musicq / vist Goto Github PK
View Code? Open in Web Editor NEWVirtual-list component build with react and rxjs
Home Page: https://musicq.github.io/vist
License: MIT License
Virtual-list component build with react and rxjs
Home Page: https://musicq.github.io/vist
License: MIT License
@musicq 你好,在看你的源码发现在复用DOM的算法处有一个小 trick。但是不明所以,故向你请教:
Q1: 为什么这里要 +1
呢?
我试着改了一下此处,发现如果不 +1
在往回滚 1 个 option.height
的时候 getDifferenceIndexes
函数工作不正确,返回的数组为 []
。
return (this.stateDataSnapshot = data.slice(firstIndex, lastIndex + 1).map(item => ({
let newIndex = dir > 0 ? lastIndex - diffSliceIndexes.length + 1 /* down */: firstIndex /* up */;
Q2: 为什么 +1 就可以正常工作了呢?
如果你能在百忙中回复,这也许能够帮助晚辈很快理解这个 trick 用法的原因。
代码经过这样的修改后工作正常,不用 +1 也正确 diff index。
const newIndexes = new Array(endIndex - startIndex)
.fill(startIndex)
.map((i, d) => i + d);
const diffIndexes = pool.reduce((acc, cur, idx) => {
if (!newIndexes.includes(cur.$pos)) {
acc[acc.length] = idx;
}
return acc;
}, []);
另,觉得这个 重用DOM getDifferenceIndexes
的算法非常的实惠,非常感谢。
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