<template> 
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    <view class="u-avatar-group"> 
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        <view 
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            class="u-avatar-group__item" 
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            v-for="(item, index) in showUrl" 
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            :key="index" 
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            :style="{ 
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                marginLeft: index === 0 ? 0 : $u.addUnit(-size * gap) 
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            }" 
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        > 
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            <u-avatar 
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                :size="size" 
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                :shape="shape" 
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                :mode="mode" 
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                :src="$u.test.object(item) ? keyName && item[keyName] || item.url : item" 
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            ></u-avatar> 
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            <view 
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                class="u-avatar-group__item__show-more" 
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                v-if="showMore && index === showUrl.length - 1 && (urls.length > maxCount || extraValue > 0)" 
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                @tap="clickHandler" 
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            > 
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                <u--text 
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                    color="#ffffff" 
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                    :size="size * 0.4" 
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                    :text="`+${extraValue || urls.length - showUrl.length}`" 
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                    align="center" 
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                    customStyle="justify-content: center" 
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                ></u--text> 
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            </view> 
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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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     * AvatarGroup  头像组 
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     * @description 本组件一般用于展示头像的地方,如个人中心,或者评论列表页的用户头像展示等场所。 
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     * @tutorial https://www.uviewui.com/components/avatar.html 
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     *  
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     * @property {Array}           urls     头像图片组 (默认 [] ) 
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     * @property {String | Number} maxCount 最多展示的头像数量 ( 默认 5 ) 
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     * @property {String}          shape    头像形状( 'circle' (默认) | 'square' ) 
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     * @property {String}          mode     图片裁剪模式(默认 'scaleToFill' ) 
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     * @property {Boolean}         showMore 超出maxCount时是否显示查看更多的提示 (默认 true ) 
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     * @property {String | Number} size      头像大小 (默认 40 ) 
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     * @property {String}          keyName  指定从数组的对象元素中读取哪个属性作为图片地址  
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     * @property {String | Number} gap      头像之间的遮挡比例(0.4代表遮挡40%)  (默认 0.5 ) 
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     * @property {String | Number} extraValue  需额外显示的值 
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     * @event    {Function}        showMore 头像组更多点击 
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     * @example  <u-avatar-group:urls="urls" size="35" gap="0.4" ></u-avatar-group:urls=> 
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     */ 
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    export default { 
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        name: 'u-avatar-group', 
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        mixins: [uni.$u.mpMixin, uni.$u.mixin, props], 
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        data() { 
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            return { 
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            } 
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        }, 
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        computed: { 
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            showUrl() { 
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                return this.urls.slice(0, this.maxCount) 
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            } 
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        }, 
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        methods: { 
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            clickHandler() { 
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                this.$emit('showMore') 
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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-avatar-group { 
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        @include flex; 
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        &__item { 
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            margin-left: -10px; 
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            position: relative; 
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            &--no-indent { 
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                // 如果你想质疑作者不会使用:first-child,说明你太年轻,因为nvue不支持 
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                margin-left: 0; 
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            } 
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            &__show-more { 
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                position: absolute; 
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                top: 0; 
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                bottom: 0; 
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                left: 0; 
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                right: 0; 
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                background-color: rgba(0, 0, 0, 0.3); 
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                @include flex; 
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                align-items: center; 
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                justify-content: center; 
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                border-radius: 100px; 
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            } 
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        } 
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    } 
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</style> 
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