DocumentViewer覆盖打印按钮

Question

我已经使用自定义DocumentViewer在我的应用程序中实现了打印预览功能(如下所示)。在显示预览之前，我调用PrintDialog.ShowDialog()，以便根据纸张的方向正确创建文档。

但是，DocumentViewer打印按钮调用PrintDialog.ShowDialog()，提示用户再次选择打印机和选项(他们在预览窗口打开之前已经选择了)。

是否有一种方法可以让DocumentViewer打印按钮直接打印而不调用PrintDialog.ShowDialog()

下面是我的方法调用：

ReportViewModel.cs

    public void PrintButtonClick(DataGrid dataGrid)
    {
        PrintDialog printDialog = new PrintDialog();
        if (printDialog.ShowDialog() == false)
            return;

        // Get page size based on print dialog printable area (orientation)
        Size pageSize = new Size(printDialog.PrintableAreaWidth, printDialog.PrintableAreaHeight);

        // create new paginator for datagrid
        DataGridDocumentPaginator paginator = new DataGridDocumentPaginator(dataGrid as DataGrid, "Employer Match Report", pageSize, new Thickness(30, 20, 30, 20));
        ...
    }

我是这样做的，这样我就可以正确地生成带有肖像或景观大小值的分页器。否则，DocumentViewer中的预览文档可能无法根据所选择的方向正确显示。

PrintDocumentViewer : DocumentViewer

   protected override void OnPrintCommand()
   {
       PrintDialog printDialog = new PrintDialog();
       printDialog.PrintQueue = LocalPrintServer.GetDefaultPrintQueue();
       printDialog.PrintTicket = printDialog.PrintQueue.DefaultPrintTicket;

       printDialog.PrintTicket.PageOrientation = PageOrientation;
       // Code assumes this.Document will either by a FixedDocument or a FixedDocumentSequence
       FixedDocument fixedDocument = this.Document as FixedDocument;
       FixedDocumentSequence fixedDocumentSequence = this.Document as FixedDocumentSequence;

       if (fixedDocument != null)
           fixedDocument.PrintTicket = printDialog.PrintTicket;

       if (fixedDocumentSequence != null)
           fixedDocumentSequence.PrintTicket = printDialog.PrintTicket;

       XpsDocumentWriter writer = PrintQueue.CreateXpsDocumentWriter(printDialog.PrintQueue);

       if (fixedDocument != null)
           writer.WriteAsync(fixedDocument, printDialog.PrintTicket);

       if (fixedDocumentSequence != null)
           writer.WriteAsync(fixedDocumentSequence, printDialog.PrintTicket);

       // Create Preview Window and show preview
       string s = _previewWindowXaml;
       using (var reader = new System.Xml.XmlTextReader(new StringReader(s)))
       {
           Window preview = System.Windows.Markup.XamlReader.Load(reader) as Window;

           DocumentViewer _docViewer = LogicalTreeHelper.FindLogicalNode(preview, "PrintDocumentViewer") as DocumentViewer;
           _docViewer.Document = (fixedDocument != null) ? fixedDocument as IDocumentPaginatorSource : fixedDocumentSequence as IDocumentPaginatorSource;

           // hide the search bar in the PrintPreview dialog
           ContentControl cc = _docViewer.Template.FindName("PART_FindToolBarHost", _docViewer) as ContentControl;
           cc.Visibility = Visibility.Collapsed;

           preview.ShowDialog();
       }
   }

Answer 1

您可以填充打印机和纸张大小属性，然后不显示对话框。

var pd = new PrintDialog();
pd.PrintTicket.PageMediaSize = new PageMediaSize(PageMediaSizeName.NorthAmericaLetter, 816.0, 1056.0);
pd.PrintQueue = new LocalPrintServer().GetPrintQueue("Microsoft Print to PDF");

要重写Print命令，请执行以下操作：

<DocumentViewer>
    <DocumentViewer.CommandBindings>
        <CommandBinding Command="ApplicationCommands.Print" Executed="Print_Executed" />
    </DocumentViewer.CommandBindings>
</DocumentViewer>

Answer 2

打印按钮很难被覆盖，但我找到了一种方法。即使它可能被认为是一种肮脏的黑客行为，最终重要的还是结果。

我只是用一个不可见的按钮覆盖了打印按钮(反正这是第一个按钮)，该按钮将单击重定向到我自己的打印函数。在本示例代码中，搜索工具栏也被隐藏，Ctrl+P被禁用：

<Grid>
    <DocumentViewer x:Name="DocumentViewer">
        <DocumentViewer.Resources>
            <Style TargetType="ContentControl">
                <Style.Triggers>
                    <Trigger Property="Name" Value="PART_FindToolBarHost">
                        <Setter Property="Visibility" Value="Collapsed" />
                    </Trigger>
                </Style.Triggers>
            </Style>
        </DocumentViewer.Resources>
        <DocumentViewer.InputBindings>
            <KeyBinding Key="P" Modifiers="Control" Command="ApplicationCommands.NotACommand" />
        </DocumentViewer.InputBindings>
    </DocumentViewer>
    <Button Width="32" Height="32" VerticalAlignment="Top" HorizontalAlignment="Left" Opacity="0.01" Click="OnPrint" ></Button>
</Grid>

Answer 3

我希望您到目前为止已经解决了这个问题，但是您可以将这个问题作为修改DocumentViewer控件模板的基础：

How do you hide a WPF DocumentViewer's menu bars?

有一个指向MSDN文章的链接，它应该向您展示如何修改模板，以便“打印”按钮可以执行您想要的操作，而不是默认的打印操作。