Vue3如何优雅的跨组件通信

**1、前期工作可以先看看大佬的文章 **https://blog.csdn.net/Try_your_best_l/article/details/120173192?spm=1001.2101.3001.6650.5&utm_medium=distribute.pc_relevant.none-task-blog-2_defaultCTRLIST_{Rate-5-120173192-blog-128109597.235%5Ev38%5Epc_relevant_default_base&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2}default_CTRLISTRate-5-120173192-blog-128109597.235%5Ev38%5Epc_relevant_default_base&utm_relevant_index=10

2、安装完 vue-tree-color 和 less less-loader 后启动项目，报错，两种情况，一种是less 版本问题（less 使用 3.9.0） 和 autoprefixer 版本问题（使用 7.1.6）

3、进入开发，主要是样式问题了（先看看最终效果）

4、并不是单纯的展示数据而已，还要操作，自定义样式，按钮权限等

// index.vue
<template>
  <div v-loading="loading" class="culture_box" :style="{ transform: scale }" @mousewheel="handleMouseWheel">
    <vue2-org-tree v-if="isShow" :data="treeData" :render-content="renderContent" :props="props" collapsable @on-expand="onExpand" />
    <el-dialog :title="popTitle" append-to-body :visible.sync="addPop" width="30%" :close-on-click-modal="false" @close="closeDialog">
      <el-form ref="editForm" label-width="120px" :model="editForm" :rules="rules">
        <el-form-item label="部（所）名称" prop="deptName" class="add_form_item">
          <el-input v-model="editForm.deptName" :maxlength="10" auto-complete="off" :disabled="type == 3" placeholder="请输入部（所）名称" />
        </el-form-item>
        <el-form-item label="文化路径展示" class="add_form_item">
          <el-upload
            v-if="type === 1 || type === 2"
            ref="uploadImg"
            class="avatar-uploader"
            :show-file-list="false"
            action="/tk/api/icomx-resource/oss/endpoint/put-file-attach"
            :on-success="handleAvatarSuccess"
            :before-upload="beforeAvatarUpload"
          >
            <img v-if="editForm.photographs !== ''" style="width: 100px;" :src="editForm.photographs" alt="">
            <i v-else class="el-icon-plus upload_plus" />
          </el-upload>
          <el-image v-else style="width: 100px;" :src="editForm.photographs" alt="" :preview-src-list="[editForm.photographs]" />
          <div v-if="(type === 2 || type === 1) && editForm.photographs != ''" class="btn_img">
            <el-button @click="delImg">删除</el-button>
            <el-button @click="changeImg">更换</el-button>
          </div>
        </el-form-item>
        <el-form-item label="部（所）简介" class="add_form_item">
          <el-input v-model="editForm.deptDescribe" type="textarea" auto-complete="off" :disabled="type == 3" placeholder="请输入部（所）简介" />
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="closeDialog">{{ type === 3? '关闭': '取消' }}</el-button>
        <el-button v-if="type === 1 || type === 2" type="primary" class="title" :loading="saveLoading" @click="handleSave">保存</el-button>
      </div>
    </el-dialog>
    <el-dialog :visible.sync="dialogVisible">
      <img width="100%" :src="dialogImageUrl" alt="">
    </el-dialog>
  </div>
</template>
<script>
import { getTreeData, getTreeAdd, getTreeEdit, getTreeDel } from '@/api/culture/index.js'
export default {
  data() {
    return {
      treeData: {},
      props: {
        label: 'deptName',
        children: 'children',
        expand: 'expand'
      },
      isShow: false,
      imgUrl: '',
      dialogVisible: false,
      dialogImageUrl: '',
      type: 1, // 新增修改详情参数
      addPop: false,
      editForm: {
        deptName: '',
        photographs: '',
        deptDescribe: ''
      },
      saveLoading: false,
      rules: {
        deptName: [
          { required: true, message: '请输入部（所）名称', trigger: 'blur' }
        ]
      },
      scaleRatio: 1,
      loading: false,
      popTitle: ''
    }
  },
  computed: {
    scale() {
      return `scale(${this.scaleRatio})`
    }
  },
  created() {
    this.init()
  },
  methods: {
    // 初始化数据
    async init() {
      this.loading = true
      let res = await getTreeData()
      this.loading = false
      if (res.data.code === 200) {
        this.treeData = res.data.data[0]
        this.toggleExpand(this.treeData, true)
        this.isShow = true
      }
    },
    // 自定义事件
    handleEdit(data, type) {
      this.type = type
      this.addPop = true
      this.editForm = { ...data }
      this.popTitle = this.type === 1 ? data.deptName + '新增' : this.type === 2 ? data.deptName + '编辑' : data.deptName + '详情'
      // 新增清空项
      if (type === 1) {
        this.editForm.deptName = ''
        this.editForm.photographs = ''
        this.editForm.deptDescribe = ''
      }
    },
    // 删除某节点
    handleDel(data) {
      this.$confirm('确认是否删除该部（所）?', '温馨提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(async() => {
        return getTreeDel(data.id).then(() => {
          this.init()
          this.$message({
            type: 'success',
            message: '操作成功!'
          })
        })
      }).catch(() => {
      })
    },
    // 渲染节点
    renderContent(h, data) {
      return h('div', { class: 'tree_box' }, [
        h('div', { class: 'tree_title' }, [
          h('span', {}, data.deptName)
        ]),
        h('div', { class: 'tree_content' }, [
          h('div', { class: 'culture_show' }, [
            h('span', '文化路径展示'),
            h('el-image', {
              attrs: {
                src: data.photographs,
                alt: '',
                class: 'img_box'
              },
              props: {
                'preview-src-list': [data.photographs] // 添加preview-src-list属性
              }
            })
          ]),
          h('div', { class: 'des_box' }, [
            h('span', '部（所）简介'),
            h('el-input', {
              attrs: {
                type: 'textarea',
                disabled: true
              },
              props: {
                'value': [data.deptDescribe]
              }
            })
          ])
        ]),
        h('div', { class: 'tree_btn' }, [
          h('i', {
            class: 'el-icon-edit',
            on: {
              click: () => this.handleEdit(data, 2)
            }}
          ),
          h('span', {
            on: {
              click: () => this.handleEdit(data, 3)
            }
          }, '详情'),
          h('span', {
            on: {
              click: () => this.handleEdit(data, 1)
            }
          }, '新增下级')
        ]),
        h('div', { class: 'del_btn' }, [
          h('i', {
            class: 'el-icon-close',
            style: {
              display: data.parentId === '0' ? 'none' : 'inline-block'
            },
            on: {
              click: () => this.handleDel(data)
            }}
          )
        ])
      ])
    },
    // 默认展开还是收起 -- 第一个参数是data，第二个参数是全部展开或否
    toggleExpand(data, val) {
      if (Array.isArray(data)) {
        data.forEach(item => {
          this.$set(item, 'expand', val)
          if (item.children) {
            this.toggleExpand(item.children, val)
          }
        })
      } else {
        this.$set(data, 'expand', val)
        if (data.children) {
          this.toggleExpand(data.children, val)
        }
      }
    },
    collapse(list) {
      list.forEach(child => {
        if (child.expand) {
          child.expand = false
        }
        child.children && this.collapse(child.children)
      })
    },
    // 收起展开
    onExpand(e, data) {
      if ('expand' in data) {
        data.expand = !data.expand
        if (!data.expand && data.children) {
          this.collapse(data.children)
        }
      } else {
        this.$set(data, 'expand', true)
      }
    },
    // 弹窗保存
    async handleSave() {
      this.$refs.editForm.validate(async(valid) => {
        if (valid) {
          this.saveLoading = true
          // 判断新增或是修改
          let res
          if (this.type === 1) {
            this.editForm.parentId = this.editForm.id
            delete this.editForm.id
            res = await getTreeAdd(this.editForm)
          }
          if (this.type === 2) {
            res = await getTreeEdit(this.editForm)
          }
          this.saveLoading = false
          if (res.data.code === 200) {
            this.$nextTick(() => {
              this.$refs.editForm.resetFields()
            })
            this.$message.success(this.type === 1 ? '新增成功！' : '修改成功！')
            this.addPop = false
            this.init()
          } else {
            this.$message.error(res.data.msg)
          }
        } else {
          return false
        }
      })
    },
    // 弹窗关闭
    closeDialog() {
      this.$nextTick(() => {
        this.$refs.editForm.resetFields()
      })
      this.addPop = false
    },
    // 上传成功
    handleAvatarSuccess(res, file) {
      // console.log(res, file)
      if (res.code === 200) {
        // this.editForm.photographs = URL.createObjectURL(file.raw)
        this.editForm.photographs = res.data.link
      }
      this.$refs.uploadImg.clearFiles()
    },
    // 上传前
    beforeAvatarUpload(file) {
      // const isJPG = file.type === 'image/jpeg'
      // const isLt2M = file.size / 1024 / 1024 < 2
      // if (!isJPG) {
      //   this.$message.error('上传头像图片只能是 JPG 格式!')
      // }
      // if (!isLt2M) {
      //   this.$message.error('上传头像图片大小不能超过 2MB!')
      // }
      // return isJPG && isLt2M
    },
    // 弹窗文化路径展示删除
    delImg() {
      this.editForm.photographs = ''
    },
    // 更换
    changeImg() {
      // 触发上传
      this.$nextTick(() => {
        this.$refs.uploadImg.$children[0].$refs.input.click()
      })
    },
    // 鼠标滚动事件(wheelDelta值上滚为负下滚为正)
    handleMouseWheel(e) {
      // 同时按下shift键
      if (e.wheelDelta > 0 && e.shiftKey === true) {
        this.decreaseScale()
      }
      if (e.wheelDelta < 0 && e.shiftKey === true) {
        this.increaseScale()
      }
    },
    // 放大
    increaseScale() {
      this.scaleRatio += 0.1
    },
    // 缩小
    decreaseScale() {
      if (this.scaleRatio > 0.2) {
        this.scaleRatio -= 0.1
      }
    }
  }
}
</script>
<style lang="less">
@import './tree';
</style>

6、重点代码是渲染节点的方法，如果加按钮权限，则是下面的代码

import { mapGetters } from 'vuex'
computed: {
  ...mapGetters(['permission']),
  scale() {
    return `scale(${this.scaleRatio})`
  },
  // 按钮权限
  permissionList() {
    return {
      addBtn: this.vaildData(this.permission.businessCulture_add, false),
      viewBtn: this.vaildData(this.permission.businessCulture_view, false),
      delBtn: this.vaildData(this.permission.businessCulture_remove, false),
      editBtn: this.vaildData(this.permission.businessCulture_edit, false)
    }
  }
},
methods:{
	// 渲染节点
    renderContent(h, data) {
      const btnElements = []
      const delElements = []
      // 根据权限显隐
      if (this.permissionList.editBtn) {
        btnElements.push(
          h('i', {
            class: 'el-icon-edit',
            on: {
              click: () => this.handleEdit(data, 2)
            }
          })
        )
      }
      if (this.permissionList.viewBtn) {
        btnElements.push(
          h('span', {
            on: {
              click: () => this.handleEdit(data, 3)
            }
          }, '详情')
        )
      }
      if (this.permissionList.addBtn) {
        btnElements.push(
          h('span', {
            on: {
              click: () => this.handleEdit(data, 1)
            }
          }, '新增下级')
        )
      }
      if (this.permissionList.delBtn) {
        delElements.push(
          h('i', {
            class: 'el-icon-close',
            style: {
              display: data.parentId === '0' ? 'none' : 'inline-block'
            },
            on: {
              click: () => this.handleDel(data)
            }}
          )
        )
      }
      return h('div', { class: 'tree_box' }, [
        h('div', { class: 'tree_title' }, [
          h('span', {}, data.deptName)
        ]),
        h('div', { class: 'tree_content' }, [
          h('div', { class: 'culture_show' }, [
            h('span', '文化路径展示'),
            h('el-image', {
              attrs: {
                src: data.photographs,
                alt: '',
                class: 'img_box'
              },
              props: {
                'preview-src-list': [data.photographs] // 添加preview-src-list属性
              }
            })
          ]),
          h('div', { class: 'des_box' }, [
            h('span', '部（所）简介'),
            h('el-input', {
              attrs: {
                type: 'textarea',
                disabled: true
              },
              props: {
                'value': [data.deptDescribe]
              }
            })
          ])
        ]),
        h('div', { class: 'tree_btn' }, btnElements),
        h('div', { class: 'del_btn' }, delElements)
      ])
    }
}

7、less 代码也贴贴

// tree.less
.culture_box {
  // width: calc(100vw - 240px);
  height: calc(100vh - 122px);
  overflow-x: auto;
  overflow-y: auto;
}
.tree_box {
  width: 100%;
  font-size: 14px;
  display: flex;
  flex-direction: column;
  .tree_title {
    width: 100%;
    font-weight: 600;
    margin-bottom: 10px;
    span {
      width: 100%;
      overflow: hidden;
      text-overflow: ellipsis;
      white-space: nowrap;
    }
  }
  .tree_content {
    .culture_show {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      margin-bottom: 10px;
      .el-image {
        width: 170px;
        height: 50px;
        margin-top: 4px;
      }
    }
    .des_box {
      display: flex;
      flex-direction: column;
      align-items: flex-start;
      margin-bottom: 10px;
      .el-textarea {
        font-size: 14px;
        margin-top: 4px;
        background: #f2f2f2;
      }
    }
  }
  .tree_btn {
    display: flex;
    justify-content: space-around;
    align-items: center;
    .el-icon-edit {
      cursor: pointer;
    }
    span {
      cursor: pointer;
      text-decoration: underline;
    }
  }
  .del_btn {
    position: absolute;
    top: 2px;
    right: 4px;
    font-size: 16px;
    cursor: pointer;
  }
  .avatar {
    width: 100px;
  }
  .upload_plus {
    font-size: 30px;
  }
}
.org-tree-node-label {
  width: 200px;
}

磕磕碰碰才是人生哈