/// <summary>
/// When a request for image source completes, remove the requesting ImageControl from the list of pending request states.
/// If all pending requests have been completed, raise conversion completed event
/// </summary>
protected virtual void OnGetImageSourceCompleted(object sender, GetImageSourceCompletedEventArgs e)
{
if (sender is PrintableStoryImageControl)
{
PrintableStoryImageControl imageControl = (PrintableStoryImageControl)sender;
if (_pendingImageRequestStates.Contains(imageControl))
{
_pendingImageRequestStates.Remove(imageControl);
}
imageControl.GetImageSourceCompleted -= GetImageSourceCompleted;
}
if (_pendingImageRequestStates.Count == 0)
{
// _userState is the target document
ConversionCompletedEventArgs args = new ConversionCompletedEventArgs(_requestedUserState, _targetDocument);
_dispatcher.BeginInvoke(DispatcherPriority.Input, new DispatcherOperationCallback(RaiseConversionCompleted), args);
_requestedUserState = null;
}
}
/// <summary>
/// Creates a paragraph with a PrintableStoryImageControl to display images, and adds the control to the list of pending image requests
/// </summary>
protected virtual Paragraph CreateImageParagraph(Story story, ImageReference imageReference, ImageData imageData, FlowDocumentStyleProvider styleProvider)
{
PrintableStoryImageControl imageControl = new PrintableStoryImageControl();
imageControl.ImageReference = imageReference;
imageControl.ImageData = imageData;
imageControl.Story = story;
MsdnStoryToFlowDocumentConverter.ApplyStyle(imageControl, GetImageControlStyle(styleProvider));
// Add the image control to the list of pending image request states
if (_pendingImageRequestStates == null)
{
_pendingImageRequestStates = new List <PrintableStoryImageControl>();
}
_pendingImageRequestStates.Add(imageControl);
HeightAligner heightAligner = CreateHeightAligner(imageControl, WhitespaceDistribution.Split, styleProvider);
Figure imageFigure = new Figure(new BlockUIContainer(heightAligner));
// Image figure may not be styled since we need to set its content and anchoring
if (imageData.Width < 600)
{
imageFigure.Width = new FigureLength(1, FigureUnitType.Column);
imageFigure.VerticalAnchor = FigureVerticalAnchor.ContentBottom;
imageFigure.HorizontalAnchor = FigureHorizontalAnchor.ColumnCenter;
}
else
{
imageFigure.Width = new FigureLength(2, FigureUnitType.Column);
imageFigure.VerticalAnchor = FigureVerticalAnchor.ContentBottom;
imageFigure.HorizontalAnchor = FigureHorizontalAnchor.ContentLeft;
}
Paragraph imageParagraph = new Paragraph(imageFigure);
MsdnStoryToFlowDocumentConverter.ApplyStyle(imageParagraph, GetImageContainerStyle(styleProvider));
return(imageParagraph);
}
