A UMD build of use-resize-observer
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.org/scripts/516163/1479101/use-resize-observer-umd.js
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('react')) :
typeof define === 'function' && define.amd ? define(['react'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.useResizeObserver = factory(global.React));
})(this, (function (react) { 'use strict';
/* esm.sh - esbuild bundle([email protected]) es2022 development */
// ../esmd/npm/[email protected]/node_modules/.pnpm/[email protected][email protected][email protected]/node_modules/use-resize-observer/dist/bundle.esm.js
function useResolvedElement(subscriber, refOrElement) {
var lastReportRef = react.useRef(null);
var refOrElementRef = react.useRef(null);
refOrElementRef.current = refOrElement;
var cbElementRef = react.useRef(null);
react.useEffect(function() {
evaluateSubscription();
});
var evaluateSubscription = react.useCallback(function() {
var cbElement = cbElementRef.current;
var refOrElement2 = refOrElementRef.current;
var element = cbElement ? cbElement : refOrElement2 ? refOrElement2 instanceof Element ? refOrElement2 : refOrElement2.current : null;
if (lastReportRef.current && lastReportRef.current.element === element && lastReportRef.current.subscriber === subscriber) {
return;
}
if (lastReportRef.current && lastReportRef.current.cleanup) {
lastReportRef.current.cleanup();
}
lastReportRef.current = {
element,
subscriber,
// Only calling the subscriber, if there's an actual element to report.
// Setting cleanup to undefined unless a subscriber returns one, as an existing cleanup function would've been just called.
cleanup: element ? subscriber(element) : void 0
};
}, [subscriber]);
react.useEffect(function() {
return function() {
if (lastReportRef.current && lastReportRef.current.cleanup) {
lastReportRef.current.cleanup();
lastReportRef.current = null;
}
};
}, []);
return react.useCallback(function(element) {
cbElementRef.current = element;
evaluateSubscription();
}, [evaluateSubscription]);
}
function extractSize(entry, boxProp, sizeType) {
if (!entry[boxProp]) {
if (boxProp === "contentBoxSize") {
return entry.contentRect[sizeType === "inlineSize" ? "width" : "height"];
}
return void 0;
}
return entry[boxProp][0] ? entry[boxProp][0][sizeType] : (
// TS complains about this, because the RO entry type follows the spec and does not reflect Firefox's current
// behaviour of returning objects instead of arrays for `borderBoxSize` and `contentBoxSize`.
// @ts-ignore
entry[boxProp][sizeType]
);
}
function useResizeObserver(opts) {
if (opts === void 0) {
opts = {};
}
var onResize = opts.onResize;
var onResizeRef = react.useRef(void 0);
onResizeRef.current = onResize;
var round = opts.round || Math.round;
var resizeObserverRef = react.useRef();
var _useState = react.useState({
width: void 0,
height: void 0
}), size = _useState[0], setSize = _useState[1];
var didUnmount = react.useRef(false);
react.useEffect(function() {
didUnmount.current = false;
return function() {
didUnmount.current = true;
};
}, []);
var previous = react.useRef({
width: void 0,
height: void 0
});
var refCallback = useResolvedElement(react.useCallback(function(element) {
if (!resizeObserverRef.current || resizeObserverRef.current.box !== opts.box || resizeObserverRef.current.round !== round) {
resizeObserverRef.current = {
box: opts.box,
round,
instance: new ResizeObserver(function(entries) {
var entry = entries[0];
var boxProp = opts.box === "border-box" ? "borderBoxSize" : opts.box === "device-pixel-content-box" ? "devicePixelContentBoxSize" : "contentBoxSize";
var reportedWidth = extractSize(entry, boxProp, "inlineSize");
var reportedHeight = extractSize(entry, boxProp, "blockSize");
var newWidth = reportedWidth ? round(reportedWidth) : void 0;
var newHeight = reportedHeight ? round(reportedHeight) : void 0;
if (previous.current.width !== newWidth || previous.current.height !== newHeight) {
var newSize = {
width: newWidth,
height: newHeight
};
previous.current.width = newWidth;
previous.current.height = newHeight;
if (onResizeRef.current) {
onResizeRef.current(newSize);
} else {
if (!didUnmount.current) {
setSize(newSize);
}
}
}
})
};
}
resizeObserverRef.current.instance.observe(element, {
box: opts.box
});
return function() {
if (resizeObserverRef.current) {
resizeObserverRef.current.instance.unobserve(element);
}
};
}, [opts.box, round]), opts.ref);
return react.useMemo(function() {
return {
ref: refCallback,
width: size.width,
height: size.height
};
}, [refCallback, size.width, size.height]);
}
return useResizeObserver;
}));