react-native-reanimated/lib/module/createAnimatedComponent/setAndForwardRef.js

More powerful alternative to Animated library for React Native.

'use strict';

/**
 * imported from react-native
 */
/* eslint-disable */
/**
 * This is a helper function for when a component needs to be able to forward a ref
 * to a child component, but still needs to have access to that component as part of
 * its implementation.
 *
 * Its main use case is in wrappers for native components.
 *
 * Usage:
 *
 *   class MyView extends React.Component {
 *     _nativeRef = null;
 *
 *     _setNativeRef = setAndForwardRef({
 *       getForwardedRef: () => this.props.forwardedRef,
 *       setLocalRef: ref => {
 *         this._nativeRef = ref;
 *       },
 *     });
 *
 *     render() {
 *       return <View ref={this._setNativeRef} />;
 *     }
 *   }
 *
 *   const MyViewWithRef = React.forwardRef((props, ref) => (
 *     <MyView {...props} forwardedRef={ref} />
 *   ));
 *
 *   module.exports = MyViewWithRef;
 */
/* eslint-enable */
function setAndForwardRef({
  getForwardedRef,
  setLocalRef
}) {
  return function forwardRef(ref) {
    const forwardedRef = getForwardedRef();
    setLocalRef(ref);

    // Forward to user ref prop (if one has been specified)
    if (typeof forwardedRef === 'function') {
      // Handle function-based refs. String-based refs are handled as functions.
      forwardedRef(ref);
    } else if (typeof forwardedRef === 'object' && forwardedRef != null) {
      // Handle createRef-based refs
      forwardedRef.current = ref;
    }
  };
}
export default setAndForwardRef;
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