使用 vue-crooper进行图片截取

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📝 专 栏：vue实践
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<!--/**
 * @author: liuk
 * @date: 2023/2/7
 * @describe: 图片截取
*/-->
<template>
  <div class="user-info-head">
    <el-dialog :title="title" v-model="open" width="800px" append-to-body @opened="modalOpened" @close="closeDialog">
      <el-row>
        <el-col :xs="24" :md="12" :style="{ height: '350px' }">
          <vueCropper
              ref="cropper"
              :img="options.img"
              :info="true"
              :autoCrop="options.autoCrop"
              :autoCropWidth="options.autoCropWidth"
              :autoCropHeight="options.autoCropHeight"
              :fixedBox="options.fixedBox"
              :outputType="options.outputType"
              @realTime="realTime"
              v-if="visible"
          />
        </el-col>
        <el-col :xs="22" :md="12" :style="{ height: '350px' }">
          <div class="avatar-upload-preview">
            <img :src="options.previews.url" :style="options.previews.img"/>
          </div>
        </el-col>
      </el-row>
      <br/>
      <el-row>
        <el-col :lg="2" :md="2">
          <el-upload
              action="#"
              :http-request="requestUpload"
              :show-file-list="false"
              :before-upload="beforeUpload"
          >
            <el-button>选择
              <el-icon class="el-icon--right">
                <Upload/>
              </el-icon>
            </el-button>
          </el-upload>
        </el-col>
        <el-col :lg="{ span: 1, offset: 2 }" :md="2">
          <el-button icon="Plus" @click="changeScale(1)"></el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :md="2">
          <el-button icon="Minus" @click="changeScale(-1)"></el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :md="2">
          <el-button icon="RefreshLeft" @click="rotateLeft()"></el-button>
        </el-col>
        <el-col :lg="{ span: 1, offset: 1 }" :md="2">
          <el-button icon="RefreshRight" @click="rotateRight()"></el-button>
        </el-col>
        <el-col :lg="{ span: 2, offset: 6 }" :md="2">
          <el-button type="primary" @click="uploadImg()">提 交</el-button>
        </el-col>
      </el-row>
    </el-dialog>
  </div>
</template>

<script setup lang="ts">
import {ref, getCurrentInstance, reactive, defineExpose} from "vue"
import "./vue-cropper/index.css";
import VueCropper from "./vue-cropper/vue-cropper.vue";
// import {uploadFileApi} from "@/api/files"
import {useUserStore} from "@/stores/user";

const user = useUserStore()
const {proxy} = getCurrentInstance() as any;

const open = ref(false);
const visible = ref(false);
const title = ref("图片截取");

// @Emits
const emit = defineEmits<{
  (e: "submit", data: string): void
}>()


//图片裁剪数据
const options = reactive({
  img: user.state.avatarUrl, // 裁剪图片的地址
  autoCrop: true, // 是否默认生成截图框
  autoCropWidth: 200, // 默认生成截图框宽度
  autoCropHeight: 200, // 默认生成截图框高度
  fixedBox: true, // 固定截图框大小 不允许改变
  outputType: "png", // 默认生成截图为PNG格式
  previews: {} //预览数据
});

/** 打开弹出层结束时的回调 */
function modalOpened() {
  visible.value = true;
}

/** 向左旋转 */
function rotateLeft() {
  proxy.$refs.cropper.rotateLeft();
}

/** 向右旋转 */
function rotateRight() {
  proxy.$refs.cropper.rotateRight();
}

/** 图片缩放 */
function changeScale(num: number) {
  num = num || 1;
  proxy.$refs.cropper.changeScale(num);
}

/** 上传预处理 */
function beforeUpload(file: any) {
  if (file.type.indexOf("image/") == -1) {
    proxy.$modal.msgError("文件格式错误，请上传图片类型,如：JPG，PNG后缀的文件。");
  } else {
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.onload = () => {
      options.img = reader.result;
    };
  }
}

/** 上传图片 */
function uploadImg() {
  proxy.$refs.cropper.getCropBlob((data: any) => {
    console.log(data, 11111);// Bolb 流文件
    // uploadFileApi(data).then((response: any) => {
    //   options.img = response.imgUrl;
    //   user.avatar = options.img;
    //   visible.value = false;
    //   emit("submit", response.data.url)
    // });
  });
}


/** 实时预览 */
function realTime(data: any) {
  options.previews = data;
}

/** 关闭窗口 */
function closeDialog() {
  options.img = user.state.avatarUrl;
  (options as any).visible = false;
}

defineExpose({open})
</script>

<style scoped lang="scss">
.user-info-head {
  position: relative;
  display: inline-block;
  height: 120px;

  &:hover:after {
    content: '+';
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    bottom: 0;
    color: #eee;
    background: rgba(0, 0, 0, 0.5);
    font-size: 24px;
    font-style: normal;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    cursor: pointer;
    line-height: 110px;
    border-radius: 50%;
  }

}

.avatar-upload-preview {
  width: 200px;
  height: 200px;
  margin: 70px auto;
  overflow: hidden;
  border: 1px solid #e7e6e6;
}
</style>