BizDraw framework for .NET

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Windows.Forms;

namespace BizDraw.Printing
{
    [System.Runtime.InteropServices.ComVisible(true)]
    public partial class CellsSelector : UserControl
    {
        private DocumentPrintEngine _printEngine;
        private double  zoomFactorX = 1;
        private double  zoomFactorY = 1;
        private int currentPage = 0;
        private int cellHeight;
        private int cellWidth;
        private int rowsSep;
        private int colsSep;

        public CellsSelector()
        {
            InitializeComponent();
            SetStyle(ControlStyles.AllPaintingInWmPaint |
                ControlStyles.UserPaint | ControlStyles.DoubleBuffer, true);
            this.pCells.Paint += new PaintEventHandler(pCells_Paint);
            this.pCells.MouseClick += new MouseEventHandler(pCells_MouseClick);

        }

        void pCells_MouseClick(object sender, MouseEventArgs e)
        {
            if (e.Button != MouseButtons.Left)
                return;
            
            Cell selectedCell = GetCellFromPoint(e.X, e.Y);
            if (selectedCell == null)
                return;

            selectedCell.Selected = !selectedCell.Selected;
            Redraw();
        }
        private Cell GetCellFromPoint(int x, int y)
        {
            if (this.PrintEngine.Count == 0)
                return null ;

            for (int i = currentPage * this.PrintEngine.DocumentsPerPage; i < (currentPage + 1) * this.PrintEngine.DocumentsPerPage; i++)
            {
                if (i >= this.PrintEngine.Count)
                    return null ;
                
                Cell c = this.PrintEngine.Cells[i];
                Rectangle rect = RectFromCell(c);
                if (rect.Contains(new Point(x, y)))
                    return c;
            }
            return null;

        }
        void pCells_Paint(object sender, PaintEventArgs e)
        {
            if (this.PrintEngine == null || this.PrintEngine.Format == null  && this.PrintEngine.Columns == 0 || this.PrintEngine.Rows == 0)
                return;

            double mmToPixel = 96 / 25.4;
            double hInchToPixel = 0.96;

            //Zoom factors calculations
            double Xnum = (double)this.pCells.Width;
            double Xdenum = 96.0d * (double)this.PrintEngine.Format.PageSettings.PaperSize.Width / 100.0d;
            zoomFactorX = Xnum / Xdenum;

            double Ynum = (double)this.pCells.Height;
            double Ydenum = 96.0d * (double)this.PrintEngine.Format.PageSettings.PaperSize.Height / 100.0d;
            zoomFactorY = Ynum / Ydenum;
            
            //Painting cells
            cellHeight = Convert.ToInt32((this.PrintEngine.Format.PageSettings.PaperSize.Height - this.PrintEngine.Format.PageSettings.Margins.Top - this.PrintEngine.Format.PageSettings.Margins.Bottom) * zoomFactorY * hInchToPixel / this.PrintEngine.Rows);
            cellWidth = Convert.ToInt32((this.PrintEngine.Format.PageSettings.PaperSize.Width - this.PrintEngine.Format.PageSettings.Margins.Left - this.PrintEngine.Format.PageSettings.Margins.Right ) * zoomFactorX * hInchToPixel / this.PrintEngine.Columns);
            rowsSep = Convert.ToInt32(this.PrintEngine.Format.RowsSepHeight  * zoomFactorY * mmToPixel  );
            colsSep = Convert.ToInt32(this.PrintEngine.Format.ColumnsSepWidth  * zoomFactorX * mmToPixel );

            //painting margins
            Rectangle marginRect = this.PrintEngine.Format.PrintableArea;
            marginRect.X = Convert.ToInt32(marginRect.X * mmToPixel * zoomFactorX);
            marginRect.Y = Convert.ToInt32(marginRect.Y * zoomFactorY * mmToPixel);
            marginRect.Height = cellHeight * this.PrintEngine.Rows ;
            marginRect.Width = cellWidth * this.PrintEngine.Columns ;

            e.Graphics.DrawRectangle(new Pen(Brushes.Gray), marginRect);

            if (this.PrintEngine.Count == 0)
                return;
            for (int i = currentPage * this.PrintEngine.DocumentsPerPage; i < (currentPage + 1) * this.PrintEngine.DocumentsPerPage; i++)
            {
                if (i >= this.PrintEngine.Count)
                    return;
                DrawCell(e, this.PrintEngine.Cells[i]);
            }
        }
        internal void Redraw()
        {
            pCells_Paint(this.pCells, new PaintEventArgs(this.pCells.CreateGraphics(), this.pCells.ClientRectangle));
            pCells.Refresh();
        }
        private void DrawCell(PaintEventArgs e, Cell cell)
        {
            Rectangle cellRectangle = RectFromCell(cell);
            e.Graphics.DrawRectangle(new Pen(Brushes.Gray), cellRectangle);
            if (cell.Selected)
            {
               e.Graphics.FillRectangle(new SolidBrush(Color.Blue), new Rectangle( cellRectangle.X +1, cellRectangle.Y +1, cellRectangle.Width -1 ,cellRectangle.Height -1));
            }
        }
        private Rectangle RectFromCell(Cell cell)
        {
            Rectangle result = new Rectangle();
            result.X = cell.Column * (cellWidth + Convert.ToInt32( (double)colsSep  * 96.0 / 25.4 )) + Convert.ToInt32(this.PrintEngine.Format.PrintableArea.X * 96/25.4 * zoomFactorX);
            result.Y = cell.Row   * (cellHeight + Convert.ToInt32((double) rowsSep * 96.0/25.4) ) + Convert.ToInt32(this.PrintEngine.Format.PrintableArea.Y * 96/ 25.4 * zoomFactorY);
            result.Width = cellWidth;
            result.Height = cellHeight;
            return result;
        }
        public DocumentPrintEngine PrintEngine
        {
            get
            {
                return _printEngine;
            }
            set
            {
                if (_printEngine != value)
                {
                    _printEngine = value;
                    if (_printEngine !=null)
                        _printEngine.ParametersChanged += new EventHandler(_printEngine_ParametersChanged);
                }
            }
        }

        void _printEngine_ParametersChanged(object sender, EventArgs e)
        {
            currentPage = 0;
            SetPagesStatus();

            this.Redraw();
        }

        private void btNext_Click(object sender, EventArgs e)
        {
            this.currentPage++;
            SetPagesStatus();

        }
        private void SetPagesStatus()
        {
            int current = currentPage +1;
            if (this.PrintEngine.PagesCount == 0)
                current = 0;
            this.lCurrentPage.Text = string.Format("Page {0}/{1}  ", current.ToString() , this.PrintEngine.PagesCount.ToString());
            if (current >= this.PrintEngine.PagesCount)
                this.btNext.Enabled = false;
            else
                this.btNext.Enabled = true;

            if (this.currentPage > 0)
                this.btPrevious.Enabled = true;
            else
                this.btPrevious.Enabled = false;

            Redraw();
        }
        private void btPrevious_Click(object sender, EventArgs e)
        {
            this.currentPage--;
            SetPagesStatus();
        }
        
    }
}