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TextareaAutosize.js
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Fri, Jan 24, 18:29

TextareaAutosize.js
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import _extends from "@babel/runtime/helpers/esm/extends";
import _objectWithoutPropertiesLoose from "@babel/runtime/helpers/esm/objectWithoutPropertiesLoose";
const _excluded = ["onChange", "maxRows", "minRows", "style", "value"];
import * as React from 'react';
import PropTypes from 'prop-types';
import { flushSync } from 'react-dom';
import { unstable_debounce as debounce, unstable_useForkRef as useForkRef, unstable_useEnhancedEffect as useEnhancedEffect, unstable_ownerWindow as ownerWindow } from '@mui/utils';
import { jsx as _jsx } from "react/jsx-runtime";
import { jsxs as _jsxs } from "react/jsx-runtime";
function getStyleValue(computedStyle, property) {
return parseInt(computedStyle[property], 10) || 0;
}
const styles = {
shadow: {
// Visibility needed to hide the extra text area on iPads
visibility: 'hidden',
// Remove from the content flow
position: 'absolute',
// Ignore the scrollbar width
overflow: 'hidden',
height: 0,
top: 0,
left: 0,
// Create a new layer, increase the isolation of the computed values
transform: 'translateZ(0)'
}
};
function isEmpty(obj) {
return obj === undefined || obj === null || Object.keys(obj).length === 0;
}
const TextareaAutosize = /*#__PURE__*/React.forwardRef(function TextareaAutosize(props, ref) {
const {
onChange,
maxRows,
minRows = 1,
style,
value
} = props,
other = _objectWithoutPropertiesLoose(props, _excluded);
const {
current: isControlled
} = React.useRef(value != null);
const inputRef = React.useRef(null);
const handleRef = useForkRef(ref, inputRef);
const shadowRef = React.useRef(null);
const renders = React.useRef(0);
const [state, setState] = React.useState({});
const getUpdatedState = React.useCallback(() => {
const input = inputRef.current;
const containerWindow = ownerWindow(input);
const computedStyle = containerWindow.getComputedStyle(input);
// If input's width is shrunk and it's not visible, don't sync height.
if (computedStyle.width === '0px') {
return {};
}
const inputShallow = shadowRef.current;
inputShallow.style.width = computedStyle.width;
inputShallow.value = input.value || props.placeholder || 'x';
if (inputShallow.value.slice(-1) === '\n') {
// Certain fonts which overflow the line height will cause the textarea
// to report a different scrollHeight depending on whether the last line
// is empty. Make it non-empty to avoid this issue.
inputShallow.value += ' ';
}
const boxSizing = computedStyle['box-sizing'];
const padding = getStyleValue(computedStyle, 'padding-bottom') + getStyleValue(computedStyle, 'padding-top');
const border = getStyleValue(computedStyle, 'border-bottom-width') + getStyleValue(computedStyle, 'border-top-width');
// The height of the inner content
const innerHeight = inputShallow.scrollHeight;
// Measure height of a textarea with a single row
inputShallow.value = 'x';
const singleRowHeight = inputShallow.scrollHeight;
// The height of the outer content
let outerHeight = innerHeight;
if (minRows) {
outerHeight = Math.max(Number(minRows) * singleRowHeight, outerHeight);
}
if (maxRows) {
outerHeight = Math.min(Number(maxRows) * singleRowHeight, outerHeight);
}
outerHeight = Math.max(outerHeight, singleRowHeight);
// Take the box sizing into account for applying this value as a style.
const outerHeightStyle = outerHeight + (boxSizing === 'border-box' ? padding + border : 0);
const overflow = Math.abs(outerHeight - innerHeight) <= 1;
return {
outerHeightStyle,
overflow
};
}, [maxRows, minRows, props.placeholder]);
const updateState = (prevState, newState) => {
const {
outerHeightStyle,
overflow
} = newState;
// Need a large enough difference to update the height.
// This prevents infinite rendering loop.
if (renders.current < 20 && (outerHeightStyle > 0 && Math.abs((prevState.outerHeightStyle || 0) - outerHeightStyle) > 1 || prevState.overflow !== overflow)) {
renders.current += 1;
return {
overflow,
outerHeightStyle
};
}
if (process.env.NODE_ENV !== 'production') {
if (renders.current === 20) {
console.error(['MUI: Too many re-renders. The layout is unstable.', 'TextareaAutosize limits the number of renders to prevent an infinite loop.'].join('\n'));
}
}
return prevState;
};
const syncHeight = React.useCallback(() => {
const newState = getUpdatedState();
if (isEmpty(newState)) {
return;
}
setState(prevState => {
return updateState(prevState, newState);
});
}, [getUpdatedState]);
const syncHeightWithFlushSycn = () => {
const newState = getUpdatedState();
if (isEmpty(newState)) {
return;
}
// In React 18, state updates in a ResizeObserver's callback are happening after the paint which causes flickering
// when doing some visual updates in it. Using flushSync ensures that the dom will be painted after the states updates happen
// Related issue - https://github.com/facebook/react/issues/24331
flushSync(() => {
setState(prevState => {
return updateState(prevState, newState);
});
});
};
React.useEffect(() => {
const handleResize = debounce(() => {
renders.current = 0;
// If the TextareaAutosize component is replaced by Suspense with a fallback, the last
// ResizeObserver's handler that runs because of the change in the layout is trying to
// access a dom node that is no longer there (as the fallback component is being shown instead).
// See https://github.com/mui/material-ui/issues/32640
if (inputRef.current) {
syncHeightWithFlushSycn();
}
});
const containerWindow = ownerWindow(inputRef.current);
containerWindow.addEventListener('resize', handleResize);
let resizeObserver;
if (typeof ResizeObserver !== 'undefined') {
resizeObserver = new ResizeObserver(handleResize);
resizeObserver.observe(inputRef.current);
}
return () => {
handleResize.clear();
containerWindow.removeEventListener('resize', handleResize);
if (resizeObserver) {
resizeObserver.disconnect();
}
};
});
useEnhancedEffect(() => {
syncHeight();
});
React.useEffect(() => {
renders.current = 0;
}, [value]);
const handleChange = event => {
renders.current = 0;
if (!isControlled) {
syncHeight();
}
if (onChange) {
onChange(event);
}
};
return /*#__PURE__*/_jsxs(React.Fragment, {
children: [/*#__PURE__*/_jsx("textarea", _extends({
value: value,
onChange: handleChange,
ref: handleRef
// Apply the rows prop to get a "correct" first SSR paint
,
rows: minRows,
style: _extends({
height: state.outerHeightStyle,
// Need a large enough difference to allow scrolling.
// This prevents infinite rendering loop.
overflow: state.overflow ? 'hidden' : null
}, style)
}, other)), /*#__PURE__*/_jsx("textarea", {
"aria-hidden": true,
className: props.className,
readOnly: true,
ref: shadowRef,
tabIndex: -1,
style: _extends({}, styles.shadow, style, {
padding: 0
})
})]
});
});
process.env.NODE_ENV !== "production" ? TextareaAutosize.propTypes /* remove-proptypes */ = {
// ----------------------------- Warning --------------------------------
// | These PropTypes are generated from the TypeScript type definitions |
// | To update them edit the d.ts file and run "yarn proptypes" |
// ----------------------------------------------------------------------
/**
* @ignore
*/
className: PropTypes.string,
/**
* Maximum number of rows to display.
*/
maxRows: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),
/**
* Minimum number of rows to display.
* @default 1
*/
minRows: PropTypes.oneOfType([PropTypes.number, PropTypes.string]),
/**
* @ignore
*/
onChange: PropTypes.func,
/**
* @ignore
*/
placeholder: PropTypes.string,
/**
* @ignore
*/
style: PropTypes.object,
/**
* @ignore
*/
value: PropTypes.oneOfType([PropTypes.arrayOf(PropTypes.string), PropTypes.number, PropTypes.string])
} : void 0;
export default TextareaAutosize;

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