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<el-scrollbar ref=\"scrollContainer\" :vertical=\"false\" class=\"scroll-container\" @wheel.native.prevent=\"handleScroll\">\n <slot />\n </el-scrollbar>\n</template>\n\n<script>\nconst tagAndTagSpacing = 4 // tagAndTagSpacing\n\nexport default {\n name: 'ScrollPane',\n data() {\n return {\n left: 0\n }\n },\n computed: {\n scrollWrapper() {\n return this.$refs.scrollContainer.$refs.wrap\n }\n },\n mounted() {\n this.scrollWrapper.addEventListener('scroll', this.emitScroll, true)\n },\n beforeDestroy() {\n this.scrollWrapper.removeEventListener('scroll', this.emitScroll)\n },\n methods: {\n handleScroll(e) {\n const eventDelta = e.wheelDelta || -e.deltaY * 40\n const $scrollWrapper = this.scrollWrapper\n $scrollWrapper.scrollLeft = $scrollWrapper.scrollLeft + eventDelta / 4\n },\n emitScroll() {\n this.$emit('scroll')\n },\n moveToTarget(currentTag) {\n const $container = this.$refs.scrollContainer.$el\n const $containerWidth = $container.offsetWidth\n const $scrollWrapper = this.scrollWrapper\n const tagList = this.$parent.$refs.tag\n\n let firstTag = null\n let lastTag = null\n\n // find first tag and last tag\n if (tagList.length > 0) {\n firstTag = tagList[0]\n lastTag = tagList[tagList.length - 1]\n }\n\n if (firstTag === currentTag) {\n $scrollWrapper.scrollLeft = 0\n } else if (lastTag === currentTag) {\n $scrollWrapper.scrollLeft = $scrollWrapper.scrollWidth - $containerWidth\n } else {\n // find preTag and nextTag\n const currentIndex = tagList.findIndex(item => item === currentTag)\n const prevTag = tagList[currentIndex - 1]\n const nextTag = tagList[currentIndex + 1]\n\n // the tag's offsetLeft after of nextTag\n const afterNextTagOffsetLeft = nextTag.$el.offsetLeft + nextTag.$el.offsetWidth + tagAndTagSpacing\n\n // the tag's offsetLeft before of prevTag\n const beforePrevTagOffsetLeft = prevTag.$el.offsetLeft - tagAndTagSpacing\n\n if (afterNextTagOffsetLeft > $scrollWrapper.scrollLeft + $containerWidth) {\n $scrollWrapper.scrollLeft = afterNextTagOffsetLeft - $containerWidth\n } else if (beforePrevTagOffsetLeft < $scrollWrapper.scrollLeft) {\n $scrollWrapper.scrollLeft = beforePrevTagOffsetLeft\n }\n }\n }\n }\n}\n</script>\n\n<style lang=\"scss\" scoped>\n.scroll-container {\n white-space: nowrap;\n position: relative;\n overflow: hidden;\n width: 100%;\n ::v-deep {\n .el-scrollbar__bar {\n bottom: 0px;\n }\n .el-scrollbar__wrap {\n height: 49px;\n }\n }\n}\n</style>\n"]}]}
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