| 提交 | 用户 | age | ||
| 2a61f6 | 1 | <template> |
| L | 2 | <el-scrollbar ref="scrollContainer" :vertical="false" class="scroll-container" @wheel.native.prevent="handleScroll"> |
| 3 | <slot /> | |
| 4 | </el-scrollbar> | |
| 5 | </template> | |
| 6 | ||
| 7 | <script> | |
| 8 | const tagAndTagSpacing = 4 // tagAndTagSpacing | |
| 9 | ||
| 10 | export default { | |
| 11 | name: 'ScrollPane', | |
| 12 | data() { | |
| 13 | return { | |
| 14 | left: 0 | |
| 15 | } | |
| 16 | }, | |
| 17 | computed: { | |
| 18 | scrollWrapper() { | |
| 19 | return this.$refs.scrollContainer.$refs.wrap | |
| 20 | } | |
| 21 | }, | |
| 22 | mounted() { | |
| 23 | this.scrollWrapper.addEventListener('scroll', this.emitScroll, true) | |
| 24 | }, | |
| 25 | beforeDestroy() { | |
| 26 | this.scrollWrapper.removeEventListener('scroll', this.emitScroll) | |
| 27 | }, | |
| 28 | methods: { | |
| 29 | handleScroll(e) { | |
| 30 | const eventDelta = e.wheelDelta || -e.deltaY * 40 | |
| 31 | const $scrollWrapper = this.scrollWrapper | |
| 32 | $scrollWrapper.scrollLeft = $scrollWrapper.scrollLeft + eventDelta / 4 | |
| 33 | }, | |
| 34 | emitScroll() { | |
| 35 | this.$emit('scroll') | |
| 36 | }, | |
| 37 | moveToTarget(currentTag) { | |
| 38 | const $container = this.$refs.scrollContainer.$el | |
| 39 | const $containerWidth = $container.offsetWidth | |
| 40 | const $scrollWrapper = this.scrollWrapper | |
| 41 | const tagList = this.$parent.$refs.tag | |
| 42 | ||
| 43 | let firstTag = null | |
| 44 | let lastTag = null | |
| 45 | ||
| 46 | // find first tag and last tag | |
| 47 | if (tagList.length > 0) { | |
| 48 | firstTag = tagList[0] | |
| 49 | lastTag = tagList[tagList.length - 1] | |
| 50 | } | |
| 51 | ||
| 52 | if (firstTag === currentTag) { | |
| 53 | $scrollWrapper.scrollLeft = 0 | |
| 54 | } else if (lastTag === currentTag) { | |
| 55 | $scrollWrapper.scrollLeft = $scrollWrapper.scrollWidth - $containerWidth | |
| 56 | } else { | |
| 57 | // find preTag and nextTag | |
| 58 | const currentIndex = tagList.findIndex(item => item === currentTag) | |
| 59 | const prevTag = tagList[currentIndex - 1] | |
| 60 | const nextTag = tagList[currentIndex + 1] | |
| 61 | ||
| 62 | // the tag's offsetLeft after of nextTag | |
| 63 | const afterNextTagOffsetLeft = nextTag.$el.offsetLeft + nextTag.$el.offsetWidth + tagAndTagSpacing | |
| 64 | ||
| 65 | // the tag's offsetLeft before of prevTag | |
| 66 | const beforePrevTagOffsetLeft = prevTag.$el.offsetLeft - tagAndTagSpacing | |
| 67 | ||
| 68 | if (afterNextTagOffsetLeft > $scrollWrapper.scrollLeft + $containerWidth) { | |
| 69 | $scrollWrapper.scrollLeft = afterNextTagOffsetLeft - $containerWidth | |
| 70 | } else if (beforePrevTagOffsetLeft < $scrollWrapper.scrollLeft) { | |
| 71 | $scrollWrapper.scrollLeft = beforePrevTagOffsetLeft | |
| 72 | } | |
| 73 | } | |
| 74 | } | |
| 75 | } | |
| 76 | } | |
| 77 | </script> | |
| 78 | ||
| 79 | <style lang="scss" scoped> | |
| 80 | .scroll-container { | |
| 81 | white-space: nowrap; | |
| 82 | position: relative; | |
| 83 | overflow: hidden; | |
| 84 | width: 100%; | |
| 85 | ::v-deep { | |
| 86 | .el-scrollbar__bar { | |
| 87 | bottom: 0px; | |
| 88 | } | |
| 89 | .el-scrollbar__wrap { | |
| 90 | height: 49px; | |
| 91 | } | |
| 92 | } | |
| 93 | } | |
| 94 | </style> | |
