原生epub阅读

lib/pages/epub_reader/mixins/image_viewer_mixin.dart

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+part of '../reader_screen.dart';
+
+mixin _ImageViewerMixin on State<ReaderScreen> {
+  // === Borrowed state (provided by _ReaderScreenState fields) ===
+  BookSession get bookSession;
+
+  bool get showControls;
+
+  bool get isImageViewerVisible;
+  set isImageViewerVisible(bool v);
+
+  Uint8List? get currentImageData;
+  set currentImageData(Uint8List? v);
+
+  Rect? get currentImageRect;
+  set currentImageRect(Rect? v);
+
+  Future<void> handleImageLongPress(String imageUrl, Rect rect) async {
+    if (!bookSession.isLoaded) return;
+    if (showControls) return;
+
+    // Resolve image bytes from the epub via webViewHandler
+    final data = await webViewHandler.resolveImageFromEpub(
+      epubPath: bookSession.book['file_path'] as String? ?? '',
+      imageUrl: imageUrl,
+      fileHash: widget.bookId,
+    );
+    if (data == null || !mounted) return;
+
+    setState(() {
+      currentImageData = data;
+      currentImageRect = rect;
+      isImageViewerVisible = true;
+    });
+  }
+
+  void closeImageViewer() {
+    setState(() {
+      isImageViewerVisible = false;
+      currentImageData = null;
+      currentImageRect = null;
+    });
+  }
+
+  // Cross-reference: webViewHandler is defined in _ReaderScreenState
+  EpubWebViewHandler get webViewHandler;
+}