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