51 lines
1.7 KiB
JavaScript
51 lines
1.7 KiB
JavaScript
// packages/core/rect/src/observeElementRect.ts
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function observeElementRect(elementToObserve, callback) {
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const observedData = observedElements.get(elementToObserve);
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if (observedData === void 0) {
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observedElements.set(elementToObserve, { rect: {}, callbacks: [callback] });
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if (observedElements.size === 1) {
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rafId = requestAnimationFrame(runLoop);
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}
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} else {
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observedData.callbacks.push(callback);
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callback(elementToObserve.getBoundingClientRect());
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}
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return () => {
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const observedData2 = observedElements.get(elementToObserve);
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if (observedData2 === void 0) return;
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const index = observedData2.callbacks.indexOf(callback);
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if (index > -1) {
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observedData2.callbacks.splice(index, 1);
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}
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if (observedData2.callbacks.length === 0) {
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observedElements.delete(elementToObserve);
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if (observedElements.size === 0) {
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cancelAnimationFrame(rafId);
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}
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}
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};
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}
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var rafId;
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var observedElements = /* @__PURE__ */ new Map();
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function runLoop() {
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const changedRectsData = [];
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observedElements.forEach((data, element) => {
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const newRect = element.getBoundingClientRect();
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if (!rectEquals(data.rect, newRect)) {
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data.rect = newRect;
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changedRectsData.push(data);
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}
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});
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changedRectsData.forEach((data) => {
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data.callbacks.forEach((callback) => callback(data.rect));
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});
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rafId = requestAnimationFrame(runLoop);
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}
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function rectEquals(rect1, rect2) {
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return rect1.width === rect2.width && rect1.height === rect2.height && rect1.top === rect2.top && rect1.right === rect2.right && rect1.bottom === rect2.bottom && rect1.left === rect2.left;
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}
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export {
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observeElementRect
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};
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//# sourceMappingURL=index.mjs.map
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