Allow users to change how accounts are sorted when viewing a collection (#39073)

app/javascript/mastodon/components/form_fields/form_field_wrapper.module.scss

@@ -48,10 +48,14 @@
 
 .status {
   // If there's no content, we need to compensate for the parent's
-  // flex gap to avoid extra spacing below the field.
+  // flex gap to avoid extra spacing below or next to the field.
   &:empty {
     margin-top: calc(-1 * var(--form-field-label-gap));
   }
+
+  [data-input-placement^='inline'] &:empty {
+    margin-inline-start: calc(-1 * var(--form-field-label-gap));
+  }
 }
 
 .inputWrapper {

app/javascript/mastodon/components/form_fields/form_field_wrapper.tsx

@@ -24,7 +24,7 @@ export interface FieldStatus {
   message?: string;
 }
 
-interface FieldWrapperProps {
+export interface FieldWrapperProps {
   label: ReactNode;
   hint?: ReactNode;
   required?: boolean;

app/javascript/mastodon/components/form_fields/select_field.tsx

@@ -4,11 +4,17 @@ import { forwardRef } from 'react';
 import classNames from 'classnames';
 
 import { FormFieldWrapper } from './form_field_wrapper';
-import type { CommonFieldWrapperProps } from './form_field_wrapper';
+import type {
+  CommonFieldWrapperProps,
+  FieldWrapperProps,
+} from './form_field_wrapper';
 import classes from './select.module.scss';
 
 interface Props
-  extends ComponentPropsWithoutRef<'select'>, CommonFieldWrapperProps {}
+  extends
+    ComponentPropsWithoutRef<'select'>,
+    CommonFieldWrapperProps,
+    Pick<FieldWrapperProps, 'inputPlacement'> {}
 
 /**
  * A simple form field for single-item selections.
@@ -19,13 +25,28 @@ interface Props
  */
 
 export const SelectField = forwardRef<HTMLSelectElement, Props>(
-  ({ id, label, hint, required, status, children, ...otherProps }, ref) => (
+  (
+    {
+      id,
+      label,
+      hint,
+      required,
+      status,
+      inputPlacement,
+      children,
+      wrapperClassName,
+      ...otherProps
+    },
+    ref,
+  ) => (
     <FormFieldWrapper
       label={label}
       hint={hint}
       required={required}
       status={status}
       inputId={id}
+      inputPlacement={inputPlacement}
+      className={wrapperClassName}
     >
       {(inputProps) => (
         <Select {...otherProps} {...inputProps} ref={ref}>

app/javascript/mastodon/features/collections/detail/accounts_list.tsx

@@ -3,6 +3,8 @@ import { useCallback, useMemo, useRef } from 'react';
 import { defineMessages, FormattedMessage, useIntl } from 'react-intl';
 
 import { PendingBadge } from '@/mastodon/components/badge';
+import { SelectField } from '@/mastodon/components/form_fields';
+import { useSearchParam } from '@/mastodon/hooks/useSearchParam';
 import VisibilityOffIcon from '@/material-icons/400-24px/visibility_off.svg?react';
 import type {
   ApiCollectionJSON,
@@ -53,6 +55,43 @@ const getCollectionItems = createAppSelector(
     ),
 );
 
+function sortAccounts(
+  accounts: CollectionItemWithAccount[],
+  sortBy?: string,
+): CollectionItemWithAccount[] {
+  if (!sortBy || sortBy === 'date_added') {
+    return accounts;
+  }
+
+  const sorted = [...accounts];
+
+  switch (sortBy) {
+    case 'alphabetical':
+      return sorted.sort((a, b) => {
+        const nameA = a.account?.display_name ?? '';
+        const nameB = b.account?.display_name ?? '';
+        return nameA.localeCompare(nameB);
+      });
+
+    case 'last_active':
+      return sorted.sort((a, b) => {
+        const dateA = a.account?.last_status_at ?? '';
+        const dateB = b.account?.last_status_at ?? '';
+        return new Date(dateB).getTime() - new Date(dateA).getTime();
+      });
+
+    case 'most_followers':
+      return sorted.sort((a, b) => {
+        const followersA = a.account?.followers_count ?? 0;
+        const followersB = b.account?.followers_count ?? 0;
+        return followersB - followersA;
+      });
+
+    default:
+      return accounts;
+  }
+}
+
 export const CollectionAccountsList: React.FC<{
   collection: ApiCollectionJSON;
 }> = ({ collection }) => {
@@ -68,11 +107,20 @@ export const CollectionAccountsList: React.FC<{
     getCollectionItems(state, id),
   );
 
+  const [sortBy, setSortBy] = useSearchParam('sort', 'date_added');
+  const changeSortBy = useCallback(
+    (event: React.ChangeEvent<HTMLSelectElement>) => {
+      setSortBy(event.target.value);
+    },
+    [setSortBy],
+  );
+  const sortedAccounts = sortAccounts(collectionAccounts, sortBy);
+
   const { visibleAccounts, hiddenAccounts } = useMemo(() => {
     const visibleAccounts: CollectionItemWithAccount[] = [];
     const hiddenAccounts: CollectionItemWithAccount[] = [];
 
-    collectionAccounts.forEach((item) => {
+    sortedAccounts.forEach((item) => {
       const { account, account_id } = item;
 
       if (!isOwnCollection && !account) {
@@ -89,7 +137,7 @@ export const CollectionAccountsList: React.FC<{
     });
 
     return { visibleAccounts, hiddenAccounts };
-  }, [collectionAccounts, isOwnCollection, relationships]);
+  }, [sortedAccounts, isOwnCollection, relationships]);
 
   const renderAccountItemButton = useCallback(
     ({ relationship, accountId }: RenderButtonOptions) => {
@@ -147,17 +195,57 @@ export const CollectionAccountsList: React.FC<{
 
   return (
     <>
-      <h3
-        className={classes.columnSubheading}
-        tabIndex={-1}
-        ref={listHeadingRef}
-      >
-        <FormattedMessage
-          id='collections.account_count'
-          defaultMessage='{count, plural, one {# account} other {# accounts}}'
-          values={{ count: collection.item_count }}
-        />
-      </h3>
+      <div className={classes.subheadingWithSelect}>
+        <h3
+          className={classes.columnSubheading}
+          tabIndex={-1}
+          ref={listHeadingRef}
+        >
+          <FormattedMessage
+            id='collections.account_count'
+            defaultMessage='{count, plural, one {# account} other {# accounts}}'
+            values={{ count: collection.item_count }}
+          />
+        </h3>
+        <SelectField
+          label={
+            <FormattedMessage
+              id='collections.sort_by'
+              defaultMessage='Sort by:'
+            />
+          }
+          value={sortBy}
+          onChange={changeSortBy}
+          inputPlacement='inline-end'
+          className={classes.select}
+          wrapperClassName={classes.selectWrapper}
+        >
+          <option value='alphabetical'>
+            <FormattedMessage
+              id='collections.sort_alphabetical'
+              defaultMessage='Alphabetical'
+            />
+          </option>
+          <option value='last_active'>
+            <FormattedMessage
+              id='collections.sort_last_active'
+              defaultMessage='Last active'
+            />
+          </option>
+          <option value='most_followers'>
+            <FormattedMessage
+              id='collections.sort_most_followers'
+              defaultMessage='Most followers'
+            />
+          </option>
+          <option value='date_added'>
+            <FormattedMessage
+              id='collections.sort_date_added'
+              defaultMessage='Date added'
+            />
+          </option>
+        </SelectField>
+      </div>
       <ItemList emptyMessage={intl.formatMessage(messages.empty)}>
         <TruncatedListItems
           visibleItems={visibleAccounts}

app/javascript/mastodon/features/collections/detail/styles.module.scss

@@ -67,8 +67,27 @@
   margin-inline: 16px;
 }
 
-.columnSubheading {
+.subheadingWithSelect {
+  display: flex;
+  flex-wrap: wrap;
+  align-items: center;
+  gap: 8px 16px;
   padding-inline: 16px;
+}
+
+.selectWrapper {
+  // Align to right edge even when wrapped to new line
+  margin-inline-start: auto;
+}
+
+.select {
+  height: 36px;
+  border-radius: 8px;
+  font-size: 15px;
+  background-color: var(--color-bg-primary);
+}
+
+.columnSubheading {
   font-size: 15px;
   font-weight: 500;
 }

app/javascript/mastodon/locales/en.json

@@ -425,6 +425,11 @@
   "collections.search_accounts_max_reached": "You have added the maximum number of accounts",
   "collections.sensitive": "Sensitive",
   "collections.share_short": "Share",
+  "collections.sort_alphabetical": "Alphabetical",
+  "collections.sort_by": "Sort by:",
+  "collections.sort_date_added": "Date added",
+  "collections.sort_last_active": "Last active",
+  "collections.sort_most_followers": "Most followers",
   "collections.suggestions.can_not_add": "Can’t be added",
   "collections.suggestions.can_not_add_desc": "These accounts may have opted out of discovery, or they might be on a server that doesn’t support collections.",
   "collections.suggestions.must_follow": "Must follow first",