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import { CSSProperties } from 'react';
import { Global } from './Global';
import { Size } from './types';
interface StringCache {
widthCache: Record<string, any>;
cacheCount: number;
}
const stringCache: StringCache = {
widthCache: {},
cacheCount: 0,
};
const MAX_CACHE_NUM = 2000;
const SPAN_STYLE = {
position: 'absolute',
top: '-20000px',
left: 0,
padding: 0,
margin: 0,
border: 'none',
whiteSpace: 'pre',
};
const MEASUREMENT_SPAN_ID = 'recharts_measurement_span';
function removeInvalidKeys(obj: Record<string, any>) {
const copyObj = { ...obj };
Object.keys(copyObj).forEach(key => {
if (!copyObj[key]) {
delete copyObj[key];
}
});
return copyObj;
}
export const getStringSize = (text: string | number, style: CSSProperties = {}): Size => {
if (text === undefined || text === null || Global.isSsr) {
return { width: 0, height: 0 };
}
const copyStyle = removeInvalidKeys(style);
const cacheKey = JSON.stringify({ text, copyStyle });
if (stringCache.widthCache[cacheKey]) {
return stringCache.widthCache[cacheKey];
}
try {
let measurementSpan = document.getElementById(MEASUREMENT_SPAN_ID);
if (!measurementSpan) {
measurementSpan = document.createElement('span');
measurementSpan.setAttribute('id', MEASUREMENT_SPAN_ID);
measurementSpan.setAttribute('aria-hidden', 'true');
document.body.appendChild(measurementSpan);
}
// Need to use CSS Object Model (CSSOM) to be able to comply with Content Security Policy (CSP)
// https://en.wikipedia.org/wiki/Content_Security_Policy
const measurementSpanStyle: Record<string, any> = { ...SPAN_STYLE, ...copyStyle };
Object.assign(measurementSpan.style, measurementSpanStyle);
measurementSpan.textContent = `${text}`;
const rect = measurementSpan.getBoundingClientRect();
const result = { width: rect.width, height: rect.height };
stringCache.widthCache[cacheKey] = result;
if (++stringCache.cacheCount > MAX_CACHE_NUM) {
stringCache.cacheCount = 0;
stringCache.widthCache = {};
}
return result;
} catch {
return { width: 0, height: 0 };
}
};
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