使用 Wpf 的 DocumentViewer 控件时,我无法弄清如何在用户单击打印按钮时设置 DocumentViewer 显示的 PrintDialog 的 PageOrientation。有什么方法可以进行挂钩吗?
使用 Wpf 的 DocumentViewer 控件时,我无法弄清如何在用户单击打印按钮时设置 DocumentViewer 显示的 PrintDialog 的 PageOrientation。有什么方法可以进行挂钩吗?
Mike的回答可行。我选择的实现方式是创建自己的文档查看器,该查看器派生自DocumentViewer。此外,将Document属性强制转换为FixedDocument对我没有起作用-强制转换为FixedDocumentSequence有用。
GetDesiredPageOrientation可以根据您的需要进行设置。在我的情况下,我检查第一页的尺寸,因为我生成的文档具有统一的大小和方向,并且序列中仅有一个文档。
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Controls;
using System.Windows.Xps;
using System.Printing;
using System.Windows.Documents;
public class MyDocumentViewer : DocumentViewer
{
protected override void OnPrintCommand()
{
// get a print dialog, defaulted to default printer and default printer's preferences.
PrintDialog printDialog = new PrintDialog();
printDialog.PrintQueue = LocalPrintServer.GetDefaultPrintQueue();
printDialog.PrintTicket = printDialog.PrintQueue.DefaultPrintTicket;
// get a reference to the FixedDocumentSequence for the viewer.
FixedDocumentSequence docSeq = this.Document as FixedDocumentSequence;
// set the default page orientation based on the desired output.
printDialog.PrintTicket.PageOrientation = GetDesiredPageOrientation(docSeq);
if (printDialog.ShowDialog() == true)
{
// set the print ticket for the document sequence and write it to the printer.
docSeq.PrintTicket = printDialog.PrintTicket;
XpsDocumentWriter writer = PrintQueue.CreateXpsDocumentWriter(printDialog.PrintQueue);
writer.WriteAsync(docSeq, printDialog.PrintTicket);
}
}
}
我用的解决方法是通过在我的DocumentViewer打印对话框上隐藏打印按钮来设置方向,方法是从模板中省略该按钮。然后我提供了自己的打印按钮,并将其绑定到以下代码:
public bool Print()
{
PrintDialog dialog = new PrintDialog();
dialog.PrintQueue = LocalPrintServer.GetDefaultPrintQueue();
dialog.PrintTicket = dialog.PrintQueue.DefaultPrintTicket;
dialog.PrintTicket.PageOrientation = PageOrientation.Landscape;
if (dialog.ShowDialog() == true)
{
XpsDocumentWriter writer = PrintQueue.CreateXpsDocumentWriter(dialog.PrintQueue);
writer.WriteAsync(_DocumentViewer.Document as FixedDocument, dialog.PrintTicket);
return true;
}
return false;
}