protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e)
{
if (e.RowIndex == -1 || e.ColumnIndex == -1)
{
return;
}
DataGridViewCell cell = this[e.ColumnIndex, e.RowIndex];
if (e.RowIndex == 1 && e.ColumnIndex == 2)
{
e.Handled = true;
return;
}
if (cell is DataGridViewCombineCell)
{
DataGridViewCombineCell combineCell = cell as DataGridViewCombineCell;
Rectangle rect = GetCombinedRect(combineCell);
DrawCombinCellBackground(combineCell, e.Graphics, rect);
if (combineCell.Selected)
{
ControlPaint.DrawFocusRectangle(e.Graphics, rect);
}
DrawCombinCellText(combineCell, e.Graphics, rect);
e.Handled = true;
return;
}
base.OnCellPainting(e);
}
private void DrawCombinCellBackground(DataGridViewCombineCell combineCell, Graphics graphics, Rectangle rect)
{
Brush bruCellBackColor = GetCellBackColorBrush(combineCell, combineCell.Selected);
Pen penCellBorder = GetCellBorderPen(combineCell);
graphics.FillRectangle(bruCellBackColor, rect);
graphics.DrawLine(penCellBorder, new Point(rect.Left, rect.Bottom - 1), new Point(rect.Right, rect.Bottom - 1));
graphics.DrawLine(penCellBorder, new Point(rect.Right - 1, rect.Top), new Point(rect.Right - 1, rect.Bottom - 1));
bruCellBackColor.Dispose();
penCellBorder.Dispose();
}
private void DrawCombinCellText(DataGridViewCombineCell combineCell, Graphics graphics, Rectangle rect)
{
if (combineCell.Value != null)
{
StringFormat sf = new StringFormat();
DataGridViewContentAlignment alignment = combineCell.Style.Alignment == DataGridViewContentAlignment.NotSet
? DefaultCellStyle.Alignment : combineCell.Style.Alignment;
switch (alignment)
{
case DataGridViewContentAlignment.BottomCenter:
break;
case DataGridViewContentAlignment.BottomLeft:
break;
case DataGridViewContentAlignment.BottomRight:
break;
case DataGridViewContentAlignment.MiddleCenter:
break;
case DataGridViewContentAlignment.MiddleLeft:
break;
case DataGridViewContentAlignment.MiddleRight:
break;
case DataGridViewContentAlignment.NotSet:
break;
case DataGridViewContentAlignment.TopCenter:
break;
case DataGridViewContentAlignment.TopLeft:
break;
case DataGridViewContentAlignment.TopRight:
break;
default:
break;
}
Font font = combineCell.Style.Font == null ? DefaultCellStyle.Font : combineCell.Style.Font;
Brush bruForeColor = new SolidBrush(combineCell.Style.ForeColor.IsEmpty ? DefaultCellStyle.ForeColor : combineCell.Style.ForeColor);
graphics.DrawString(combineCell.Value.ToString(), font, bruForeColor, rect, sf);
bruForeColor.Dispose();
}
}
private Rectangle GetCombinedRect(DataGridViewCombineCell combineCell)
{
Rectangle rect = GetCellDisplayRectangle(combineCell.ColumnIndex, combineCell.RowIndex, false);
for (int i = 0; i < combineCell.ColSpan - 1; i++)
{
rect.Width += this.Columns[combineCell.ColumnIndex + i + 1].Width;
}
for (int i = 0; i < combineCell.RowSpan - 1; i++)
{
rect.Height += this.Rows[combineCell.RowIndex + i + 1].Height;
}
return(rect);
}
private Brush GetCellBackColorBrush(DataGridViewCombineCell combineCell, bool selected)
{
if (selected)
{
if (!combineCell.Style.SelectionBackColor.IsEmpty)
{
return(new SolidBrush(combineCell.Style.SelectionBackColor));
}
return(new SolidBrush(DefaultCellStyle.SelectionBackColor));
}
else
{
if (!combineCell.Style.BackColor.IsEmpty)
{
return(new SolidBrush(combineCell.Style.BackColor));
}
return(new SolidBrush(DefaultCellStyle.BackColor));
}
}
private Pen GetCellBorderPen(DataGridViewCombineCell combineCell)
{
return(new Pen(this.GridColor));
}