<template>
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<el-scrollbar
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ref="scrollContainer"
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:vertical="false"
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class="scroll-container"
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@wheel.native.prevent="handleScroll"
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>
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<slot />
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</el-scrollbar>
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</template>
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<script>
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const tagAndTagSpacing = 4 // tagAndTagSpacing
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export default {
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name: 'ScrollPane',
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data() {
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return {
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left: 0,
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}
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},
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computed: {
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scrollWrapper() {
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return this.$refs.scrollContainer.$refs.wrap
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},
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},
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mounted() {
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this.scrollWrapper.addEventListener('scroll', this.emitScroll, true)
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},
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beforeDestroy() {
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this.scrollWrapper.removeEventListener('scroll', this.emitScroll)
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},
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methods: {
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handleScroll(e) {
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const eventDelta = e.wheelDelta || -e.deltaY * 40
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const $scrollWrapper = this.scrollWrapper
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$scrollWrapper.scrollLeft = $scrollWrapper.scrollLeft + eventDelta / 4
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},
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emitScroll() {
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this.$emit('scroll')
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},
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moveToTarget(currentTag, visitedViews) {
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const $container = this.$refs.scrollContainer.$el
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const $containerWidth = $container.offsetWidth
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const $scrollWrapper = this.scrollWrapper
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// 这边的tagList的顺序不能保证和实际源数组的顺序保持一致
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// 比如源数组中在某个位置删除一项，然后在相同位置加入一项，那么加入的这一项是在tagList末尾
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// 所以这边不能直接根据顺序去取第一项和最后一项
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const tagList = this.$parent.$refs.tag
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let firstTag = null
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let lastTag = null
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// find first tag and last tag
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if (tagList.length > 0) {
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firstTag = tagList.find(
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(item) => item?.to?.name === visitedViews[0].name
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)
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lastTag = tagList.find(
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(item) =>
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item?.to?.name === visitedViews[visitedViews.length - 1].name
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)
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}
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if (firstTag === currentTag) {
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$scrollWrapper.scrollLeft = 0
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} else if (lastTag === currentTag) {
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$scrollWrapper.scrollLeft = $scrollWrapper.scrollWidth - $containerWidth
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} else {
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// find preTag and nextTag
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const currentIndex = visitedViews.findIndex(
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(item) => item.name === currentTag?.to?.name
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)
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const prevTag = tagList.find(
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(item) => item?.to?.name === visitedViews[currentIndex - 1].name
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)
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const nextTag = tagList.find(
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(item) => item?.to?.name === visitedViews[currentIndex + 1].name
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)
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// the tag's offsetLeft after of nextTag
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const afterNextTagOffsetLeft =
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nextTag.$el.offsetLeft + nextTag.$el.offsetWidth + tagAndTagSpacing
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// the tag's offsetLeft before of prevTag
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const beforePrevTagOffsetLeft =
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prevTag.$el.offsetLeft - tagAndTagSpacing
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if (
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afterNextTagOffsetLeft >
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$scrollWrapper.scrollLeft + $containerWidth
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) {
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$scrollWrapper.scrollLeft = afterNextTagOffsetLeft - $containerWidth
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} else if (beforePrevTagOffsetLeft < $scrollWrapper.scrollLeft) {
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$scrollWrapper.scrollLeft = beforePrevTagOffsetLeft
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}
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}
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},
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},
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}
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</script>
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<style lang="scss" scoped>
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.scroll-container {
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white-space: nowrap;
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position: relative;
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overflow: hidden;
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width: 100%;
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::v-deep {
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.el-scrollbar__bar {
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bottom: 0px;
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}
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.el-scrollbar__wrap {
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height: 49px;
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overflow-x: auto !important;
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}
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}
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}
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</style>
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