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62 lines
1.3 KiB
TypeScript
62 lines
1.3 KiB
TypeScript
import * as React from 'react';
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import { findDOMNode } from 'react-dom';
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import ResizeObserver from 'resize-observer-polyfill';
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type DomElement = Element | null;
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interface ResizeObserverProps {
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children?: React.ReactNode;
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disabled?: boolean;
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onResize?: () => void;
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}
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class ReactResizeObserver extends React.Component<ResizeObserverProps, {}> {
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resizeObserver: ResizeObserver | null = null;
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componentDidMount() {
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this.onComponentUpdated();
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}
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componentDidUpdate() {
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this.onComponentUpdated();
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}
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componentWillUnmount() {
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this.destroyObserver();
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}
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onComponentUpdated() {
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const { disabled } = this.props;
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const element = findDOMNode(this) as DomElement;
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if (!this.resizeObserver && !disabled && element) {
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// Add resize observer
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this.resizeObserver = new ResizeObserver(this.onResize);
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this.resizeObserver.observe(element);
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} else if (disabled) {
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// Remove resize observer
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this.destroyObserver();
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}
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}
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onResize = () => {
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const { onResize } = this.props;
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if (onResize) {
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onResize();
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}
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};
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destroyObserver() {
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if (this.resizeObserver) {
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this.resizeObserver.disconnect();
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this.resizeObserver = null;
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}
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}
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render() {
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const { children = null } = this.props;
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return children;
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}
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}
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export default ReactResizeObserver;
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