private void PageDecodedHandler(DjvuPage page, TextLayerZone textLayer, CancellationToken ct)
{
if (ct.IsCancellationRequested)
{
return;
}
Page = page;
_pageViewObserver = State.ZoomFactorObserver;
_pageViewObserver.ZoomFactorChanging += HandleZoomFactorChanging;
_pageViewObserver.ZoomFactorChanged += HandleZoomFactorChanged;
Width = State.Width;
Height = State.Height;
CreateThumbnailSurface();
if (!_pageViewObserver.IsZooming)
{
CreateContentSurface();
}
TextLayer = textLayer != null ? new[] { textLayer } : Array.Empty <TextLayerZone>();
}
public PageViewControlState(DjvuDocument document, uint pageNumber, double width, double height, PageViewObserver zoomFactorObserver)
{
Document = document;
PageNumber = pageNumber;
Width = width;
Height = height;
ZoomFactorObserver = zoomFactorObserver;
}
private void OnTextLayerChanged()
{
if (TextLayer != null)
{
_pageViewObserver = State.ZoomFactorObserver;
_pageViewObserver.SelectionChanging += HandleSelectionChanging;
_pageViewObserver.SearchHighlightingRedrawingRequested += HandleSearchHighlightingRedrawingRequested;
RedrawSelection();
RedrawSearchHighlighting();
}
else
{
_pageViewObserver.SelectionChanging -= HandleSelectionChanging;
_pageViewObserver.SearchHighlightingRedrawingRequested -= HandleSearchHighlightingRedrawingRequested;
_pageViewObserver = null;
selectionShape.Data = null;
searchHighlightingShape.Data = null;
}
}
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 Load()
{
if (Source == null || _containerSize == null)
{
return;
}
_pageViewObserver = new PageViewObserver();
var pageInfos = Source.GetPageInfos();
var maxPageWidth = pageInfos.Max(pageInfo => pageInfo.Width);
_pageStates = new PageViewControlState[Source.PageCount];
for (uint i = 0; i < _pageStates.Length; i++)
{
var pageInfo = pageInfos[i];
double pageWidth = pageInfo.Width;
double pageHeight = pageInfo.Height;
var scaleFactor = pageWidth / maxPageWidth;
var aspectRatio = pageWidth / pageHeight;
var width = scaleFactor * _containerSize.Value.Width;
var height = width / aspectRatio;
_pageStates[i] = new PageViewControlState(
document: Source,
pageNumber: i + 1,
width: width,
height: height,
zoomFactorObserver: _pageViewObserver);
}
PageNumber = 1;
listView.ItemsSource = _pageStates;
}
private void Unload()
{
_pageViewObserver = null;
_pageStates = null;
listView.ItemsSource = null;
}
