630 lines
25 KiB
Vue
630 lines
25 KiB
Vue
<template>
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<template v-if="!disabled">
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<div :ref="elementRef" :class="containerClass" :tabindex="tabindex" :style="style" @scroll="onScroll">
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<slot
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name="content"
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:styleClass="contentClass"
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:items="loadedItems"
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:getItemOptions="getOptions"
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:loading="d_loading"
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:getLoaderOptions="getLoaderOptions"
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:itemSize="itemSize"
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:rows="loadedRows"
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:columns="loadedColumns"
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:contentRef="contentRef"
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:spacerStyle="spacerStyle"
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:contentStyle="contentStyle"
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:vertical="isVertical()"
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:horizontal="isHorizontal()"
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:both="isBoth()"
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>
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<div :ref="contentRef" :class="contentClass" :style="contentStyle">
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<template v-for="(item, index) of loadedItems" :key="index">
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<slot name="item" :item="item" :options="getOptions(index)"></slot>
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</template>
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</div>
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</slot>
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<div v-if="showSpacer" class="p-virtualscroller-spacer" :style="spacerStyle"></div>
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<div v-if="!loaderDisabled && showLoader && d_loading" :class="loaderClass">
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<template v-if="$slots && $slots.loader">
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<template v-for="(_, index) of loaderArr" :key="index">
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<slot name="loader" :options="getLoaderOptions(index, isBoth() && { numCols: d_numItemsInViewport.cols })"></slot>
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</template>
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</template>
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<i v-else class="p-virtualscroller-loading-icon pi pi-spinner pi-spin"></i>
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</div>
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</div>
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</template>
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<template v-else>
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<slot></slot>
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<slot name="content" :items="items" :rows="items" :columns="loadedColumns"></slot>
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</template>
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</template>
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<script>
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export default {
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name: 'VirtualScroller',
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emits: ['update:numToleratedItems', 'scroll', 'scroll-index-change', 'lazy-load'],
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props: {
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id: {
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type: String,
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default: null
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},
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style: null,
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class: null,
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items: {
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type: Array,
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default: null
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},
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itemSize: {
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type: [Number, Array],
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default: 0
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},
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scrollHeight: null,
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scrollWidth: null,
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orientation: {
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type: String,
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default: 'vertical'
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},
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numToleratedItems: {
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type: Number,
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default: null
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},
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delay: {
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type: Number,
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default: 0
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},
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lazy: {
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type: Boolean,
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default: false
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},
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disabled: {
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type: Boolean,
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default: false
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},
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loaderDisabled: {
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type: Boolean,
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default: false
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},
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columns: {
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type: Array,
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default: null
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},
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loading: {
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type: Boolean,
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default: false
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},
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showSpacer: {
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type: Boolean,
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default: true
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},
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showLoader: {
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type: Boolean,
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default: false
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},
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tabindex: {
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type: Number,
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default: 0
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}
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},
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data() {
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return {
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first: this.isBoth() ? { rows: 0, cols: 0 } : 0,
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last: this.isBoth() ? { rows: 0, cols: 0 } : 0,
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numItemsInViewport: this.isBoth() ? { rows: 0, cols: 0 } : 0,
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lastScrollPos: this.isBoth() ? { top: 0, left: 0 } : 0,
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d_numToleratedItems: this.numToleratedItems,
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d_loading: this.loading,
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loaderArr: [],
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spacerStyle: {},
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contentStyle: {}
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};
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},
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element: null,
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content: null,
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lastScrollPos: null,
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scrollTimeout: null,
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watch: {
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numToleratedItems(newValue) {
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this.d_numToleratedItems = newValue;
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},
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loading(newValue) {
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this.d_loading = newValue;
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},
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items(newValue, oldValue) {
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if (!oldValue || oldValue.length !== (newValue || []).length) {
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this.init();
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}
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},
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orientation() {
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this.lastScrollPos = this.isBoth() ? { top: 0, left: 0 } : 0;
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}
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},
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mounted() {
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this.init();
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this.lastScrollPos = this.isBoth() ? { top: 0, left: 0 } : 0;
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},
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methods: {
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init() {
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this.setSize();
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this.calculateOptions();
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this.setSpacerSize();
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},
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isVertical() {
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return this.orientation === 'vertical';
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},
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isHorizontal() {
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return this.orientation === 'horizontal';
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},
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isBoth() {
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return this.orientation === 'both';
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},
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scrollTo(options) {
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this.element && this.element.scrollTo(options);
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},
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scrollToIndex(index, behavior = 'auto') {
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const both = this.isBoth();
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const horizontal = this.isHorizontal();
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const first = this.first;
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const { numToleratedItems } = this.calculateNumItems();
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const itemSize = this.itemSize;
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const calculateFirst = (_index = 0, _numT) => (_index <= _numT ? 0 : _index);
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const calculateCoord = (_first, _size) => _first * _size;
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const scrollTo = (left = 0, top = 0) => this.scrollTo({ left, top, behavior });
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if (both) {
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const newFirst = { rows: calculateFirst(index[0], numToleratedItems[0]), cols: calculateFirst(index[1], numToleratedItems[1]) };
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if (newFirst.rows !== first.rows || newFirst.cols !== first.cols) {
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scrollTo(calculateCoord(newFirst.cols, itemSize[1]), calculateCoord(newFirst.rows, itemSize[0]));
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}
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} else {
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const newFirst = calculateFirst(index, numToleratedItems);
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if (newFirst !== first) {
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horizontal ? scrollTo(calculateCoord(newFirst, itemSize), 0) : scrollTo(0, calculateCoord(newFirst, itemSize));
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}
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}
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},
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scrollInView(index, to, behavior = 'auto') {
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if (to) {
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const both = this.isBoth();
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const horizontal = this.isHorizontal();
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const { first, viewport } = this.getRenderedRange();
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const scrollTo = (left = 0, top = 0) => this.scrollTo({ left, top, behavior });
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const isToStart = to === 'to-start';
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const isToEnd = to === 'to-end';
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if (isToStart) {
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if (both) {
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if (viewport.first.rows - first.rows > index[0]) {
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scrollTo(viewport.first.cols * this.itemSize[1], (viewport.first.rows - 1) * this.itemSize[0]);
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} else if (viewport.first.cols - first.cols > index[1]) {
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scrollTo((viewport.first.cols - 1) * this.itemSize[1], viewport.first.rows * this.itemSize[0]);
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}
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} else {
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if (viewport.first - first > index) {
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const pos = (viewport.first - 1) * this.itemSize;
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horizontal ? scrollTo(pos, 0) : scrollTo(0, pos);
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}
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}
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} else if (isToEnd) {
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if (both) {
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if (viewport.last.rows - first.rows <= index[0] + 1) {
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scrollTo(viewport.first.cols * this.itemSize[1], (viewport.first.rows + 1) * this.itemSize[0]);
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} else if (viewport.last.cols - first.cols <= index[1] + 1) {
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scrollTo((viewport.first.cols + 1) * this.itemSize[1], viewport.first.rows * this.itemSize[0]);
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}
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} else {
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if (viewport.last - first <= index + 1) {
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const pos = (viewport.first + 1) * this.itemSize;
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horizontal ? scrollTo(pos, 0) : scrollTo(0, pos);
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}
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}
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}
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} else {
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this.scrollToIndex(index, behavior);
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}
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},
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getRenderedRange() {
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const calculateFirstInViewport = (_pos, _size) => Math.floor(_pos / (_size || _pos));
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let firstInViewport = this.first;
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let lastInViewport = 0;
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if (this.element) {
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const both = this.isBoth();
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const horizontal = this.isHorizontal();
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const scrollTop = this.element.scrollTop;
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const scrollLeft = this.element.scrollLeft;
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if (both) {
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firstInViewport = { rows: calculateFirstInViewport(scrollTop, this.itemSize[0]), cols: calculateFirstInViewport(scrollLeft, this.itemSize[1]) };
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lastInViewport = { rows: firstInViewport.rows + this.numItemsInViewport.rows, cols: firstInViewport.cols + this.numItemsInViewport.cols };
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} else {
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const scrollPos = horizontal ? scrollLeft : scrollTop;
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firstInViewport = calculateFirstInViewport(scrollPos, this.itemSize);
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lastInViewport = firstInViewport + this.numItemsInViewport;
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}
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}
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return {
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first: this.first,
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last: this.last,
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viewport: {
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first: firstInViewport,
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last: lastInViewport
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}
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};
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},
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calculateNumItems() {
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const both = this.isBoth();
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const horizontal = this.isHorizontal();
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const itemSize = this.itemSize;
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const contentPos = this.getContentPosition();
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const contentWidth = this.element ? this.element.offsetWidth - contentPos.left : 0;
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const contentHeight = this.element ? this.element.offsetHeight - contentPos.top : 0;
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const calculateNumItemsInViewport = (_contentSize, _itemSize) => Math.ceil(_contentSize / (_itemSize || _contentSize));
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const calculateNumToleratedItems = (_numItems) => Math.ceil(_numItems / 2);
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const numItemsInViewport = both
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? { rows: calculateNumItemsInViewport(contentHeight, itemSize[0]), cols: calculateNumItemsInViewport(contentWidth, itemSize[1]) }
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: calculateNumItemsInViewport(horizontal ? contentWidth : contentHeight, itemSize);
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const numToleratedItems = this.d_numToleratedItems || (both ? [calculateNumToleratedItems(numItemsInViewport.rows), calculateNumToleratedItems(numItemsInViewport.cols)] : calculateNumToleratedItems(numItemsInViewport));
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return { numItemsInViewport, numToleratedItems };
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},
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calculateOptions() {
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const both = this.isBoth();
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const first = this.first;
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const { numItemsInViewport, numToleratedItems } = this.calculateNumItems();
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const calculateLast = (_first, _num, _numT, _isCols) => this.getLast(_first + _num + (_first < _numT ? 2 : 3) * _numT, _isCols);
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const last = both
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? { rows: calculateLast(first.rows, numItemsInViewport.rows, numToleratedItems[0]), cols: calculateLast(first.cols, numItemsInViewport.cols, numToleratedItems[1], true) }
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: calculateLast(first, numItemsInViewport, numToleratedItems);
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this.last = last;
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this.numItemsInViewport = numItemsInViewport;
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this.d_numToleratedItems = numToleratedItems;
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this.$emit('update:numToleratedItems', this.d_numToleratedItems);
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if (this.showLoader) {
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this.loaderArr = both ? Array.from({ length: numItemsInViewport.rows }).map(() => Array.from({ length: numItemsInViewport.cols })) : Array.from({ length: numItemsInViewport });
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}
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if (this.lazy) {
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this.$emit('lazy-load', { first, last });
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}
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},
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getLast(last = 0, isCols) {
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if (this.items) {
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return Math.min(isCols ? (this.columns || this.items[0]).length : this.items.length, last);
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}
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return 0;
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},
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getContentPosition() {
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if (this.content) {
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const style = getComputedStyle(this.content);
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const left = parseInt(style.paddingLeft, 10) + Math.max(parseInt(style.left, 10), 0);
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const right = parseInt(style.paddingRight, 10) + Math.max(parseInt(style.right, 10), 0);
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const top = parseInt(style.paddingTop, 10) + Math.max(parseInt(style.top, 10), 0);
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const bottom = parseInt(style.paddingBottom, 10) + Math.max(parseInt(style.bottom, 10), 0);
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return { left, right, top, bottom, x: left + right, y: top + bottom };
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}
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return { left: 0, right: 0, top: 0, bottom: 0, x: 0, y: 0 };
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},
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setSize() {
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if (this.element) {
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const both = this.isBoth();
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const horizontal = this.isHorizontal();
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const parentElement = this.element.parentElement;
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const width = this.scrollWidth || `${this.element.offsetWidth || parentElement.offsetWidth}px`;
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const height = this.scrollHeight || `${this.element.offsetHeight || parentElement.offsetHeight}px`;
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const setProp = (_name, _value) => (this.element.style[_name] = _value);
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if (both || horizontal) {
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setProp('height', height);
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setProp('width', width);
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} else {
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setProp('height', height);
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}
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}
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},
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setSpacerSize() {
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const items = this.items;
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if (items) {
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const both = this.isBoth();
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const horizontal = this.isHorizontal();
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const contentPos = this.getContentPosition();
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const setProp = (_name, _value, _size, _cpos = 0) => (this.spacerStyle = { ...this.spacerStyle, ...{ [`${_name}`]: (_value || []).length * _size + _cpos + 'px' } });
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if (both) {
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setProp('height', items, this.itemSize[0], contentPos.y);
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setProp('width', this.columns || items[1], this.itemSize[1], contentPos.x);
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} else {
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horizontal ? setProp('width', this.columns || items, this.itemSize, contentPos.x) : setProp('height', items, this.itemSize, contentPos.y);
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}
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}
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},
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setContentPosition(pos) {
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if (this.content) {
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const both = this.isBoth();
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const horizontal = this.isHorizontal();
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const first = pos ? pos.first : this.first;
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const calculateTranslateVal = (_first, _size) => _first * _size;
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const setTransform = (_x = 0, _y = 0) => {
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this.contentStyle = { ...this.contentStyle, ...{ transform: `translate3d(${_x}px, ${_y}px, 0)` } };
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};
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if (both) {
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setTransform(calculateTranslateVal(first.cols, this.itemSize[1]), calculateTranslateVal(first.rows, this.itemSize[0]));
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} else {
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const translateVal = calculateTranslateVal(first, this.itemSize);
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horizontal ? setTransform(translateVal, 0) : setTransform(0, translateVal);
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}
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}
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},
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onScrollPositionChange(event) {
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const target = event.target;
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const both = this.isBoth();
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const horizontal = this.isHorizontal();
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const contentPos = this.getContentPosition();
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const calculateScrollPos = (_pos, _cpos) => (_pos ? (_pos > _cpos ? _pos - _cpos : _pos) : 0);
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const calculateCurrentIndex = (_pos, _size) => Math.floor(_pos / (_size || _pos));
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const calculateTriggerIndex = (_currentIndex, _first, _last, _num, _numT, _isScrollDownOrRight) => {
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return _currentIndex <= _numT ? _numT : _isScrollDownOrRight ? _last - _num - _numT : _first + _numT - 1;
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};
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const calculateFirst = (_currentIndex, _triggerIndex, _first, _last, _num, _numT, _isScrollDownOrRight) => {
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if (_currentIndex <= _numT) return 0;
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else return Math.max(0, _isScrollDownOrRight ? (_currentIndex < _triggerIndex ? _first : _currentIndex - _numT) : _currentIndex > _triggerIndex ? _first : _currentIndex - 2 * _numT);
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};
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const calculateLast = (_currentIndex, _first, _last, _num, _numT, _isCols) => {
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let lastValue = _first + _num + 2 * _numT;
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if (_currentIndex >= _numT) {
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lastValue += _numT + 1;
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}
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return this.getLast(lastValue, _isCols);
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};
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const scrollTop = calculateScrollPos(target.scrollTop, contentPos.top);
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const scrollLeft = calculateScrollPos(target.scrollLeft, contentPos.left);
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let newFirst = both ? { rows: 0, cols: 0 } : 0;
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let newLast = this.last;
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let isRangeChanged = false;
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let newScrollPos = this.lastScrollPos;
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if (both) {
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const isScrollDown = this.lastScrollPos.top <= scrollTop;
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const isScrollRight = this.lastScrollPos.left <= scrollLeft;
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const currentIndex = { rows: calculateCurrentIndex(scrollTop, this.itemSize[0]), cols: calculateCurrentIndex(scrollLeft, this.itemSize[1]) };
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const triggerIndex = {
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rows: calculateTriggerIndex(currentIndex.rows, this.first.rows, this.last.rows, this.numItemsInViewport.rows, this.d_numToleratedItems[0], isScrollDown),
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cols: calculateTriggerIndex(currentIndex.cols, this.first.cols, this.last.cols, this.numItemsInViewport.cols, this.d_numToleratedItems[1], isScrollRight)
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};
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newFirst = {
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rows: calculateFirst(currentIndex.rows, triggerIndex.rows, this.first.rows, this.last.rows, this.numItemsInViewport.rows, this.d_numToleratedItems[0], isScrollDown),
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cols: calculateFirst(currentIndex.cols, triggerIndex.cols, this.first.cols, this.last.cols, this.numItemsInViewport.cols, this.d_numToleratedItems[1], isScrollRight)
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};
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newLast = {
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rows: calculateLast(currentIndex.rows, newFirst.rows, this.last.rows, this.numItemsInViewport.rows, this.d_numToleratedItems[0]),
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cols: calculateLast(currentIndex.cols, newFirst.cols, this.last.cols, this.numItemsInViewport.cols, this.d_numToleratedItems[1], true)
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};
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isRangeChanged = newFirst.rows !== this.first.rows || newLast.rows !== this.last.rows || newFirst.cols !== this.first.cols || newLast.cols !== this.last.cols;
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newScrollPos = { top: scrollTop, left: scrollLeft };
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} else {
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const scrollPos = horizontal ? scrollLeft : scrollTop;
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const isScrollDownOrRight = this.lastScrollPos <= scrollPos;
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const currentIndex = calculateCurrentIndex(scrollPos, this.itemSize);
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const triggerIndex = calculateTriggerIndex(currentIndex, this.first, this.last, this.numItemsInViewport, this.d_numToleratedItems, isScrollDownOrRight);
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newFirst = calculateFirst(currentIndex, triggerIndex, this.first, this.last, this.numItemsInViewport, this.d_numToleratedItems, isScrollDownOrRight);
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newLast = calculateLast(currentIndex, newFirst, this.last, this.numItemsInViewport, this.d_numToleratedItems);
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isRangeChanged = newFirst !== this.first || newLast !== this.last;
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newScrollPos = scrollPos;
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}
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return {
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first: newFirst,
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last: newLast,
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isRangeChanged,
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scrollPos: newScrollPos
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};
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},
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onScrollChange(event) {
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const { first, last, isRangeChanged, scrollPos } = this.onScrollPositionChange(event);
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if (isRangeChanged) {
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const newState = { first, last };
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|
|
this.setContentPosition(newState);
|
|
|
|
this.first = first;
|
|
this.last = last;
|
|
this.lastScrollPos = scrollPos;
|
|
|
|
this.$emit('scroll-index-change', newState);
|
|
|
|
if (this.lazy) {
|
|
this.$emit('lazy-load', newState);
|
|
}
|
|
}
|
|
},
|
|
onScroll(event) {
|
|
this.$emit('scroll', event);
|
|
|
|
if (this.delay) {
|
|
if (this.scrollTimeout) {
|
|
clearTimeout(this.scrollTimeout);
|
|
}
|
|
|
|
if (!this.d_loading && this.showLoader) {
|
|
const { isRangeChanged: changed } = this.onScrollPositionChange(event);
|
|
|
|
changed && (this.d_loading = true);
|
|
}
|
|
|
|
this.scrollTimeout = setTimeout(() => {
|
|
this.onScrollChange(event);
|
|
|
|
if (this.d_loading && this.showLoader && !this.lazy) {
|
|
this.d_loading = false;
|
|
}
|
|
}, this.delay);
|
|
} else {
|
|
this.onScrollChange(event);
|
|
}
|
|
},
|
|
getOptions(renderedIndex) {
|
|
const count = (this.items || []).length;
|
|
const index = this.isBoth() ? this.first.rows + renderedIndex : this.first + renderedIndex;
|
|
|
|
return {
|
|
index,
|
|
count,
|
|
first: index === 0,
|
|
last: index === count - 1,
|
|
even: index % 2 === 0,
|
|
odd: index % 2 !== 0
|
|
};
|
|
},
|
|
getLoaderOptions(index, extOptions) {
|
|
let count = this.loaderArr.length;
|
|
|
|
return {
|
|
index,
|
|
count,
|
|
first: index === 0,
|
|
last: index === count - 1,
|
|
even: index % 2 === 0,
|
|
odd: index % 2 !== 0,
|
|
...extOptions
|
|
};
|
|
},
|
|
elementRef(el) {
|
|
this.element = el;
|
|
},
|
|
contentRef(el) {
|
|
this.content = el;
|
|
}
|
|
},
|
|
computed: {
|
|
containerClass() {
|
|
return [
|
|
'p-virtualscroller',
|
|
{
|
|
'p-both-scroll': this.isBoth(),
|
|
'p-horizontal-scroll': this.isHorizontal()
|
|
},
|
|
this.class
|
|
];
|
|
},
|
|
contentClass() {
|
|
return [
|
|
'p-virtualscroller-content',
|
|
{
|
|
'p-virtualscroller-loading': this.d_loading
|
|
}
|
|
];
|
|
},
|
|
loaderClass() {
|
|
return [
|
|
'p-virtualscroller-loader',
|
|
{
|
|
'p-component-overlay': !this.$slots.loader
|
|
}
|
|
];
|
|
},
|
|
loadedItems() {
|
|
const items = this.items;
|
|
|
|
if (items && !this.d_loading) {
|
|
if (this.isBoth()) {
|
|
return items.slice(this.first.rows, this.last.rows).map((item) => (this.columns ? item : item.slice(this.first.cols, this.last.cols)));
|
|
} else if (this.isHorizontal() && this.columns) return items;
|
|
else return items.slice(this.first, this.last);
|
|
}
|
|
|
|
return [];
|
|
},
|
|
loadedRows() {
|
|
return this.d_loading ? (this.loaderDisabled ? this.loaderArr : []) : this.loadedItems;
|
|
},
|
|
loadedColumns() {
|
|
if (this.columns) {
|
|
const both = this.isBoth();
|
|
const horizontal = this.isHorizontal();
|
|
|
|
if (both || horizontal) {
|
|
return this.d_loading && this.loaderDisabled ? (both ? this.loaderArr[0] : this.loaderArr) : this.columns.slice(both ? this.first.cols : this.first, both ? this.last.cols : this.last);
|
|
}
|
|
}
|
|
|
|
return this.columns;
|
|
}
|
|
}
|
|
};
|
|
</script>
|
|
|
|
<style>
|
|
.p-virtualscroller {
|
|
position: relative;
|
|
overflow: auto;
|
|
contain: strict;
|
|
transform: translateZ(0);
|
|
will-change: scroll-position;
|
|
outline: 0 none;
|
|
}
|
|
|
|
.p-virtualscroller-content {
|
|
position: absolute;
|
|
top: 0;
|
|
left: 0;
|
|
contain: content;
|
|
min-height: 100%;
|
|
min-width: 100%;
|
|
will-change: transform;
|
|
}
|
|
|
|
.p-virtualscroller-spacer {
|
|
position: absolute;
|
|
top: 0;
|
|
left: 0;
|
|
height: 1px;
|
|
width: 1px;
|
|
transform-origin: 0 0;
|
|
pointer-events: none;
|
|
}
|
|
|
|
.p-virtualscroller .p-virtualscroller-loader {
|
|
position: sticky;
|
|
top: 0;
|
|
left: 0;
|
|
width: 100%;
|
|
height: 100%;
|
|
}
|
|
|
|
.p-virtualscroller-loader.p-component-overlay {
|
|
display: flex;
|
|
align-items: center;
|
|
justify-content: center;
|
|
}
|
|
</style>
|