Den*_*nis 9 c# printing wpf xpsdocument flowdocument
题
BlockUIContainer？背景
我生成FlowDocument了一段文本,其中Rectangle包含DrawingBrushes从资源字典和BlockUIContainer自定义控件填充的一些元素.
在任何的FlowDocument*的观察时,所述文档正确呈现控制无论其当文档被转换为固定文档/ XpsDocument,没有一个Rectangle或BlockUIContainer元素渲染.
我几乎可以肯定这是因为没有测量/安排控件,但是无法弄清楚如何在转换为XpsDocument之前强制执行.
我已经LogicalTree递归地走过去做了以下事情,
UIElement element = (UIElement)d;
element.Measure(new Size(Double.PositiveInfinity, Double.PositiveInfinity));
element.Arrange(new Rect(element.DesiredSize));
element.UpdateLayout();
这里d是一个DependencyObject.我可以看到这在调试器中以break-pointed为单位设置ActualWidth和ActualHeight属性.
我试图Dispatcher按照Will♦的建议强制渲染.
用于打印XpsDocument的代码
public class XpsDocumentConverter
{
public static XpsDocumentReference CreateXpsDocument(FlowDocument document)
{
// Need to clone the document so that the paginator can work
FlowDocument clonedDocument = DocumentHelper.Clone<FlowDocument>(document);
Uri uri = new Uri(String.Format("pack://temp_{0}.xps/", Guid.NewGuid().ToString("N")));
MemoryStream ms = new MemoryStream();
Package pkg = Package.Open(ms, FileMode.Create, FileAccess.ReadWrite);
PackageStore.AddPackage(uri, pkg);
XpsDocument xpsDocument = new XpsDocument(pkg, CompressionOption.Normal, uri.AbsoluteUri);
XpsSerializationManager rsm = new XpsSerializationManager(new XpsPackagingPolicy(xpsDocument), false);
DocumentPaginator paginator = new FixedDocumentPaginator(clonedDocument, A4PageDefinition.Default);
rsm.SaveAsXaml(paginator);
return new XpsDocumentReference(ms, xpsDocument);
}
}
正如你所看到的,我也使用一个DocumentPaginator名为'FixedDocumentPaginator' 的自定义; 但是我不会发布那些代码,因为我怀疑问题就在那里,因为当它开始对文档进行分页时,GetPage(int pageNumber)所有内容都已经被转换了Visual,而且布局已经太晚了.
编辑
嗯.当我输入这个时,我想到克隆文档可能没有Measure/Arrange/UpdateLayout完成.
问题:如何在FlowDocument上强制执行度量/更新/排列？
我可以工作的一个可能的方法是在一个FlowDocumentViewers中显示克隆的文档(可能在屏幕外).
我刚才了解到的另一种可能的解决方案是: ContextLayoutManager.From(Dispatcher.CurrentDispatcher).UpdateLayout();
ContextLayoutManager 为您走逻辑树并更新布局.
用于克隆文档的代码
public static FlowDocument Clone(FlowDocument originalDocument)
{
FlowDocument clonedDocument = new FlowDocument();
TextRange sourceDocument = new TextRange(originalDocument.ContentStart, originalDocument.ContentEnd);
TextRange clonedDocumentRange = new TextRange(clonedDocument.ContentStart, clonedDocument.ContentEnd);
try
{
using (MemoryStream ms = new MemoryStream())
{
sourceDocument.Save(ms, DataFormats.XamlPackage);
clonedDocumentRange.Load(ms, DataFormats.XamlPackage);
}
clonedDocument.ColumnWidth = originalDocument.ColumnWidth;
clonedDocument.PageWidth = originalDocument.PageWidth;
clonedDocument.PageHeight = originalDocument.PageHeight;
clonedDocument.PagePadding = originalDocument.PagePadding;
clonedDocument.LineStackingStrategy = clonedDocument.LineStackingStrategy;
return clonedDocument;
}
catch (Exception)
{
}
return null;
}
Den*_*nis 10
将此作为与FlowDocument/FixedDocument/XpsDocument具有类似呈现问题的其他人的未来参考发布.
有几点需要注意:
BlockUIContainers使用上述方法时不会克隆.直到我使用一些辅助方法将调试窗口中的逻辑树打印出来之后,这并不是很明显(这些方法在下面发布 - 它们非常有用). ForceRenderFlowDocument
private static string ForceRenderFlowDocumentXaml =
@"<Window xmlns=""http://schemas.microsoft.com/netfx/2007/xaml/presentation""
xmlns:x=""http://schemas.microsoft.com/winfx/2006/xaml"">
<FlowDocumentScrollViewer Name=""viewer""/>
</Window>";
public static void ForceRenderFlowDocument(FlowDocument document)
{
using (var reader = new XmlTextReader(new StringReader(ForceRenderFlowDocumentXaml)))
{
Window window = XamlReader.Load(reader) as Window;
FlowDocumentScrollViewer viewer = LogicalTreeHelper.FindLogicalNode(window, "viewer") as FlowDocumentScrollViewer;
viewer.Document = document;
// Show the window way off-screen
window.WindowStartupLocation = WindowStartupLocation.Manual;
window.Top = Int32.MaxValue;
window.Left = Int32.MaxValue;
window.ShowInTaskbar = false;
window.Show();
// Ensure that dispatcher has done the layout and render passes
Dispatcher.CurrentDispatcher.Invoke(DispatcherPriority.Loaded, new Action(() => {}));
viewer.Document = null;
window.Close();
}
}
编辑:我刚刚添加window.ShowInTaskbar = false到方法中,好像你很快就可以看到窗口出现在任务栏中.
用户永远不会"看到"窗口,因为它位于屏幕外Int32.MaxValue- 这是早期多媒体创作(例如Macromedia/Adobe Director)当天常见的技巧.
对于搜索和查找此问题的人,我可以告诉您,没有其他方法可以强制文档呈现.
视觉和逻辑树助手
public static string WriteVisualTree(DependencyObject parent)
{
if (parent == null)
return "No Visual Tree Available. DependencyObject is null.";
using (var stringWriter = new StringWriter())
using (var indentedTextWriter = new IndentedTextWriter(stringWriter, " "))
{
WriteVisualTreeRecursive(indentedTextWriter, parent, 0);
return stringWriter.ToString();
}
}
private static void WriteVisualTreeRecursive(IndentedTextWriter writer, DependencyObject parent, int indentLevel)
{
if (parent == null)
return;
int childCount = VisualTreeHelper.GetChildrenCount(parent);
string typeName = parent.GetType().Name;
string objName = parent.GetValue(FrameworkElement.NameProperty) as string;
writer.Indent = indentLevel;
writer.WriteLine(String.Format("[{0:000}] {1} ({2}) {3}", indentLevel,
String.IsNullOrEmpty(objName) ? typeName : objName,
typeName, childCount)
);
for (int childIndex = 0; childIndex < childCount; ++childIndex)
WriteVisualTreeRecursive(writer, VisualTreeHelper.GetChild(parent, childIndex), indentLevel + 1);
}
public static string WriteLogicalTree(DependencyObject parent)
{
if (parent == null)
return "No Logical Tree Available. DependencyObject is null.";
using (var stringWriter = new StringWriter())
using (var indentedTextWriter = new IndentedTextWriter(stringWriter, " "))
{
WriteLogicalTreeRecursive(indentedTextWriter, parent, 0);
return stringWriter.ToString();
}
}
private static void WriteLogicalTreeRecursive(IndentedTextWriter writer, DependencyObject parent, int indentLevel)
{
if (parent == null)
return;
var children = LogicalTreeHelper.GetChildren(parent).OfType<DependencyObject>();
int childCount = children.Count();
string typeName = parent.GetType().Name;
string objName = parent.GetValue(FrameworkElement.NameProperty) as string;
double actualWidth = (parent.GetValue(FrameworkElement.ActualWidthProperty) as double?).GetValueOrDefault();
double actualHeight = (parent.GetValue(FrameworkElement.ActualHeightProperty) as double?).GetValueOrDefault();
writer.Indent = indentLevel;
writer.WriteLine(String.Format("[{0:000}] {1} ({2}) {3}", indentLevel,
String.IsNullOrEmpty(objName) ? typeName : objName,
typeName,
childCount)
);
foreach (object child in LogicalTreeHelper.GetChildren(parent))
{
if (child is DependencyObject)
WriteLogicalTreeRecursive(writer, (DependencyObject)child, indentLevel + 1);
}
}
用法
#if DEBUG
Debug.WriteLine("--- Start -------");
Debug.WriteLine(VisualAndLogicalTreeHelper.WriteLogicalTree(document));
Debug.WriteLine("--- End -------");
#endif
我在这里找到了这个解决方案,它帮助我完成了FlowDocment的打印而无需将其渲染到屏幕上......所以我希望它可以帮助你!
String copyString = XamlWriter.Save(flowDocViewer.Document);
FlowDocument copy = XamlReader.Parse(copyString) as FlowDocument;