BizDraw framework for .NET

using System;
using System.Collections.Generic;
using System.Text;
using BizDraw.Core ;
using System.Drawing.Printing ;
using System.Drawing ;
using System.Windows.Forms;
namespace BizDraw.Printing
{
    [System.Runtime.InteropServices.ComVisible(true)]
    public class DocumentPrintEngine
    {
        private Document _document;
        private int _count = 0;
        private int _pagesCount = 0;
        private int _columns = 0;
        private int _rows = 0;
        private int currentPage;
        private List<Cell> _cells;
        internal  PrintDocument printDocument;
        private PrintFormat _format;
        internal event EventHandler ParametersChanged;
        public DocumentPrintEngine()
        {
            printDocument = new PrintDocument();
            this.printDocument.BeginPrint += new PrintEventHandler(printDocument_BeginPrint);
            this.printDocument.PrintPage += new PrintPageEventHandler(printDocument_PrintPage);
            this.printDocument.EndPrint += new PrintEventHandler(printDocument_EndPrint);
        }
        #region Properties

        /// <summary>
        /// Get/Set the document to print
        /// </summary>
        public Document Document
        {
            get
            {
                return _document;
            }
            set
            {
                _document = value;
            }
        }
        /// <summary>
        /// Get/Set the number of documents to print
        /// </summary>
        public int Count
        {
            get
            {
                return _count ;
            }
            set
            {
                if (_count != value )
                {
                    _count = value;
                    Prepare();
                }
            }
        }
        /// <summary>
        /// get the number of columns per page
        /// </summary>
        public int Columns
        {
            get { return _columns; }
        }
        /// <summary>
        /// Get the number of rows per page
        /// </summary>
        public int Rows
        {
            get { return _rows; }
        }
        /// <summary>
        /// Gets the number of documents to print per page
        /// </summary>
        public int DocumentsPerPage
        {
            get
            {
                return Columns * Rows ;
            }
        }
        /// <summary>
        /// Gets the number of pages to print
        /// </summary>
        public int PagesCount
        {
            get
            {
                return _pagesCount;
            }
        }
        /// <summary>
        /// Get/Set the printing format used to print the document
        /// </summary>
        public PrintFormat Format
        {
            get { return _format; }
            set {
                if (_format != value)
                {
                    _format = value;
                    Prepare();
                }
            }
        }
        public List<Cell> Cells
        {
            get
            {
                return _cells;
            }
        }
        #endregion
        #region Methods
        /// <summary>
        /// Do calculations for the print operation
        /// </summary>
        internal void Prepare()
        {
            if (this.Document.IsDataBound())
            {
                this.Count =  this.Document.DataSource.RowsCount;
            }
            _columns =Convert.ToInt32( Math.Floor((double)(this.Format.PrintableArea.Width  + this.Format.ColumnsSepWidth) / (this.Format.ColumnsSepWidth + this.Document.Width)));
            _rows = Convert.ToInt32( Math.Floor((double)(this.Format.PrintableArea.Height    + this.Format.ColumnsSepWidth) / (this.Format.ColumnsSepWidth + this.Document.Height )));

            _cells = new List<Cell>(this.Count );
            _pagesCount = 0;
            int z = 0;
            while (z < this.Count)
            {
                for (int i = 0; i < _rows; i++)
                {
                    for (int j = 0; j < _columns; j++)
                    {
                        if (z >= this.Count)
                        {
                            _pagesCount++;
                            goto end;
                        }
                        this.Cells.Add(new Cell(i, j));
                        z++;
                    }
                }
                _pagesCount++;
            }
            end:
            if (ParametersChanged != null)
                ParametersChanged(this, EventArgs.Empty);
        }
        /// <summary>
        /// Prints the document using the current properties
        /// </summary>
        public void Print()
        {
            currentPage = 0;
            this.printDocument.DefaultPageSettings = this.Format.PageSettings; 
            this.printDocument.Print();
        }
        /// <summary>
        /// Show th printing setup dialog
        /// </summary>
        public void ShowDialog()
        {
            FrmPrintSetup frm = new FrmPrintSetup();
            frm.PrintEngine = this;
            frm.ShowDialog();
        }
        #endregion
        #region Print events
        void printDocument_BeginPrint(object sender, PrintEventArgs e)
        {
            Document.DesignMode = false;
        }

        void printDocument_EndPrint(object sender, PrintEventArgs e)
        {
            Document.DesignMode = true;
            if (Document.IsDataBound())
                Document.DataSource.EndInitialize();
        }
        void printDocument_PrintPage(object sender, PrintPageEventArgs e)
        {
            int i = 0;
            e.Graphics.ScaleTransform(100f / 96f, 100f / 96f);
            for (i = DocumentsPerPage * currentPage; i < (currentPage + 1) * DocumentsPerPage; i++)
            {
                if (i >= this.Count)
                {
                    e.HasMorePages = false;
                    return;
                }
                Cell cell = this.Cells[i];
                
                double mmToPixel = 96 / 25.4d;
                int xTranslation = Convert.ToInt32(cell.Column * (Document.Width + Format.ColumnsSepWidth) * mmToPixel  + Format.PageSettings.Margins.Left  );
                int yTranslation = Convert.ToInt32((double)cell.Row  * (double)(Document.Height + Format.RowsSepHeight ) * mmToPixel + (double)Format.PageSettings.Margins.Top);
                
                System.Drawing.Drawing2D.GraphicsContainer container = e.Graphics.BeginContainer();
                e.Graphics.TranslateTransform((float)xTranslation, (float)yTranslation);
                Document.Items.Draw(e.Graphics);
                e.Graphics.EndContainer(container);

                if (this.Document.IsDataBound())
                    this.Document.DataSource.MoveNext();
            }
            
            currentPage++;
            if (currentPage >= this.PagesCount)
                e.HasMorePages = false;
            else 
                e.HasMorePages = true;          

        }

        #endregion
    }
}