/// <summary> /// Build cache /// </summary> private void BuildCache() { DocumentWalker walker = new DocumentWalker(); walker.VisualVisited += WalkerVisualVisited; walker.Walk(_flowDocument); }
/// <summary> /// Clones a visual block /// </summary> /// <param name="block">block to be cloned</param> /// <param name="pageNumber">current page number</param> /// <returns>cloned block</returns> /// <exception cref="InvalidProgramException">Error cloning XAML block</exception> private ContainerVisual CloneVisualBlock(Block block, int pageNumber) { FlowDocument tmpDoc = new FlowDocument(); tmpDoc.ColumnWidth = double.PositiveInfinity; tmpDoc.PageHeight = _report.PageHeight; tmpDoc.PageWidth = _report.PageWidth; tmpDoc.PagePadding = new Thickness(0); string xaml = XamlWriter.Save(block); Block newBlock = XamlReader.Parse(xaml) as Block; if (newBlock == null) { throw new InvalidProgramException("Error cloning XAML block"); } tmpDoc.Blocks.Add(newBlock); DocumentWalker walkerBlock = new DocumentWalker(); ArrayList blockValues = new ArrayList(); blockValues.AddRange(walkerBlock.Walk <IInlineContextValue>(tmpDoc)); // fill context values FillContextValues(blockValues, pageNumber); DocumentPage dp = ((IDocumentPaginatorSource)tmpDoc).DocumentPaginator.GetPage(0); return((ContainerVisual)dp.Visual); }
/// <summary> /// Creates a flow document of the report data /// </summary> /// <returns></returns> /// <exception cref="ArgumentException">XAML data does not represent a FlowDocument</exception> /// <exception cref="ArgumentException">Flow document must have a specified page height</exception> /// <exception cref="ArgumentException">Flow document must have a specified page width</exception> /// <exception cref="ArgumentException">"Flow document must have only one ReportProperties section, but it has {0}"</exception> internal FlowDocument CreateFlowDocument() { MemoryStream mem = new MemoryStream(); byte[] buf = Encoding.UTF8.GetBytes(_xamlData); mem.Write(buf, 0, buf.Length); mem.Position = 0; FlowDocument res = XamlReader.Load(mem) as FlowDocument; if (res == null) { throw new ArgumentException("XAML data does not represent a FlowDocument"); } if (res.PageHeight == double.NaN) { throw new ArgumentException("Flow document must have a specified page height"); } if (res.PageWidth == double.NaN) { throw new ArgumentException("Flow document must have a specified page width"); } // remember original values _pageHeight = res.PageHeight; _pageWidth = res.PageWidth; // search report properties DocumentWalker walker = new DocumentWalker(); List <SectionReportHeader> headers = walker.Walk <SectionReportHeader>(res); List <SectionReportFooter> footers = walker.Walk <SectionReportFooter>(res); List <ReportProperties> properties = walker.Walk <ReportProperties>(res); if (properties.Count > 0) { if (properties.Count > 1) { throw new ArgumentException(String.Format("Flow document must have only one ReportProperties section, but it has {0}", properties.Count)); } ReportProperties prop = properties[0]; if (prop.ReportName != null) { ReportName = prop.ReportName; } if (prop.ReportTitle != null) { ReportTitle = prop.ReportTitle; } // remove properties section from FlowDocument DependencyObject parent = prop.Parent; if (parent is FlowDocument) { ((FlowDocument)parent).Blocks.Remove(prop); parent = null; } if (parent is Section) { ((Section)parent).Blocks.Remove(prop); } } if (headers.Count > 0) { PageHeaderHeight = headers[0].PageHeaderHeight; } if (footers.Count > 0) { PageFooterHeight = footers[0].PageFooterHeight; } // make height smaller to have enough space for page header and page footer res.PageHeight = _pageHeight - _pageHeight * (PageHeaderHeight + PageFooterHeight) / 100d; // search image objects List <Image> images = new List <Image>(); walker.Tag = images; walker.VisualVisited += WalkerVisualVisited; walker.Walk(res); // load all images foreach (Image image in images) { if (ImageProcessing != null) { ImageProcessing(this, new ImageEventArgs(this, image)); } try { if (image.Tag is string) { image.Source = new BitmapImage(new Uri("file:///" + Path.Combine(_xamlImagePath, image.Tag.ToString()))); } } catch (Exception ex) { // fire event on exception and check for Handled = true after each invoke if (ImageError != null) { bool handled = false; lock (ImageError) { ImageErrorEventArgs eventArgs = new ImageErrorEventArgs(ex, this, image); foreach (var ed in ImageError.GetInvocationList()) { ed.DynamicInvoke(this, eventArgs); if (eventArgs.Handled) { handled = true; break; } } } if (!handled) { throw; } } else { throw; } } if (ImageProcessed != null) { ImageProcessed(this, new ImageEventArgs(this, image)); } // TODO: find a better way to specify file names } return(res); }