Fix jank when using full height images, and other misc media preview imrpovements

lib/core/enums/view_mode.dart

@@ -1 +1,9 @@
-enum ViewMode { compact, comfortable }
+enum ViewMode {
+  compact(75.0),
+  comfortable(150.0);
+
+  /// The height of media previews for the given view mode
+  final double height;
+
+  const ViewMode(this.height);
+}

lib/post/utils/post.dart

@@ -299,6 +299,9 @@ Future<PostViewMedia> parsePostView(PostView postView, bool fetchImageDimensions
   if (thumbnailUrl != null && thumbnailUrl.isNotEmpty) {
     // Now check to see if there is a thumbnail image. If there is, we'll use that for the image
     media.mediaUrl = thumbnailUrl;
+  } else if (isImage) {
+    // If there is no thumbnail image, but the url is an image, we'll use that for the mediaUrl
+    media.mediaUrl = url;
   } else if (scrapeMissingPreviews) {
     // If there is no thumbnail image, we'll see if we should try to fetch the link metadata
     LinkInfo linkInfo = await getLinkInfo(url);
@@ -313,9 +316,9 @@ Future<PostViewMedia> parsePostView(PostView postView, bool fetchImageDimensions
     Size result = Size(MediaQuery.of(GlobalContext.context).size.width, 200);
 
     try {
-      result = await retrieveImageDimensions(imageUrl: media.mediaUrl);
+      result = await retrieveImageDimensions(imageUrl: media.mediaUrl ?? media.originalUrl).timeout(const Duration(seconds: 2));
     } catch (e) {
-      debugPrint('$e: Falling back to default image size');
+      debugPrint('${media.mediaUrl ?? media.originalUrl} - $e: Falling back to default image size');
     }
 
     Size size = MediaExtension.getScaledMediaSize(width: result.width, height: result.height, offset: edgeToEdgeImages ? 0 : 24, tabletMode: tabletMode);

lib/settings/pages/post_appearance_settings_page.dart

@@ -17,6 +17,7 @@ import 'package:thunder/core/enums/custom_theme_type.dart';
 import 'package:thunder/core/enums/feed_card_divider_thickness.dart';
 import 'package:thunder/core/enums/local_settings.dart';
 import 'package:thunder/core/enums/post_body_view_type.dart';
+import 'package:thunder/core/enums/view_mode.dart';
 import 'package:thunder/core/models/post_view_media.dart';
 import 'package:thunder/core/singletons/preferences.dart';
 import 'package:thunder/feed/feed.dart';
@@ -1159,8 +1160,8 @@ class _PostAppearanceSettingsPageState extends State<PostAppearanceSettingsPage>
         children: [
           !showThumbnailPreviewOnRight
               ? Container(
-                  width: 75,
-                  height: 75,
+                  width: ViewMode.compact.height,
+                  height: ViewMode.compact.height,
                   margin: const EdgeInsets.only(right: 8.0),
                   decoration: BoxDecoration(
                     color: theme.dividerColor,
@@ -1212,8 +1213,8 @@ class _PostAppearanceSettingsPageState extends State<PostAppearanceSettingsPage>
           ),
           showThumbnailPreviewOnRight
               ? Container(
-                  width: 75,
-                  height: 75,
+                  width: ViewMode.compact.height,
+                  height: ViewMode.compact.height,
                   margin: const EdgeInsets.only(right: 8.0),
                   decoration: BoxDecoration(
                     color: theme.dividerColor,

lib/shared/link_preview_card.dart

@@ -80,21 +80,21 @@ class LinkPreviewCard extends StatelessWidget {
                         child: ImagePreview(
                           read: read,
                           url: mediaURL ?? originURL!,
-                          height: showFullHeightImages ? mediaHeight : 150,
+                          height: showFullHeightImages ? mediaHeight : ViewMode.comfortable.height,
                           width: mediaWidth ?? MediaQuery.of(context).size.width - (edgeToEdgeImages ? 0 : 24),
                           isExpandable: false,
                         ),
                       )
                     : ImagePreview(
                         read: read,
                         url: mediaURL ?? originURL!,
-                        height: showFullHeightImages ? mediaHeight : 150,
+                        height: showFullHeightImages ? mediaHeight : ViewMode.comfortable.height,
                         width: mediaWidth ?? MediaQuery.of(context).size.width - (edgeToEdgeImages ? 0 : 24),
                         isExpandable: false,
                       )
               ] else if (scrapeMissingPreviews)
                 SizedBox(
-                  height: 150,
+                  height: ViewMode.comfortable.height,
                   // This is used for external links when Lemmy does not provide a preview thumbnail
                   // and when the user has enabled external scraping.
                   // This is only used in comfortable mode.
@@ -161,22 +161,22 @@ class LinkPreviewCard extends StatelessWidget {
                         child: ImagePreview(
                           read: read,
                           url: mediaURL!,
-                          height: 75,
-                          width: 75,
+                          height: ViewMode.compact.height,
+                          width: ViewMode.compact.height,
                           isExpandable: false,
                         ),
                       )
                     : ImagePreview(
                         read: read,
                         url: mediaURL!,
-                        height: 75,
-                        width: 75,
+                        height: ViewMode.compact.height,
+                        width: ViewMode.compact.height,
                         isExpandable: false,
                       )
                 : scrapeMissingPreviews
                     ? SizedBox(
-                        height: 75,
-                        width: 75,
+                        height: ViewMode.compact.height,
+                        width: ViewMode.compact.height,
                         // This is used for external links when Lemmy does not provide a preview thumbnail
                         // and when the user has enabled external scraping.
                         // This is only used in compact mode.
@@ -201,8 +201,8 @@ class LinkPreviewCard extends StatelessWidget {
                     // This is used for link previews when no thumbnail comes from Lemmy
                     // and the user has disabled scraping. This is only in compact mode.
                     : Container(
-                        height: 75,
-                        width: 75,
+                        height: ViewMode.compact.height,
+                        width: ViewMode.compact.height,
                         color: theme.cardColor.darken(5),
                         child: Icon(
                           hideNsfw ? null : Icons.language,

lib/shared/media_view.dart

@@ -96,8 +96,8 @@ class _MediaViewState extends State<MediaView> with SingleTickerProviderStateMix
         color: theme.cardColor.darken(5),
         child: widget.postViewMedia.postView.post.body?.isNotEmpty == true
             ? SizedBox(
-                height: 75.0,
-                width: 75.0,
+                height: ViewMode.compact.height,
+                width: ViewMode.compact.height,
                 child: Padding(
                   padding: const EdgeInsets.all(10.0),
                   child: Align(
@@ -113,8 +113,8 @@ class _MediaViewState extends State<MediaView> with SingleTickerProviderStateMix
                 ),
               )
             : Container(
-                height: 75,
-                width: 75,
+                height: ViewMode.compact.height,
+                width: ViewMode.compact.height,
                 color: theme.cardColor.darken(5),
                 child: Icon(
                   Icons.text_fields_rounded,
@@ -163,8 +163,29 @@ class _MediaViewState extends State<MediaView> with SingleTickerProviderStateMix
       },
       child: Container(
         clipBehavior: Clip.hardEdge,
-        decoration: BoxDecoration(borderRadius: BorderRadius.circular((widget.edgeToEdgeImages ? 0 : 12))),
+        decoration: BoxDecoration(
+          borderRadius: BorderRadius.circular((widget.edgeToEdgeImages ? 0 : 12)),
+          color: theme.colorScheme.primary.withOpacity(0.2),
+        ),
+        constraints: BoxConstraints(
+            maxHeight: switch (widget.viewMode) {
+              ViewMode.compact => ViewMode.compact.height,
+              ViewMode.comfortable => widget.showFullHeightImages ? widget.postViewMedia.media.first.height ?? ViewMode.comfortable.height : ViewMode.comfortable.height,
+            },
+            minHeight: switch (widget.viewMode) {
+              ViewMode.compact => ViewMode.compact.height,
+              ViewMode.comfortable => widget.showFullHeightImages ? widget.postViewMedia.media.first.height ?? ViewMode.comfortable.height : ViewMode.comfortable.height,
+            },
+            maxWidth: switch (widget.viewMode) {
+              ViewMode.compact => ViewMode.compact.height,
+              ViewMode.comfortable => widget.edgeToEdgeImages ? double.infinity : MediaQuery.of(context).size.width,
+            },
+            minWidth: switch (widget.viewMode) {
+              ViewMode.compact => ViewMode.compact.height,
+              ViewMode.comfortable => widget.edgeToEdgeImages ? double.infinity : MediaQuery.of(context).size.width,
+            }),
         child: Stack(
+          fit: StackFit.expand,
           alignment: Alignment.center,
           children: [
             ImageFiltered(
@@ -218,8 +239,18 @@ class _MediaViewState extends State<MediaView> with SingleTickerProviderStateMix
     final theme = Theme.of(context);
     final state = context.read<ThunderBloc>().state;
 
-    double? height = widget.viewMode == ViewMode.compact ? 75 : (widget.showFullHeightImages ? widget.postViewMedia.media.first.height : 150);
-    double width = widget.viewMode == ViewMode.compact ? 75 : MediaQuery.of(context).size.width - (widget.edgeToEdgeImages ? 0 : 24);
+    double? width;
+    double? height;
+
+    switch (widget.viewMode) {
+      case ViewMode.compact:
+        width = null; // Setting this to null will use the image's width. This will allow the image to not be stretched or squished.
+        height = ViewMode.compact.height;
+        break;
+      case ViewMode.comfortable:
+        width = MediaQuery.of(context).size.width - (widget.edgeToEdgeImages ? 0 : 24);
+        height = widget.showFullHeightImages ? widget.postViewMedia.media.first.height : null;
+    }
 
     return ExtendedImage.network(
       color: widget.read == true ? const Color.fromRGBO(255, 255, 255, 0.5) : null,
@@ -230,9 +261,8 @@ class _MediaViewState extends State<MediaView> with SingleTickerProviderStateMix
       fit: widget.viewMode == ViewMode.compact ? BoxFit.cover : BoxFit.fitWidth,
       cache: true,
       clearMemoryCacheWhenDispose: state.imageCachingMode == ImageCachingMode.relaxed,
-      cacheWidth: widget.viewMode == ViewMode.compact
-          ? (75 * View.of(context).devicePixelRatio.ceil())
-          : ((MediaQuery.of(context).size.width - (widget.edgeToEdgeImages ? 0 : 24)) * View.of(context).devicePixelRatio.ceil()).toInt(),
+      cacheWidth: width != null ? (width * View.of(context).devicePixelRatio.ceil()).toInt() : null,
+      cacheHeight: height != null ? (height * View.of(context).devicePixelRatio.ceil()).toInt() : null,
       loadStateChanged: (ExtendedImageState state) {
         switch (state.extendedImageLoadState) {
           case LoadState.loading:

lib/shared/preview_image.dart

@@ -47,8 +47,8 @@ class _PreviewImageState extends State<PreviewImage> with SingleTickerProviderSt
     final ThunderState state = context.read<ThunderBloc>().state;
     final useDarkTheme = state.themeType == 'dark';
 
-    double? height = widget.viewMode == ViewMode.compact ? 75 : (widget.showFullHeightImages ? widget.height : 150);
-    double width = widget.viewMode == ViewMode.compact ? 75 : MediaQuery.of(context).size.width - 24;
+    double? height = widget.viewMode == ViewMode.compact ? ViewMode.compact.height : (widget.showFullHeightImages ? widget.height : ViewMode.comfortable.height);
+    double width = widget.viewMode == ViewMode.compact ? ViewMode.compact.height : MediaQuery.of(context).size.width - 24;
 
     return ExtendedImage.network(
       widget.mediaUrl,
@@ -57,7 +57,9 @@ class _PreviewImageState extends State<PreviewImage> with SingleTickerProviderSt
       fit: widget.viewMode == ViewMode.compact ? BoxFit.cover : BoxFit.fitWidth,
       cache: true,
       clearMemoryCacheWhenDispose: state.imageCachingMode == ImageCachingMode.relaxed,
-      cacheWidth: widget.viewMode == ViewMode.compact ? (75 * View.of(context).devicePixelRatio.ceil()) : ((MediaQuery.of(context).size.width - 24) * View.of(context).devicePixelRatio.ceil()).toInt(),
+      cacheWidth: widget.viewMode == ViewMode.compact
+          ? (ViewMode.compact.height * View.of(context).devicePixelRatio.ceil()).toInt()
+          : ((MediaQuery.of(context).size.width - 24) * View.of(context).devicePixelRatio.ceil()).toInt(),
       loadStateChanged: (ExtendedImageState state) {
         switch (state.extendedImageLoadState) {
           case LoadState.loading: