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<template>
<el-scrollbar ref="scrollContainer" :vertical="false" class="scroll-container" @wheel.native.prevent="handleScroll">
<slot/>
</el-scrollbar>
</template>
<script>
const tagAndTagSpacing = 4 // tagAndTagSpacing
export default {
name: 'ScrollPane',
data() {
return {
left: 0
}
},
methods: {
handleScroll(e) {
const eventDelta = e.wheelDelta || -e.deltaY * 40
const $scrollWrapper = this.$refs.scrollContainer.$refs.wrap
$scrollWrapper.scrollLeft = $scrollWrapper.scrollLeft + eventDelta / 4
},
moveToTarget(currentTag) {
const $container = this.$refs.scrollContainer.$el
const $containerWidth = $container.offsetWidth
const $scrollWrapper = this.$refs.scrollContainer.$refs.wrap
const tagList = this.$parent.$refs.tag
let firstTag = null
let lastTag = null
let prevTag = null
let nextTag = null
// find first tag and last tag
if (tagList.length > 0) {
firstTag = tagList[0]
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) {
$scrollWrapper.scrollLeft = 0
} else if (lastTag === currentTag) {
$scrollWrapper.scrollLeft = $scrollWrapper.scrollWidth - $containerWidth
} else {
// the tag's offsetLeft after of nextTag
const afterNextTagOffsetLeft = nextTag.$el.offsetLeft + nextTag.$el.offsetWidth + tagAndTagSpacing
// the tag's offsetLeft before of prevTag
const beforePrevTagOffsetLeft = prevTag.$el.offsetLeft - tagAndTagSpacing
if (afterNextTagOffsetLeft > $scrollWrapper.scrollLeft + $containerWidth) {
$scrollWrapper.scrollLeft = afterNextTagOffsetLeft - $containerWidth
} else if (beforePrevTagOffsetLeft < $scrollWrapper.scrollLeft) {
$scrollWrapper.scrollLeft = beforePrevTagOffsetLeft
}
}
}
}
}
</script>
<style rel="stylesheet/scss" lang="scss" scoped>
.scroll-container {
white-space: nowrap;
position: relative;
overflow: hidden;
width: 100%;
/deep/ {
.el-scrollbar__bar {
bottom: 0px;
}
.el-scrollbar__wrap {
height: 49px;
}
}
}
</style>