| <!-- |
| |
| Licensed under the Apache License, Version 2.0 (the "License"); |
| you may not use this file except in compliance with the License. |
| You may obtain a copy of the License at |
| |
| http://www.apache.org/licenses/LICENSE-2.0 |
| |
| Unless required by applicable law or agreed to in writing, software |
| distributed under the License is distributed on an "AS IS" BASIS, |
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| See the License for the specific language governing permissions and |
| limitations under the License. |
| |
| --> |
| <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> |