# Custom rendering

# Node rendering

<template>
  <div class="container">
    <input
      class="scale-handler"
      type="range"
      :min="0.1"
      :max="2"
      :step="0.01"
      v-model="scaleRatio"
    />
    <vis-tree
      class="vis-tree"
      ref="visTree"
      :data-source="dataSource"
      :scale-ratio="scaleRatio"
      :options="options"
    >
      <template v-slot:node="nodeSlotProps">
        <div class="node-container">
          <div class="node-content">
            {{nodeSlotProps.node.key}}
          </div>

          <i
            v-if="nodeSlotProps.node.children && nodeSlotProps.node.children.length > 0"
            class="node-switcher"
            :class="nodeSlotProps.expanded ? 'el-icon-circle-plus-outline' : 'el-icon-remove-outline'"
            :style="{ color: `${nodeSlotProps.expanded ? 'green' : 'red'}` }"
            @click="() => toggleNodeExpanded(nodeSlotProps.node.key)"
          />
        </div>
      </template>
    </vis-tree>
  </div>
</template>

<script>
import VisTree from '@vis-tree/vue';
import 'element-plus/lib/theme-chalk/index.css';

const originDataSource = {
  key: 'O',
  children: [
    {
      key: 'E',
      children: [
        {
          key: 'A',
        },
        {
          key: 'D',
          children: [
            {
              key: 'B',
            },
            {
              key: 'C',
            },
          ],
        },
      ],
    },
    {
      key: 'F',
    },
    {
      key: 'N',
      children: [
        {
          key: 'G',
        },
        {
          key: 'M',
          children: [
            {
              key: 'H',
            },
            {
              key: 'I',
            },
            {
              key: 'J',
            },
            {
              key: 'K',
            },
            {
              key: 'L',
            },
          ],
        },
      ],
    },
  ],
};

export default {
  props: {
    msg: String,
  },
  components: {
    VisTree,
  },
  data() {
    return {
      scaleRatio: 1,
      dataSource: originDataSource,
      options: {
          defaultScrollInfo: {
            key: originDataSource.key,
            top: 40,
          },
          defaultExpandAll: true,
      }
    };
  },
  methods: {
    toggleNodeExpanded(key) {
      this.$refs.visTree.toggleNodeExpanded(key);
    },
  }
};
</script>

<style scoped>
.container {
  position: relative;
  background-color: #fff;
  border: 1px solid #ebedf1;
  border-radius: 1px;
}
.scale-handler {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 1;
}
.vis-tree {
  width: 100%;
  height: 400px;
}
.node-container {
  height: 100%;
  box-sizing: border-box;
  background: #fff;
  border: 1px solid black;
}
.node-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.node-switcher {
  width: 14px;
  height: 14px;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translate(-50%, -50%);
  cursor: pointer;
  background: #fff;
}
</style>

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The rendering of the node is achieved by <template v-slot:node="nodeSlotProps"></template>，nodeSlotProps is an object，which has the following properties:

node: Current node
expanded: true means the node is in the expanded state, false means the node is in the collapsed state. If the node has no children, then it must be false
parentNode: The parent node of the current node. For the root node, this attribute is undefined

The DOM structure is as follows:

<template>
  <!-- Its width and height are determined by options.nodeWidth and options.nodeHeight respectively -->
  <div class="tree-node-wrapper">
    <div class="tree-node-content">
      <slot name="node"></slot>
    </div>
  </div>
</template>

<style>
.tree-node-wrapper {
  position: absolute;
  cursor: auto;
}

.tree-node-content {
  position: absolute;
  width: 100%;
  height: 100%;
  top: 0;
  left: 0;
  z-index: 1;
}
</style>

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# Rendering of connecting lines

<template>
  <div class="container">
    <input
      class="scale-handler"
      type="range"
      :min="0.1"
      :max="2"
      :step="0.01"
      v-model="scaleRatio"
    />
    <vis-tree
      class="vis-tree"
      ref="visTree"
      :data-source="dataSource"
      :scale-ratio="scaleRatio"
      :options="options"
    >
      <template v-slot:node="nodeSlotProps">
        <div class="node-container">
          <div class="node-content">
            {{ nodeSlotProps.node.key }}
          </div>

          <i
            v-if="
              nodeSlotProps.node.children &&
              nodeSlotProps.node.children.length > 0
            "
            class="node-switcher"
            :class="
              nodeSlotProps.expanded
                ? 'el-icon-circle-plus-outline'
                : 'el-icon-remove-outline'
            "
            :style="{ color: `${nodeSlotProps.expanded ? 'green' : 'red'}` }"
            @click="() => toggleNodeExpanded(nodeSlotProps.node.key)"
          />
        </div>
      </template>

      <template v-slot:line="lineSlotProps">
        <div
          v-if="lineSlotProps.containerWidth === 0"
          :style="{
            width: '1px',
            height: `${lineSlotProps.containerHeight}px`,
            background: 'black',
          }"
        />

        <div
          v-if="lineSlotProps.containerHeight === 0"
          :style="{
            width: `${lineSlotProps.containerWidth}px`,
            height: '1px',
            background: 'black',
          }"
        />

        <svg
          v-if="lineSlotProps.containerWidth && lineSlotProps.containerHeight"
          :width="`${lineSlotProps.containerWidth}px`"
          :height="`${lineSlotProps.containerHeight}px`"
        >
          <path
            :d="`M ${lineSlotProps.startPointCoordinate[0]} ${lineSlotProps.startPointCoordinate[1]}, L ${lineSlotProps.stopPointCoordinate[0]} ${lineSlotProps.stopPointCoordinate[1]}`"
            strokeWidth="1px"
            fill="none"
            stroke="black"
          />
        </svg>
      </template>
    </vis-tree>
  </div>
</template>

<script>
import VisTree from "@vis-tree/vue";
import "element-plus/lib/theme-chalk/index.css";

const originDataSource = {
  key: "O",
  children: [
    {
      key: "E",
      children: [
        {
          key: "A",
        },
        {
          key: "D",
          children: [
            {
              key: "B",
            },
            {
              key: "C",
            },
          ],
        },
      ],
    },
    {
      key: "F",
    },
    {
      key: "N",
      children: [
        {
          key: "G",
        },
        {
          key: "M",
          children: [
            {
              key: "H",
            },
            {
              key: "I",
            },
            {
              key: "J",
            },
            {
              key: "K",
            },
            {
              key: "L",
            },
          ],
        },
      ],
    },
  ],
};

export default {
  props: {
    msg: String,
  },
  components: {
    VisTree,
  },
  data() {
    return {
      scaleRatio: 1,
      dataSource: originDataSource,
      options: {
        defaultScrollInfo: {
          key: originDataSource.key,
          top: 40,
        },
        defaultExpandAll: true,
          lineType: "none",
      },
    };
  },
  methods: {
    toggleNodeExpanded(key) {
      this.$refs.visTree.toggleNodeExpanded(key);
    },
  },
};
</script>

<style scoped>
.container {
  position: relative;
  background-color: #fff;
  border: 1px solid #ebedf1;
  border-radius: 1px;
}
.scale-handler {
  position: absolute;
  top: 20px;
  right: 20px;
  z-index: 1;
}
.vis-tree {
  width: 100%;
  height: 400px;
}
.node-container {
  height: 100%;
  box-sizing: border-box;
  background: #fff;
  border: 1px solid black;
}
.node-content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.node-switcher {
  width: 14px;
  height: 14px;
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translate(-50%, -50%);
  cursor: pointer;
  background: #fff;
}
</style>

The rendering of the line is achieved by <template v-slot:line="lineSlotProps"></template> ，lineSlotProps is an object，which has the following properties:

startNode: Start node of the connecting line
stopNode: End node of the connecting line
containerWidth: The width of the rectangle with the connecting line as the diagonal
containerHeight: The height of the rectangle with the connecting line as the diagonal
startPointCoordinate: In the coordinate system formed by the rectangle with the connecting line as the diagonal, the coordinates of the starting point
stopPointCoordinate: In the coordinate system formed by the rectangle with the connecting line as the diagonal, the coordinates of the end point

The DOM structure is as follows:

<template>
  <!-- Its width and height are containerWidth and containerHeight respectively -->
  <div class="tree-custom-line">
    <slot name="line"></slot>
  </div>
</template>

<style>
.tree-custom-line {
  position: absolute;
}
</style>

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