Form Print Control

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

namespace FormPrintComponent
{
    public class TextboxControlPrintSetting: ControlPrintSetting
    {

        #region Private members
        private int _TotalLines = 1;
        private int _LinesPerPage  = 1;
        private int _CurrentLine  = 1;
        private string[] _Lines;

        private const string AverageText = @"ABCDEFGHIJKLMNOPQRSTUVWXYZ";

        #endregion

        /// <summary>
        /// The textbox to print
        /// </summary>
        private TextBox TextboxControl
        {
            get 
            {
                return (TextBox)base.Control;
            }
        }

        /// <summary>
        /// For each new logical page, set the text pointer back to the start
        /// of the control's text
        /// </summary>
        public override void NewLogicalPage()
        {
            base.NewLogicalPage();
            _CurrentLine = 0;
            _Lines = TextboxControl.Lines;
            _TotalLines = _Lines.Length;
        }

        /// <summary>
        /// Prints this textbox on the given page
        /// </summary>
        /// <param name="Canvas"></param>
        public override void PrintOnPage(System.Drawing.Graphics Canvas)
        {
            if (base.DataOverflowAction == DataOverflowActions.TruncateToFit)
            {
                // Print as much of the textbox's text as fits - this is the default behaviour
                // for a ControlPrintSetting
                base.PrintOnPage(Canvas);
            }
            else
            {
                // Print the background for this control
                base.PrintBackground(Canvas );
 
                // Get the height of a line of text....
                Single _lineHeight = Canvas.MeasureString(AverageText, base.PrintFont ).Height ;
                _LinesPerPage = base.BoundingRectangle.Height / (int)_lineHeight ;

                Rectangle _rcnextLine;

                _rcnextLine = new Rectangle(base.BoundingRectangle.Top, base.BoundingRectangle.Left, base.BoundingRectangle.Width, (int)_lineHeight);

                for (int n = _CurrentLine ; n < (_CurrentLine + _LinesPerPage ); n++)
                {
                    if (n > _TotalLines)
                    {
                        break;
                    }
                    else
                    {
                        base.PrintText(Canvas, _Lines[n], _rcnextLine);  
                        _rcnextLine.Offset(0, (int)_lineHeight);
                    }
                }
               // Increment the current line pointer
                _CurrentLine += _LinesPerPage;

                // Print the borders
                base.PrintBorders(Canvas); 

            }
        }

        /// <summary>
        /// Returns true if the data in this control needs more pages
        /// </summary>
        /// <remarks>
        /// For a multi line text box this is true if the current line is less than the total lines
        /// per page
        /// </remarks>
        public override bool HasMorePages
        {
            get
            {
                if (base.DataOverflowAction == DataOverflowActions.TruncateToFit)
                {
                    return false;
                }
                else
                {
                    if (_CurrentLine < _TotalLines)
                    {
                        return true;
                    }
                    else
                    {
                        return false;
                    }
                }
            }
        }

        #region Public constructor
        public TextboxControlPrintSetting(TextBox textboxToPrint) : base(textboxToPrint )
        {
            // Initailise the textbox pointer to the start of the text
            this.NewLogicalPage();
        }
        #endregion

    }
}