Finally a virtual scroll table

package-lock.json

@@ -12884,6 +12884,11 @@
       "integrity": "sha512-4gDntzrifFnCEvyoO8PqyJDmguXgVPxKiIxrBKjIowvL9l+N66196+72XVYR8BBf1Uv1Fgt3bGevJ+sEmxfZzw==",
       "dev": true
     },
+    "vue-virtual-scroll-list": {
+      "version": "2.2.9",
+      "resolved": "https://registry.npmjs.org/vue-virtual-scroll-list/-/vue-virtual-scroll-list-2.2.9.tgz",
+      "integrity": "sha512-dPlvzIUUtxkaVBVea2/73sWsiTrsIpjWXd+7FWJPUEL+ME1i6LuwWNiMMqu2WVad82ONWeoXSiM5NMSDpMxYGA=="
+    },
     "vue-virtual-scroller": {
       "version": "1.0.10",
       "resolved": "https://registry.npmjs.org/vue-virtual-scroller/-/vue-virtual-scroller-1.0.10.tgz",

package.json

@@ -41,6 +41,7 @@
     "spectre.css": "^0.5.8",
     "vue-click-outside": "^1.1.0",
     "vue-i18n": "^8.18.2",
+    "vue-virtual-scroll-list": "^2.2.9",
     "vue-virtual-scroller": "^1.0.10",
     "vuedraggable": "^2.23.2",
     "vuex": "^3.4.0",

src/renderer/components/BaseVirtualScroll.vue

@@ -0,0 +1,77 @@
+<template>
+   <div class="vscroll-holder">
+      <div
+         class="vscroll-spacer"
+         :style="{
+            opacity: 0,
+            clear: 'both',
+            height: topHeight + 'px'
+         }"
+      />
+      <slot :items="visibleItems" />
+      <div
+         class="vscroll-spacer"
+         :style="{
+            opacity: 0,
+            clear: 'both',
+            height: bottomHeight + 'px'
+         }"
+      />
+   </div>
+</template>
+
+<script>
+// credits: https://github.com/xrado 👼
+export default {
+   name: 'BaseVirtualScroll',
+   props: {
+      items: Array,
+      itemHeight: Number
+   },
+   data () {
+      return {
+         topHeight: 0,
+         bottomHeight: 0,
+         visibleItems: []
+      };
+   },
+   mounted () {
+      this._checkScrollPosition = this.checkScrollPosition.bind(this);
+      this.checkScrollPosition();
+      this.$el.addEventListener('scroll', this._checkScrollPosition);
+      this.$el.addEventListener('wheel', this._checkScrollPosition);
+   },
+   beforeDestroy () {
+      this.$el.removeEventListener('scroll', this._checkScrollPosition);
+      this.$el.removeEventListener('wheel', this._checkScrollPosition);
+   },
+   methods: {
+      checkScrollPosition (e = {}) {
+         var el = this.$el;
+
+         // prevent parent scroll
+         if ((el.scrollTop === 0 && e.deltaY < 0) || (Math.abs(el.scrollTop - (el.scrollHeight - el.clientHeight)) <= 1 && e.deltaY > 0))
+            e.preventDefault();
+
+         this.updateWindow(e);
+      },
+
+      updateWindow (e) {
+         const visibleItemsCount = Math.ceil(this.$el.clientHeight / this.itemHeight);
+         const totalScrollHeight = this.items.length * this.itemHeight;
+
+         const scrollTop = this.$el.scrollTop;
+         const offset = 5;
+         const firstVisibleIndex = Math.floor(scrollTop / this.itemHeight);
+         const lastVisibleIndex = firstVisibleIndex + visibleItemsCount;
+         const firstCutIndex = Math.max(firstVisibleIndex - offset, 0);
+         const lastCutIndex = lastVisibleIndex + offset;
+
+         this.visibleItems = this.items.slice(firstCutIndex, lastCutIndex);
+
+         this.topHeight = firstCutIndex * this.itemHeight;
+         this.bottomHeight = totalScrollHeight - this.visibleItems.length * this.itemHeight - this.topHeight;
+      }
+   }
+};
+</script>

src/renderer/components/WorkspaceQueryRow.vue

@@ -0,0 +1,43 @@
+<template>
+   <div>
+      <div
+         v-for="(col, cKey) in source"
+         :key="cKey"
+         class="td"
+         :class="fieldType(col)"
+      >
+         {{ col }}
+      </div>
+   </div>
+</template>
+
+<script>
+export default {
+   name: 'WorkspaceQueryRow',
+   props: {
+      index: { // index of current item
+         type: Number
+      },
+      source: { // here is: {uid: 'unique_1', text: 'abc'}
+         type: Object,
+         default () {
+            return {};
+         }
+      }
+   },
+   methods: {
+      fieldType (col) {
+         let type = typeof col;
+         if (type === 'object')
+            if (col instanceof Date) type = 'date';
+         if (col instanceof Uint8Array) type = 'blob';
+         if (col === null) type = 'null';
+
+         return `type-${type}`;
+      }
+   }
+};
+</script>
+
+<style>
+</style>

src/renderer/components/WorkspaceQueryTab.vue

@@ -22,7 +22,7 @@
             </div>
          </div>
       </div>
-      <div ref="resultTable" class="workspace-query-results column col-12">
+      <div class="workspace-query-results column col-12">
          <WorkspaceQueryTable v-if="results" :results="results" />
       </div>
    </div>
@@ -58,12 +58,6 @@ export default {
          return this.getWorkspace(this.connection.uid);
       }
    },
-   mounted () {
-      window.addEventListener('resize', this.resizeResults);
-   },
-   destroyed () {
-      window.removeEventListener('resize', this.resizeResults);
-   },
    methods: {
       ...mapActions({
          addNotification: 'notifications/addNotification'
@@ -72,7 +66,6 @@ export default {
          if (!this.query) return;
          this.isQuering = true;
          this.results = {};
-         this.resizeResults();
 
          const params = {
             uid: this.connection.uid,
@@ -92,24 +85,6 @@ export default {
          }
 
          this.isQuering = false;
-      },
-      resizeResults (e) {
-         const el = this.$refs.resultTable;
-         const footer = document.getElementById('footer');
-
-         if (el) {
-            const size = window.innerHeight - el.getBoundingClientRect().top - footer.offsetHeight;
-            el.style.height = size + 'px';
-         }
-      },
-      fieldType (col) {
-         let type = typeof col;
-         if (type === 'object')
-            if (col instanceof Date) type = 'date';
-         if (col instanceof Uint8Array) type = 'blob';
-         if (col === null) type = 'null';
-
-         return `type-${type}`;
       }
    }
 };

src/renderer/components/WorkspaceQueryTable.vue

@@ -1,5 +1,14 @@
 <template>
-   <div v-if="results" class="table table-hover">
+   <BaseVirtualScroll
+      v-if="results.rows"
+      ref="resultTable"
+      :items="results.rows"
+      :item-height="25"
+      class="vscroll"
+      :style="{'height': resultsSize+'px'}"
+   >
+      <template slot-scope="{ items }">
+         <div class="table table-hover">
             <div class="thead">
                <div class="tr">
                   <div
@@ -13,7 +22,7 @@
             </div>
             <div class="tbody">
                <div
-            v-for="(row, rKey) in results.rows"
+                  v-for="(row, rKey) in items"
                   :key="rKey"
                   class="tr"
                   tabindex="0"
@@ -29,14 +38,43 @@
                </div>
             </div>
          </div>
+      </template>
+   </BaseVirtualScroll>
 </template>
 
 <script>
+import BaseVirtualScroll from '@/components/BaseVirtualScroll';
+
 export default {
    name: 'WorkspaceQueryTable',
+   components: {
+      BaseVirtualScroll
+   },
    props: {
       results: Object
    },
+   data () {
+      return {
+         resultsSize: 1000
+      };
+   },
+   computed: {
+      rows () {
+         return this.results.rows ? this.results.rows.map(item => Object.assign({}, item)) : [];
+      }
+   },
+   watch: {
+      results: function () {
+         if (this.$refs.resultTable)
+            this.resizeResults();
+      }
+   },
+   mounted () {
+      window.addEventListener('resize', this.resizeResults);
+   },
+   destroyed () {
+      window.removeEventListener('resize', this.resizeResults);
+   },
    methods: {
       fieldType (col) {
          let type = typeof col;
@@ -46,11 +84,24 @@ export default {
          if (col === null) type = 'null';
 
          return `type-${type}`;
+      },
+      resizeResults (e) {
+         const el = this.$refs.resultTable.$el;
+         const footer = document.getElementById('footer');
+
+         if (el) {
+            const size = window.innerHeight - el.getBoundingClientRect().top - footer.offsetHeight;
+            this.resultsSize = size;
+         }
       }
    }
 };
 </script>
 
 <style>
-
+.vscroll {
+   height: 1000px;
+   overflow: auto;
+   overflow-anchor: none;
+}
 </style>

src/renderer/main.js

@@ -2,6 +2,7 @@
 
 import Vue from 'vue';
 
+import 'vue-virtual-scroller/dist/vue-virtual-scroller.css';
 import 'material-design-icons/iconfont/material-icons.css';
 import '@/scss/main.scss';