react-native-web-internals/dist/esm/modules/useElementLayout/index.js

React Native for Web

import canUseDOM from "../canUseDOM";
import UIManager from "../UIManager/index";
import useLayoutEffect from "../useLayoutEffect/index";
const DOM_LAYOUT_HANDLER_NAME = "__reactLayoutHandler";
let didWarn = !canUseDOM, resizeObserver = null;
function getResizeObserver() {
  return canUseDOM && typeof window.ResizeObserver < "u" ? resizeObserver == null && (resizeObserver = new window.ResizeObserver(function(entries) {
    entries.forEach((entry) => {
      const node = entry.target, onLayout = node[DOM_LAYOUT_HANDLER_NAME];
      typeof onLayout == "function" && UIManager.measure(node, (x, y, width, height, left, top) => {
        const event = {
          // @ts-ignore
          nativeEvent: {
            layout: { x, y, width, height, left, top }
          },
          timeStamp: Date.now()
        };
        Object.defineProperty(event.nativeEvent, "target", {
          enumerable: !0,
          get: () => entry.target
        }), onLayout(event);
      });
    });
  })) : didWarn || process.env.NODE_ENV !== "production" && process.env.NODE_ENV !== "test" && (console.warn(
    "onLayout relies on ResizeObserver which is not supported by your browser. Please include a polyfill, e.g., https://github.com/que-etc/resize-observer-polyfill."
  ), didWarn = !0), resizeObserver;
}
function useElementLayout(ref, onLayout) {
  const observer = getResizeObserver();
  useLayoutEffect(() => {
    const node = ref.current;
    node != null && (node[DOM_LAYOUT_HANDLER_NAME] = onLayout);
  }, [ref, onLayout]), useLayoutEffect(() => {
    const node = ref.current;
    return node != null && observer != null && (typeof node[DOM_LAYOUT_HANDLER_NAME] == "function" ? observer.observe(node) : observer.unobserve(node)), () => {
      node != null && observer != null && observer.unobserve(node);
    };
  }, [ref, observer]);
}
export {
  useElementLayout as default
};
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