Start on infinite scroll pagination

api/graphql/generated.go

@@ -152,7 +152,7 @@ type ComplexityRoot struct {
 		MyAlbums                   func(childComplexity int, filter *models.Filter, onlyRoot *bool, showEmpty *bool, onlyWithFavorites *bool) int
 		MyMedia                    func(childComplexity int, filter *models.Filter) int
 		MyMediaGeoJSON             func(childComplexity int) int
-		MyTimeline                 func(childComplexity int, onlyFavorites *bool) int
+		MyTimeline                 func(childComplexity int, limit *int, offset *int, onlyFavorites *bool) int
 		MyUser                     func(childComplexity int) int
 		Search                     func(childComplexity int, query string, limitMedia *int, limitAlbums *int) int
 		ShareToken                 func(childComplexity int, token string, password *string) int
@@ -272,7 +272,7 @@ type QueryResolver interface {
 	MyMedia(ctx context.Context, filter *models.Filter) ([]*models.Media, error)
 	Media(ctx context.Context, id int) (*models.Media, error)
 	MediaList(ctx context.Context, ids []int) ([]*models.Media, error)
-	MyTimeline(ctx context.Context, onlyFavorites *bool) ([]*models.TimelineGroup, error)
+	MyTimeline(ctx context.Context, limit *int, offset *int, onlyFavorites *bool) ([]*models.TimelineGroup, error)
 	MyMediaGeoJSON(ctx context.Context) (interface{}, error)
 	MapboxToken(ctx context.Context) (*string, error)
 	ShareToken(ctx context.Context, token string, password *string) (*models.ShareToken, error)
@@ -950,7 +950,7 @@ func (e *executableSchema) Complexity(typeName, field string, childComplexity in
 			return 0, false
 		}
 
-		return e.complexity.Query.MyTimeline(childComplexity, args["onlyFavorites"].(*bool)), true
+		return e.complexity.Query.MyTimeline(childComplexity, args["limit"].(*int), args["offset"].(*int), args["onlyFavorites"].(*bool)), true
 
 	case "Query.myUser":
 		if e.complexity.Query.MyUser == nil {
@@ -1400,7 +1400,7 @@ type Query {
   "Get a list of media by their ids, user must own the media or be admin"
   mediaList(ids: [ID!]!): [Media!]!
 
-  myTimeline(onlyFavorites: Boolean): [TimelineGroup!]!
+  myTimeline(limit: Int, offset: Int, onlyFavorites: Boolean): [TimelineGroup!]!
 
   "Get media owned by the logged in user, returned in GeoJson format"
   myMediaGeoJson: Any!
@@ -2195,15 +2195,33 @@ func (ec *executionContext) field_Query_myMedia_args(ctx context.Context, rawArg
 func (ec *executionContext) field_Query_myTimeline_args(ctx context.Context, rawArgs map[string]interface{}) (map[string]interface{}, error) {
 	var err error
 	args := map[string]interface{}{}
-	var arg0 *bool
-	if tmp, ok := rawArgs["onlyFavorites"]; ok {
-		ctx := graphql.WithPathContext(ctx, graphql.NewPathWithField("onlyFavorites"))
-		arg0, err = ec.unmarshalOBoolean2ᚖbool(ctx, tmp)
+	var arg0 *int
+	if tmp, ok := rawArgs["limit"]; ok {
+		ctx := graphql.WithPathContext(ctx, graphql.NewPathWithField("limit"))
+		arg0, err = ec.unmarshalOInt2ᚖint(ctx, tmp)
 		if err != nil {
 			return nil, err
 		}
 	}
-	args["onlyFavorites"] = arg0
+	args["limit"] = arg0
+	var arg1 *int
+	if tmp, ok := rawArgs["offset"]; ok {
+		ctx := graphql.WithPathContext(ctx, graphql.NewPathWithField("offset"))
+		arg1, err = ec.unmarshalOInt2ᚖint(ctx, tmp)
+		if err != nil {
+			return nil, err
+		}
+	}
+	args["offset"] = arg1
+	var arg2 *bool
+	if tmp, ok := rawArgs["onlyFavorites"]; ok {
+		ctx := graphql.WithPathContext(ctx, graphql.NewPathWithField("onlyFavorites"))
+		arg2, err = ec.unmarshalOBoolean2ᚖbool(ctx, tmp)
+		if err != nil {
+			return nil, err
+		}
+	}
+	args["onlyFavorites"] = arg2
 	return args, nil
 }
 
@@ -5231,7 +5249,7 @@ func (ec *executionContext) _Query_myTimeline(ctx context.Context, field graphql
 	fc.Args = args
 	resTmp, err := ec.ResolverMiddleware(ctx, func(rctx context.Context) (interface{}, error) {
 		ctx = rctx // use context from middleware stack in children
-		return ec.resolvers.Query().MyTimeline(rctx, args["onlyFavorites"].(*bool))
+		return ec.resolvers.Query().MyTimeline(rctx, args["limit"].(*int), args["offset"].(*int), args["onlyFavorites"].(*bool))
 	})
 	if err != nil {
 		ec.Error(ctx, err)

api/graphql/resolvers/timeline.go

@@ -9,7 +9,7 @@ import (
 	"gorm.io/gorm"
 )
 
-func (r *queryResolver) MyTimeline(ctx context.Context, onlyFavorites *bool) ([]*models.TimelineGroup, error) {
+func (r *queryResolver) MyTimeline(ctx context.Context, limit *int, offset *int, onlyFavorites *bool) ([]*models.TimelineGroup, error) {
 	user := auth.UserFromContext(ctx)
 	if user == nil {
 		return nil, auth.ErrUnauthorized
@@ -33,6 +33,14 @@ func (r *queryResolver) MyTimeline(ctx context.Context, onlyFavorites *bool) ([]
 			daysQuery.Where("media.id IN (?)", tx.Table("user_media_data").Select("user_media_data.media_id").Where("user_media_data.user_id = ?", user.ID).Where("user_media_data.favorite = 1"))
 		}
 
+		if limit != nil {
+			daysQuery.Limit(*limit)
+		}
+
+		if offset != nil {
+			daysQuery.Offset(*offset)
+		}
+
 		rows, err := daysQuery.Group("albums.id, YEAR(media.date_shot), MONTH(media.date_shot), DAY(media.date_shot)").
 			Order("media.date_shot DESC").
 			Rows()

api/graphql/schema.graphql

@@ -44,7 +44,7 @@ type Query {
   "Get a list of media by their ids, user must own the media or be admin"
   mediaList(ids: [ID!]!): [Media!]!
 
-  myTimeline(onlyFavorites: Boolean): [TimelineGroup!]!
+  myTimeline(limit: Int, offset: Int, onlyFavorites: Boolean): [TimelineGroup!]!
 
   "Get media owned by the logged in user, returned in GeoJson format"
   myMediaGeoJson: Any!

ui/src/Pages/AlbumPage/AlbumPage.js

@@ -4,7 +4,7 @@ import { useQuery, gql } from '@apollo/client'
 import AlbumGallery from '../../components/albumGallery/AlbumGallery'
 import PropTypes from 'prop-types'
 import Layout from '../../Layout'
-import useURLParameters from '../../components/useURLParameters'
+import useURLParameters from '../../hooks/useURLParameters'
 
 const albumQuery = gql`
   query albumQuery(

ui/src/apolloClient.js

@@ -5,7 +5,10 @@ import {
   ApolloLink,
   HttpLink,
 } from '@apollo/client'
-import { getMainDefinition } from '@apollo/client/utilities'
+import {
+  getMainDefinition,
+  offsetLimitPagination,
+} from '@apollo/client/utilities'
 import { onError } from '@apollo/client/link/error'
 import { WebSocketLink } from '@apollo/client/link/ws'
 
@@ -111,6 +114,11 @@ const memoryCache = new InMemoryCache({
     SiteInfo: {
       merge: true,
     },
+    Query: {
+      fields: {
+        myTimeline: offsetLimitPagination(['onlyFavorites']),
+      },
+    },
   },
 })
 

ui/src/components/timelineGallery/TimelineGallery.js

@@ -5,12 +5,13 @@ import TimelineGroupDate from './TimelineGroupDate'
 import styled from 'styled-components'
 import PresentView from '../photoGallery/presentView/PresentView'
 import { Loader } from 'semantic-ui-react'
-import useURLParameters from '../useURLParameters'
+import useURLParameters from '../../hooks/useURLParameters'
 import { FavoritesCheckbox } from '../AlbumFilter'
+import useScrollPagination from '../../hooks/useScrollPagination'
 
 const MY_TIMELINE_QUERY = gql`
-  query myTimeline($onlyFavorites: Boolean) {
-    myTimeline(onlyFavorites: $onlyFavorites) {
+  query myTimeline($onlyFavorites: Boolean, $limit: Int, $offset: Int) {
+    myTimeline(onlyFavorites: $onlyFavorites, limit: $limit, offset: $offset) {
       album {
         id
         title
@@ -123,9 +124,26 @@ const TimelineGallery = () => {
     })
   }, [activeIndex])
 
-  const { data, error, loading, refetch } = useQuery(MY_TIMELINE_QUERY, {
-    variables: {
-      onlyFavorites,
+  const { data, error, loading, refetch, fetchMore } = useQuery(
+    MY_TIMELINE_QUERY,
+    {
+      variables: {
+        onlyFavorites,
+        offset: 0,
+        limit: 10,
+      },
+    }
+  )
+
+  const { containerElem } = useScrollPagination({
+    loading,
+    fetchMore: () => {
+      console.log('fetching more')
+      fetchMore({
+        variables: {
+          offset: data.myTimeline.length,
+        },
+      })
     },
   })
 
@@ -190,7 +208,7 @@ const TimelineGallery = () => {
         onlyFavorites={onlyFavorites}
         setOnlyFavorites={setOnlyFavorites}
       />
-      <GalleryWrapper>{timelineGroups}</GalleryWrapper>
+      <GalleryWrapper ref={containerElem}>{timelineGroups}</GalleryWrapper>
       {presenting && (
         <PresentView
           media={

ui/src/hooks/useScrollPagination.js

@@ -0,0 +1,65 @@
+import { useCallback, useEffect, useRef } from 'react'
+
+const useScrollPagination = ({ loading, fetchMore }) => {
+  const observer = useRef(null)
+  const observerElem = useRef(null)
+
+  const reconfigureIntersectionObserver = () => {
+    var options = {
+      root: null,
+      rootMargin: '-100% 0px 0px 0px',
+      threshold: 0,
+    }
+
+    // delete old observer
+    if (observer.current) observer.current.disconnect()
+
+    // configure new observer
+    observer.current = new IntersectionObserver(entities => {
+      console.log('Observing', entities)
+      if (entities.find(x => x.isIntersecting == false)) {
+        console.log('load more')
+        fetchMore()
+      }
+    }, options)
+
+    // activate new observer
+    if (observerElem.current && !loading)
+      observer.current.observe(observerElem.current)
+  }
+
+  const containerElem = useCallback(node => {
+    observerElem.current = node
+
+    // cleanup
+    if (observer.current != null) {
+      observer.current.disconnect()
+    }
+
+    if (node != null) {
+      reconfigureIntersectionObserver()
+    }
+  }, [])
+
+  // only observe when not loading
+  useEffect(() => {
+    if (observer.current != null) {
+      if (loading) {
+        observer.current.unobserve(observerElem.current)
+      } else {
+        observer.current.observe(observerElem.current)
+      }
+    }
+  }, [loading])
+
+  // reconfigure observer if fetchMore function changes
+  useEffect(() => {
+    reconfigureIntersectionObserver()
+  }, [fetchMore])
+
+  return {
+    containerElem,
+  }
+}
+
+export default useScrollPagination