From e365d3d3cda1065533dd2fe264eb92bf11e9a066 Mon Sep 17 00:00:00 2001
From: fit2cloud-chenyw <yawen.chen@fit2cloud.com>
Date: Thu, 23 Jun 2022 16:52:32 +0800
Subject: [PATCH] =?UTF-8?q?perf:=20=E4=BC=98=E5=8C=96=E4=B8=8B=E6=8B=89?=
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---
 .../src/components/ElVisualSelect/index.vue   | 166 ++++++++++++++++++
 .../components/widget/DeWidget/DeSelect.vue   |  28 ++-
 .../serviceImpl/TextSelectServiceImpl.js      |   4 +-
 .../panel/filter/filterMain/FilterControl.vue |  12 +-
 4 files changed, 200 insertions(+), 10 deletions(-)
 create mode 100644 frontend/src/components/ElVisualSelect/index.vue

diff --git a/frontend/src/components/ElVisualSelect/index.vue b/frontend/src/components/ElVisualSelect/index.vue
new file mode 100644
index 0000000000..5338d70b59
--- /dev/null
+++ b/frontend/src/components/ElVisualSelect/index.vue
@@ -0,0 +1,166 @@
+<template>
+  <el-select
+    ref="visualSelect"
+    v-model="selectValue"
+    :class="classId"
+    popper-class="VisualSelects"
+    v-bind="$attrs"
+    v-on="$listeners"
+    @visible-change="popChange"
+  >
+    <el-option v-for="item in options" :key="item.id" :label="item.text" :value="item.id" />
+  </el-select>
+</template>
+
+<script>
+import { uuid } from 'vue-uuid'
+export default {
+  name: 'ElVisualSelect',
+  model: {
+    prop: 'value', // 绑定的值，通过父组件传递
+    event: 'update' // 自定义名
+  },
+  props: {
+    classId: {
+      type: String,
+      require: true,
+      default: uuid.v1()
+    },
+    list: {
+      type: Array,
+      default: () => {
+        return []
+      }
+    },
+    value: {
+      type: [String, Number, Array],
+      default: ''
+    }
+  },
+  data() {
+    return {
+      newList: [],
+      selectValue: this.value,
+      options: [],
+      domList: null,
+      slectBoxDom: null,
+      scrollbar: null,
+      startIndex: 0,
+      endIndex: 0,
+      maxLength: 9, // 弹出框最大支持9个条目
+      itemHeight: 34, // select组件选项高度
+      maxHeightDom: null,
+      defaultFirst: false
+    }
+  },
+  watch: {
+    selectValue(val) {
+      this.$emit('update', val)
+      if (!val) {
+        this.resetList()
+        this.maxHeightDom.style.height = this.newList.length * 34 + 'px'
+        this.domList.style.paddingTop = 0 + 'px'
+      }
+    },
+    list() {
+      this.resetList()
+      this.init()
+    }
+  },
+  mounted() {
+    this.resetList()
+    this.init()
+  },
+  methods: {
+    addScrollDiv(selectDom) {
+      this.maxHeightDom = document.createElement('div')
+      this.maxHeightDom.className = 'el-select-height'
+      selectDom.insertBefore(this.maxHeightDom, this.domList)
+    },
+    reCacularHeight() {
+      this.maxHeightDom.style.height = this.newList.length * this.itemHeight + 'px'
+    },
+    resetList(arrys) {
+      if (Array.isArray(arrys)) {
+        this.newList = arrys.slice()
+        this.domList.style.paddingTop = 0 + 'px'
+        this.scrollbar.scrollTop = 0
+        this.callback()
+      } else {
+        this.newList = this.list.slice()
+      }
+      this.options = this.newList.slice(0, this.maxLength)
+    },
+
+    init() {
+      if (this.defaultFirst && this.list.length > 0) {
+        this.selectValue = this.list[0].value
+      }
+
+      const selectDom = document.querySelector(
+        `.${this.classId} .el-select-dropdown .el-select-dropdown__wrap`
+      )
+      this.scrollbar = document.querySelector(`.${this.classId} .el-select-dropdown .el-scrollbar`)
+      this.slectBoxDom = document.querySelector(`.${this.classId} .el-select-dropdown__wrap`)
+      this.slectBoxDom.style.display = 'flex'
+      this.slectBoxDom.style.flexDirection = 'row'
+      this.domList = selectDom.querySelector(
+        `.${this.classId} .el-select-dropdown__wrap .el-select-dropdown__list`
+      )
+      this.addScrollDiv(this.slectBoxDom)
+
+      this.scrollFn()
+    },
+
+    scrollFn() {
+      this.scrollbar.addEventListener('scroll', this.callback, false)
+    },
+
+    callback() {
+      const scrollTop = this.scrollbar.scrollTop
+      this.startIndex = parseInt(scrollTop / this.itemHeight)
+      this.endIndex = this.startIndex + this.maxLength
+
+      this.options = this.newList.slice(this.startIndex, this.endIndex)
+      this.domList.style.paddingTop = scrollTop - (scrollTop % this.itemHeight) + 'px'
+    },
+    popChange() {
+      this.domList.style.paddingTop = 0 + 'px'
+
+      this.resetList()
+      this.reCacularHeight()
+    }
+  }
+
+}
+</script>
+
+<style lang="scss">
+.VisualSelects {
+  .el-scrollbar {
+    position: relative;
+    height: 251px;
+    overflow: inherit;
+    overflow-x: hidden;
+    content-visibility: auto;
+  }
+  ::-webkit-scrollbar {
+    background: #ffffff !important;
+  }
+  .el-select-height {
+    width: 1px;
+    position: absolute;
+    top: 0;
+    left: 0;
+  }
+  .el-select-dropdown__list {
+    width: 100%;
+    position: absolute;
+    top: 0;
+    left: 0;
+  }
+  .el-select-dropdown__wrap {
+    height: 0;
+  }
+}
+</style>
diff --git a/frontend/src/components/widget/DeWidget/DeSelect.vue b/frontend/src/components/widget/DeWidget/DeSelect.vue
index 749ad44920..7d0940ff29 100644
--- a/frontend/src/components/widget/DeWidget/DeSelect.vue
+++ b/frontend/src/components/widget/DeWidget/DeSelect.vue
@@ -1,9 +1,10 @@
 <template>
-
-  <el-select
-    v-if="element.options!== null && element.options.attrs!==null && show"
+  <component
+    :is="mode"
+    v-if="element.options!== null && element.options.attrs!==null && show "
     ref="deSelect"
     v-model="value"
+    :class-id="'visual-' + element.id + '-' + inDraw + '-' + inScreen"
     :collapse-tags="showNumber"
     :clearable="!element.options.attrs.multiple"
     :multiple="element.options.attrs.multiple"
@@ -13,12 +14,13 @@
     :filterable="true"
     class="de-select-tag"
     popper-class="coustom-de-select"
+    :list="datas"
     @change="changeValue"
     @focus="setOptionWidth"
     @blur="onBlur"
   >
     <el-option
-      v-for="item in datas"
+      v-for="item in templateDatas || datas"
       :key="item[element.options.attrs.key]"
       :style="{width:selectOptionWidth}"
       :label="item[element.options.attrs.label]"
@@ -26,17 +28,19 @@
     >
       <span :title="item[element.options.attrs.label]" style="display:inline-block;width:100%;white-space:nowrap;text-overflow:ellipsis;overflow:hidden;">{{ item[element.options.attrs.label] }}</span>
     </el-option>
-  </el-select>
+  </component>
 
 </template>
 
 <script>
+import ElVisualSelect from '@/components/ElVisualSelect'
 import { multFieldValues, linkMultFieldValues } from '@/api/dataset/dataset'
 import bus from '@/utils/bus'
 import { getLinkToken, getToken } from '@/utils/auth'
 import customInput from '@/components/widget/DeWidget/customInput'
 
 export default {
+  components: { ElVisualSelect },
   mixins: [customInput],
   props: {
     element: {
@@ -65,6 +69,16 @@ export default {
     }
   },
   computed: {
+    mode() {
+      let result = 'el-select'
+      if (this.element.options && this.element.options.attrs && this.element.options.attrs.visual) {
+        result = 'el-visual-select'
+      }
+      return result
+    },
+    templateDatas() {
+      return this.mode === 'el-visual-select' ? [] : null
+    },
     operator() {
       return this.element.options.attrs.multiple ? 'in' : 'eq'
     },
@@ -298,7 +312,7 @@ export default {
       background-color: var(--BgSelectColor, #f4f4f5) !important;
       border-color: var(--BrSelectColor, #e9e9eb) !important;
       color: var(--SelectColor, #909399) !important;
-  
+
       i {
         color: var(--SelectColor, #909399) !important;
       }
@@ -308,4 +322,4 @@ export default {
     }
   }
 }
-</style>
\ No newline at end of file
+</style>
diff --git a/frontend/src/components/widget/serviceImpl/TextSelectServiceImpl.js b/frontend/src/components/widget/serviceImpl/TextSelectServiceImpl.js
index 056f56a5c9..c1bd366db9 100644
--- a/frontend/src/components/widget/serviceImpl/TextSelectServiceImpl.js
+++ b/frontend/src/components/widget/serviceImpl/TextSelectServiceImpl.js
@@ -19,7 +19,8 @@ const dialogPanel = {
       value: 'id',
       fieldId: '',
       dragItems: [],
-      sort: {}
+      sort: {},
+      visual: false
     },
     value: '',
     manualModify: false
@@ -52,6 +53,7 @@ class TextSelectServiceImpl extends WidgetService {
     super(options)
     this.filterDialog = true
     this.showSwitch = true
+    this.showVisual = true
   }
 
   initLeftPanel() {
diff --git a/frontend/src/views/panel/filter/filterMain/FilterControl.vue b/frontend/src/views/panel/filter/filterMain/FilterControl.vue
index 1cdd27034d..992ad91756 100644
--- a/frontend/src/views/panel/filter/filterMain/FilterControl.vue
+++ b/frontend/src/views/panel/filter/filterMain/FilterControl.vue
@@ -9,8 +9,13 @@
           :inactive-text="$t('panel.single_choice')"
           @change="multipleChange"
         />
+
+        <span v-if="widget.showVisual" style="padding-left: 20px;">
+          <el-checkbox v-model="attrs.visual" @change="showVisualChange">虚拟化</el-checkbox>
+        </span>
       </div>
     </el-col>
+
     <el-col :span="16">
       <div class="filter-options-right">
         <span style="padding-right: 10px;">
@@ -64,7 +69,7 @@
           <el-checkbox v-model="attrs.enableParameters" @change="enableParametersChange"><span>
             {{ $t('panel.binding_parameters') }} </span> </el-checkbox>
 
-          <el-popover  placement="bottom-end" :disabled="!attrs.enableParameters" width="200">
+          <el-popover placement="bottom-end" :disabled="!attrs.enableParameters" width="200">
             <div class="view-container-class">
               <el-checkbox-group v-model="attrs.parameters">
                 <el-checkbox
@@ -99,7 +104,7 @@
 </template>
 
 <script>
-import {mapState} from "vuex";
+import { mapState } from 'vuex'
 
 export default {
   name: 'FilterControl',
@@ -163,6 +168,9 @@ export default {
       }
       this.fillAttrs2Filter()
     },
+    showVisualChange(value) {
+      this.fillAttrs2Filter()
+    },
 
     fillAttrs2Filter() {}
   }