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| public class PrintGridDocument : PrintDocument
{
//Data Members
private DataGrid m_oDataGrid;
private int m_nCurrPage;
private int m_nCurrRow;
private int m_nColumns;
private int m_nRows;
private bool m_bInitialized;
private int m_nLinesPerPage;
private int m_nTotalPages;
private int[] m_nColBounds;
//Properties
public Font PrintFont;
public string Title;
public PrintGridDocument(DataGrid aGrid) : base()
{
//Default Values
m_oDataGrid = aGrid;
m_nCurrPage = 0;
m_nCurrRow = 0;
m_bInitialized = false;
//Get total number of cols/rows in the data source
m_nColumns = ((DataTable)(m_oDataGrid.DataSource)).Columns.Count;
m_nRows = ((DataTable)(m_oDataGrid.DataSource)).Rows.Count;
}
//Override OnBeginPrint to set up the font we are going to use
protected override void OnBeginPrint(PrintEventArgs ev)
{
base.OnBeginPrint(ev);
//If client has not created a font, create a default font
// Note: an exception could be raised here, but it is deliberately not
// being caught because there is nothing we could do at this point!
if(PrintFont == null)
PrintFont = new Font("Arial", 9);
}
//Override the OnPrintPage to provide the printing logic for the document
protected override void OnPrintPage(PrintPageEventArgs e)
{
//Call base method
base.OnPrintPage(e);
//Get the margins
int nTextPosX = e.MarginBounds.Left;
int nTextPosY = e.MarginBounds.Top;
//Do first time initialization stuff
if(!m_bInitialized)
{
// Calculate the number of lines per page.
m_nLinesPerPage = (int)(e.MarginBounds.Height / PrintFont.GetHeight(e.Graphics));
m_nTotalPages = (int)Math.Ceiling((float)m_nRows / (float)m_nLinesPerPage);
//Create bounding box for columns
m_nColBounds = new int[m_nColumns];
//Calculate the correct spacing for the columns
for(int nCol = 0;nCol<m_nColumns;nCol++)
{
//Measure the column headers first
m_nColBounds[nCol] = (int)e.Graphics.MeasureString(
((DataTable)(m_oDataGrid.DataSource)).Columns[nCol].ColumnName, PrintFont).Width;
for(int nRow=0;nRow<m_nRows;nRow++)
{
//Compare data to current max
if(e.Graphics.MeasureString(m_oDataGrid[nRow,nCol].ToString(),PrintFont).Width > m_nColBounds[nCol])
m_nColBounds[nCol] = (int)e.Graphics.MeasureString(m_oDataGrid[nRow,nCol].ToString(),PrintFont).Width;
}
//Just use max possible size if too large
if(m_nColBounds[nCol] > e.MarginBounds.Width / m_nColumns)
m_nColBounds[nCol] = e.MarginBounds.Width / m_nColumns;
//Can't be less than column width
if(m_nColBounds[nCol] < (int)Math.Round(e.Graphics.MeasureString(((DataTable)(m_oDataGrid.DataSource)).Columns[nCol].ColumnName, PrintFont).Width))
m_nColBounds[nCol] = (int)Math.Round(e.Graphics.MeasureString(((DataTable)(m_oDataGrid.DataSource)).Columns[nCol].ColumnName, PrintFont).Width);
}
//Move to correct starting page
if(this.PrinterSettings.PrintRange == PrintRange.SomePages)
{
while(m_nCurrPage < this.PrinterSettings.FromPage-1)
{
//Move to next page - advance data to next page as well
m_nCurrRow += m_nLinesPerPage;
m_nCurrPage++;
if(m_nCurrRow > m_nRows)
return;
}
if(m_nCurrPage > this.PrinterSettings.ToPage)
{
//Don't print anything more
return;
}
}
//Set flag
m_bInitialized = true;
}
//Move to next page
m_nCurrPage++;
//Print Title if first page
if(m_nCurrPage == 1)
{
Font TitleFont = new Font("Arial",15);
int nXPos = (int)(((e.PageBounds.Right - e.PageBounds.Left) /2 ) -
(e.Graphics.MeasureString(Title,TitleFont).Width / 2));
e.Graphics.DrawString(Title,TitleFont,Brushes.Black,nXPos,e.MarginBounds.Top - TitleFont.GetHeight(e.Graphics) - 10);
}
//Draw page number
string strOutput = "Page " + m_nCurrPage + " of " + m_nTotalPages;
e.Graphics.DrawString(strOutput,PrintFont,Brushes.Black,e.MarginBounds.Right - e.Graphics.MeasureString(strOutput,PrintFont).Width,
e.MarginBounds.Bottom);
//Utility rectangle - use for many drawing operations
Rectangle aRect = new Rectangle();
//Loop through data
for(int nRow=m_nCurrRow; nRow < m_nRows; nRow++)
{
//Draw the current row within a shaded/unshaded box
aRect.X = e.MarginBounds.Left;
aRect.Y = nTextPosY;
aRect.Width = e.MarginBounds.Width;
aRect.Height = (int)PrintFont.GetHeight(e.Graphics);
//Draw the box
if(nRow%2 == 0)
e.Graphics.FillRectangle(Brushes.LightGray,aRect);
e.Graphics.DrawRectangle(Pens.Black,aRect);
//Loop through each column
for(int nCol=0; nCol < m_nColumns; nCol++)
{
//Set the rectangle to the correct position
aRect.X = nTextPosX;
aRect.Y = nTextPosY;
aRect.Width = m_nColBounds[nCol];
aRect.Height = (int)PrintFont.GetHeight(e.Graphics);
//Print the data
e.Graphics.DrawString(m_oDataGrid[nRow,nCol].ToString(),PrintFont,Brushes.Black,aRect);
//Advance the x Position counter
nTextPosX += m_nColBounds[nCol];
}
//Reassign the x position counter
nTextPosX = e.MarginBounds.Left;
//Move the y position counter down a line
nTextPosY += (int)PrintFont.GetHeight(e.Graphics);
//Check to see if we have reached the line limit - move to a new page if so
if(nRow - ((m_nCurrPage-1) * m_nLinesPerPage) == m_nLinesPerPage)
{
//Save the current row
m_nCurrRow = ++nRow;
e.HasMorePages = true;
return;
}
}
}
} |
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