/**
 * JS获取html代码中所有的图片地址
 * @param htmlstr
 * @returns arr 数组
 */

export function getimgsrc(htmlstr) {
    let reg = /<img.+?src=('|")?([^'"]+)('|")?(?:\s+|>)/g;
    let arr = [];
    let tem = 0;
    //eslint-disable-next-line
    while ((tem = reg.exec(htmlstr))) {
        arr.push(tem[2]); // eslint-disable-line
    }

    return arr;
}

<template>
    <div class="image-expansion" :class="classArr">
        <div @click.stop="hanldeImage($event)" v-html="formatHtmlData"></div>

        <el-image-viewer
            v-if="imgPreviewUrl"
            :initial-index="subscript"
            :src="imgPreviewUrl"
            :on-close="closeViewer"
            :url-list="imgList"
        ></el-image-viewer>
    </div>
</template>

<script>
import { getimgsrc } from '../../utils/getimgsrc';
import ElImageViewer from 'element-ui/packages/image/src/image-viewer';
export default {
    components: {
        ElImageViewer
    },
    props: {
        htmlData: {
            type: String,
            default: () => {
                return '';
            }
        },
        classArr: {
            type: Array,
            default: () => {
                return ['min'];
            }
        },

        isArticle: {
            type: Boolean,
            default: () => {
                return false;
            }
        }
    },
    data() {
        return {
            imgList: [],
            formatHtmlData: '',
            imgPreviewUrl: '',
            subscript: 0
        };
    },
    computed: {},

    watch: {
        //监听数据，防止数据不更新
        htmlData: {
            handler(newName, oldName) {
                //判断是否为文章
                if (this.isArticle) {
                    newName ? (this.formatHtmlData = newName.replace(/(<([^>]+)>)/gi, '').replace(/[\r\n]/g, '')) : '';
                } else {
                    //剔除strong和p标签
                    newName ? (this.formatHtmlData = newName.replace(/(<\/?strong.*?>)|(<\/?p.*?>)/g, '')) : '';

                    //获取html全部图片，push成图片数组
                    this.imgList = Object.values(getimgsrc(this.formatHtmlData));
                    //获取图片下标
                    let subscript = this.imgList.indexOf(this.imgPreviewUrl);
                    this.subscript = subscript > -1 ? subscript : 0;
                }
            },

            immediate: true
        }
    },

    mounted() {},

    methods: {
        //监听点击事件
        hanldeImage(event) {
            if (event.target.nodeName === 'IMG' || event.target.nodeName === 'img') {
                //获取点击的图片url,decodeURIComponent转码一下，防禁url转码
                this.imgPreviewUrl = decodeURIComponent(event.target.currentSrc);

                //获取图片下标
                let subscript = this.imgList.indexOf(this.imgPreviewUrl);
                this.subscript = subscript > -1 ? subscript : 0;

                //禁止遮罩层后面的内容滚动
                document.documentElement.style.overflowY = 'hidden';
            } else {
                this.$emit('goDetail');
            }
        },

        //关闭弹框
        closeViewer() {
            this.imgPreviewUrl = '';
            //恢复遮罩层后面的内容滚动
            document.documentElement.style.overflowY = 'auto';
        }
    }
};
</script>

<style lang="scss" scoped>
.image-expansion {
}

.min {
    /deep/ img {
        cursor: pointer;
        height: 28px;
        padding: 0 10px 3px;
    }
}

.max {
    /deep/ img {
        cursor: pointer;
    }
}

.class1 {
    /deep/ div {
        font-size: 15px;
        font-family: Microsoft YaHei;
        font-weight: 400;
        color: #888888;
        line-height: 30px;
    }
}
</style>