adjustPages method

Implementation

void adjustPages(
  int pageIndex,
  PdfViewerController pdfViewerController, {
  bool isAdd = true,
}) async {
  final newUnderlineHistory = <int, List<AnnotationAction>>{};
  final newUnderlineUndoStack = <int, List<AnnotationAction>>{};

  // Adjust the history and undo stack to shift annotations accordingly
  _underlineHistory.forEach((key, value) {
    if (isAdd) {
      newUnderlineHistory[key >= pageIndex ? key + 1 : key] = value;
    } else {
      if (key == pageIndex) {
        // Skip the deleted page
      } else {
        newUnderlineHistory[key > pageIndex ? key - 1 : key] = value;
      }
    }
  });

  _underlineUndoStack.forEach((key, value) {
    if (isAdd) {
      newUnderlineUndoStack[key >= pageIndex ? key + 1 : key] = value;
    } else {
      if (key == pageIndex) {
        // Skip the deleted page
      } else {
        newUnderlineUndoStack[key > pageIndex ? key - 1 : key] = value;
      }
    }
  });

  // Replace the old history and undo stack with the updated versions
  _underlineHistory
    ..clear()
    ..addAll(newUnderlineHistory);
  _underlineUndoStack
    ..clear()
    ..addAll(newUnderlineUndoStack);

  // Adjust the current page if necessary based on the operation
  if (!isAdd && _currentPage > pageIndex) {
    _currentPage -= 1;
  } else if (isAdd && _currentPage >= pageIndex) {
    _currentPage += 1;
  }

  // Ensure annotations are visible after the adjustment
  unhide(pdfViewerController);

  notifyListeners();
}