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perf[ScrollPane]: refine moveToTarget code (#1460)

This commit is contained in:
董雨 2018-12-26 14:02:43 +08:00 committed by Pan
parent 3a2da6afd3
commit cff015f5d6
1 changed files with 4 additions and 17 deletions
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21
src/components/ScrollPane/index.vue
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@ -28,8 +28,6 @@ export default {
let firstTag = null let firstTag = null
let lastTag = null let lastTag = null
let prevTag = null
let nextTag = null
// find first tag and last tag // find first tag and last tag
if (tagList.length > 0) { if (tagList.length > 0) {
@ -37,26 +35,15 @@ export default {
lastTag = tagList[tagList.length - 1] lastTag = tagList[tagList.length - 1]
} }
// find preTag and nextTag
for (let i = 0; i < tagList.length; i++) {
if (tagList[i] === currentTag) {
if (i === 0) {
nextTag = tagList[i].length > 1 && tagList[i + 1]
} else if (i === tagList.length - 1) {
prevTag = tagList[i].length > 1 && tagList[i - 1]
} else {
prevTag = tagList[i - 1]
nextTag = tagList[i + 1]
}
break
}
}
if (firstTag === currentTag) { if (firstTag === currentTag) {
$scrollWrapper.scrollLeft = 0 $scrollWrapper.scrollLeft = 0
} else if (lastTag === currentTag) { } else if (lastTag === currentTag) {
$scrollWrapper.scrollLeft = $scrollWrapper.scrollWidth - $containerWidth $scrollWrapper.scrollLeft = $scrollWrapper.scrollWidth - $containerWidth
} else { } else {
// find preTag and nextTag
const currentIndex = tagList.findIndex(item => item === currentTag)
const prevTag = tagList[currentIndex - 1]
const nextTag = tagList[currentIndex + 1]
// the tag's offsetLeft after of nextTag // the tag's offsetLeft after of nextTag
const afterNextTagOffsetLeft = nextTag.$el.offsetLeft + nextTag.$el.offsetWidth + tagAndTagSpacing const afterNextTagOffsetLeft = nextTag.$el.offsetLeft + nextTag.$el.offsetWidth + tagAndTagSpacing