DataGrid 打印类 V1.0b

nashcontrol

4.16/5 (19投票s)

2004年9月20日

278858

2567

一个 DataGrid 打印类。

下载演示项目 - 62.5 Kb

UML 设计

Sample Image

预览

Sample Image

引言

DataGrid 控制是使用起来最糟糕的控件之一，但又非常需要。这个控件的真正问题在于打印网格。这个类支持从右到左的打印、彩色和对齐的网格打印...

背景

我需要做一个支持从右到左网格打印的项目，但我找到的所有打印类都无法胜任。所以，我创建了一个新的...

实现

主类是 PrinterClass，它执行实际的打印。Grid 是一个保存 DataGrid 数据的类，它由单元格和标题组成。Cell 代表网格中的单个单元格，包含位置、字体对齐等。Header 代表单个标题单元格（继承自 Cell）。

使用代码

网格创建

public Grid(DataGrid TheGrid)
{
    try
    {
        //get the Data in the grid
        DataTable TableGrid = (DataTable)TheGrid.DataSource;

        //set number of rows
        rows = TableGrid.Rows.Count;

        //set number of columns
        //first check if the grid has tablestyle and columnstyle

        CreateColumnStyles(TheGrid,TableGrid);

        if (TheGrid.TableStyles[TableGrid.TableName].GridColumnStyles.Count>0)
            columns = 
              TheGrid.TableStyles[TableGrid.TableName].GridColumnStyles.Count;

        //init number of columns to headers
        Headers = new Header[Columns];

        SetHeaders(TheGrid,TableGrid);

        Cells = new Cell[Rows,Columns];

        //Copy Cells
        for (int i=0;i<Rows;i++)
        {
            for (int j=0;j<Columns;j++)
            {
                Cells[i,j] = new Cell(i, j, TheGrid.Font, 
                   TheGrid.GetCellBounds(i,j), TheGrid[i,j].ToString());
            }
        }

        //define grid colors
        SetColors(TheGrid);
    }
    catch (Exception e)
    {
        Console.WriteLine(e.Message);
    }
}

网格打印

private void PrintDataGrid(Graphics g)
{
    StringFormat sf = new StringFormat();

    //if we want to print the grid right to left
    if (bRightToLeft)
    {
        CurrentX = PrintDoc.DefaultPageSettings.PaperSize.Width - 
        PrintDoc.DefaultPageSettings.Margins.Right;

        sf.FormatFlags = StringFormatFlags.DirectionRightToLeft;
    }
    else
    {
        CurrentX = PrintDoc.DefaultPageSettings.Margins.Left;
    }

    for (int i=0;i<PrintGrid.Rows;i++)
    {
        for (int j=0;j<PrintGrid.Columns;j++)
        {
            //set cell alignment
            switch (PrintGrid[i,j].Alignment)
            {
                    //left
                case HorizontalAlignment.Left:
                    sf.Alignment = StringAlignment.Near;
                    break;

                    //center
                case HorizontalAlignment.Center:
                    sf.Alignment = StringAlignment.Center;
                    break;

                    //right
                case HorizontalAlignment.Right:
                    sf.Alignment = StringAlignment.Far;
                    break;
            }

            //advance X according to order
            if (bRightToLeft)
            {
                //draw the cell bounds (lines)
                g.DrawRectangle(Pens.Black,CurrentX - PrintGrid[i,j].Width,
                CurrentY,PrintGrid[i,j].Width,PrintGrid[i,j].Height);

                //draw the cell text
                g.DrawString(PrintGrid[i,j].Text,
                   PrintGrid[i,j].Font,Brushes.Black,
                   new RectangleF(CurrentX - PrintGrid[i,j].Width, 
                   CurrentY, PrintGrid[i,j].Width,
                   PrintGrid[i,j].Height),sf);

                //next cell
                CurrentX -=PrintGrid[i,j].Width;

            }
            else
            {
                //draw the cell bounds (lines)
                g.DrawRectangle(Pens.Black ,CurrentX,CurrentY, 
                     PrintGrid[i,j].Width,PrintGrid[i,j].Height);

                //draw the cell text
                //Draw text by alignment
                    
                g.DrawString(PrintGrid[i,j].Text,PrintGrid[i,j].Font, 
                     Brushes.Black, new RectangleF(CurrentX,CurrentY, 
                     PrintGrid[i,j].Width,PrintGrid[i,j].Height),sf);

                //next cell
                CurrentX +=PrintGrid[i,j].Width;
            }

        }

        //reset to beginning
        if (bRightToLeft)
        {
            //right align
            CurrentX = PrintDoc.DefaultPageSettings.PaperSize.Width - 
                       PrintDoc.DefaultPageSettings.Margins.Right;
        }
        else
        {
            //left align
            CurrentX = PrintDoc.DefaultPageSettings.Margins.Left;
        }

        //advance to next row
        CurrentY = CurrentY + PrintGrid[i,0].Height;
    }
}

当前待办事项

修复 - 当网格为空时，标题打印不正确。
当网格大于页面的 WIDTH 时，继续到下一页。