Drawing Cells Manually (React)

This sample shows how to draw cells manually using the formatItem callback function. Besides the simple cell customization, such as changing backround color, font, cell value etc. the formatItem function allows user to draw cells manually.

Learn about FlexGrid | FlexGrid API Reference

This example uses React.

import 'bootstrap.css'; import '@mescius/wijmo.styles/wijmo.css'; import ReactDOM from 'react-dom/client'; import React, { useRef } from 'react'; import useEvent from 'react-use-event-hook'; import * as wjcGrid from '@mescius/wijmo.react.grid'; import * as gridPdf from '@mescius/wijmo.grid.pdf'; import * as grid from '@mescius/wijmo.grid'; import './app.css'; import { data } from './data'; function App() { const flexGridRef = useRef(null); const initializeGrid = useEvent((ctl) => { flexGridRef.current = ctl; }); const formatItem = useEvent((sender, e) => { if (e.panel === sender.cells && sender.columns[e.col].binding === 'country') { let data = (e.panel.rows[e.row]).dataItem; // e.cell.textContent = ''; // // add flag image let image = document.createElement('img'); image.src = `resources/${data['country']}.png`; image.setAttribute('aria-label', `${data['country']}`); e.cell.appendChild(image); // // add non-breaking space e.cell.appendChild(document.createTextNode('\u00A0')); // // add text e.cell.appendChild(document.createTextNode(`${data['country']}`)); } }); const exportPDF = () => { gridPdf.FlexGridPdfConverter.export(flexGridRef.current, 'FlexGrid.pdf', { maxPages: 10, documentOptions: { header: { declarative: { text: '\t&[Page]\\&[Pages]' } }, footer: { declarative: { text: '\t&[Page]\\&[Pages]' } } }, customCellContent: true, formatItem: (args) => { if (args.panel.cellType === grid.CellType.Cell) { if (args.panel.columns[args.col].binding === 'country') { let r = args.contentRect, sz = args.canvas.measureText(args.data, args.style.font, { height: r.height, width: r.width }), image = args.canvas.openImage(`resources/${args.data}.png`), imageTop = r.top + (r.height - image.height) / 2, textTop = r.top + (r.height - sz.size.height) / 2; // // draw flag image args.canvas.drawImage(image, r.left, imageTop); // // draw text args.canvas.drawText(args.data, r.left + image.width + 3, textTop, { brush: args.style.color, font: args.style.font, height: r.height, width: r.width }); // // cancel standard cell content drawing args.cancel = true; } } } }); }; return (<main className="container-fluid"> {/* Export button */} <button className="btn btn-default" onClick={exportPDF}>Export</button> {/* FlexGrid */} <wjcGrid.FlexGrid className="grid" autoGenerateColumns={false} headersVisibility="All" selectionMode="ListBox" itemsSource={data} formatItem={formatItem} initialized={initializeGrid}> <wjcGrid.FlexGridColumn header="ID" binding="id"/> <wjcGrid.FlexGridColumn header="Country" binding="country" isReadOnly={true}/> <wjcGrid.FlexGridColumn header="Product" binding="product"/> <wjcGrid.FlexGridColumn header="Color" binding="color"/> </wjcGrid.FlexGrid> </main>); } const container = document.getElementById('app'); if (container) { const root = ReactDOM.createRoot(container); root.render(<App />); }
<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <title>Drawing cells manually</title> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <!-- SystemJS --> <script src="https://cdnjs.cloudflare.com/ajax/libs/systemjs/0.19.40/system.src.js" integrity="sha512-G6mEj6h18+m3MvzdviSDfPle/TfH0//cXcB33AKlNR/Rha0yQsKefDZKRTkIZos97HEGq2JMV1RT5ybMoQ3WsQ==" crossorigin="anonymous"></script> <script src="systemjs.config.js"></script> <script> System.import('./src/app'); </script> </head> <body> <div id="app"></div> </body> </html>
.grid { margin-top: 20px; height: 200px; }
function getData(count) { // const countries = ['US', 'Germany', 'UK', 'Japan', 'Italy', 'Greece']; const products = ['Widget', 'Gadget', 'Doohickey']; const colors = ['Orange', 'White', 'Red', 'Green', 'Blue']; // let data = []; // // add count items for (let i = 0; i < count; i++) { // constants used to create data items let countryId = Math.floor(Math.random() * countries.length), productId = Math.floor(Math.random() * products.length), colorId = Math.floor(Math.random() * colors.length); // // create the item let item = { id: i, country: countries[countryId], product: products[productId], color: colors[colorId] }; // // add the item to the list data.push(item); } // return data; } export const data = getData(5);
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'systemjs-babel-build':'npm:systemjs-plugin-babel/systemjs-babel-browser.js', "react-use-event-hook": "npm:react-use-event-hook/dist/esm/useEvent.js", }, // packages tells the System loader how to load when no filename and/or no extension packages: { src: { defaultExtension: 'jsx' }, "node_modules": { defaultExtension: 'js' }, } }); })(this);