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import React from 'react';
import autosize from 'autosize';
const UPDATE = 'autosize:update',
DESTROY = 'autosize:destroy',
RESIZED = 'autosize:resized';
const TextareaAutosize = React.createClass({
propTypes: {
onResize: React.PropTypes.func
},
getDefaultProps() {
return {
rows: 1
};
},
componentDidMount() {
autosize(this.refs.textarea);
if (this.props.onResize) {
this.refs.textarea.addEventListener(RESIZED, this.props.onResize);
}
},
componentWillUnmount() {
if (this.props.onResize) {
this.refs.textarea.removeEventListener(RESIZED, this.props.onResize);
}
this.dispatchEvent(DESTROY);
},
dispatchEvent(EVENT_TYPE, defer) {
const event = document.createEvent('Event');
event.initEvent(EVENT_TYPE, true, false);
const dispatch = () => this.refs.textarea.dispatchEvent(event);
if (defer) {
setTimeout(dispatch);
} else {
dispatch();
}
},
getValue(props) {
if (props) {
return props.valueLink ? props.valueLink.value : props.value;
}
},
render() {
return (
<textarea {...this.props} ref='textarea'>
{this.props.children}
</textarea>
);
},
componentWillReceiveProps(nextProps) {
if (this.getValue(nextProps) !== this.getValue(this.props)) {
this.dispatchEvent(UPDATE, true);
}
},
});
export default TextareaAutosize;
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