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// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
import React from 'react';
export default class AutosizeTextarea extends React.Component {
static propTypes = {
value: React.PropTypes.string,
placeholder: React.PropTypes.string,
onHeightChange: React.PropTypes.func
}
constructor(props) {
super(props);
this.height = 0;
}
get value() {
return this.refs.textarea.value;
}
set value(value) {
this.refs.textarea.value = value;
}
componentDidUpdate() {
this.recalculateSize();
}
recalculateSize() {
const height = this.refs.reference.scrollHeight;
if (height > 0 && height !== this.height) {
const textarea = this.refs.textarea;
const style = getComputedStyle(textarea);
const borderWidth = parseInt(style.borderTopWidth, 10) + parseInt(style.borderBottomWidth, 10);
// Directly change the height to avoid circular rerenders
textarea.style.height = String(height + borderWidth) + 'px';
this.height = height;
if (this.props.onHeightChange) {
this.props.onHeightChange(height, parseInt(style.maxHeight, 10));
}
}
}
getDOMNode() {
return this.refs.textarea;
}
render() {
const props = {...this.props};
Reflect.deleteProperty(props, 'onHeightChange');
Reflect.deleteProperty(props, 'providers');
Reflect.deleteProperty(props, 'channelId');
const {
value,
placeholder,
...otherProps
} = props;
const heightProps = {};
if (this.height <= 0) {
// Set an initial number of rows so that the textarea doesn't appear too large when its first rendered
heightProps.rows = 1;
} else {
heightProps.height = this.height;
}
return (
<div>
<textarea
ref='textarea'
{...heightProps}
{...props}
/>
<div style={{height: 0, overflow: 'hidden'}}>
<textarea
ref='reference'
style={{height: 'auto', width: '100%'}}
value={value || placeholder}
rows='1'
{...otherProps}
/>
</div>
</div>
);
}
}
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