118 lines
2.5 KiB
JavaScript
118 lines
2.5 KiB
JavaScript
// Styles
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import "../../../src/components/VVirtualScroll/VVirtualScroll.sass"; // Mixins
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import Measurable from '../../mixins/measurable'; // Directives
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import Scroll from '../../directives/scroll'; // Utilities
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import { convertToUnit, getSlot } from '../../util/helpers';
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export default Measurable.extend({
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name: 'v-virtual-scroll',
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directives: {
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Scroll
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},
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props: {
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bench: {
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type: [Number, String],
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default: 0
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},
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itemHeight: {
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type: [Number, String],
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required: true
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},
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items: {
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type: Array,
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default: () => []
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}
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},
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data: () => ({
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first: 0,
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last: 0,
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scrollTop: 0
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}),
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computed: {
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__bench() {
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return parseInt(this.bench, 10);
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},
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__itemHeight() {
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return parseInt(this.itemHeight, 10);
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},
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firstToRender() {
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return Math.max(0, this.first - this.__bench);
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},
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lastToRender() {
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return Math.min(this.items.length, this.last + this.__bench);
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}
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},
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watch: {
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height: 'onScroll',
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itemHeight: 'onScroll'
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},
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mounted() {
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this.last = this.getLast(0);
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},
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methods: {
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getChildren() {
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return this.items.slice(this.firstToRender, this.lastToRender).map(this.genChild);
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},
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genChild(item, index) {
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index += this.firstToRender;
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const top = convertToUnit(index * this.__itemHeight);
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return this.$createElement('div', {
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staticClass: 'v-virtual-scroll__item',
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style: {
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top
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},
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key: index
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}, getSlot(this, 'default', {
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index,
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item
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}));
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},
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getFirst() {
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return Math.floor(this.scrollTop / this.__itemHeight);
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},
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getLast(first) {
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const height = parseInt(this.height || 0, 10) || this.$el.clientHeight;
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return first + Math.ceil(height / this.__itemHeight);
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},
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onScroll() {
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this.scrollTop = this.$el.scrollTop;
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this.first = this.getFirst();
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this.last = this.getLast(this.first);
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}
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},
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render(h) {
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const content = h('div', {
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staticClass: 'v-virtual-scroll__container',
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style: {
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height: convertToUnit(this.items.length * this.__itemHeight)
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}
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}, this.getChildren());
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return h('div', {
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staticClass: 'v-virtual-scroll',
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style: this.measurableStyles,
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directives: [{
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name: 'scroll',
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modifiers: {
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self: true
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},
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value: this.onScroll
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}]
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}, [content]);
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}
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});
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//# sourceMappingURL=VVirtualScroll.js.map
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