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Thread: DataGridView Merging Cells

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  1. #1
    Join Date
    Nov 2003
    Posts
    53

    Lightbulb DataGridView Merging Cells

    I have seen a large number of people post questions regarding merging cells of a DataGridView, so I thought I would take a stab at it. Here is the Merged Cell Class.. Attached is the demo project, and image.

    For vertical merging, goto www.windowsforms.net and download the "Outlook Calender Look and Feel" sample.

    Code:
    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Data;
    using System.Drawing;
    using System.Text;
    using System.Windows.Forms;
    using System.Diagnostics;
    using System.Drawing.Drawing2D;
    
    
    namespace DataGridView_MergeDemo
    {
        public class HMergedCell : DataGridViewTextBoxCell
        {
            private int m_nLeftColumn = 0;
            private int m_nRightColumn = 0;
    
            /// <summary>
            /// Column Index of the left-most cell to be merged.
            /// This cell controls the merged text.
            /// </summary>
            public int LeftColumn
            {
                get
                {
                    return m_nLeftColumn;
                }
                set
                {
                    m_nLeftColumn = value;
                }
            }
    
            /// <summary>
            /// Column Index of the right-most cell to be merged
            /// </summary>
            public int RightColumn
            {
                get
                {
                    return m_nRightColumn;
                }
                set
                {
                    m_nRightColumn = value;
                }
            }
    
            protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
            {
                try
                {
                    int mergeindex = ColumnIndex - m_nLeftColumn;
                    int i;
                    int nWidth;
                    int nWidthLeft;
                    string strText;
    
                    Pen pen = new Pen(Brushes.Black);
    
                    // Draw the background
                    graphics.FillRectangle(new SolidBrush(SystemColors.Control), cellBounds);
    
                    // Draw the separator for rows
                    graphics.DrawLine(new Pen(new SolidBrush(SystemColors.ControlDark)), cellBounds.Left, cellBounds.Bottom - 1, cellBounds.Right, cellBounds.Bottom - 1);
    
                    // Draw the right vertical line for the cell
                    if (ColumnIndex == m_nRightColumn)
                        graphics.DrawLine(new Pen(new SolidBrush(SystemColors.ControlDark)), cellBounds.Right - 1, cellBounds.Top, cellBounds.Right - 1, cellBounds.Bottom);
    
                    // Draw the text
                    RectangleF rectDest = RectangleF.Empty;
                    StringFormat sf = new StringFormat();
                    sf.Alignment = StringAlignment.Center;
                    sf.LineAlignment = StringAlignment.Center;
                    sf.Trimming = StringTrimming.EllipsisCharacter;
    
                    // Determine the total width of the merged cell
                    nWidth = 0;
                    for (i = m_nLeftColumn; i <= m_nRightColumn; i++)
                        nWidth += this.OwningRow.Cells[i].Size.Width;
    
                    // Determine the width before the current cell.
                    nWidthLeft = 0;
                    for (i = m_nLeftColumn; i < ColumnIndex; i++)
                        nWidthLeft += this.OwningRow.Cells[i].Size.Width;
    
                    // Retrieve the text to be displayed
                    strText = this.OwningRow.Cells[m_nLeftColumn].Value.ToString();
    
                    rectDest = new RectangleF(cellBounds.Left - nWidthLeft, cellBounds.Top, nWidth, cellBounds.Height);
                    graphics.DrawString(strText, new Font("Arial", 10, FontStyle.Regular), Brushes.Black, rectDest, sf);
                }
                catch (Exception ex)
                {
                    Trace.WriteLine(ex.ToString());
                }
            }
    
        }// class
    }
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