private void HandleZoomFactorChanging()
{
if (_contentVsis != null)
{
_contentVsis.Dispose();
_contentVsis = null;
}
}
private void CreateContentSurface()
{
var zoomFactor = _pageViewObserver.ZoomFactor;
var pageViewSize = new Size(Width * zoomFactor, Height * zoomFactor);
var thumbnailSize = _thumbnailSis.Source.Size;
if (pageViewSize.Width < thumbnailSize.Width && pageViewSize.Height < thumbnailSize.Height)
{
return;
}
_contentVsis = new VsisPageRenderer(Page, pageViewSize);
var contentBackgroundBrush = new ImageBrush
{
ImageSource = _contentVsis.Source
};
contentCanvas.Background = contentBackgroundBrush;
}
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;
}