PdfZoomDetails constructor
Creates details for SfPdfViewer.onZoomLevelChanged callback.
Implementation
PdfZoomDetails(double newZoomLevel, double oldZoomLevel) {
  _newZoomLevel = newZoomLevel;
  _oldZoomLevel = oldZoomLevel;
}Creates details for SfPdfViewer.onZoomLevelChanged callback.
PdfZoomDetails(double newZoomLevel, double oldZoomLevel) {
  _newZoomLevel = newZoomLevel;
  _oldZoomLevel = oldZoomLevel;
}