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lib/pages/epub_reader/mixins/footnote_mixin.dart

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+part of '../reader_screen.dart';
+
+mixin _FootnoteMixin on State<ReaderScreen> {
+  // === Borrowed state (provided by _ReaderScreenState fields) ===
+  OverlayEntry? get footnoteOverlayEntry;
+  set footnoteOverlayEntry(OverlayEntry? v);
+
+  GlobalKey<FootnotePopupOverlayState> get footnoteKey;
+
+  bool get isClosingFootnote;
+  set isClosingFootnote(bool v);
+
+  EpubWebViewHandler get webViewHandler;
+
+  BookSession get bookSession;
+
+  ReaderSettings get readerSettings;
+
+  // === Cross-mixin: _ThemeMixin ===
+  EpubTheme getEpubTheme();
+
+  void handleFootnoteTap(String innerHtml, Rect rect, String baseUrl) {
+    removeFootnoteOverlay();
+    final overlayState = Overlay.of(context);
+    final colorScheme = Theme.of(context).colorScheme;
+    setState(() {
+      footnoteOverlayEntry = OverlayEntry(
+        builder: (context) => FootnotePopupOverlay(
+          key: footnoteKey,
+          anchorRect: rect,
+          rawHtml: innerHtml,
+          onDismiss: () => removeFootnoteOverlay(),
+          colorScheme: colorScheme,
+          zoom: readerSettings.zoom,
+        ),
+      );
+    });
+    overlayState.insert(footnoteOverlayEntry!);
+  }
+
+  Future<void> removeFootnoteOverlay({bool animate = true}) async {
+    if (footnoteOverlayEntry == null || isClosingFootnote) return;
+
+    if (animate) {
+      isClosingFootnote = true;
+      if (footnoteKey.currentState != null) {
+        await footnoteKey.currentState!.playReverseAnimation();
+      }
+    }
+
+    footnoteOverlayEntry?.remove();
+    setState(() {
+      footnoteOverlayEntry = null;
+      isClosingFootnote = false;
+    });
+  }
+}