网上一个关于支持打印的ListView类代码的一点改动

来源：互联网发布：招聘美工图片编辑：程序博客网时间：2024/05/16 12:36
在该程序中，因为每次在预览后的打印是要重新填充那块“画布”的，

所以在private void EndPrint(object sender, PrintEventArgs e)处理中要重新初始化一些变量

整体代码如下（只对支持预览的改动，其他若有问题，请高手指点）
/* -----------------------------------------------------------------------------------------
 * 【文件名】： PrintListView.cs
 * 【说  明】： 支持 ListView 的所见即所得的打印的类
 *            1、整个打印的部分分为页首、正文、页尾三个部分；
 *            2、正文部分打印 ListView 的 ColumnHeader 以及 ListView 的 Items，通过 PrintPageBody() 实现；
 *            3、页首、页尾的打印自由定制，默认的行为是页首打印标题，页尾打印页码和时间，需要改变页首和
 *            页尾的默认打印方式，可以对 PrintPageHeader() 和 PrintPageTail() 函数进行重写，并进行打印区域
 *            的重新计算；
 *            4、支持预览
 *            5、支持打印设置，如：是否每页都打印标题，设置页首、正文、页尾的打印字体，等。
 *            
 * 【作  者】： sashow ( sashow @ 163.com )
 * 【日  期】： 2005.05.10
 * ----------------------------------------------------------------------------------------*/
using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;
using System.Drawing.Printing;
namespace ForCustoms
{
    /// <summary>
    /// ListView 的所见即所得的打印支持类。
    /// </summary>
    public class PrintListView : ListView
    {
        /// <summary>
        /// 指示是否进行打印预览，默认值为 true
        /// </summary>
        private bool m_bIsPreview;
        /// <summary>
        /// 指示是否总是打印标题，默认值为 true
        /// </summary>
        private bool m_bIsAlwaysPrintHeader;
        /// <summary>
        /// 需要打印的页首字符串
        /// </summary>
        private string m_sPrintHeaderString;
        /// <summary>
        /// 页首字体
        /// </summary>
        private Font m_oHeaderFont;
        /// <summary>
        /// 正文字体
        /// </summary>
        private Font m_oBodyFont;
        /// <summary>
        /// 页尾字体
        /// </summary>
        private Font m_oTailFont;
        /// <summary>
        /// 正文部分的 ColumnHeader 字体，该字体为正文字体的加粗形式
        /// </summary>
        private Font m_oColumnHeaderFont;
        /// <summary>
        /// 打印文档
        /// </summary>
        private PrintDocument m_oPrintDoc;
        /// <summary>
        /// 行间距
        /// </summary>
        private int m_nLineSpace;
        private int m_nFromPageSave;
        private int m_nPrintWidth;            // 打印区域宽度
        private int m_nPrintHeight;            // 打印区域长度
        private int m_nPageCount;            // 打印页数
        private int m_nCurPrintPage;         // 当前正在打印的页码
        private int m_nTotalPage;            // 共有的页数
        private int m_nFromPage;            // 用户选择的打印起始页
        private int m_nCurPrintItem;         // 当前正在打印的元素
        private Rectangle m_oHeaderRect;      // 打印页首的区域
        private Rectangle m_oBodyRect;         // 打印正文的区域
        private Rectangle m_oTailRect;         // 打印页尾的区域
        private Brush defaultBrush;
        private Pen defaultPen;
        int listViewWidth;
        /// <summary>
        /// 设置或获取是否进行打印预览
        /// </summary>
        public bool IsPreview
        {
            get { return m_bIsPreview; }
            set { m_bIsPreview = value; }
        }
        /// <summary>
        /// 设置或获取是否总是打印标题
        /// </summary>
        public bool IsAlwaysPrintHeader
        {
            get { return m_bIsAlwaysPrintHeader; }
            set { m_bIsAlwaysPrintHeader = value; }
        }
        /// <summary>
        /// 设置或获取打印的页首字符串
        /// </summary>
        public string PrintHeaderString
        {
            get { return m_sPrintHeaderString; }
            set { if (value != null) m_sPrintHeaderString = value; }
        }
        /// <summary>
        /// 设置或获取页首字体
        /// </summary>
        public Font HeaderFont
        {
            set { m_oHeaderFont = value; }
            get { return m_oHeaderFont; }
        }
        /// <summary>
        /// 设置或获取正文字体
        /// 如果对正文字体的 Bold 属性设置为 true ，则发生 Exception 类型的异常
        /// </summary>
        public Font BodyFont
        {
            set
            {
                if (value == null)
                    return;
                if (value.Bold == true)
                {
                    throw new Exception("正文字体不能进行 [加粗] 设置.");
                }
                else
                {
                    m_oBodyFont = value;
                }
            }
            get { return m_oBodyFont; }
        }
        /// <summary>
        /// 设置或获取页尾字体
        /// </summary>
        public Font TailFont
        {
            set { m_oTailFont = value; }
            get { return m_oTailFont; }
        }
        /// <summary>
        /// 设置或获取行间距
        /// </summary>
        public int LineSpace
        {
            get { return m_nLineSpace; }
            set
            {
                if (value < 0)
                {
                    m_nLineSpace = 0;
                }
                m_nLineSpace = value;
            }
        }
        /// <summary>
        /// 构造函数，设置打印信息的一些默认值
        /// </summary>
        public PrintListView()
        {
            m_bIsPreview = true;
            m_bIsAlwaysPrintHeader = true;
            m_sPrintHeaderString = "";
            m_oHeaderFont = null;
            m_oTailFont = null;
            m_oBodyFont = null;
            m_oColumnHeaderFont = null;
            m_oPrintDoc = null;
            m_nPrintWidth = 0;
            m_nPrintHeight = 0;
            m_nPageCount = 0;
            m_nCurPrintPage = 1;
            m_nFromPage = 1;
            m_nLineSpace = 0;
            m_nCurPrintItem = 0;
            defaultBrush = Brushes.Black;
            defaultPen = new Pen(defaultBrush, 1);
        }
        /// <summary>
        /// 初始化打印文档的属性
        /// </summary>
        /// <returns></returns>
        private void InitPrintDocument()
        {
            m_oPrintDoc = new PrintDocument();
            m_oPrintDoc.DocumentName = m_sPrintHeaderString;
            if (m_oPrintDoc.PrinterSettings.PrinterName == "<no default printer>")
            {
                throw new Exception("未找到默认打印机.");
            }
            else
            {
                m_oPrintDoc.PrintPage += new PrintPageEventHandler(PrintPage);
                m_oPrintDoc.BeginPrint += new PrintEventHandler(BeginPrint);
                m_oPrintDoc.EndPrint += new PrintEventHandler(EndPrint);
            }
            /* 设置打印字体 */
            if (m_oHeaderFont == null)
            {
                m_oHeaderFont = new Font("楷体_GB2312", 24, FontStyle.Bold, GraphicsUnit.World);
            }
            if (m_oBodyFont == null)
            {
                m_oBodyFont = new Font("楷体_GB2312", 18, FontStyle.Regular, GraphicsUnit.World);
            }
            m_oColumnHeaderFont = new Font(m_oBodyFont, FontStyle.Bold);
            if (m_oTailFont == null)
            {
                m_oTailFont = new Font("楷体_GB2312", 12, FontStyle.Regular, GraphicsUnit.World);
            }
        }
        /// <summary>
        /// 初始化打印纸张设置
        /// </summary>
        private bool InitPrintPage(out Margins margins)
        {
            margins = null;
            /* 获取当前 listview 的分辨率 */
            Graphics g = this.CreateGraphics();
            float x = g.DpiX;
            g.Dispose();
            /* 显示纸张设置对话框 */
            PageSetupDialog ps = new PageSetupDialog();
            ps.Document = m_oPrintDoc;
            if (ps.ShowDialog() == DialogResult.Cancel)
            {
                return false;
            }
            else
            {               // 根据用户设置的纸张信息计算打印区域，计算结果的单位为 1/100 Inch
                m_nPrintWidth = ps.PageSettings.Bounds.Width - ps.PageSettings.Margins.Left - ps.PageSettings.Margins.Right;
                m_nPrintHeight = ps.PageSettings.Bounds.Height - ps.PageSettings.Margins.Top - ps.PageSettings.Margins.Bottom;
                margins = ps.PageSettings.Margins;
            }
            if (m_nPrintWidth <= 0 || m_nPrintHeight <= 0)
            {
                throw new Exception("纸张设置错误.");
            }
            /* 将当前 listview 的各column的长度和转换为英寸，判断打印范围是否越界 */
            listViewWidth = 0;
            for (int i = 0; i < this.Columns.Count; i++)
            {
                listViewWidth += this.Columns[i].Width;
            }
            if (Convert.ToInt32(listViewWidth / x * 100) > m_nPrintWidth)
            {
                throw new Exception("打印内容超出纸张范围 ！/r/n请尝试调整纸张或纸张边距；/r/n或缩小表格各列的宽度。");
            }
            m_oPrintDoc.DefaultPageSettings = ps.PageSettings;
            return true;
        }
        /// <summary>
        /// 初始化打印页码设置
        /// </summary>
        private bool InitPrintPageNumber(Margins margins)
        {
            /* 计算页数 */
            int headerFontHeight = m_oHeaderFont.Height;
            int columnHeaderFontHeight = m_oColumnHeaderFont.Height;
            int bodyFontHeight = m_oBodyFont.Height;
            int tailFontHeight = m_oTailFont.Height;
            // 页首区域打印 页首字符串 以及一条横线
            m_oHeaderRect = new Rectangle(margins.Left, margins.Top, m_nPrintWidth, headerFontHeight + m_nLineSpace + 3);
            int tailHeight = tailFontHeight + m_nLineSpace + 3;
            // 页尾区域打印 一条横线，页码和打印时间（在同一行）
            m_oTailRect = new Rectangle(margins.Left, margins.Top + m_nPrintHeight - tailHeight, m_nPrintWidth, tailHeight);
            //正文区域为去掉页首和页尾区域的部分
            m_oBodyRect = new Rectangle(margins.Left + (m_nPrintWidth - listViewWidth) / 2, m_oHeaderRect.Bottom + 2, m_nPrintWidth, m_oTailRect.Top - m_oHeaderRect.Bottom - 4);
            /* 计算第一页能打印的元素个数 */
            int printItemPerPage = 0;
            int firstPageItem = Convert.ToInt32((m_oBodyRect.Height - columnHeaderFontHeight - m_nLineSpace) / (bodyFontHeight + m_nLineSpace));
            if (firstPageItem >= this.Items.Count)
            {   // 需打印的元素只有一页
                m_nPageCount = 1;
            }
            else
            {                              
                // 需要打印的元素有多页
                printItemPerPage = firstPageItem;
                int leftItems = this.Items.Count - firstPageItem;
                if (m_bIsAlwaysPrintHeader == false)
                {
                    printItemPerPage = (m_oBodyRect.Height + m_oHeaderRect.Height + 2 - columnHeaderFontHeight - m_nLineSpace) / (bodyFontHeight + m_nLineSpace);
                }
                if (leftItems % printItemPerPage == 0)
                {
                    m_nPageCount = leftItems / printItemPerPage + 1;
                }
                else
                {
                    m_nPageCount = leftItems / printItemPerPage + 2;
                }
            }
            m_nTotalPage = m_nPageCount;
            /* 显示打印对话框 */
            PrintDialog pd = new PrintDialog();
            pd.Document = m_oPrintDoc;
            pd.PrinterSettings.MinimumPage = 1;
            pd.PrinterSettings.MaximumPage = m_nPageCount;
            pd.PrinterSettings.FromPage = 1;
            pd.PrinterSettings.ToPage = m_nPageCount;
            pd.AllowPrintToFile = false;      // 不设置打印到文件
            if (m_nPageCount > 1)
            {
                pd.AllowSelection = true;
            }
            else
            {
                pd.AllowSelection = false;
            }
            pd.AllowSomePages = true;
            if (pd.ShowDialog() == DialogResult.OK)
            {
                m_nPageCount = pd.PrinterSettings.ToPage - pd.PrinterSettings.FromPage + 1;
                if (pd.PrinterSettings.FromPage > 1)
                {
                    m_nCurPrintItem = firstPageItem + (pd.PrinterSettings.FromPage - 2) * printItemPerPage;
                }
                else
                {
                    m_nCurPrintItem = 0;
                }
                m_nFromPage = pd.PrinterSettings.FromPage;
                m_nFromPageSave = m_nFromPage;
                m_oPrintDoc.DocumentName = m_nPageCount.ToString();
                m_oPrintDoc.PrinterSettings = pd.PrinterSettings;
                return true;
            }
            else
            {
                return false;
            }
        }
        /// <summary>
        /// 启动 ListView 的打印工作
        /// </summary>
        public virtual void DoPrint()
        {
            if (this.Items.Count <= 0)
            {
                throw new Exception("没有需要打印的元素.");
            }
            InitPrintDocument();
            Margins margins = null;
            if (InitPrintPage(out margins) == false)
                return;
            if (InitPrintPageNumber(margins) == false)
                return;
            if (m_bIsPreview == false)
            {
                m_oPrintDoc.Print();
            }
            else
            {
                PrintPreviewDialog pd = new PrintPreviewDialog();
                pd.Document = m_oPrintDoc;
                pd.PrintPreviewControl.Zoom = 1.0;
                pd.WindowState = FormWindowState.Maximized;
                pd.ShowInTaskbar = true;
                pd.ShowDialog();
            }
        }
        /// <summary>
        /// 打印页首
        /// </summary>
        /// <param name="g"></param>
        protected virtual void PrintPageHeader(Graphics g)
        {
            RectangleF textRect = new RectangleF(m_oHeaderRect.X, m_oHeaderRect.Y, m_oHeaderRect.Width, m_oHeaderRect.Height - 3);
            CenterText(g, m_sPrintHeaderString, m_oHeaderFont, defaultBrush, textRect);
            g.DrawLine(defaultPen, m_oHeaderRect.X, m_oHeaderRect.Bottom - 2, m_oHeaderRect.Right, m_oHeaderRect.Bottom - 2);
        }
        /// <summary>
        /// 打印正文
        /// </summary>
        /// <param name="g"></param>
        protected virtual void PrintPageBody(Graphics g)
        {
            Rectangle textRect = m_oBodyRect;
            if (m_bIsAlwaysPrintHeader == false && m_nCurPrintPage != 1)
            {
                textRect = new Rectangle(m_oHeaderRect.X, m_oHeaderRect.Y, m_oHeaderRect.Width, m_oHeaderRect.Height + 2 + m_oBodyRect.Height);
            }
            /* 打印标题,也就是 columnHeader */
            int columnHeaderFontHeight = m_oColumnHeaderFont.Height;
            int bodyFontHeight = m_oBodyFont.Height;
            Rectangle columnHeaderRect = new Rectangle(textRect.X, textRect.Y, textRect.Width, columnHeaderFontHeight + m_nLineSpace);
            PrintColumnHeader(g, m_oColumnHeaderFont, defaultBrush, columnHeaderRect);
            /* 打印元素 */
            int itemHeight = bodyFontHeight + m_nLineSpace;
            Rectangle itemRect;
            int yPos = columnHeaderRect.Bottom;
            int printItemPerPage = (textRect.Height - columnHeaderRect.Height) / (bodyFontHeight + m_nLineSpace);
            for (int i = 0; (i < printItemPerPage) && (m_nCurPrintItem < this.Items.Count); i++)
            {
                itemRect = new Rectangle(textRect.X, yPos, textRect.Width, itemHeight);
                PrintItem(g, m_oBodyFont, defaultBrush, itemRect);
                m_nCurPrintItem++;
                yPos += itemHeight;
            }
        }
        /// <summary>
        /// 打印页尾
        /// </summary>
        /// <param name="g"></param>
        protected virtual void PrintPageTail(Graphics g)
        {
            g.DrawLine(defaultPen, m_oTailRect.X, m_oTailRect.Top + 1, m_oTailRect.Right, m_oTailRect.Top + 1);
            RectangleF textRect = new RectangleF(m_oTailRect.X, m_oTailRect.Y + 3, m_oTailRect.Width, m_oTailRect.Height - 3);
            string text = "第 " + m_nFromPage.ToString() + " 页  共 " + m_nTotalPage.ToString() + " 页";
            m_nFromPage++;
            CenterText(g, text, m_oTailFont, defaultBrush, textRect);
            string time = "打印时间：" + DateTime.Now.ToLongDateString() + "   ";
            RightText(g, time, m_oTailFont, defaultBrush, textRect);
        }
        /// <summary>
        /// 打印一页
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void PrintPage(object sender, PrintPageEventArgs e)
        {
            e.Graphics.PageUnit = GraphicsUnit.Inch;
            e.Graphics.PageScale = .01f;
            if (m_bIsAlwaysPrintHeader == true)
            {
                PrintPageHeader(e.Graphics);
            }
            else
            {
                if (m_nCurPrintPage == 1)
                {
                    PrintPageHeader(e.Graphics);
                }
            }
            PrintPageBody(e.Graphics);
            PrintPageTail(e.Graphics);
            if (m_nCurPrintPage == m_nPageCount)
            {
                e.HasMorePages = false;
            }
            else
            {
                e.HasMorePages = true;
            }
            m_nCurPrintPage++;
        }
        /// <summary>
        /// 打印前的初始化设置
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void BeginPrint(object sender, PrintEventArgs e)
        {
            m_nCurPrintPage = 1;
        }
        /// <summary>
        /// 打印结束后的资源释放
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void EndPrint(object sender, PrintEventArgs e)
        {
            m_nCurPrintItem = 0;
            m_nFromPage = m_nFromPageSave;
        }
        /// <summary>
        /// 居中显示文本信息
        /// </summary>
        private void CenterText(Graphics g, string t, Font f, Brush b, RectangleF rect)
        {
            StringFormat sf = new StringFormat();
            sf.Alignment = StringAlignment.Center;
            sf.LineAlignment = StringAlignment.Center;
            g.DrawString(t, f, b, rect, sf);
        }
        /// <summary>
        /// 居右显示文本信息
        /// </summary>
        private void RightText(Graphics g, string t, Font f, Brush b, RectangleF rect)
        {
            StringFormat sf = new StringFormat();
            sf.Alignment = StringAlignment.Far;
            sf.LineAlignment = StringAlignment.Center;
            g.DrawString(t, f, b, rect, sf);
        }
        /// <summary>
        /// 居左显示文本信息
        /// </summary>
        private void LeftText(Graphics g, string t, Font f, Brush b, RectangleF rect)
        {
            StringFormat sf = new StringFormat();
            sf.Alignment = StringAlignment.Near;
            sf.LineAlignment = StringAlignment.Center;
            g.DrawString(t, f, b, rect, sf);
        }
        /// <summary>
        /// 打印 listview 的 columnheader
        /// </summary>
        private void PrintColumnHeader(Graphics g, Font f, Brush b, Rectangle rect)
        {
            StringFormat sf = new StringFormat();
            sf.Alignment = StringAlignment.Center;
            sf.LineAlignment = StringAlignment.Center;
            Rectangle itemRect;
            Point location = new Point(rect.Location.X, rect.Location.Y);
            Size itemSize;
            for (int i = 0; i < this.Columns.Count; i++)
            {
                itemSize = new Size(this.Columns[i].Width, rect.Height);
                itemRect = new Rectangle(location, itemSize);
                g.DrawRectangle(defaultPen, itemRect);
                g.DrawString(this.Columns[i].Text, f, b, itemRect, sf);
                location.X += this.Columns[i].Width;
            }
        }
        /// <summary>
        /// 打印 listview 的 item
        /// </summary>
        private void PrintItem(Graphics g, Font f, Brush b, Rectangle rect)
        {
            StringFormat sf = new StringFormat();
            sf.Alignment = StringAlignment.Near;
            sf.LineAlignment = StringAlignment.Center;
            Rectangle itemRect;
            Point location = new Point(rect.Location.X, rect.Location.Y);
            Size itemSize;
            for (int i = 0; i < this.Columns.Count; i++)
            {
                itemSize = new Size(this.Columns[i].Width, rect.Height);
                itemRect = new Rectangle(location, itemSize);
                g.DrawRectangle(defaultPen, itemRect);
                g.DrawString(this.Items[m_nCurPrintItem].SubItems[i].Text, f, b, itemRect, sf);
                location.X += this.Columns[i].Width;
            }
        }
    }
}
最后感谢原著