bc518174
 王天杨
提交两个项目文件
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
// packages/core/rect/src/observeElementRect.ts
function observeElementRect(elementToObserve, callback) {
const observedData = observedElements.get(elementToObserve);
if (observedData === void 0) {
observedElements.set(elementToObserve, { rect: {}, callbacks: [callback] });
if (observedElements.size === 1) {
rafId = requestAnimationFrame(runLoop);
}
} else {
observedData.callbacks.push(callback);
callback(elementToObserve.getBoundingClientRect());
}
return () => {
const observedData2 = observedElements.get(elementToObserve);
if (observedData2 === void 0) return;
const index = observedData2.callbacks.indexOf(callback);
if (index > -1) {
observedData2.callbacks.splice(index, 1);
}
if (observedData2.callbacks.length === 0) {
observedElements.delete(elementToObserve);
if (observedElements.size === 0) {
cancelAnimationFrame(rafId);
}
}
};
}
var rafId;
var observedElements = /* @__PURE__ */ new Map();
function runLoop() {
const changedRectsData = [];
observedElements.forEach((data, element) => {
const newRect = element.getBoundingClientRect();
if (!rectEquals(data.rect, newRect)) {
data.rect = newRect;
changedRectsData.push(data);
}
});
changedRectsData.forEach((data) => {
data.callbacks.forEach((callback) => callback(data.rect));
});
rafId = requestAnimationFrame(runLoop);
}
function rectEquals(rect1, rect2) {
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;
}
export {
observeElementRect
};
//# sourceMappingURL=index.mjs.map
|
