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94 lines
2.7 KiB
94 lines
2.7 KiB
<template> |
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<el-scrollbar ref="scrollContainer" :vertical="false" class="scroll-container" @wheel.native.prevent="handleScroll"> |
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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) { |
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const $container = this.$refs.scrollContainer.$el |
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const $containerWidth = $container.offsetWidth |
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const $scrollWrapper = this.scrollWrapper |
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const tagList = this.$parent.$refs.tag |
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let firstTag = null |
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let lastTag = null |
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// find first tag and last tag |
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if (tagList.length > 0) { |
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firstTag = tagList[0] |
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lastTag = tagList[tagList.length - 1] |
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} |
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if (firstTag === currentTag) { |
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$scrollWrapper.scrollLeft = 0 |
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} else if (lastTag === currentTag) { |
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$scrollWrapper.scrollLeft = $scrollWrapper.scrollWidth - $containerWidth |
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} else { |
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// find preTag and nextTag |
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const currentIndex = tagList.findIndex(item => item === currentTag) |
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const prevTag = tagList[currentIndex - 1] |
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const nextTag = tagList[currentIndex + 1] |
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// the tag's offsetLeft after of nextTag |
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const afterNextTagOffsetLeft = nextTag.$el.offsetLeft + nextTag.$el.offsetWidth + tagAndTagSpacing |
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// the tag's offsetLeft before of prevTag |
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const beforePrevTagOffsetLeft = prevTag.$el.offsetLeft - tagAndTagSpacing |
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if (afterNextTagOffsetLeft > $scrollWrapper.scrollLeft + $containerWidth) { |
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$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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} |
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} |
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} |
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</style>
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