react-native-web-internals
Version:
React Native for Web
49 lines (48 loc) • 2.02 kB
JavaScript
import canUseDOM from "../canUseDOM.mjs";
import UIManager from "../UIManager/index.mjs";
import useLayoutEffect from "../useLayoutEffect/index.mjs";
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 };
//# sourceMappingURL=index.mjs.map