<!--
 * User: CHT
 * Date: 2020/6/28
 * Time: 17:48
-->
<template>
  <div>
    <div class="super-flow-demo1">
      <div class="node-container">
        <span
          class="node-item"
          v-for="(item, index) in nodeItemList"
          :key="index"
          @mousedown="evt => nodeItemMouseDown(evt, item.value)"
          @click="clickItem">
          {{item.label}}
        </span>
      </div>
      <div
        class="flow-container"
        ref="flowContainer">
        <super-flow
          ref="superFlow"
          :graph-menu="graphMenu"
          :node-menu="nodeMenu"
          :link-menu="linkMenu"
          :link-base-style="linkBaseStyle"
          :link-style="linkStyle"
          :link-desc="linkDesc">
          <template v-slot:node="{meta}">
            <div
              class="flow-node">
              {{meta.name}}
            </div>
          </template>
        </super-flow>
      </div>
    </div>

    <el-dialog
      :title="drawerConf.title"
      :visible.sync="drawerConf.visible"
      :close-on-click-modal="false"
      width="500px">
      <el-form
        v-show="drawerConf.type === drawerType.node"
        ref="nodeSetting"
        :model="nodeSetting">
        <el-form-item
          label="节点名称"
          prop="name">
          <el-input
            v-model="nodeSetting.name"
            placeholder="请输入节点名称"
            maxlength="30">
          </el-input>
        </el-form-item>
        <el-form-item
          label="节点描述"
          prop="desc">
          <el-input
            v-model="nodeSetting.desc"
            placeholder="请输入节点描述"
            maxlength="30">
          </el-input>
        </el-form-item>
      </el-form>
      <el-form
        v-show="drawerConf.type === drawerType.link"
        ref="linkSetting"
        :model="linkSetting">
        <el-form-item
          label="连线描述"
          prop="desc">
          <el-input
            v-model="linkSetting.desc"
            placeholder="请输入连线描述">
          </el-input>
        </el-form-item>
      </el-form>
      <span
        slot="footer"
        class="dialog-footer">
        <el-button
          @click="drawerConf.cancel">
          取 消
        </el-button>
        <el-button
          type="primary"
          @click="settingSubmit">
          确 定
        </el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
  const drawerType = {
    node: 0,
    link: 1
  }
  export default {
    data() {
      return {
        drawerType,
        drawerConf: {
          title: '',
          visible: false,
          type: null,
          info: null,
          open: (type, info) => {
            const conf = this.drawerConf
            conf.visible = true
            conf.type = type
            conf.info = info
            if (conf.type === drawerType.node) {
              conf.title = '节点'
              if (this.$refs.nodeSetting) this.$refs.nodeSetting.resetFields()
              this.$set(this.nodeSetting, 'name', info.meta.name)
              this.$set(this.nodeSetting, 'desc', info.meta.desc)
            } else {
              conf.title = '连线'
              if (this.$refs.linkSetting) this.$refs.linkSetting.resetFields()
              this.$set(this.linkSetting, 'desc', info.meta ? info.meta.desc : '')
            }
          },
          cancel: () => {
            this.drawerConf.visible = false
            if (this.drawerConf.type === drawerType.node) {
              this.$refs.nodeSetting.clearValidate()
            } else {
              this.$refs.linkSetting.clearValidate()
            }
          }
        },
        linkSetting: {
          desc: ''
        },
        nodeSetting: {
          name: '',
          desc: ''
        },
        dragConf: {
          isDown: false,
          isMove: false,
          offsetTop: 0,
          offsetLeft: 0,
          clientX: 0,
          clientY: 0,
          ele: null,
          info: null
        },
        nodeItemList: [
          {
            label: '节点1',
            value: {
              width: 120,
              height: 40,
              meta: {
                label: '1',
                name: '1'
              }
            }
          },
          {
            label: '节点2',
            value: {
              width: 120,
              height: 40,
              meta: {
                label: '2',
                name: '2'
              }
            }
          },
          {
            label: '节点3',
            value: {
              width: 120,
              height: 40,
              meta: {
                label: '3',
                name: '3'
              }
            }
          },
          {
            label: '节点4',
            value: {
              width: 120,
              height: 40,
              meta: {
                label: '4',
                name: '4'
              }
            }
          }
        ],
        graphMenu: [
          [
            {
              // 选项 label
              label: '节点1',
              // 选项是否禁用
              disable(graph) {
                return !!graph.nodeList.find(node => node.meta.label === '1')
              },
              // 选项选中后回调函数
              selected(graph, coordinate) {
                graph.addNode({
                  width: 120,
                  height: 40,
                  coordinate,
                  meta: {
                    label: '1',
                    name: '1'
                  }
                })
              }
            },
            {
              label: '节点2',
              selected(graph, coordinate) {
                graph.addNode({
                  width: 120,
                  height: 40,
                  coordinate,
                  meta: {
                    label: '2',
                    name: '2'
                  }
                })
              }
            },
            {
              label: '节点3',
              selected(graph, coordinate) {
                graph.addNode({
                  width: 120,
                  height: 40,
                  coordinate,
                  meta: {
                    label: '3',
                    name: '3'
                  }
                })
              }
            }
          ],
          [
            {
              label: '节点4',
              selected(graph, coordinate) {
                graph.addNode({
                  width: 120,
                  height: 40,
                  coordinate,
                  meta: {
                    label: '4',
                    name: '4'
                  }
                })
              }
            }
          ],
          [
            {
              label: '全选',
              selected: graph => {
                graph.selectAll()
              }
            }
          ]
        ],
        nodeMenu: [
          [
            {
              label: '删除',
              selected: node => {
                node.remove()
              }
            },
            {
              label: '编辑',
              selected: node => {
                this.drawerConf.open(drawerType.node, node)
              }
            }
          ]
        ],
        linkMenu: [
          [
            {
              label: '删除',
              selected: link => {
                link.remove()
              }
            },
            {
              label: '编辑',
              selected: link => {
                this.drawerConf.open(drawerType.link, link)
              }
            }
          ]
        ],
        linkBaseStyle: {
          color: '#666666',           // line 颜色
          hover: '#FF0000',           // line hover 的颜色
          textColor: '#666666',       // line 描述文字颜色
          textHover: '#FF0000',       // line 描述文字 hover 颜色
          font: '14px Arial',         // line 描述文字 字体设置 参考 canvas font
          dotted: false,              // 是否是虚线
          lineDash: [4, 4],           // 虚线时生效
          background: 'rgba(255,255,255,0.6)'    // 描述文字背景色
        },
        fontList: [
          '14px Arial',
          'italic small-caps bold 12px arial'
        ]
      }
    },
    mounted() {
      document.addEventListener('mousemove', this.docMousemove)
      document.addEventListener('mouseup', this.docMouseup)
      this.$once('hook:beforeDestroy', () => {
        document.removeEventListener('mousemove', this.docMousemove)
        document.removeEventListener('mouseup', this.docMouseup)
      })
    },
    methods: {
      flowNodeClick(meta) {
        console.log(this.$refs.superFlow.graph)
      },
      linkStyle(link) {
        return {
          // hover: '#FF00FF'
        }
      },
      linkDesc(link) {
        return link.meta ? link.meta.desc : ''
      },
      settingSubmit() {
        const conf = this.drawerConf
        if (this.drawerConf.type === drawerType.node) {
          if (!conf.info.meta) conf.info.meta = {}
          Object.keys(this.nodeSetting).forEach(key => {
            this.$set(conf.info.meta, key, this.nodeSetting[key])
          })
          this.$refs.nodeSetting.resetFields()
        } else {
          if (!conf.info.meta) conf.info.meta = {}
          Object.keys(this.linkSetting).forEach(key => {
            this.$set(conf.info.meta, key, this.linkSetting[key])
          })
          this.$refs.linkSetting.resetFields()
        }
        conf.visible = false
      },
      docMousemove({clientX, clientY}) {
        const conf = this.dragConf
        if (conf.isMove) {
          conf.ele.style.top = clientY - conf.offsetTop + 'px'
          conf.ele.style.left = clientX - conf.offsetLeft + 'px'
        } else if (conf.isDown) {
          // 鼠标移动量大于 5 时 移动状态生效
          conf.isMove =
            Math.abs(clientX - conf.clientX) > 5
            || Math.abs(clientY - conf.clientY) > 5
        }
      },
      docMouseup({clientX, clientY}) {
        const conf = this.dragConf
        conf.isDown = false
        if (conf.isMove) {
          const {
            top,
            right,
            bottom,
            left
          } = this.$refs.flowContainer.getBoundingClientRect()
          // 判断鼠标是否进入 flow container
          if (
            clientX > left
            && clientX < right
            && clientY > top
            && clientY < bottom
          ) {
            // 获取拖动元素左上角相对 super flow 区域原点坐标
            const coordinate = this.$refs.superFlow.getMouseCoordinate(
              clientX - conf.offsetLeft,
              clientY - conf.offsetTop
            )
            // 添加节点
            this.$refs.superFlow.addNode({
              coordinate,
              ...conf.info
            })
          }
          conf.isMove = false
        }
        if (conf.ele) {
          conf.ele.remove()
          conf.ele = null
        }
      },
      nodeItemMouseDown(evt, info) {
        const {
          clientX,
          clientY,
          currentTarget
        } = evt
        const {
          top,
          left
        } = evt.currentTarget.getBoundingClientRect()
        const conf = this.dragConf
        const ele = currentTarget.cloneNode(true)
        Object.assign(this.dragConf, {
          offsetLeft: clientX - left,
          offsetTop: clientY - top,
          clientX: clientX,
          clientY: clientY,
          info,
          ele,
          isDown: true
        })
        ele.id = Math.random()
        ele.style.position = 'fixed'
        ele.style.margin = '0'
        ele.style.top = clientY - conf.offsetTop + 'px'
        ele.style.left = clientX - conf.offsetLeft + 'px'
        this.$el.appendChild(this.dragConf.ele)
      },
      clickItem(item) {
        console.log(item)
      }
    }
  }
</script>

<style lang="less">
  .link-base-style-form {
    .el-form-item {
      margin-bottom : 12px;
    }
    padding-bottom : 20px;
    border-bottom  : 1px solid #DCDCDC;
  }
  .super-flow-demo1 {
    margin-top       : 20px ;
    width            : 100%;
    height           : 800px;
    background-color : #f5f5f5;
    @list-width      : 200px;
    > .node-container {
      width            : @list-width;
      float            : left;
      height           : 100%;
      text-align       : center;
      background-color : #FFFFFF;
    }
    > .flow-container {
      width    : calc(100% - @list-width);
      float    : left;
      height   : 100%;
      overflow : hidden;
    }
    .super-flow__node {
      .flow-node {
        width       : 100%;
        height      : 100%;
        line-height : 40px;
        padding     : 0 6px;
        font-size   : 12px;
      }
    }
  }
  .node-item {
    @node-item-height : 30px;
    font-size         : 14px;
    display           : inline-block;
    height            : @node-item-height;
    width             : 120px;
    margin-top        : 20px;
    background-color  : #FFFFFF;
    line-height       : @node-item-height;
    box-shadow        : 1px 1px 4px rgba(0, 0, 0, 0.3);
    cursor            : pointer;
    user-select       : none;
    text-align        : center;
    z-index           : 6;
    &:hover {
      box-shadow : 1px 1px 8px rgba(0, 0, 0, 0.4);
    }
  }
</style>