@mui/core/legacy/TextareaAutosize/TextareaAutosize.js

Unstyled React components with which to implement custom design systems.

import _extends from "@babel/runtime/helpers/esm/extends";
import _objectWithoutProperties from "@babel/runtime/helpers/esm/objectWithoutProperties";
import * as React from 'react';
import PropTypes from 'prop-types';
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;
}

var 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)'
  }
};
var TextareaAutosize = /*#__PURE__*/React.forwardRef(function TextareaAutosize(props, ref) {
  var onChange = props.onChange,
      maxRows = props.maxRows,
      _props$minRows = props.minRows,
      minRows = _props$minRows === void 0 ? 1 : _props$minRows,
      style = props.style,
      value = props.value,
      other = _objectWithoutProperties(props, ["onChange", "maxRows", "minRows", "style", "value"]);

  var _React$useRef = React.useRef(value != null),
      isControlled = _React$useRef.current;

  var inputRef = React.useRef(null);
  var handleRef = useForkRef(ref, inputRef);
  var shadowRef = React.useRef(null);
  var renders = React.useRef(0);

  var _React$useState = React.useState({}),
      state = _React$useState[0],
      setState = _React$useState[1];

  var syncHeight = React.useCallback(function () {
    var input = inputRef.current;
    var containerWindow = ownerWindow(input);
    var computedStyle = containerWindow.getComputedStyle(input); // If input's width is shrunk and it's not visible, don't sync height.

    if (computedStyle.width === '0px') {
      return;
    }

    var 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 += ' ';
    }

    var boxSizing = computedStyle['box-sizing'];
    var padding = getStyleValue(computedStyle, 'padding-bottom') + getStyleValue(computedStyle, 'padding-top');
    var border = getStyleValue(computedStyle, 'border-bottom-width') + getStyleValue(computedStyle, 'border-top-width'); // The height of the inner content

    var innerHeight = inputShallow.scrollHeight; // Measure height of a textarea with a single row

    inputShallow.value = 'x';
    var singleRowHeight = inputShallow.scrollHeight; // The height of the outer content

    var 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.

    var outerHeightStyle = outerHeight + (boxSizing === 'border-box' ? padding + border : 0);
    var overflow = Math.abs(outerHeight - innerHeight) <= 1;
    setState(function (prevState) {
      // 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: overflow,
          outerHeightStyle: 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;
    });
  }, [maxRows, minRows, props.placeholder]);
  React.useEffect(function () {
    var handleResize = debounce(function () {
      renders.current = 0;
      syncHeight();
    });
    var containerWindow = ownerWindow(inputRef.current);
    containerWindow.addEventListener('resize', handleResize);
    var resizeObserver;

    if (typeof ResizeObserver !== 'undefined') {
      resizeObserver = new ResizeObserver(handleResize);
      resizeObserver.observe(inputRef.current);
    }

    return function () {
      handleResize.clear();
      containerWindow.removeEventListener('resize', handleResize);

      if (resizeObserver) {
        resizeObserver.disconnect();
      }
    };
  }, [syncHeight]);
  useEnhancedEffect(function () {
    syncHeight();
  });
  React.useEffect(function () {
    renders.current = 0;
  }, [value]);

  var handleChange = function 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;