我的各种WPF应用程序显示FlowDocument。我可以使用打印 WPF FlowDocument的答案中描述的方法来打印它们。
现在我想添加“打印预览”功能。在正常情况下,我正在打印窗口中显示的 FlowDocument,因此我不需要打印预览。但在某些情况下,要打印的 FlowDocument 是在内存中动态构建的。在这些情况下,我想在打印之前显示它。
现在,我当然可以弹出一个新窗口并显示 FlowDocument,但是
我希望预览真正感觉就像它是打印操作的一部分,而不仅仅是应用程序中的另一个窗口。
我不想在 FlowDocumentScrollViewer 中使用普通的 FlowDocument。它不是“任何尺寸”,而是需要受到纸张尺寸、特定高宽比和分页的限制。
建议?
我应该只使用标准窗口吗?在这种情况下,如何确保 FlowDocument 处于正确的比例?
是否有一种更“集成”的方法可以在属于 Windows 的 PrintDialog UI 范围内进行预览?
谢谢
根据添加到我的问题的评论中的提示,我这样做了:
private string _previewWindowXaml =
@"<Window
xmlns ='http://schemas.microsoft.com/netfx/2007/xaml/presentation'
xmlns:x ='http://schemas.microsoft.com/winfx/2006/xaml'
Title ='Print Preview - @@TITLE'
Height ='200'
Width ='300'
WindowStartupLocation ='CenterOwner'>
<DocumentViewer Name='dv1'/>
</Window>";
internal void DoPreview(string title)
{
string fileName = System.IO.Path.GetRandomFileName();
FlowDocumentScrollViewer visual = (FlowDocumentScrollViewer)(_parent.FindName("fdsv1"));
try
{
// write the XPS document
using (XpsDocument doc = new XpsDocument(fileName, FileAccess.ReadWrite))
{
XpsDocumentWriter writer = XpsDocument.CreateXpsDocumentWriter(doc);
writer.Write(visual);
}
// Read the XPS document into a dynamically generated
// preview Window
using (XpsDocument doc = new XpsDocument(fileName, FileAccess.Read))
{
FixedDocumentSequence fds = doc.GetFixedDocumentSequence();
string s = _previewWindowXaml;
s = s.Replace("@@TITLE", title.Replace("'", "'"));
using (var reader = new System.Xml.XmlTextReader(new StringReader(s)))
{
Window preview = System.Windows.Markup.XamlReader.Load(reader) as Window;
DocumentViewer dv1 = LogicalTreeHelper.FindLogicalNode(preview, "dv1") as DocumentViewer;
dv1.Document = fds as IDocumentPaginatorSource;
preview.ShowDialog();
}
}
}
finally
{
if (File.Exists(fileName))
{
try
{
File.Delete(fileName);
}
catch
{
}
}
}
}
它的作用:它实际上将视觉内容打印到 XPS 文档中。然后,它加载“打印的”XPS 文档,并将其显示在一个非常简单的 XAML 文件中,该文件存储为字符串,而不是作为单独的模块,并在运行时动态加载。生成的窗口具有 DocumentViewer 按钮:打印、调整到最大页面宽度等。
我还添加了一些代码来隐藏搜索框。请参阅 此答案对 WPF:如何删除 DocumentViewer 中的搜索框? 了解我是如何做到这一点的。
效果是这样的:
XpsDocument 可以在 ReachFramework dll 中找到,XpsDocumentWriter 可以在 System.Printing dll 中找到,两者都必须添加为项目的引用
“FlowDocumentPageViewer”控件是我们项目之一中使用的“预览”控件的基础。以下是“DocumentPreviewer”控件的 XAML(对于长度,XAML 不够简洁表示歉意):
<Control
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:sys="clr-namespace:System;assembly=mscorlib"
xmlns:l="clr-namespace:Tyler.ComPort.UI"
mc:Ignorable="d"
x:Class="Tyler.ComPort.UI.DocumentPreviewer"
x:Name="UserControl"
Background="Gray"
d:DesignWidth="640" d:DesignHeight="480">
<Control.Resources>
<ObjectDataProvider x:Key="ViewStyles" MethodName="GetValues" ObjectType="{x:Type sys:Enum}" >
<ObjectDataProvider.MethodParameters>
<x:Type TypeName="l:ViewType" />
</ObjectDataProvider.MethodParameters>
</ObjectDataProvider>
<l:EnumMatchVisibilityConverter x:Key="EnumVisibilityConverter" />
</Control.Resources>
<Control.Template>
<ControlTemplate>
<ControlTemplate.Triggers>
<Trigger Property="l:DocumentPreviewer.ViewType">
<Trigger.Value>
<l:ViewType>Actual</l:ViewType>
</Trigger.Value>
<Trigger.Setters>
<Setter TargetName="ScrollViewer" Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Auto" />
<Setter TargetName="ScrollViewer" Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />
<Setter TargetName="Viewbox" Property="Viewbox.Stretch" Value="None" />
</Trigger.Setters>
</Trigger>
<Trigger Property="l:DocumentPreviewer.ViewType">
<Trigger.Value>
<l:ViewType>Fit</l:ViewType>
</Trigger.Value>
<Trigger.Setters>
<Setter TargetName="ScrollViewer" Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled" />
<Setter TargetName="ScrollViewer" Property="ScrollViewer.VerticalScrollBarVisibility" Value="Disabled" />
<Setter TargetName="Viewbox" Property="Viewbox.Stretch" Value="Uniform" />
</Trigger.Setters>
</Trigger>
<Trigger Property="l:DocumentPreviewer.ViewType">
<Trigger.Value>
<l:ViewType>Wide</l:ViewType>
</Trigger.Value>
<Trigger.Setters>
<Setter TargetName="ScrollViewer" Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled" />
<Setter TargetName="ScrollViewer" Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto" />
<Setter TargetName="Viewbox" Property="Viewbox.Stretch" Value="UniformToFill" />
</Trigger.Setters>
</Trigger>
</ControlTemplate.Triggers>
<DockPanel>
<ToolBar DockPanel.Dock="Top">
<Button Command="{x:Static ApplicationCommands.Print}" CommandTarget="{Binding ElementName=PageViewer}" Content="Print..." />
<Separator />
<Button Command="{x:Static NavigationCommands.PreviousPage}" CommandTarget="{Binding ElementName=PageViewer}" Content="< Previous" />
<Button Command="{x:Static NavigationCommands.NextPage}" CommandTarget="{Binding ElementName=PageViewer}" Content="Next >" />
<Separator />
<l:ToolBarButtonGroup
ItemsSource="{Binding Source={StaticResource ViewStyles}}"
SelectedItem="{Binding ViewType, ElementName=UserControl}"
IsSynchronizedWithCurrentItem="True"
>
<l:ToolBarButtonGroup.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" ToolTip="{Binding}" SnapsToDevicePixels="True">
<Image Source="../Images/actual.png" Visibility="{Binding Converter={StaticResource EnumVisibilityConverter}, ConverterParameter=Actual}" />
<Image Source="../Images/fit.png" Visibility="{Binding Converter={StaticResource EnumVisibilityConverter}, ConverterParameter=Fit}" />
<Image Source="../Images/wide.png" Visibility="{Binding Converter={StaticResource EnumVisibilityConverter}, ConverterParameter=Wide}" />
</StackPanel>
</DataTemplate>
</l:ToolBarButtonGroup.ItemTemplate>
</l:ToolBarButtonGroup>
</ToolBar>
<ScrollViewer x:Name="ScrollViewer" HorizontalScrollBarVisibility="Disabled" VerticalScrollBarVisibility="Disabled">
<Border
BorderBrush="Black"
BorderThickness="1"
HorizontalAlignment="Center"
VerticalAlignment="Top"
Background="White"
Margin="10">
<Viewbox x:Name="Viewbox" Stretch="Uniform">
<FlowDocumentPageViewer
x:Name="PageViewer"
Document="{Binding Document, ElementName=UserControl}"
Zoom="100"
MinZoom="20"
MaxZoom="200">
<FlowDocumentPageViewer.Template>
<ControlTemplate TargetType="{x:Type FlowDocumentPageViewer}">
<AdornerDecorator>
<DocumentPageView FlowDocumentPageViewer.IsMasterPage="True" />
</AdornerDecorator>
</ControlTemplate>
</FlowDocumentPageViewer.Template>
</FlowDocumentPageViewer>
</Viewbox>
</Border>
</ScrollViewer>
</DockPanel>
</ControlTemplate>
</Control.Template>
</Control>
当然,您可以在哪里放置此类控件取决于您(和您的应用程序),但我们的应用程序具有与典型 Office 应用程序类似的行为,您可以直接打印或预览(显示上述界面)并从在那里。