Don't preload stuff in infinite scrolling containers, wait for them to be displayed (faster connection time)

src/lms/ui/PlayQueue.cpp

@@ -158,7 +158,7 @@ PlayQueue::PlayQueue()
 			for (const Database::TrackListEntry::pointer& entry : entries)
 				LmsApp->getDbSession().create<Database::TrackListEntry>(entry->getTrack(), queue);
 		}
-		_entriesContainer->clear();
+		_entriesContainer->reset();
 		addSome();
 	});
 
@@ -233,7 +233,6 @@ PlayQueue::PlayQueue()
 	});
 
 	updateInfo();
-	addSome();
 }
 
 bool
@@ -269,7 +268,7 @@ PlayQueue::clearTracks()
 		getQueue().modify()->clear();
 	}
 
-	_entriesContainer->clear();
+	_entriesContainer->reset();
 	_trackPos.reset();
 	updateInfo();
 }
@@ -436,6 +435,7 @@ PlayQueue::enqueueTracks(const std::vector<Database::TrackId>& trackIds)
 
 	updateInfo();
 	addSome();
+	_entriesContainer->setHasMore();
 }
 
 std::vector<Database::TrackId>
@@ -462,7 +462,7 @@ PlayQueue::getAndClearNextTracks()
 	}
 	else
 	{
-		_entriesContainer->clear();
+		_entriesContainer->reset();
 	}
 
 	return tracks;
@@ -517,8 +517,6 @@ PlayQueue::addSome()
 	const auto tracklistEntries {queue->getEntries(Database::Range {_entriesContainer->getCount(), _batchSize})};
 	for (const Database::TrackListEntry::pointer& tracklistEntry : tracklistEntries)
 		addEntry(tracklistEntry);
-
-	_entriesContainer->setHasMore(_entriesContainer->getCount() < queue->getCount());
 }
 
 void

src/lms/ui/common/InfiniteScrollingContainer.cpp

@@ -19,6 +19,7 @@
 
 #include "InfiniteScrollingContainer.hpp"
 
+#include <cassert>
 #include "LoadingIndicator.hpp"
 
 namespace UserInterface
@@ -28,14 +29,20 @@ namespace UserInterface
 		, _elements {bindNew<Wt::WContainerWidget>("elements")}
 		, _loadingIndicator {bindWidget<Wt::WTemplate>("loading-indicator", createLoadingIndicator())}
 	{
-		hideLoadingIndicator();
+		reset();
 	}
 
 	void
 	InfiniteScrollingContainer::clear()
+	{
+		assert(false);
+	}
+
+	void
+	InfiniteScrollingContainer::reset()
 	{
 		_elements->clear();
-		hideLoadingIndicator();
+		setHasMore(true);
 	}
 
 	std::size_t
@@ -50,6 +57,12 @@ namespace UserInterface
 		return _elements->addWidget(std::move(result));
 	}
 
+	void
+	InfiniteScrollingContainer::setHasMore()
+	{
+		setHasMore(true);
+	}
+
 	void
 	InfiniteScrollingContainer::setHasMore(bool hasMore)
 	{
@@ -103,7 +116,9 @@ namespace UserInterface
 			if (!visible)
 				return;
 
+			const auto previousCount {_elements->count()};
 			onRequestElements.emit();
+			setHasMore(previousCount != _elements->count());
 		});
 	}
 

src/lms/ui/common/InfiniteScrollingContainer.hpp

@@ -19,6 +19,7 @@
 
 #pragma once
 
+#include <memory>
 #include <optional>
 #include <utility>
 
@@ -29,13 +30,15 @@
 
 namespace UserInterface
 {
-	class InfiniteScrollingContainer : public Wt::WTemplate
+	// Atomatically raises onRequestElements signal when the sentinel is displayed
+	// can add elements afterwards by calling setHasMoreElements()
+	class InfiniteScrollingContainer final : public Wt::WTemplate
 	{
 		public:
 			// "text" must contain loading-indicator and "elements"
 			InfiniteScrollingContainer(const Wt::WString& text = Wt::WString::tr("Lms.infinite-scrolling-container.template"));
 
-			void clear();
+			void reset();
 			std::size_t getCount();
 			void add(std::unique_ptr<Wt::WWidget> result);
 
@@ -50,14 +53,15 @@ namespace UserInterface
 
 			Wt::WWidget*				getWidget(std::size_t pos) const;
 			std::optional<std::size_t>	getIndexOf(Wt::WWidget& widget) const;
-
-			void setHasMore(bool hasMore);
+			void 						setHasMore(); // can be used to add elements afterwards
 
 			Wt::Signal<>	onRequestElements;
 
 		private:
+			void clear() override;
 			void displayLoadingIndicator();
 			void hideLoadingIndicator();
+			void setHasMore(bool hasMore); // can be used to add elements afterwards
 
 			Wt::WContainerWidget*	_elements;
 			Wt::WTemplate*			_loadingIndicator;

src/lms/ui/explore/ArtistView.cpp

@@ -242,7 +242,6 @@ Artist::refreshReleases()
 			{
 				addSomeReleases(releases);
 			});
-			releases.container->setHasMore(true);
 		}
 	}
 	else
@@ -286,7 +285,6 @@ Artist::refreshAppearsOnReleases()
 		{
 			addSomeReleases(_appearsOnReleaseContainer);
 		});
-		_appearsOnReleaseContainer.container->setHasMore(true);
 	}
 	else
 	{
@@ -350,11 +348,6 @@ Artist::addSomeReleases(ReleaseContainer& releaseContainer)
 			const Database::Release::pointer release {Database::Release::find(LmsApp->getDbSession(), releaseContainer.releases[i])};
 			releaseContainer.container->add(ReleaseListHelpers::createEntryForArtist(release, artist));
 		}
-		releaseContainer.container->setHasMore(releaseContainer.container->getCount() < releaseContainer.releases.size());
-	}
-	else
-	{
-		releaseContainer.container->setHasMore(false);
 	}
 }
 
@@ -374,15 +367,10 @@ Artist::addSomeNonReleaseTracks()
 	params.setNonRelease(true);
 
 	const auto tracks {Track::find(LmsApp->getDbSession(), params)};
-	bool moreResults {tracks.moreResults};
-
 	for (const TrackId trackId : tracks.results)
 	{
 		if (_trackContainer->getCount() == _tracksMaxCount)
-		{
-			moreResults = false;
 			break;
-		}
 
 		const Track::pointer track {Track::find(LmsApp->getDbSession(), trackId)};
 		_trackContainer->add(TrackListHelpers::createEntry(track, _playQueueController, _filters));
@@ -390,8 +378,6 @@ Artist::addSomeNonReleaseTracks()
 		areTracksAdded = true;
 	}
 
-	_trackContainer->setHasMore(moreResults);
-
 	return areTracksAdded;
 }
 

src/lms/ui/explore/ArtistsView.cpp

@@ -102,9 +102,8 @@ Artists::Artists(Filters& filters)
 void
 Artists::refreshView()
 {
-	_container->clear();
+	_container->reset();
 	_artistCollector.reset();
-	addSome();
 }
 
 void
@@ -171,8 +170,6 @@ Artists::addSome()
 				_container->add(ArtistListHelpers::createEntry(artist));
 		}
 	}
-
-	_container->setHasMore(artistIds.moreResults);
 }
 
 } // namespace UserInterface

src/lms/ui/explore/ReleasesView.cpp

@@ -107,9 +107,8 @@ Releases::Releases(Filters& filters, PlayQueueController& playQueueController)
 void
 Releases::refreshView()
 {
-	_container->clear();
+	_container->reset();
 	_releaseCollector.reset();
-	addSome();
 }
 
 void
@@ -133,8 +132,6 @@ Releases::addSome()
 				_container->add(ReleaseListHelpers::createEntry(release));
 		}
 	}
-
-	_container->setHasMore(releaseIds.moreResults);
 }
 
 std::vector<ReleaseId>

src/lms/ui/explore/SearchView.cpp

@@ -88,9 +88,9 @@ namespace UserInterface
 	void
 	SearchView::refreshView()
 	{
-		_artists->clear();
-		_releases->clear();
-		_tracks->clear();
+		_artists->reset();
+		_releases->reset();
+		_tracks->reset();
 
 		addSomeArtists();
 		addSomeReleases();
@@ -104,7 +104,6 @@ namespace UserInterface
 
 		const Range range {_artists->getCount(), getBatchSize(Mode::Artist)};
 		const RangeResults<ArtistId> artistIds {_artistCollector.get(range)};
-
 		{
 			auto transaction {LmsApp->getDbSession().createSharedTransaction()};
 
@@ -114,8 +113,6 @@ namespace UserInterface
 				_artists->add(ArtistListHelpers::createEntry(artist));
 			}
 		}
-
-		_artists->setHasMore(artistIds.moreResults);
 	}
 
 	void
@@ -125,7 +122,6 @@ namespace UserInterface
 
 		const Range range {_releases->getCount(), getBatchSize(Mode::Release)};
 		const RangeResults<ReleaseId> releaseIds {_releaseCollector.get(range)};
-
 		{
 			auto transaction {LmsApp->getDbSession().createSharedTransaction()};
 
@@ -135,8 +131,6 @@ namespace UserInterface
 				_releases->add(ReleaseListHelpers::createEntry(release));
 			}
 		}
-
-		_releases->setHasMore(releaseIds.moreResults);
 	}
 
 	void
@@ -156,8 +150,6 @@ namespace UserInterface
 				_tracks->add(TrackListHelpers::createEntry(track, _playQueueController, _filters));
 			}
 		}
-
-		_tracks->setHasMore(trackIds.moreResults);
 	}
 } // namespace UserInterface
 

src/lms/ui/explore/TrackListView.cpp

@@ -179,8 +179,6 @@ namespace UserInterface
 		{
 			addSome();
 		});
-
-		addSome();
 	}
 
 	void
@@ -201,8 +199,6 @@ namespace UserInterface
 			if (const Track::pointer track {Track::find(LmsApp->getDbSession(), trackId)})
 				_container->add(TrackListHelpers::createEntry(track, _playQueueController, _filters));
 		}
-
-		_container->setHasMore(trackIds.moreResults && _container->getCount() < _maxCount);
 	}
 } // namespace UserInterface
 

src/lms/ui/explore/TrackListsView.cpp

@@ -34,7 +34,6 @@ using namespace Database;
 
 namespace UserInterface
 {
-
 	TrackLists::TrackLists(Filters& filters)
 	: Template {Wt::WString::tr("Lms.Explore.TrackLists.template")}
 	, _filters {filters}
@@ -92,9 +91,8 @@ namespace UserInterface
 	void
 	TrackLists::refreshView()
 	{
-		_container->clear();
+		_container->reset();
 		_trackListWidgets.clear();
-		addSome();
 	}
 
 	void
@@ -126,8 +124,6 @@ namespace UserInterface
 			if (const TrackList::pointer trackList {TrackList::find(LmsApp->getDbSession(), trackListId)})
 				addTracklist(trackList);
 		}
-
-		_container->setHasMore(trackListIds.moreResults && _container->getCount() <= _maxCount);
 	}
 
 	void

src/lms/ui/explore/TracksView.cpp

@@ -108,9 +108,8 @@ Tracks::Tracks(Filters& filters, PlayQueueController& playQueueController)
 void
 Tracks::refreshView()
 {
-	_container->clear();
+	_container->reset();
 	_trackCollector.reset();
-	addSome();
 }
 
 void
@@ -132,8 +131,6 @@ Tracks::addSome()
 		if (const Track::pointer track {Track::find(LmsApp->getDbSession(), trackId)})
 			_container->add(TrackListHelpers::createEntry(track, _playQueueController, _filters));
 	}
-
-	_container->setHasMore(trackIds.moreResults);
 }
 
 std::vector<Database::TrackId>