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lib/pages/epub_reader/mixins/progress_mixin.dart

@@ -18,18 +18,31 @@ mixin _ProgressMixin on State<ReaderScreen> {
   Timer? get progressDebouncer;
   set progressDebouncer(Timer? v);
 
+  Map<int, int> get chapterPageCounts;
+
   void updateProgressDebounced() {
     progressDebouncer?.cancel();
     progressDebouncer = Timer(const Duration(milliseconds: 150), () {
       if (!mounted) return;
       if (isWebViewLoading) return;
 
-      final pageInChapterStr =
-          '${currentPageInChapter + 1}/$totalPagesInChapter';
+      final totalChapters = bookSession.spine.length;
 
-      if (displayProgress != pageInChapterStr) {
+      // 用当前章节页数估算全书页数
+      final avgPages = totalPagesInChapter > 0 ? totalPagesInChapter : 1;
+      final estimatedTotalPages = avgPages * totalChapters;
+
+      // 估算绝对页码 = 已读章节数 * 平均每章页数 + 当前页
+      final estimatedAbsolutePage =
+          currentSpineItemIndex * avgPages + currentPageInChapter + 1;
+
+      final pageStr = totalChapters > 0
+          ? '$estimatedAbsolutePage/$estimatedTotalPages'
+          : '${currentPageInChapter + 1}/$totalPagesInChapter';
+
+      if (displayProgress != pageStr) {
         setState(() {
-          displayProgress = pageInChapterStr;
+          displayProgress = pageStr;
         });
       }
     });