<template>
    <div class="singleImageUpload2 upload-container">
        <el-upload
                class="image-uploader"
                :data="dataObj"
                drag
                :multiple="false"
                :show-file-list="false"
                action="https://httpbin.org/post"

                :on-success="handleImageScucess">
            <i class="el-icon-upload"></i>
            <div class="el-upload__text">Drag或<em>点击上传</em></div>
        </el-upload>
        <div v-show="imageUrl.length>0" class="image-preview">
            <div class="image-preview-wrapper" v-show="imageUrl.length>1">
                <img :src="imageUrl">
                <div class="image-preview-action">
                    <i @click="rmImage" class="el-icon-delete"></i>
                </div>
            </div>
        </div>
    </div>
</template>
<script>
    // 预览效果见专题
    import { getToken } from 'api/qiniu';
    export default {
      name: 'singleImageUpload2',
      props: {
        value: String
      },
      computed: {
        imageUrl() {
          return this.value
        }
      },
      data() {
        return {
          tempUrl: '',
          dataObj: { token: '', key: '' }
        };
      },
      methods: {
        rmImage() {
          this.emitInput('');
        },
        emitInput(val) {
          this.$emit('input', val);
        },
        handleImageScucess() {
          this.emitInput(this.tempUrl)
        },
        beforeUpload() {
          const _self = this;
          return new Promise((resolve, reject) => {
            getToken().then(response => {
              const key = response.data.qiniu_key;
              const token = response.data.qiniu_token;
              _self._data.dataObj.token = token;
              _self._data.dataObj.key = key;
              this.tempUrl = response.data.qiniu_url;
              resolve(true);
            }).catch(err => {
              console.log(err);
              reject(false)
            });
          });
        }
      }
    };
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
    .upload-container {
        width: 100%;
        height: 100%;
        position: relative;
        .image-uploader{
            height: 100%;
        }
        .image-preview {
            width: 100%;
            height: 100%;
            position: absolute;
            left: 0px;
            top: 0px;
            border: 1px dashed #d9d9d9;
            .image-preview-wrapper {
                position: relative;
                width: 100%;
                height: 100%;
                img {
                    width: 100%;
                    height: 100%;
                }
            }
            .image-preview-action {
                position: absolute;
                width: 100%;
                height: 100%;
                left: 0;
                top: 0;
                cursor: default;
                text-align: center;
                color: #fff;
                opacity: 0;
                font-size: 20px;
                background-color: rgba(0, 0, 0, .5);
                transition: opacity .3s;
                cursor: pointer;
                text-align: center;
                line-height: 200px;
                .el-icon-delete {
                    font-size: 36px;
                }
            }
            &:hover {
                .image-preview-action {
                    opacity: 1;
                }
            }
        }
    }

</style>