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Removed virtual scroll package, implement custom virtual scroll Added offset prop Fix issue with scroll not being stopped and stop rerendering of already seen items Refresh items after they have been changed
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,112 @@ | ||
| <template> | ||
| <div class="vscroll-holder"> | ||
| <div | ||
| class="vscroll-spacer" | ||
| :style="{ | ||
| opacity: 0, | ||
| clear: 'both', | ||
| height: topHeight + 'px' | ||
| }" | ||
| /> | ||
| <slot :items="visibleItems" /> | ||
| <div | ||
| class="vscroll-spacer" | ||
| :style="{ | ||
| opacity: 0, | ||
| clear: 'both', | ||
| height: bottomHeight + 'px' | ||
| }" | ||
| /> | ||
| </div> | ||
| </template> | ||
|
|
||
| <script> | ||
| export default { | ||
| name: 'VirtualScroll', | ||
| props: { | ||
| items: { | ||
| type: Array, | ||
| required: true | ||
| }, | ||
| itemHeight: { | ||
| type: Number, | ||
| required: true | ||
| }, | ||
| offset: { | ||
| type: Number, | ||
| default: 5 | ||
| } | ||
| }, | ||
| data () { | ||
| return { | ||
| topHeight: 0, | ||
| bottomHeight: 0, | ||
| visibleItems: [], | ||
| lastRenderedItemIndex: 0 | ||
| } | ||
| }, | ||
| watch: { | ||
| items: function () { | ||
| this.refreshItems() | ||
| } | ||
| }, | ||
| mounted () { | ||
| this._checkScrollPosition = this.checkScrollPosition.bind(this) | ||
| this.checkScrollPosition() | ||
| this.$el.addEventListener('scroll', this._checkScrollPosition) | ||
| this.$el.addEventListener('wheel', this._checkScrollPosition) | ||
| }, | ||
| beforeDestroy () { | ||
| this.$el.removeEventListener('scroll', this._checkScrollPosition) | ||
| this.$el.removeEventListener('wheel', this._checkScrollPosition) | ||
| }, | ||
| methods: { | ||
| checkScrollPosition (e = {}) { | ||
| const el = this.$el | ||
| // prevent parent scroll | ||
| if ( | ||
| (el.scrollTop === 0 && e.deltaY < 0) || | ||
| (Math.abs(el.scrollTop - (el.scrollHeight - el.clientHeight)) <= 1 && | ||
| e.deltaY > 0) | ||
| ) { | ||
| e.preventDefault() | ||
| } | ||
| this.updateWindow(e) | ||
| }, | ||
| updateWindow () { | ||
| const visibleItemsCount = Math.ceil( | ||
| this.$el.clientHeight / this.itemHeight | ||
| ) | ||
| const totalScrollHeight = this.items.length * this.itemHeight | ||
| const scrollTop = this.$el.scrollTop | ||
| const firstVisibleIndex = Math.floor(scrollTop / this.itemHeight) | ||
| const lastVisibleIndex = firstVisibleIndex + visibleItemsCount | ||
| const lastCutIndex = lastVisibleIndex + this.offset | ||
| if (lastCutIndex > this.lastRenderedItemIndex) { | ||
| this.visibleItems = this.items.slice(0, lastCutIndex) | ||
| this.lastRenderedItemIndex = lastCutIndex | ||
| } | ||
| this.bottomHeight = | ||
| totalScrollHeight - | ||
| this.visibleItems.length * this.itemHeight - | ||
| this.topHeight | ||
| }, | ||
| refreshItems () { | ||
| this.visibleItems = this.items.slice(0, this.lastRenderedItemIndex) | ||
| } | ||
| } | ||
| } | ||
| </script> |
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