private void CreateThumbnailSurface() { const uint scaleFactor = 8; var rawPixelsPerViewPixel = DisplayInformation.GetForCurrentView().RawPixelsPerViewPixel; var pageWidth = Page.Width / rawPixelsPerViewPixel; var pageHeight = Page.Height / rawPixelsPerViewPixel; var pageViewSize = new Size(pageWidth / scaleFactor, pageHeight / scaleFactor); _thumbnailSis = new SisPageRenderer(Page, pageViewSize); var thumbnailBackgroundBrush = new ImageBrush { ImageSource = _thumbnailSis.Source }; thumbnailContentCanvas.Background = thumbnailBackgroundBrush; }
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; }