Add pagination for trending statuses in web UI (#17976)

app/javascript/mastodon/actions/trends.js

@@ -1,4 +1,4 @@
-import api from '../api';
+import api, { getLinks } from '../api';
 import { importFetchedStatuses } from './importer';
 
 export const TRENDS_TAGS_FETCH_REQUEST = 'TRENDS_TAGS_FETCH_REQUEST';
@@ -13,6 +13,10 @@ export const TRENDS_STATUSES_FETCH_REQUEST = 'TRENDS_STATUSES_FETCH_REQUEST';
 export const TRENDS_STATUSES_FETCH_SUCCESS = 'TRENDS_STATUSES_FETCH_SUCCESS';
 export const TRENDS_STATUSES_FETCH_FAIL    = 'TRENDS_STATUSES_FETCH_FAIL';
 
+export const TRENDS_STATUSES_EXPAND_REQUEST = 'TRENDS_STATUSES_EXPAND_REQUEST';
+export const TRENDS_STATUSES_EXPAND_SUCCESS = 'TRENDS_STATUSES_EXPAND_SUCCESS';
+export const TRENDS_STATUSES_EXPAND_FAIL    = 'TRENDS_STATUSES_EXPAND_FAIL';
+
 export const fetchTrendingHashtags = () => (dispatch, getState) => {
   dispatch(fetchTrendingHashtagsRequest());
 
@@ -68,11 +72,16 @@ export const fetchTrendingLinksFail = error => ({
 });
 
 export const fetchTrendingStatuses = () => (dispatch, getState) => {
+  if (getState().getIn(['status_lists', 'trending', 'isLoading'])) {
+    return;
+  }
+
   dispatch(fetchTrendingStatusesRequest());
 
-  api(getState).get('/api/v1/trends/statuses').then(({ data }) => {
-    dispatch(importFetchedStatuses(data));
-    dispatch(fetchTrendingStatusesSuccess(data));
+  api(getState).get('/api/v1/trends/statuses').then(response => {
+    const next = getLinks(response).refs.find(link => link.rel === 'next');
+    dispatch(importFetchedStatuses(response.data));
+    dispatch(fetchTrendingStatusesSuccess(response.data, next ? next.uri : null));
   }).catch(err => dispatch(fetchTrendingStatusesFail(err)));
 };
 
@@ -81,9 +90,10 @@ export const fetchTrendingStatusesRequest = () => ({
   skipLoading: true,
 });
 
-export const fetchTrendingStatusesSuccess = statuses => ({
+export const fetchTrendingStatusesSuccess = (statuses, next) => ({
   type: TRENDS_STATUSES_FETCH_SUCCESS,
   statuses,
+  next,
   skipLoading: true,
 });
 
@@ -93,3 +103,37 @@ export const fetchTrendingStatusesFail = error => ({
   skipLoading: true,
   skipAlert: true,
 });
+
+
+export const expandTrendingStatuses = () => (dispatch, getState) => {
+  const url = getState().getIn(['status_lists', 'trending', 'next'], null);
+
+  if (url === null || getState().getIn(['status_lists', 'trending', 'isLoading'])) {
+    return;
+  }
+
+  dispatch(expandTrendingStatusesRequest());
+
+  api(getState).get(url).then(response => {
+    const next = getLinks(response).refs.find(link => link.rel === 'next');
+    dispatch(importFetchedStatuses(response.data));
+    dispatch(expandTrendingStatusesSuccess(response.data, next ? next.uri : null));
+  }).catch(error => {
+    dispatch(expandTrendingStatusesFail(error));
+  });
+};
+
+export const expandTrendingStatusesRequest = () => ({
+  type: TRENDS_STATUSES_EXPAND_REQUEST,
+});
+
+export const expandTrendingStatusesSuccess = (statuses, next) => ({
+  type: TRENDS_STATUSES_EXPAND_SUCCESS,
+  statuses,
+  next,
+});
+
+export const expandTrendingStatusesFail = error => ({
+  type: TRENDS_STATUSES_EXPAND_FAIL,
+  error,
+});

app/javascript/mastodon/features/explore/statuses.js

@@ -4,11 +4,13 @@ import ImmutablePropTypes from 'react-immutable-proptypes';
 import StatusList from 'mastodon/components/status_list';
 import { FormattedMessage } from 'react-intl';
 import { connect } from 'react-redux';
-import { fetchTrendingStatuses } from 'mastodon/actions/trends';
+import { fetchTrendingStatuses, expandTrendingStatuses } from 'mastodon/actions/trends';
+import { debounce } from 'lodash';
 
 const mapStateToProps = state => ({
   statusIds: state.getIn(['status_lists', 'trending', 'items']),
   isLoading: state.getIn(['status_lists', 'trending', 'isLoading'], true),
+  hasMore: !!state.getIn(['status_lists', 'trending', 'next']),
 });
 
 export default @connect(mapStateToProps)
@@ -17,6 +19,7 @@ class Statuses extends React.PureComponent {
   static propTypes = {
     statusIds: ImmutablePropTypes.list,
     isLoading: PropTypes.bool,
+    hasMore: PropTypes.bool,
     multiColumn: PropTypes.bool,
     dispatch: PropTypes.func.isRequired,
   };
@@ -26,8 +29,13 @@ class Statuses extends React.PureComponent {
     dispatch(fetchTrendingStatuses());
   }
 
+  handleLoadMore = debounce(() => {
+    const { dispatch } = this.props;
+    dispatch(expandTrendingStatuses());
+  }, 300, { leading: true })
+
   render () {
-    const { isLoading, statusIds, multiColumn } = this.props;
+    const { isLoading, hasMore, statusIds, multiColumn } = this.props;
 
     const emptyMessage = <FormattedMessage id='empty_column.explore_statuses' defaultMessage='Nothing is trending right now. Check back later!' />;
 
@@ -36,8 +44,9 @@ class Statuses extends React.PureComponent {
         trackScroll
         statusIds={statusIds}
         scrollKey='explore-statuses'
-        hasMore={false}
+        hasMore={hasMore}
         isLoading={isLoading}
+        onLoadMore={this.handleLoadMore}
         emptyMessage={emptyMessage}
         bindToDocument={!multiColumn}
         withCounters

app/javascript/mastodon/reducers/status_lists.js

@@ -21,6 +21,9 @@ import {
   TRENDS_STATUSES_FETCH_REQUEST,
   TRENDS_STATUSES_FETCH_SUCCESS,
   TRENDS_STATUSES_FETCH_FAIL,
+  TRENDS_STATUSES_EXPAND_REQUEST,
+  TRENDS_STATUSES_EXPAND_SUCCESS,
+  TRENDS_STATUSES_EXPAND_FAIL,
 } from '../actions/trends';
 import { Map as ImmutableMap, List as ImmutableList } from 'immutable';
 import {
@@ -111,11 +114,15 @@ export default function statusLists(state = initialState, action) {
   case BOOKMARKED_STATUSES_EXPAND_SUCCESS:
     return appendToList(state, 'bookmarks', action.statuses, action.next);
   case TRENDS_STATUSES_FETCH_REQUEST:
+  case TRENDS_STATUSES_EXPAND_REQUEST:
     return state.setIn(['trending', 'isLoading'], true);
   case TRENDS_STATUSES_FETCH_FAIL:
+  case TRENDS_STATUSES_EXPAND_FAIL:
     return state.setIn(['trending', 'isLoading'], false);
   case TRENDS_STATUSES_FETCH_SUCCESS:
     return normalizeList(state, 'trending', action.statuses, action.next);
+  case TRENDS_STATUSES_EXPAND_SUCCESS:
+    return appendToList(state, 'trending', action.statuses, action.next);
   case FAVOURITE_SUCCESS:
     return prependOneToList(state, 'favourites', action.status);
   case UNFAVOURITE_SUCCESS: