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import React from 'react';
import PropTypes from 'prop-types';
import autosize from 'autosize';
import getLineHeight from 'line-height';
const UPDATE = 'autosize:update',
DESTROY = 'autosize:destroy',
RESIZED = 'autosize:resized';
/** A light replacement for built-in textarea component
* which automaticaly adjusts its height to match the content
* @param onResize - called whenever the textarea resizes
* @param rows - minimum number of visible rows
* @param maxRows - maximum number of visible rows
* @param innerRef - called with the ref to the DOM node
*/
export default class TextareaAutosize extends React.Component {
static defaultProps = {
rows: 1
};
state = {
maxHeight: null
}
componentDidMount() {
const { onResize, maxRows } = this.props;
if (typeof maxRows === 'number') {
this.updateMaxHeight();
// this trick is needed to force "autosize" to activate the scrollbar
setTimeout(() => autosize(this.textarea));
} else {
autosize(this.textarea);
}
if (onResize) {
this.textarea.addEventListener(RESIZED, this.props.onResize);
}
}
componentWillUnmount() {
if (this.props.onResize) {
this.textarea.removeEventListener(RESIZED, this.props.onResize);
}
this.dispatchEvent(DESTROY);
}
dispatchEvent = (EVENT_TYPE) => {
const event = document.createEvent('Event');
event.initEvent(EVENT_TYPE, true, false);
this.textarea.dispatchEvent(event);
};
getValue = ({ valueLink, value }) => valueLink ? valueLink.value : value;
hasReachedMaxRows = (value) => {
const { maxRows } = this.props;
const numberOfRows = (value || '').split('\n').length;
return numberOfRows >= parseInt(maxRows);
}
updateMaxHeight = () => {
const { maxRows } = this.props;
this.setState({
maxHeight: getLineHeight(this.textarea) * maxRows
});
return true;
}
onChange = e => {
this.updateMaxHeight(e.target.value);
this.props.onChange && this.props.onChange(e);
}
saveDOMNodeRef = ref => {
const { innerRef } = this.props;
if (innerRef) {
innerRef(ref);
}
this.textarea = ref;
}
getLocals = () => {
const {
props: { onResize, maxRows, onChange, style, innerRef, ...props }, // eslint-disable-line no-unused-vars
state: { maxHeight },
saveDOMNodeRef
} = this;
return {
...props,
saveDOMNodeRef,
style: maxHeight ? { ...style, maxHeight, padding: 0 } : style,
onChange: this.onChange
};
}
render() {
const { children, saveDOMNodeRef, ...locals } = this.getLocals();
return (
<textarea {...locals} ref={saveDOMNodeRef}>
{children}
</textarea>
);
}
componentDidUpdate(prevProps) {
if (this.getValue(prevProps) !== this.getValue(this.props)) {
this.dispatchEvent(UPDATE);
}
}
}
TextareaAutosize.propTypes = {
rows: PropTypes.number,
maxRows: PropTypes.number,
onResize: PropTypes.func,
innerRef: PropTypes.func
};
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