vite+elementPlus+vue3+jsplumb+pinia+sortable实现完整的流程图

实现完整的流程图需要以下步骤：

1. 安装依赖

npm install vite vue@next element-plus @vueuse/core jsplumb pinia sortablejs

2. 创建组件

在src/components目录下创建FlowChart.vue组件：

<template>
  <div class="flow-chart">
    <div class="chart-container">
      <div class="chart"></div>
    </div>
  </div>
</template>

<script>
import { defineComponent, ref, watchEffect } from 'vue'
import { useRoute } from 'vue-router'
import { useStore } from 'pinia'
import Sortable from 'sortablejs'
import jsPlumb from 'jsplumb'

import 'jsplumb/dist/js/jsplumb.min.css'

export default defineComponent({
  name: 'FlowChart',

  setup() {
    const store = useStore()
    const route = useRoute()
    const chartInstance = ref(null)

    watchEffect(() => {
      drawChart()
    })

    function drawChart() {
      const chart = document.querySelector('.chart')
      chart.innerHTML = ''

      const nodes = store.state.nodes.filter(
        (node) => node.page === route.name
      )

      const instance = jsPlumb.getInstance({
        Container: chart,
        Connector: ['Straight', { gap: 5 }],
        Endpoint: ['Dot', { radius: 4 }],
        EndpointStyle: { fill: 'transparent', stroke: '#555' },
        PaintStyle: { stroke: '#555', strokeWidth: 2 },
        DragOptions: { cursor: 'pointer', zIndex: 2000 },
        ConnectionOverlays: [
          [
            'Arrow',
            {
              location: 1,
              visible: true,
              width: 11,
              length: 11,
              id: 'ARROW',
            },
          ],
        ],
      })

      nodes.forEach((node) => {
        const el = document.createElement('div')
        el.classList.add('node')
        el.setAttribute('id', node.id)
        el.style.top = node.top + 'px'
        el.style.left = node.left + 'px'
        el.innerHTML = node.label
        chart.appendChild(el)

        instance.draggable(el, {
          stop: (event) => {
            const top = parseInt(event.el.style.top)
            const left = parseInt(event.el.style.left)
            store.updateNode(node.id, { top, left })
          },
        })
      })

      nodes.forEach((node) => {
        const connections = store.state.connections.filter(
          (conn) => conn.source === node.id
        )

        connections.forEach((conn) => {
          instance.connect({
            source: node.id,
            target: conn.target,
            overlays: [['Arrow', { location: 1, width: 11, length: 11 }]],
          })
        })
      })

      chartInstance.value = instance
    }

    return {
      chartInstance,
    }
  },
})
</script>

<style scoped>
.flow-chart {
  width: 100%;
  height: 100%;
}

.chart-container {
  position: relative;
  width: 100%;
  height: 100%;
  overflow: auto;
}

.chart {
  position: absolute;
  top: 0;
  left: 0;
  width: 10000px;
  height: 10000px;
}

.node {
  position: absolute;
  width: 100px;
  height: 40px;
  background-color: #fff;
  border: 1px solid #ccc;
  text-align: center;
  line-height: 40px;
  cursor: pointer;
}
</style>

3. 创建路由

在src/router/index.js中添加路由：

import { createRouter, createWebHistory } from 'vue-router'
import Home from '../views/Home.vue'
import FlowChart from '../components/FlowChart.vue'

const routes = [
  {
    path: '/',
    name: 'Home',
    component: Home,
  },
  {
    path: '/flow-chart',
    name: 'FlowChart',
    component: FlowChart,
  },
]

const router = createRouter({
  history: createWebHistory(process.env.BASE_URL),
  routes,
})

export default router

4. 创建状态管理

在src/store/index.js中创建状态管理：

import { defineStore } from 'pinia'

export const useFlowChartStore = defineStore('flow-chart', {
  state: () => ({
    nodes: [],
    connections: [],
  }),

  actions: {
    addNode(node) {
      node.id = Date.now().toString()
      node.top = 100
      node.left = 100
      this.nodes.push(node)
    },

    updateNode(nodeId, data) {
      const node = this.nodes.find((node) => node.id === nodeId)
      if (node) {
        Object.assign(node, data)
      }
    },

    addConnection(connection) {
      this.connections.push(connection)
    },

    removeNode(nodeId) {
      this.nodes = this.nodes.filter((node) => node.id !== nodeId)
      this.connections = this.connections.filter(
        (conn) => conn.source !== nodeId && conn.target !== nodeId
      )
    },

    removeConnection(connection) {
      this.connections = this.connections.filter(
        (conn) =>
          conn.source !== connection.source || conn.target !== connection.target
      )
    },
  },
})

5. 创建视图

在src/views/Home.vue中创建视图：

<template>
  <div class="home">
    <div class="sidebar">
      <form @submit.prevent="addNode">
        <label>
          Label:
          <input type="text" v-model="label" />
        </label>
        <button>Add Node</button>
      </form>
      <ul>
        <li v-for="node in nodes" :key="node.type">
          {{ node.label }}
          <button @click="removeNode(node.id)">Remove</button>
        </li>
      </ul>
    </div>
    <div class="main">
      <router-view />
    </div>
  </div>
</template>

<script>
import { defineComponent, ref } from 'vue'
import { useFlowChartStore } from '../store'

export default defineComponent({
  name: 'Home',

  setup() {
    const store = useFlowChartStore()
    const label = ref('')
    const nodes = ref([
      { type: 'start', label: 'Start' },
      { type: 'end', label: 'End' },
      { type: 'task', label: 'Task' },
      { type: 'decision', label: 'Decision' },
    ])

    function addNode() {
      store.addNode({ type: 'task', label: label.value })
      label.value = ''
    }

    function removeNode(nodeId) {
      store.removeNode(nodeId)
    }

    return {
      label,
      nodes,
      addNode,
      removeNode,
    }
  },
})
</script>

<style scoped>
.home {
  display: flex;
  flex-direction: row;
  height: 100%;
}

.sidebar {
  width: 200px;
  padding: 20px;
  background-color: #f5f5f5;
}

.main {
  flex: 1;
  height: 100%;
}
</style>

6. 运行应用

在package.json中添加运行命令：

{
  "scripts": {
    "dev": "vite"
  }
}

运行应用：

npm run dev

应用运行后，打开http://localhost:3000/，就可以看到一个空的流程图页面。在侧边栏添加节点，然后拖动节点到画布中，连接节点，就可以完成一个简单的流程图。