={initializePie} itemsSource={totals}>
            <wjChartModule.FlexChartDataLabel content='{value:c1}'/>
          </wjChartModule.FlexPie>
        </div>
      </div>
    </main>);
}
const container = document.getElementById('app');
if (container) {
    const root = ReactDOM.createRoot(container);
    root.render(<App />);
}