Add a page to view cover

2025-12-16 15:11:14 +00:00 · 2025-10-02 22:43:00 +08:00
parent 6ce6066de2
commit 44bcce4385
2 changed files with 222 additions and 24 deletions
--- a/lib/pages/comic_details_page/cover_viewer.dart
+++ b/lib/pages/comic_details_page/cover_viewer.dart
@@ -0,0 +1,140 @@
+part of 'comic_page.dart';
+
+class _CoverViewer extends StatefulWidget {
+  const _CoverViewer({
+    required this.imageProvider,
+    required this.title,
+    required this.heroTag,
+  });
+
+  final ImageProvider imageProvider;
+  final String title;
+  final String heroTag;
+
+  @override
+  State<_CoverViewer> createState() => _CoverViewerState();
+}
+
+class _CoverViewerState extends State<_CoverViewer> {
+  bool isAppBarShow = true;
+
+  @override
+  Widget build(BuildContext context) {
+    return PopScope(
+      canPop: true,
+      child: Scaffold(
+        backgroundColor: context.colorScheme.surface,
+        body: Stack(
+          children: [
+            Positioned.fill(
+              child: PhotoView(
+                imageProvider: widget.imageProvider,
+                minScale: PhotoViewComputedScale.contained * 1.0,
+                maxScale: PhotoViewComputedScale.covered * 3.0,
+                backgroundDecoration: BoxDecoration(
+                  color: context.colorScheme.surface,
+                ),
+                loadingBuilder: (context, event) => Center(
+                  child: SizedBox(
+                    width: 24.0,
+                    height: 24.0,
+                    child: CircularProgressIndicator(
+                      value: event == null || event.expectedTotalBytes == null
+                          ? null
+                          : event.cumulativeBytesLoaded /
+                                event.expectedTotalBytes!,
+                    ),
+                  ),
+                ),
+                onTapUp: (context, details, controllerValue) {
+                  setState(() {
+                    isAppBarShow = !isAppBarShow;
+                  });
+                },
+                heroAttributes: PhotoViewHeroAttributes(tag: widget.heroTag),
+              ),
+            ),
+            AnimatedPositioned(
+              top: isAppBarShow ? 0 : -(context.padding.top + 52),
+              left: 0,
+              right: 0,
+              duration: const Duration(milliseconds: 180),
+              child: _buildAppBar(),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Widget _buildAppBar() {
+    return Material(
+      color: context.colorScheme.surface.toOpacity(0.72),
+      child: BlurEffect(
+        child: Container(
+          decoration: BoxDecoration(
+            border: Border(
+              bottom: BorderSide(
+                color: context.colorScheme.outlineVariant,
+                width: 0.5,
+              ),
+            ),
+          ),
+          height: 52,
+          child: Row(
+            children: [
+              const SizedBox(width: 8),
+              IconButton(
+                icon: const Icon(Icons.close),
+                onPressed: () {
+                  Navigator.of(context).pop();
+                },
+              ),
+              const SizedBox(width: 8),
+              Expanded(
+                child: Text(
+                  widget.title,
+                  style: const TextStyle(fontSize: 18),
+                  overflow: TextOverflow.ellipsis,
+                ),
+              ),
+              IconButton(
+                icon: const Icon(Icons.save_alt),
+                onPressed: _saveCover,
+              ),
+              const SizedBox(width: 8),
+            ],
+          ),
+        ).paddingTop(context.padding.top),
+      ),
+    );
+  }
+
+  void _saveCover() async {
+    try {
+      final imageStream = widget.imageProvider.resolve(
+        const ImageConfiguration(),
+      );
+      final completer = Completer<Uint8List>();
+
+      imageStream.addListener(
+        ImageStreamListener((ImageInfo info, bool _) async {
+          final byteData = await info.image.toByteData(
+            format: ImageByteFormat.png,
+          );
+          if (byteData != null) {
+            completer.complete(byteData.buffer.asUint8List());
+          }
+        }),
+      );
+
+      final data = await completer.future;
+      final fileType = detectFileType(data);
+      await saveFile(filename: "cover_${widget.title}${fileType.ext}", data: data);
+    } catch (e) {
+      if (mounted) {
+        context.showMessage(message: "Error".tl);
+      }
+    }
+  }
+}