<template>
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<div
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:class="carouselClasses"
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@mouseenter.stop="handleMouseEnter"
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@mouseleave.stop="handleMouseLeave">
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<div
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class="el-carousel__container"
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:style="{ height: height }">
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<transition
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v-if="arrowDisplay"
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name="carousel-arrow-left">
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<button
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type="button"
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v-show="(arrow === 'always' || hover) && (loop || activeIndex > 0)"
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@mouseenter="handleButtonEnter('left')"
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@mouseleave="handleButtonLeave"
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@click.stop="throttledArrowClick(activeIndex - 1)"
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class="el-carousel__arrow el-carousel__arrow--left">
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<i class="el-icon-arrow-left"></i>
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</button>
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</transition>
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<transition
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v-if="arrowDisplay"
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name="carousel-arrow-right">
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<button
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type="button"
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v-show="(arrow === 'always' || hover) && (loop || activeIndex < items.length - 1)"
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@mouseenter="handleButtonEnter('right')"
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@mouseleave="handleButtonLeave"
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@click.stop="throttledArrowClick(activeIndex + 1)"
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class="el-carousel__arrow el-carousel__arrow--right">
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<i class="el-icon-arrow-right"></i>
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</button>
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</transition>
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<slot></slot>
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</div>
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<ul
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v-if="indicatorPosition !== 'none'"
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:class="indicatorsClasses">
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<li
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v-for="(item, index) in items"
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:key="index"
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:class="[
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'el-carousel__indicator',
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'el-carousel__indicator--' + direction,
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{ 'is-active': index === activeIndex }]"
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@mouseenter="throttledIndicatorHover(index)"
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@click.stop="handleIndicatorClick(index)">
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<button class="el-carousel__button">
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<span v-if="hasLabel">{{ item.label }}</span>
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</button>
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</li>
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</ul>
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</div>
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</template>
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<script>
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import throttle from 'throttle-debounce/throttle';
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import { addResizeListener, removeResizeListener } from 'element-ui/src/utils/resize-event';
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export default {
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name: 'ElCarousel',
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props: {
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initialIndex: {
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type: Number,
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default: 0
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},
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height: String,
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trigger: {
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type: String,
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default: 'hover'
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},
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autoplay: {
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type: Boolean,
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default: true
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},
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interval: {
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type: Number,
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default: 3000
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},
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indicatorPosition: String,
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indicator: {
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type: Boolean,
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default: true
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},
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arrow: {
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type: String,
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default: 'hover'
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},
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type: String,
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loop: {
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type: Boolean,
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default: true
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},
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direction: {
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type: String,
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default: 'horizontal',
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validator(val) {
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return ['horizontal', 'vertical'].indexOf(val) !== -1;
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}
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}
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},
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data() {
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return {
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items: [],
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activeIndex: -1,
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containerWidth: 0,
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timer: null,
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hover: false
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};
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},
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computed: {
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arrowDisplay() {
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return this.arrow !== 'never' && this.direction !== 'vertical';
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},
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hasLabel() {
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return this.items.some(item => item.label.toString().length > 0);
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},
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carouselClasses() {
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const classes = ['el-carousel', 'el-carousel--' + this.direction];
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if (this.type === 'card') {
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classes.push('el-carousel--card');
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}
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return classes;
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},
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indicatorsClasses() {
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const classes = ['el-carousel__indicators', 'el-carousel__indicators--' + this.direction];
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if (this.hasLabel) {
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classes.push('el-carousel__indicators--labels');
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}
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if (this.indicatorPosition === 'outside' || this.type === 'card') {
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classes.push('el-carousel__indicators--outside');
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}
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return classes;
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}
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},
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watch: {
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items(val) {
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if (val.length > 0) this.setActiveItem(this.initialIndex);
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},
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activeIndex(val, oldVal) {
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this.resetItemPosition(oldVal);
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if (oldVal > -1) {
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this.$emit('change', val, oldVal);
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}
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},
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autoplay(val) {
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val ? this.startTimer() : this.pauseTimer();
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},
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loop() {
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this.setActiveItem(this.activeIndex);
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},
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interval() {
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this.pauseTimer();
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this.startTimer();
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}
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},
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methods: {
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handleMouseEnter() {
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this.hover = true;
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this.pauseTimer();
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},
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handleMouseLeave() {
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this.hover = false;
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this.startTimer();
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},
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itemInStage(item, index) {
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const length = this.items.length;
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if (index === length - 1 && item.inStage && this.items[0].active ||
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(item.inStage && this.items[index + 1] && this.items[index + 1].active)) {
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return 'left';
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} else if (index === 0 && item.inStage && this.items[length - 1].active ||
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(item.inStage && this.items[index - 1] && this.items[index - 1].active)) {
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return 'right';
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}
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return false;
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},
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handleButtonEnter(arrow) {
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if (this.direction === 'vertical') return;
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this.items.forEach((item, index) => {
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if (arrow === this.itemInStage(item, index)) {
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item.hover = true;
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}
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});
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},
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handleButtonLeave() {
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if (this.direction === 'vertical') return;
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this.items.forEach(item => {
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item.hover = false;
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});
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},
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updateItems() {
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this.items = this.$children.filter(child => child.$options.name === 'ElCarouselItem');
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},
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resetItemPosition(oldIndex) {
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this.items.forEach((item, index) => {
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item.translateItem(index, this.activeIndex, oldIndex);
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});
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},
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playSlides() {
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if (this.activeIndex < this.items.length - 1) {
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this.activeIndex++;
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} else if (this.loop) {
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this.activeIndex = 0;
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}
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},
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pauseTimer() {
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if (this.timer) {
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clearInterval(this.timer);
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this.timer = null;
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}
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},
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startTimer() {
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if (this.interval <= 0 || !this.autoplay || this.timer) return;
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this.timer = setInterval(this.playSlides, this.interval);
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},
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resetTimer() {
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this.pauseTimer();
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this.startTimer();
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},
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setActiveItem(index) {
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if (typeof index === 'string') {
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const filteredItems = this.items.filter(item => item.name === index);
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if (filteredItems.length > 0) {
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index = this.items.indexOf(filteredItems[0]);
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}
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}
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index = Number(index);
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if (isNaN(index) || index !== Math.floor(index)) {
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console.warn('[Element Warn][Carousel]index must be an integer.');
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return;
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}
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let length = this.items.length;
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const oldIndex = this.activeIndex;
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if (index < 0) {
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this.activeIndex = this.loop ? length - 1 : 0;
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} else if (index >= length) {
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this.activeIndex = this.loop ? 0 : length - 1;
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} else {
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this.activeIndex = index;
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}
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if (oldIndex === this.activeIndex) {
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this.resetItemPosition(oldIndex);
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}
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this.resetTimer();
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},
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prev() {
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this.setActiveItem(this.activeIndex - 1);
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},
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next() {
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this.setActiveItem(this.activeIndex + 1);
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},
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handleIndicatorClick(index) {
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this.activeIndex = index;
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},
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handleIndicatorHover(index) {
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if (this.trigger === 'hover' && index !== this.activeIndex) {
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this.activeIndex = index;
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}
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}
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},
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created() {
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this.throttledArrowClick = throttle(300, true, index => {
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this.setActiveItem(index);
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});
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this.throttledIndicatorHover = throttle(300, index => {
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this.handleIndicatorHover(index);
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});
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},
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mounted() {
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this.updateItems();
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this.$nextTick(() => {
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addResizeListener(this.$el, this.resetItemPosition);
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if (this.initialIndex < this.items.length && this.initialIndex >= 0) {
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this.activeIndex = this.initialIndex;
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}
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this.startTimer();
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});
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},
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beforeDestroy() {
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if (this.$el) removeResizeListener(this.$el, this.resetItemPosition);
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this.pauseTimer();
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}
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};
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</script>
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