private void CleanUp()
{
if (_pageViewObserver != null)
{
_pageViewObserver.ZoomFactorChanging -= HandleZoomFactorChanging;
_pageViewObserver.ZoomFactorChanged -= HandleZoomFactorChanged;
_pageViewObserver = null;
}
if (_contentVsis != null)
{
_contentVsis.Dispose();
_contentVsis = null;
}
_thumbnailSis = null;
thumbnailContentCanvas.Background = null;
contentCanvas.Background = null;
contentCanvas.Children.Clear();
Page = null;
TextLayer = null;
}
private void UnloadedHandler(object sender, RoutedEventArgs e)
{
_contentVsis?.Dispose();
_contentVsis = null;
}
