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import React from 'react';
import autosize from 'autosize';
import { t, props } from 'tcomb-react';
const UPDATE = 'autosize:update',
DESTROY = 'autosize:destroy',
RESIZED = 'autosize:resized';
export const Props = {
onResize: t.maybe(t.Function)
};
/** A light replacement for built-in textarea component
* which automaticaly adjusts its height to match the content
* @param onResize - called whenever the textarea resizes
*/
@props(Props, { strict: false })
export default class TextareaAutosize extends React.Component {
static defaultProps = {
rows: 1
};
componentDidMount() {
autosize(this.textarea);
if (this.props.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;
render() {
const { children, onResize, ...props } = this.props; // eslint-disable-line no-unused-vars
return (
<textarea {...props} ref={(ref) => { this.textarea = ref; }}>
{children}
</textarea>
);
}
componentDidUpdate(prevProps) {
if (this.getValue(prevProps) !== this.getValue(this.props)) {
this.dispatchEvent(UPDATE);
}
}
}
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