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256 lines
8.4 KiB
256 lines
8.4 KiB
2 years ago
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<template>
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<view
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class="u-swiper"
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:style="{
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backgroundColor: bgColor,
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height: $u.addUnit(height),
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borderRadius: $u.addUnit(radius)
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}"
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>
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<view
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class="u-swiper__loading"
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v-if="loading"
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>
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<u-loading-icon mode="circle"></u-loading-icon>
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</view>
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<swiper
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v-else
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class="u-swiper__wrapper"
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:style="{
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height: $u.addUnit(height),
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}"
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@change="change"
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:circular="circular"
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:interval="interval"
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:duration="duration"
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:autoplay="autoplay"
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:current="current"
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:currentItemId="currentItemId"
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:previousMargin="$u.addUnit(previousMargin)"
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:nextMargin="$u.addUnit(nextMargin)"
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:acceleration="acceleration"
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:displayMultipleItems="displayMultipleItems"
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:easingFunction="easingFunction"
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>
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<swiper-item
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class="u-swiper__wrapper__item"
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v-for="(item, index) in list"
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:key="index"
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>
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<view
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class="u-swiper__wrapper__item__wrapper"
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:style="[itemStyle(index)]"
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>
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<!-- 在nvue中，image图片的宽度默认为屏幕宽度，需要通过flex:1撑开，另外必须设置高度才能显示图片 -->
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<image
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class="u-swiper__wrapper__item__wrapper__image"
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v-if="getItemType(item) === 'image'"
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:src="getSource(item)"
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:mode="imgMode"
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@tap="clickHandler(index)"
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:style="{
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height: $u.addUnit(height),
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borderRadius: $u.addUnit(radius)
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}"
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></image>
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<video
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class="u-swiper__wrapper__item__wrapper__video"
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v-if="getItemType(item) === 'video'"
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:id="`video-${index}`"
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:enable-progress-gesture="false"
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:src="getSource(item)"
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:poster="getPoster(item)"
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:title="showTitle && $u.test.object(item) && item.title ? item.title : ''"
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:style="{
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height: $u.addUnit(height)
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}"
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controls
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@tap="clickHandler(index)"
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></video>
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<text
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v-if="showTitle && $u.test.object(item) && item.title && $u.test.image(getSource(item))"
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class="u-swiper__wrapper__item__wrapper__title u-line-1"
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>{{ item.title }}</text>
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</view>
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</swiper-item>
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</swiper>
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<view class="u-swiper__indicator" :style="[$u.addStyle(indicatorStyle)]">
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<slot name="indicator">
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<u-swiper-indicator
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v-if="!loading && indicator && !showTitle"
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:indicatorActiveColor="indicatorActiveColor"
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:indicatorInactiveColor="indicatorInactiveColor"
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:length="list.length"
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:current="currentIndex"
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:indicatorMode="indicatorMode"
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></u-swiper-indicator>
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</slot>
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</view>
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</view>
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</template>
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<script>
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import props from './props.js';
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/**
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* Swiper 轮播图
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* @description 该组件一般用于导航轮播，广告展示等场景,可开箱即用，
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* @tutorial https://www.uviewui.com/components/swiper.html
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* @property {Array} list 轮播图数据
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* @property {Boolean} indicator 是否显示面板指示器（默认 false ）
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* @property {String} indicatorActiveColor 指示器非激活颜色（默认 '#FFFFFF' ）
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* @property {String} indicatorInactiveColor 指示器的激活颜色（默认 'rgba(255, 255, 255, 0.35)' ）
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* @property {String | Object} indicatorStyle 指示器样式，可通过bottom，left，right进行定位
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* @property {String} indicatorMode 指示器模式（默认 'line' ）
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* @property {Boolean} autoplay 是否自动切换（默认 true ）
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* @property {String | Number} current 当前所在滑块的 index（默认 0 ）
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* @property {String} currentItemId 当前所在滑块的 item-id ，不能与 current 被同时指定
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* @property {String | Number} interval 滑块自动切换时间间隔（ms）（默认 3000 ）
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* @property {String | Number} duration 滑块切换过程所需时间（ms）（默认 300 ）
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* @property {Boolean} circular 播放到末尾后是否重新回到开头（默认 false ）
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* @property {String | Number} previousMargin 前边距，可用于露出前一项的一小部分，nvue和支付宝不支持（默认 0 ）
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* @property {String | Number} nextMargin 后边距，可用于露出后一项的一小部分，nvue和支付宝不支持（默认 0 ）
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* @property {Boolean} acceleration 当开启时，会根据滑动速度，连续滑动多屏，支付宝不支持（默认 false ）
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* @property {Number} displayMultipleItems 同时显示的滑块数量，nvue、支付宝小程序不支持（默认 1 ）
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* @property {String} easingFunction 指定swiper切换缓动动画类型， 只对微信小程序有效（默认 'default' ）
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* @property {String} keyName list数组中指定对象的目标属性名（默认 'url' ）
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* @property {String} imgMode 图片的裁剪模式（默认 'aspectFill' ）
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* @property {String | Number} height 组件高度（默认 130 ）
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* @property {String} bgColor 背景颜色（默认 '#f3f4f6' ）
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* @property {String | Number} radius 组件圆角，数值或带单位的字符串（默认 4 ）
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* @property {Boolean} loading 是否加载中（默认 false ）
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* @property {Boolean} showTitle 是否显示标题，要求数组对象中有title属性（默认 false ）
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* @event {Function(index)} click 点击轮播图时触发 index：点击了第几张图片，从0开始
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* @event {Function(index)} change 轮播图切换时触发(自动或者手动切换) index：切换到了第几张图片，从0开始
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* @example <u-swiper :list="list4" keyName="url" :autoplay="false"></u-swiper>
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*/
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export default {
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name: 'u-swiper',
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mixins: [uni.$u.mpMixin, uni.$u.mixin, props],
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data() {
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return {
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currentIndex: 0
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}
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},
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watch: {
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current(val, preVal) {
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if(val === preVal) return;
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this.currentIndex = val; // 和上游数据关联上
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}
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},
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computed: {
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itemStyle() {
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return index => {
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const style = {}
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// #ifndef APP-NVUE || MP-TOUTIAO
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// 左右流出空间的写法不支持nvue和头条
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// 只有配置了此二值，才加上对应的圆角，以及缩放
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if (this.nextMargin && this.previousMargin) {
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style.borderRadius = uni.$u.addUnit(this.radius)
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if (index !== this.currentIndex) style.transform = 'scale(0.92)'
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}
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// #endif
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return style
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}
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}
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},
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methods: {
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getItemType(item) {
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if (typeof item === 'string') return uni.$u.test.video(this.getSource(item)) ? 'video' : 'image'
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if (typeof item === 'object' && this.keyName) {
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if (!item.type) return uni.$u.test.video(this.getSource(item)) ? 'video' : 'image'
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if (item.type === 'image') return 'image'
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if (item.type === 'video') return 'video'
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return 'image'
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}
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},
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// 获取目标路径，可能数组中为字符串，对象的形式，额外可指定对象的目标属性名keyName
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getSource(item) {
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if (typeof item === 'string') return item
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if (typeof item === 'object' && this.keyName) return item[this.keyName]
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else uni.$u.error('请按格式传递列表参数')
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return ''
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},
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// 轮播切换事件
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change(e) {
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// 当前的激活索引
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const {
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current
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} = e.detail
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this.pauseVideo(this.currentIndex)
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this.currentIndex = current
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this.$emit('change', e.detail)
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},
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// 切换轮播时，暂停视频播放
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pauseVideo(index) {
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const lastItem = this.getSource(this.list[index])
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if (uni.$u.test.video(lastItem)) {
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// 当视频隐藏时，暂停播放
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const video = uni.createVideoContext(`video-${index}`, this)
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video.pause()
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}
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},
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// 当一个轮播item为视频时，获取它的视频海报
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getPoster(item) {
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return typeof item === 'object' && item.poster ? item.poster : ''
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},
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// 点击某个item
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clickHandler(index) {
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this.$emit('click', index)
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}
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},
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}
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</script>
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<style lang="scss" scoped>
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@import "../../libs/css/components.scss";
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.u-swiper {
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@include flex;
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justify-content: center;
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align-items: center;
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position: relative;
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overflow: hidden;
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&__wrapper {
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flex: 1;
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&__item {
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flex: 1;
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&__wrapper {
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@include flex;
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position: relative;
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overflow: hidden;
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transition: transform 0.3s;
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flex: 1;
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&__image {
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flex: 1;
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}
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&__video {
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flex: 1;
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}
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&__title {
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position: absolute;
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background-color: rgba(0, 0, 0, 0.3);
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bottom: 0;
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left: 0;
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right: 0;
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font-size: 28rpx;
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padding: 12rpx 24rpx;
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color: #FFFFFF;
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flex: 1;
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}
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}
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}
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}
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&__indicator {
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position: absolute;
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bottom: 10px;
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}
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}
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</style>
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