54 lines
1.4 KiB
JavaScript
54 lines
1.4 KiB
JavaScript
/**
|
|
* imported from react-native
|
|
*/
|
|
|
|
/**
|
|
* 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;
|
|
*/
|
|
|
|
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;
|