From 1400228a4394fe798092d9a144e28c1861d88ab9 Mon Sep 17 00:00:00 2001
From: Thibault Deckers <thibault.deckers@gmail.com>
Date: Thu, 4 Jun 2020 12:52:12 +0900
Subject: [PATCH] thumbnails: fade to higher quality

---
 lib/widgets/album/thumbnail/raster.dart     | 12 +++++++++++-
 lib/widgets/album/thumbnail_collection.dart |  2 +-
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/lib/widgets/album/thumbnail/raster.dart b/lib/widgets/album/thumbnail/raster.dart
index 78ee030e9..601f44229 100644
--- a/lib/widgets/album/thumbnail/raster.dart
+++ b/lib/widgets/album/thumbnail/raster.dart
@@ -89,7 +89,17 @@ class _ThumbnailRasterImageState extends State<ThumbnailRasterImage> {
         ? fastImage
         : Image(
             frameBuilder: (context, child, frame, wasSynchronouslyLoaded) {
-              return frame == null ? fastImage : child;
+              if (wasSynchronouslyLoaded) return child;
+              return AnimatedSwitcher(
+                duration: const Duration(milliseconds: 200),
+                transitionBuilder: (child, animation) => child == fastImage
+                    ? child
+                    : FadeTransition(
+                        opacity: animation,
+                        child: child,
+                      ),
+                child: frame == null ? fastImage : child,
+              );
             },
             image: _sizedThumbnailProvider,
             width: extent,
diff --git a/lib/widgets/album/thumbnail_collection.dart b/lib/widgets/album/thumbnail_collection.dart
index 72814abbc..b515d0af1 100644
--- a/lib/widgets/album/thumbnail_collection.dart
+++ b/lib/widgets/album/thumbnail_collection.dart
@@ -33,7 +33,7 @@ class ThumbnailCollection extends StatelessWidget {
           final mqSize = mq.item1;
           final mqHorizontalPadding = mq.item2;
           TileExtentManager.applyTileExtent(mqSize, mqHorizontalPadding, _tileExtentNotifier);
-          final cacheExtent = TileExtentManager.extentMaxForSize(mqSize);
+          final cacheExtent = TileExtentManager.extentMaxForSize(mqSize) * 2;
 
           // do not replace by Provider.of<CollectionLens>
           // so that view updates on collection filter changes