c# - WPF - FlowDocument 的自动行号？

Question

我刚刚开始为我当前的项目创建契约(Contract)生成例程，其中一项要求是契约(Contract)中的每一行都必须编号。编号应位于左边距，并用垂直线将编号与文档的其余部分分开。

我很确定我可以用 FixedDocument 来满足这个要求，但它不会很有趣。无论如何，我可以用 FlowDocument 来做到这一点吗？

Answer 1

您可以使用我的 WpfPrint 帮助程序类轻松地使用 FixedDocument 执行此操作，如下所示。要将其用于 XPS 创建，只需使用 XPS 的构造函数:

WpfPrint printer = new WpfPrint(new Size(1024, 768));
printer.CurrentElementMargin = new Thickness(2, 2, 2, 2);
printer.CurrentFontFamily = new FontFamily("Arial");
printer.CurrentFontSize = BaseFontSize;
printer.MarginX = 24;
printer.MarginY = 24;

您现在可以遍历并添加您想要的任何内容； TextBlocks 很可能就是您正在寻找的:

printer.AddTextBlock("Basics", printer.PageSizeUsed.Width, 0, WpfPrint.ElementFlags.NewLine | WpfPrint.ElementFlags.BottomCheck2);

如果您将它们包裹起来，它们会自行包裹起来；添加的每个项目都经过测量。如果它不适合页面，帮助程序类会添加一个新页面并将其移动到新页面上，这样您就可以从 FlowDocument 中获得想要的内容。您可以随时更改 CurX 和 CurY 以在放置项目时跳过水平或垂直空间。完成后，您可以像这样打印到打印机:

// Print final document
XpsDocumentWriter xpsDocumentWriter = PrintQueue.CreateXpsDocumentWriter(dlg.PrintQueue);
xpsDocumentWriter.Write(printer.CurrentFixedDocument);

或者您可以另存为 XPS 文件:

using (XpsDocument doc = new XpsDocument(filename, FileAccess.Write))
{
    XpsDocumentWriter xpsDocumentWriter = XpsDocument.CreateXpsDocumentWriter(doc);
    xpsDocumentWriter.Write(printer.CurrentFixedDocument);
}

这是辅助类。享受!您再也不想使用 FlowDocument :-)

//****************************************************************************************
// WpfPrint
//
// Various helpers for printing WPF UI to a printer
//****************************************************************************************

using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Documents;
using System.Windows.Markup;
using System.Windows.Controls;
using System.Windows.Xps;
using System.Windows;
using System.Printing;
using System.Windows.Media;


namespace csheet
{
    /// <summary>
    /// Various helpers for printing WPF UI to a printer
    /// </summary>
    public class WpfPrint
    {
        #region Supporting Types
        //****************************************************************************************
        // Suporting Types
        //****************************************************************************************

        /// <summary>
        /// Element flags define the way the elements print; OR them for multiple effects
        /// </summary>
        [Flags]
        public enum ElementFlags
        {
            /// <summary>No special flags</summary>
            None = 0,

            /// <summary>Move to the next line after output</summary>
            NewLine = 1,

            /// <summary>if there isn't 2x room, then do new page first</summary>
            BottomCheck2 = 2,

            /// <summary>Center the item horizontally</summary>
            HorzCenter = 4,

            /// <summary>Right align the item (center overrides)</summary>
            HorzRight = 8
        }

        #endregion Supporting Types

        #region Data
        //****************************************************************************************
        // Data
        //****************************************************************************************

        FixedDocument _fixedDocument;
        FixedPage _curFixedPage;
        Canvas _curCanvas;
        double _marginX;
        double _marginY;
        Size _infiniteSize = new Size(double.PositiveInfinity, double.PositiveInfinity);

        #endregion Data

        #region Properties
        //****************************************************************************************
        // Properties
        //****************************************************************************************

        /// <summary>Current font family used for known objects</summary>
        public FontFamily CurrentFontFamily { get; set; }


        /// <summary>Current font size used for known objects</summary>
        public double CurrentFontSize { get; set; }


        /// <summary>Current font weight used for known objects</summary>
        public FontWeight CurrentFontWeight { get; set; }


        /// <summary>Current font style used for known objects</summary>
        public FontStyle CurrentFontStyle { get; set; }


        /// <summary>Current margin for known objects</summary>
        public Thickness CurrentElementMargin { get; set; }


        /// <summary>Current background for known objects</summary>
        public Brush CurrentElementBackground { get; set; }


        /// <summary>Current foreground for known objects</summary>
        public Brush CurrentElementForeground { get; set; }


        /// <summary>Gets the current fixed document being worked on</summary>
        public FixedDocument CurrentFixedDocument
        {
            get { return _fixedDocument; }
        }


        /// <summary>The current horizontal position</summary>
        public double CurX { get; set; }


        /// <summary>The current vertical position</summary>
        public double CurY { get; set; }


        /// <summary>The starting and ending X margins on the page</summary>
        public double MarginX
        {
            get { return _marginX; }
            set
            {
                if (value < 0)
                    value = 0;
                _marginX = value;
                if (CurX < _marginX)
                    CurX = _marginX;
            }
        }


        /// <summary>The starting and ending Y margins on the page</summary>
        public double MarginY
        {
            get { return _marginY; }
            set
            {
                if (value < 0)
                    value = 0;
                _marginY = value;
                if (CurY < _marginY)
                    CurY = _marginY;
            }
        }


        /// <summary>Gets the page size for the document minus the margins</summary>
        public Size PageSizeUsed
        {
            get
            {
                Size sz = CurrentFixedDocument.DocumentPaginator.PageSize;
                sz.Width -= 2 * _marginX;
                sz.Height -= 2 * _marginY;
                return sz;
            }
        }

        #endregion Properties

        #region Construction
        //****************************************************************************************
        // Construction
        //****************************************************************************************

        /// <summary>
        /// Constructor for printing
        /// </summary>
        /// <param name="printQueue"></param>
        /// <param name="printTicket"></param>
        public WpfPrint(PrintQueue printQueue, PrintTicket printTicket)
        {
            PrintCapabilities capabilities = printQueue.GetPrintCapabilities(printTicket);

            Size sz = new Size(capabilities.PageImageableArea.ExtentWidth, capabilities.PageImageableArea.ExtentHeight);
            _fixedDocument = new FixedDocument();
            _fixedDocument.DocumentPaginator.PageSize = sz;

            StartPage();
        }


        /// <summary>
        /// Constructor for XPS creation
        /// </summary>
        /// <param name="sz"></param>
        public WpfPrint(Size sz)
        {
            _fixedDocument = new FixedDocument();
            _fixedDocument.DocumentPaginator.PageSize = sz;

            StartPage();
        }

        #endregion Construction

        #region Interfaces
        //****************************************************************************************
        // Interfaces
        //****************************************************************************************

        /// <summary>
        /// Add a new page to the document (start a new page)
        /// </summary>
        public void StartPage()
        {
            // Create a new page content and fixed page
            PageContent content = new PageContent();
            _fixedDocument.Pages.Add(content);
            _curFixedPage = new FixedPage();
            ((IAddChild)content).AddChild(_curFixedPage);

            // Create a new drawing canvas for the page
            _curCanvas = new Canvas();
            _curCanvas.Width = _fixedDocument.DocumentPaginator.PageSize.Width;
            _curCanvas.Height = _fixedDocument.DocumentPaginator.PageSize.Height;
            _curFixedPage.Children.Add(_curCanvas);

            // Reset the current position
            CurX = MarginX;
            CurY = MarginY;
        }


        /// <summary>
        /// Adds a new element at the current position, and updates the current position
        /// </summary>
        /// <param name="element">New element to add</param>
        /// <param name="flags">Print options</param>
        public void AddUIElement(UIElement element, ElementFlags flags)
        {
            element.Measure(_infiniteSize);
            if (CurX > _fixedDocument.DocumentPaginator.PageSize.Width - MarginX)
            {
                CurY += element.DesiredSize.Height;
                CurX = MarginX;
            }
            double extraCheck = 0;
            if ((flags & ElementFlags.BottomCheck2) == ElementFlags.BottomCheck2)
                extraCheck = element.DesiredSize.Height;
            if (CurY > _fixedDocument.DocumentPaginator.PageSize.Height - MarginY - extraCheck)
                StartPage();

            _curCanvas.Children.Add(element);
            element.SetValue(Canvas.LeftProperty, CurX);
            element.SetValue(Canvas.TopProperty, CurY);

            CurX += element.DesiredSize.Width;
            if ((flags & ElementFlags.NewLine) == ElementFlags.NewLine)
            {
                CurX = MarginX;
                CurY += element.DesiredSize.Height;
            }
        }


        /// <summary>
        /// Add a current style TextBlock element at the current position
        /// </summary>
        /// <param name="text">Text to add</param>
        /// <param name="width">Width of element</param>
        /// <param name="height">Height of element</param>
        /// <param name="flags">Print options</param>
        public void AddTextBlock(string text, double width, double height, ElementFlags flags)
        {
            TextBlock tb = new TextBlock();
            tb.Text = text;
            tb.FontFamily = CurrentFontFamily;
            tb.FontSize = CurrentFontSize;
            tb.FontWeight = CurrentFontWeight;
            tb.FontStyle = CurrentFontStyle;
            tb.VerticalAlignment = VerticalAlignment.Center;
            if ((flags & ElementFlags.HorzCenter) == ElementFlags.HorzCenter)
                tb.HorizontalAlignment = HorizontalAlignment.Center;
            else if ((flags & ElementFlags.HorzRight) == ElementFlags.HorzRight)
                tb.HorizontalAlignment = HorizontalAlignment.Right;
            tb.Margin = CurrentElementMargin;
            if (CurrentElementForeground != null)
                tb.Foreground = CurrentElementForeground;
            if (CurrentElementBackground != null)
                tb.Background = CurrentElementBackground;

            Grid grid = new Grid();
            if (CurrentElementBackground != null)
                grid.Background = CurrentElementBackground;
            if (width != 0)
                grid.Width = width;
            if (height != 0)
                grid.Height = height;
            grid.Children.Add(tb);

            AddUIElement(grid, flags);
        }


        /// <summary>
        /// Adds a current style TextBox element at the current position
        /// </summary>
        /// <param name="text">Text to add</param>
        /// <param name="width">Width of element</param>
        /// <param name="height">Height of element</param>
        /// <param name="flags">Print options</param>
        public void AddTextBox(string text, double width, double height, ElementFlags flags)
        {
            TextBox tb = new TextBox();
            tb.Text = text;
            tb.FontFamily = CurrentFontFamily;
            tb.FontSize = CurrentFontSize;
            tb.FontWeight = CurrentFontWeight;
            tb.FontStyle = CurrentFontStyle;
            tb.VerticalAlignment = VerticalAlignment.Center;
            tb.VerticalContentAlignment = VerticalAlignment.Center;
            if ((flags & ElementFlags.HorzCenter) == ElementFlags.HorzCenter)
                tb.HorizontalContentAlignment = HorizontalAlignment.Center;
            else if ((flags & ElementFlags.HorzRight) == ElementFlags.HorzRight)
                tb.HorizontalContentAlignment = HorizontalAlignment.Right;
            tb.Margin = CurrentElementMargin;
            if (CurrentElementBackground != null)
                tb.Background = CurrentElementBackground;
            if (CurrentElementForeground != null)
                tb.Foreground = CurrentElementForeground;

            Grid grid = new Grid();
            if (CurrentElementBackground != null)
                grid.Background = CurrentElementBackground;
            if (width != 0)
                grid.Width = width;
            if (height != 0)
                grid.Height = height;
            grid.Children.Add(tb);

            AddUIElement(grid, flags);
        }


        /// <summary>
        /// Add a current style CheckBox element at the current position
        /// </summary>
        /// <param name="value">Checkbox value to add</param>
        /// <param name="width">Width of element</param>
        /// <param name="height">Height of element</param>
        /// <param name="flags">Print options</param>
        public void AddCheckBox(bool value, double width, double height, ElementFlags flags)
        {
            CheckBox cb = new CheckBox();
            cb.IsChecked = value;
            cb.VerticalAlignment = VerticalAlignment.Center;
            if ((flags & ElementFlags.HorzCenter) == ElementFlags.HorzCenter)
                cb.HorizontalAlignment = HorizontalAlignment.Center;
            else if ((flags & ElementFlags.HorzRight) == ElementFlags.HorzRight)
                cb.HorizontalAlignment = HorizontalAlignment.Right;
            if (CurrentElementForeground != null)
                cb.Foreground = CurrentElementForeground;
            if (CurrentElementBackground != null)
                cb.Background = CurrentElementBackground;

            Grid grid = new Grid();
            if (CurrentElementBackground != null)
                grid.Background = CurrentElementBackground;
            if (width != 0)
                grid.Width = width;
            if (height != 0)
                grid.Height = height;
            grid.Children.Add(cb);

            AddUIElement(grid, flags);
        }

        #endregion Interfaces
    }
}