Multi Column Combo Cell for the .NET 2.0 DataGridView Control

protected override void OnDrawItem(System.Windows.Forms.DrawItemEventArgs e)<br />
{<br />
Rectangle rec = new Rectangle(e.Bounds.X, e.Bounds.Y, e.Bounds.Width, e.Bounds.Height);<br />
DataGridViewMultiColumnComboColumn column = ownerCell.OwningColumn as DataGridViewMultiColumnComboColumn;<br />
DataTable valuesTbl = column.valuesTbl;<br />
string joinByField = column.joinFieldName;<br />
SolidBrush NormalText = new SolidBrush(System.Drawing.SystemColors.ControlText);<br />
object currentItem = Items[e.Index];<br />
string currentText = GetItemText(currentItem);<br />
<br />
//If there is an item<br />
if (e.Index > -1)<br />
{<br />
//first redraw the normal while background<br />
SolidBrush normalBack = new SolidBrush(Color.White); //TODO: fix to be system edit box background<br />
e.Graphics.FillRectangle(normalBack, rec);<br />
if (DroppedDown && !(Margin.Top == rec.Top))<br />
{<br />
int currentOffset = rec.Left;<br />
<br />
//now find this text corrent join field<br />
DataRow[] itemRows = valuesTbl.Select("[" + joinByField + "]='" + currentText + "'");<br />
<br />
SolidBrush HightlightedBack = new SolidBrush(System.Drawing.SystemColors.Highlight);<br />
if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)<br />
{<br />
//draw selected color background<br />
e.Graphics.FillRectangle(HightlightedBack, rec);<br />
}<br />
StreamWriter sw = new StreamWriter(File.OpenWrite("record"));<br />
foreach (DataRow currentRow in itemRows)<br />
{<br />
bool addBorder = false;<br />
<br />
foreach (object dataRowItem in currentRow.ItemArray)<br />
{<br />
string value = dataRowItem.ToString(); //TODO: support for different types!!!<br />
<br />
<br />
<br />
#region DrawLine<br />
if (addBorder)<br />
{<br />
//draw dividing line<br />
//currentOffset ++; <br />
SolidBrush gridBrush = new SolidBrush(Color.Gray); //TODO: make the border color configurable<br />
long linesNum = lineWidth;<br />
while (linesNum > 0)<br />
{<br />
linesNum--;<br />
Point first = new Point(rec.Left + currentOffset, rec.Top);<br />
Point last = new Point(rec.Left + currentOffset, rec.Bottom);<br />
e.Graphics.DrawLine(new Pen(gridBrush), first, last);<br />
currentOffset++;<br />
}<br />
//currentOffset++;<br />
}<br />
else<br />
addBorder = true;<br />
#endregion<br />
<br />
//measure the string that we are goin to draw and cut it with wrapping if too large<br />
SizeF extent = e.Graphics.MeasureString(value, e.Font);<br />
Rectangle textRec = new Rectangle(currentOffset, rec.Y, (int)extent.Width + 20, rec.Height);<br />
<br />
//now draw the relevant to this column value text<br />
if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)<br />
{<br />
//draw selected<br />
SolidBrush HightlightedText = new SolidBrush(System.Drawing.SystemColors.HighlightText);<br />
//now redraw the backgrond it order to wrap the previous field if was too large<br />
e.Graphics.FillRectangle(HightlightedBack, currentOffset, rec.Y, fixedAlignColumnSize, extent.Height);<br />
//draw text as is <br />
e.Graphics.DrawString(value, e.Font, HightlightedText, textRec); sw.Write(value + "|");<br />
}<br />
else<br />
{<br />
//now redraw the backgrond it order to wrap the previous field if was too large<br />
e.Graphics.FillRectangle(normalBack, currentOffset, rec.Y, fixedAlignColumnSize, extent.Height);<br />
//draw text as is <br />
e.Graphics.DrawString(value, e.Font, NormalText, textRec); sw.Write(value + "|");<br />
}<br />
//advance the offset to the next position<br />
currentOffset += fixedAlignColumnSize;<br />
}<br />
sw.WriteLine();<br />
}<br />
sw.Close();<br />
}<br />
else<br />
//if happens when the combo is closed, draw single standard item view<br />
e.Graphics.DrawString(currentText, e.Font, NormalText, rec);<br />
}<br />
}<br />
/**************************************************************************************************/<br />
}