zhangmeng
2024-04-19 e3ba120cb766a17e098e58d11c39ffc600a3070c
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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>