From 600d06a162b4489fd52d5809eb9f5a69f28618fc Mon Sep 17 00:00:00 2001
From: Bob Zeleznik <zzzman@gmail.com>
Date: Fri, 6 Dec 2019 23:11:51 -0500
Subject: performance tuning for sidebar

---
 .../views/collections/CollectionStackingView.tsx     | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)

(limited to 'src/client/views/collections/CollectionStackingView.tsx')

diff --git a/src/client/views/collections/CollectionStackingView.tsx b/src/client/views/collections/CollectionStackingView.tsx
index 9f01de08b..ff3417b77 100644
--- a/src/client/views/collections/CollectionStackingView.tsx
+++ b/src/client/views/collections/CollectionStackingView.tsx
@@ -24,6 +24,7 @@ import { ContextMenu } from "../ContextMenu";
 import { ContextMenuProps } from "../ContextMenuItem";
 import { ScriptBox } from "../ScriptBox";
 import { CollectionMasonryViewFieldRow } from "./CollectionMasonryViewFieldRow";
+import { TraceMobx } from "../../../new_fields/util";
 
 @observer
 export class CollectionStackingView extends CollectionSubView(doc => doc) {
@@ -383,17 +384,22 @@ export class CollectionStackingView extends CollectionSubView(doc => doc) {
         }
     }
 
+    @computed get renderedSections() {
+        TraceMobx();
+        let sections = [[undefined, this.filteredChildren] as [SchemaHeaderField | undefined, Doc[]]];
+        if (this.sectionFilter) {
+            const entries = Array.from(this.Sections.entries());
+            sections = entries.sort(this.sortFunc);
+        }
+        return sections.map(section => this.isStackingView ? this.sectionStacking(section[0], section[1]) : this.sectionMasonry(section[0], section[1]));
+    }
     render() {
+        TraceMobx();
         const editableViewProps = {
             GetValue: () => "",
             SetValue: this.addGroup,
             contents: "+ ADD A GROUP"
         };
-        let sections = [[undefined, this.filteredChildren] as [SchemaHeaderField | undefined, Doc[]]];
-        if (this.sectionFilter) {
-            const entries = Array.from(this.Sections.entries());
-            sections = entries.sort(this.sortFunc);
-        }
         return (
             <div className="collectionStackingMasonry-cont" >
                 <div className={this.isStackingView ? "collectionStackingView" : "collectionMasonryView"}
@@ -401,8 +407,8 @@ export class CollectionStackingView extends CollectionSubView(doc => doc) {
                     onScroll={action((e: React.UIEvent<HTMLDivElement>) => this._scroll = e.currentTarget.scrollTop)}
                     onDrop={this.onDrop.bind(this)}
                     onContextMenu={this.onContextMenu}
-                    onWheel={(e: React.WheelEvent) => e.stopPropagation()} >
-                    {sections.map(section => this.isStackingView ? this.sectionStacking(section[0], section[1]) : this.sectionMasonry(section[0], section[1]))}
+                    onWheel={e => e.stopPropagation()} >
+                    {this.renderedSections}
                     {!this.showAddAGroup ? (null) :
                         <div key={`${this.props.Document[Id]}-addGroup`} className="collectionStackingView-addGroupButton"
                             style={{ width: !this.isStackingView ? "100%" : this.columnWidth / this.numGroupColumns - 10, marginTop: 10 }}>
-- 
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