sgWaterfall.vue源码

<template>
    <ul :class="$options.name" :style="waterfallStyle">
        <li v-for="(a, i) in  items " :key="i" :style="a.style" :imgLoaded="a.imgLoaded">
            <template>
                <div class="cover">
                    <img :src="a.imgURL" @load="a.imgLoaded = true">
                </div>
                <label>{{ a.label }}</label>
            </template>
        </li>
    </ul>
</template>
    
<script>
export default {
    name: 'sgWaterfall',
    data() {
        return {
            imgLoadedStatus: [],
            items: [],
            waterfallStyle: {},
            __var_itemTextHeight: 0,
        }
    },
    props: [
        "data",
        "itemWidth",
        "itemMarginRight",
        "itemMarginBottom",
        "itemTextHeight",
        "webpageMargin",
    ],
    watch: {
        itemTextHeight: {
            handler(d) {
                this.__var_itemTextHeight = parseFloat(d) || 50;
                this.setProperty();
            }, deep: true, immediate: true,
        },
        data: {
            handler(d) {
                d && (this.items = this.calcAnyPhotosPosition(d));
            }, deep: true, immediate: true,
        },
    },
    destroyed() {
        removeEventListener('resize', this.resize);
    },
    mounted() {
        this.setProperty();
        addEventListener('resize', this.resize);
    },
    methods: {
        resize(e) {
            this.items = this.calcAnyPhotosPosition(this.items)
        },
        setProperty() {
            this.$el && this.$el.style.setProperty("--itemTextHeight", this.__var_itemTextHeight + 'px');
        },
        // BEGIN 计算图片的坐标位置_________________________________________________________
        // 计算能显示下多少列
        calcColsCount({ itemWidth, webpageMargin, itemMarginRight }) {
            return Math.floor((window.innerWidth - webpageMargin * 2 + itemMarginRight) / (itemWidth + itemMarginRight));
        },
        // 计算图片的坐标位置
        calcPhotoScaleWidthHeight(d, { itemWidth, itemTextHeight, defaultItemHeight, }) {
            // index是图片索引
            if (d.width && d.height) {
                let originWidth = d.width;//图片原始宽度
                let originHeight = d.height;//图片原始高度
                let proportion = originWidth / originHeight;//图片宽高比
                let scaleWidth = itemWidth;//缩放后的宽度
                let scaleHeight = scaleWidth / proportion;//缩放后的高度
                return {
                    width: scaleWidth,
                    height: scaleHeight + itemTextHeight,
                }
            } else {
                // 后台不提供高度数据的情况下（默认宽度高度，是个正方形）
                return {
                    width: itemWidth,
                    height: defaultItemHeight + itemTextHeight,
                }
            }
        },
        // 批量计算图片的坐标位置
        calcAnyPhotosPosition(arr) {
            arr = JSON.parse(JSON.stringify(arr));
            let itemWidth = parseFloat(this.itemWidth) || 250;//固定宽度
            let defaultItemHeight = itemWidth;//默认高度
            let itemMarginRight = parseFloat(this.itemMarginRight) || 20;//右侧间距
            let itemMarginBottom = parseFloat(this.itemMarginBottom) || 20;//底部间距
            let itemTextHeight = this.__var_itemTextHeight;//文本显示区域高度 
            let webpageMargin = parseFloat(this.webpageMargin) || 0;//网页左右两侧间距

            let colsCount = this.calcColsCount({ itemWidth, webpageMargin, itemMarginRight });//一共有多少列
            let colHeights = [...Array(colsCount)].map(v => 0);//列的高度数组
            arr.forEach(v => {
                let minHeight = Math.min(...colHeights);//找到高度最小的值
                let colIndex = colHeights.indexOf(minHeight);//找到高度最小的那一列
                let { width, height } = this.calcPhotoScaleWidthHeight(v, { itemWidth, itemTextHeight, defaultItemHeight, });
                let left = colIndex * (itemWidth + itemMarginRight);
                let top = minHeight + itemMarginBottom;
                colHeights[colIndex] += (height + itemMarginBottom);
                v.imgLoaded || (v.imgLoaded = false);//预加载图片使用响应式属性（这里不提前声明初始化，动态渲染数据的时候不会生效）
                v.style = {
                    left: left + 'px',
                    top: top + 'px',
                    width: width + 'px',
                    height: height + 'px',
                }
            });
            let waterfallWidth = (itemWidth + itemMarginRight) * colsCount - itemMarginRight;//计算容器宽度
            let waterfallHeight = this.scrollContainerHeight = Math.max(...colHeights);//计算容器高度
            this.waterfallStyle = {
                width: waterfallWidth + 'px',
                height: waterfallHeight + 'px',
            }
            return arr;
        },
        // END _________________________________________________________
    }
};
</script>
    
<style lang="scss" scoped>
.sgWaterfall {
    position: relative;
    overflow: hidden;
    margin: 0 auto;

    li {
        position: absolute;
        display: flex;
        flex-direction: column;
        transition: .382s;

        .cover {
            height: calc(100% - var(--itemTextHeight));
            background-color: #f0f0f0;
            border-radius: 16px;
            overflow: hidden;
            transition: .382s;

            img {
                border-radius: 16px;
                opacity: 0;
                width: 100%;
                height: 100%;
                transform: translateY(100%);
                object-position: center;
                object-fit: cover;
                transition: .8s cubic-bezier(.075, .82, .165, 1); //快速+柔和结束 
            }

        }

        label {
            height: var(--itemTextHeight);
            display: block;
            box-sizing: border-box;
            padding: 10px 0;
            /*多行省略号*/
            overflow: hidden;
            word-break: break-all;
            /*单词分割换行*/
            display: -webkit-box;
            -webkit-box-orient: vertical;
            max-height: min-content;
            -webkit-line-clamp: 2;

            line-height: 1.6;
            font-size: 14px;
        }

        &[imgLoaded] {

            .cover {
                background-color: transparent;

                img {
                    opacity: 1;
                    transform: translateY(0);
                }
            }

        }

    }
}
</style>

应用组件

<template>
    <div class="sg-body">
        <sgWaterfall :data="data" itemWidth="200" />
    </div>
</template>
    
<script>
import sgWaterfall from "@/vue/components/admin/sgWaterfall";
export default {
    components: { sgWaterfall },
    data: () => ({
        labels: [
            '在新的历史起点上继续推动文化繁荣',
            '江苏一飞机坠落 坠落地有飞机残骸',
            '河南暴雨 宾客坐积水中吃席',
            '多地细化举措护航暑期安全见闻',
            '男子炫耀钓到大鱼挂后备箱示众',
            '男子自称上山捡菌遇老虎 警方：行拘',
            '高温天妈妈将电扇让给孩子被热死',
            '狗狗被电动车踏板打了一路屁股',
            '重度自闭症男孩靠吹气球成网红',
            '男子疑在售水机打水时触电身亡',
            '广州平均月薪10883元',
            '邓伦再成被执行人',
            '9岁男孩被跳楼者砸中昏迷不醒',
            '女子买69平公寓公摊37平',
            '“银行高管”娶四个老婆获刑',
            '封神首映费翔黄渤河南话引爆笑',
            '张一山靠在关晓彤后背哭',
            '马丽的孩子确实叫沈腾舅舅',
            '鹿晗现身医院做康复治疗',
            '男子高空抛砖砸死人 称想跳楼但不敢',
            '一名中国侨胞在巴西遭枪击身亡',
            '山西杀害队长的环卫工已被捕',
            '猴子4小时去超市连偷3次',
            '韩安冉吐槽环球影城3小时花8000',
            '九旬老人逗鹦鹉得了鹦鹉热',
            '二十大以来首个正部级落马',
            '试管失败医院拒绝返还夫妻胚胎',
            '老人怕味大影响乘客高铁上干吃泡面',
            '重庆一消防员考上清华大学研究生',
            '猪场因断电死亡462头猪损失近百万',
            '消防喷水20分钟解救3000只中暑鸭',
        ],
        data: [],
    }),
    created() {
        this.data = this.createData();
    },

    methods: {
        createData(e) {
            return [...Array(50)].map((v, i) => {
                let width = Math.round(Math.random() * (1000 - 500) + 500);
                let height = Math.round(Math.random() * (1000 - 500) + 500);
                return {
                    label: this.labels[Math.round(Math.random() * (this.labels.length - 1))],
                    // imgURL: `static/files/picture/${(Math.random() * (50 - 1) + 1).toFixed(0)}.jpg`,
                    imgURL: `http://via.placeholder.com/${width}x${height}`,
                    width,
                    height,
                }
            }
            )
        },
    },
};
</script> 
<style lang="scss" scoped>
.sg-body {
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    overflow-y: auto;
}
</style>

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