/// <summary>
/// Method called by the grid before the editing control is shown so it can adapt to the
/// provided cell style.
/// </summary>
public virtual void ApplyCellStyleToEditingControl(DataGridViewCellStyle dataGridViewCellStyle)
{
this.Font = dataGridViewCellStyle.Font;
if (dataGridViewCellStyle.BackColor.A < 255)
{
// The NumericUpDown control does not support transparent back colors
Color opaqueBackColor = Color.FromArgb(255, dataGridViewCellStyle.BackColor);
this.BackColor = opaqueBackColor;
this.dataGridView.EditingPanel.BackColor = opaqueBackColor;
}
else
{
this.BackColor = dataGridViewCellStyle.BackColor;
}
this.ForeColor = dataGridViewCellStyle.ForeColor;
this.TextAlign = DataGridViewNumericUpDownCell.TranslateAlignment(dataGridViewCellStyle.Alignment);
}
/// <summary>
/// Custom paints the cell. The base implementation of the DataGridViewTextBoxCell type is called first,
/// dropping the icon error and content foreground parts. Those two parts are painted by this custom implementation.
/// In this sample, the non-edited NumericUpDown control is painted by using a call to Control.DrawToBitmap. This is
/// an easy solution for painting controls but it's not necessarily the most performant. An alternative would be to paint
/// the NumericUpDown control piece by piece (text and up/down buttons).
/// </summary>
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)
{
if (this.DataGridView == null)
{
return;
}
// First paint the borders and background of the cell.
base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle, advancedBorderStyle,
paintParts & ~(DataGridViewPaintParts.ErrorIcon | DataGridViewPaintParts.ContentForeground));
Point ptCurrentCell = this.DataGridView.CurrentCellAddress;
bool cellCurrent = ptCurrentCell.X == this.ColumnIndex && ptCurrentCell.Y == rowIndex;
bool cellEdited = cellCurrent && this.DataGridView.EditingControl != null;
// If the cell is in editing mode, there is nothing else to paint
if (!cellEdited)
{
if (PartPainted(paintParts, DataGridViewPaintParts.ContentForeground))
{
// Paint a NumericUpDown control
// Take the borders into account
Rectangle borderWidths = BorderWidths(advancedBorderStyle);
Rectangle valBounds = cellBounds;
valBounds.Offset(borderWidths.X, borderWidths.Y);
valBounds.Width -= borderWidths.Right;
valBounds.Height -= borderWidths.Bottom;
// Also take the padding into account
if (cellStyle.Padding != Padding.Empty)
{
if (this.DataGridView.RightToLeft == RightToLeft.Yes)
{
valBounds.Offset(cellStyle.Padding.Right, cellStyle.Padding.Top);
}
else
{
valBounds.Offset(cellStyle.Padding.Left, cellStyle.Padding.Top);
}
valBounds.Width -= cellStyle.Padding.Horizontal;
valBounds.Height -= cellStyle.Padding.Vertical;
}
// Determine the NumericUpDown control location
valBounds = GetAdjustedEditingControlBounds(valBounds, cellStyle);
bool cellSelected = (cellState & DataGridViewElementStates.Selected) != 0;
if (renderingBitmap.Width < valBounds.Width ||
renderingBitmap.Height < valBounds.Height)
{
// The static bitmap is too small, a bigger one needs to be allocated.
renderingBitmap.Dispose();
renderingBitmap = new Bitmap(valBounds.Width, valBounds.Height);
}
// Make sure the NumericUpDown control is parented to a visible control
if (paintingNumericUpDown.Parent == null || !paintingNumericUpDown.Parent.Visible)
{
paintingNumericUpDown.Parent = this.DataGridView;
}
// Set all the relevant properties
paintingNumericUpDown.TextAlign = DataGridViewNumericUpDownCell.TranslateAlignment(cellStyle.Alignment);
paintingNumericUpDown.DecimalPlaces = this.DecimalPlaces;
paintingNumericUpDown.ThousandsSeparator = this.ThousandsSeparator;
paintingNumericUpDown.Font = cellStyle.Font;
paintingNumericUpDown.Width = valBounds.Width;
paintingNumericUpDown.Height = valBounds.Height;
paintingNumericUpDown.RightToLeft = this.DataGridView.RightToLeft;
paintingNumericUpDown.Location = new Point(0, -paintingNumericUpDown.Height - 100);
paintingNumericUpDown.Text = formattedValue as string;
Color backColor;
if (PartPainted(paintParts, DataGridViewPaintParts.SelectionBackground) && cellSelected)
{
backColor = cellStyle.SelectionBackColor;
}
else
{
backColor = cellStyle.BackColor;
}
if (PartPainted(paintParts, DataGridViewPaintParts.Background))
{
if (backColor.A < 255)
{
// The NumericUpDown control does not support transparent back colors
backColor = Color.FromArgb(255, backColor);
}
paintingNumericUpDown.BackColor = backColor;
}
// Finally paint the NumericUpDown control
Rectangle srcRect = new Rectangle(0, 0, valBounds.Width, valBounds.Height);
if (srcRect.Width > 0 && srcRect.Height > 0)
{
paintingNumericUpDown.DrawToBitmap(renderingBitmap, srcRect);
graphics.DrawImage(renderingBitmap, new Rectangle(valBounds.Location, valBounds.Size),
srcRect, GraphicsUnit.Pixel);
}
}
if (PartPainted(paintParts, DataGridViewPaintParts.ErrorIcon))
{
// Paint the potential error icon on top of the NumericUpDown control
base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText,
cellStyle, advancedBorderStyle, DataGridViewPaintParts.ErrorIcon);
}
}
}