Improve planex group search performance

src/components/Lists/PlanexGroups/GroupListAccordion.tsx

@@ -20,7 +20,6 @@
 import * as React from 'react';
 import { List, withTheme } from 'react-native-paper';
 import { FlatList, StyleSheet, View } from 'react-native';
-import { stringMatchQuery } from '../../../utils/Search';
 import GroupListItem from './GroupListItem';
 import AnimatedAccordion from '../../Animations/AnimatedAccordion';
 import type {
@@ -40,6 +39,9 @@ type PropsType = {
 
 const LIST_ITEM_HEIGHT = 64;
 const REPLACE_REGEX = /_/g;
+// The minimum number of characters to type before expanding the accordion
+// This prevents expanding too many items at once
+const MIN_SEARCH_SIZE_EXPAND = 2;
 
 const styles = StyleSheet.create({
   container: {
@@ -76,18 +78,6 @@ class GroupListAccordion extends React.Component<PropsType> {
     );
   };
 
-  getData(): Array<PlanexGroupType> {
-    const { props } = this;
-    const originalData = props.item.content;
-    const displayData: Array<PlanexGroupType> = [];
-    originalData.forEach((data: PlanexGroupType) => {
-      if (stringMatchQuery(data.name, props.currentSearchString)) {
-        displayData.push(data);
-      }
-    });
-    return displayData;
-  }
-
   itemLayout = (
     _data: Array<PlanexGroupType> | null | undefined,
     index: number
@@ -129,13 +119,13 @@ class GroupListAccordion extends React.Component<PropsType> {
           }
           unmountWhenCollapsed={!isFavorite} // Only render list if expanded for increased performance
           opened={
-            props.currentSearchString.length > 0 ||
+            props.currentSearchString.length >= MIN_SEARCH_SIZE_EXPAND ||
             (isFavorite && !isEmptyFavorite)
           }
           enabled={!isEmptyFavorite}
         >
           <FlatList
-            data={this.getData()}
+            data={props.item.content}
             extraData={props.currentSearchString + props.favorites.length}
             renderItem={this.getRenderItem}
             keyExtractor={this.keyExtractor}

src/screens/Planex/GroupSelectionScreen.tsx

@@ -93,12 +93,7 @@ function GroupSelectionScreen() {
    * @param item The article to render
    * @return {*}
    */
-  const getRenderItem = ({ item }: { item: PlanexGroupCategoryType }) => {
+  const getRenderItem = ({ item }: { item: PlanexGroupCategoryType }) => (
-    if (
-      shouldDisplayAccordion(item) ||
-      (item.id === 0 && item.content.length === 0)
-    ) {
-      return (
     <GroupListAccordion
       item={item}
       favorites={[...favoriteGroups]}
@@ -107,9 +102,6 @@ function GroupSelectionScreen() {
       currentSearchString={currentSearchString}
     />
   );
-    }
-    return null;
-  };
 
   /**
    * Creates the dataset to be used in the FlatList
@@ -184,23 +176,6 @@ function GroupSelectionScreen() {
     }
   };
 
-  /**
-   * Checks whether to display the given group category, depending on user search query
-   *
-   * @param item The group category
-   * @returns {boolean}
-   */
-  const shouldDisplayAccordion = (item: PlanexGroupCategoryType): boolean => {
-    let shouldDisplay = false;
-    for (let i = 0; i < item.content.length; i += 1) {
-      if (stringMatchQuery(item.content[i].name, currentSearchString)) {
-        shouldDisplay = true;
-        break;
-      }
-    }
-    return shouldDisplay;
-  };
-
   /**
    * Generates the dataset to be used in the FlatList.
    * This improves formatting of group names, sorts alphabetically the categories, and adds favorites at the top.
@@ -212,13 +187,30 @@ function GroupSelectionScreen() {
     fetchedData: PlanexGroupsType | undefined
   ): Array<PlanexGroupCategoryType> => {
     const data: Array<PlanexGroupCategoryType> = [];
+
     if (fetchedData) {
+      // Convert the object into an array
       Object.values(fetchedData).forEach(
         (category: PlanexGroupCategoryType) => {
-          data.push(category);
+          const content: Array<PlanexGroupType> = [];
+          // Filter groups matching the search query
+          category.content.forEach((g: PlanexGroupType) => {
+            if (stringMatchQuery(g.name, currentSearchString)) {
+              content.push(g);
+            }
+          });
+          // Only add categories with groups matching the query
+          if (content.length > 0) {
+            data.push({
+              id: category.id,
+              name: category.name,
+              content: content,
+            });
+          }
         }
       );
       data.sort(sortName);
+      // Add the favorites at the top
       data.unshift({
         name: i18n.t('screens.planex.favorites.title'),
         id: 0,