protected override System.Drawing.Size GetPreferredSize(System.Drawing.Graphics graphics, DataGridViewCellStyle cellStyle, int rowIndex, System.Drawing.Size constraintSize)
{
if (ownerCell != null)
{
return(new System.Drawing.Size(0, 0));
}
var size = base.GetPreferredSize(graphics, cellStyle, rowIndex, constraintSize);
var grid = DataGridView;
int rangwidth = 0;
foreach (int w in DataGridViewCellExHelper.Range(ColumnIndex + 1, columnSpan - 1))
{
rangwidth += grid.Columns[w].Width;
}
var width = size.Width - rangwidth;
int rangheight = 0;
foreach (int w in DataGridViewCellExHelper.Range(RowIndex + 1, RowSpan - 1))
{
rangheight += grid.Rows[w].Height;
}
var height = size.Height - rangheight;
return(new System.Drawing.Size(width, height));
}
private void SetSpan(int columnspan, int rowspan)
{
int prevColumnSpan = columnSpan;
int prevRowSpan = rowSpan;
columnSpan = columnspan;
rowSpan = rowspan;
if (DataGridView != null)
{
//清除之前的合并
foreach (int rowIndex in DataGridViewCellExHelper.Range(RowIndex, prevRowSpan))
{
foreach (int colIndex in DataGridViewCellExHelper.Range(ColumnIndex, prevColumnSpan))
{
var cell = DataGridView[colIndex, rowIndex] as DataGridViewTextBoxCellEx;
if (cell != null)
{
cell.OwnerCell = null;
}
}
}
//设置新的合并
foreach (int row in DataGridViewCellExHelper.Range(RowIndex, rowSpan))
{
foreach (int col in DataGridViewCellExHelper.Range(ColumnIndex, columnSpan))
{
var cell = DataGridView[col, row] as DataGridViewTextBoxCellEx;
if (cell != null && cell != this)
{
if (cell.ColumnSpan > 1)
{
cell.ColumnSpan = 1;
}
if (cell.RowSpan > 1)
{
cell.RowSpan = 1;
}
cell.OwnerCell = this;
}
}
}
OwnerCell = null;
DataGridView.Invalidate();
}
}
private bool CellsRegionContainsSelectedCell(int columnIndex, int rowIndex, int columnSpan, int rowSpan)
{
if (DataGridView == null)
{
return(false);
}
foreach (int col in DataGridViewCellExHelper.Range(columnIndex, columnSpan))
{
foreach (int row in DataGridViewCellExHelper.Range(rowIndex, rowSpan))
{
if (DataGridView[col, row].Selected)
{
return(true);
}
}
}
return(false);
}
public override System.Drawing.Rectangle PositionEditingPanel(System.Drawing.Rectangle cellBounds, System.Drawing.Rectangle cellClip, DataGridViewCellStyle cellStyle, bool singleVerticalBorderAdded, bool singleHorizontalBorderAdded, bool isFirstDisplayedColumn, bool isFirstDisplayedRow)
{
if (ownerCell == null && columnSpan == 1 && rowSpan == 1)
{
return(base.PositionEditingPanel(cellBounds, cellClip, cellStyle, singleVerticalBorderAdded, singleHorizontalBorderAdded, isFirstDisplayedColumn, isFirstDisplayedRow));
}
var _ownerCell = this;
if (ownerCell != null)
{
var rowIndex = ownerCell.RowIndex;
cellStyle = ownerCell.GetInheritedStyle(null, rowIndex, true);
ownerCell.GetFormattedValue(ownerCell.Value, rowIndex, ref cellStyle, null, null, DataGridViewDataErrorContexts.Formatting);
var editingControl = DataGridView.EditingControl as IDataGridViewEditingControl;
if (editingControl != null)
{
editingControl.ApplyCellStyleToEditingControl(cellStyle);
var editingPanel = DataGridView.EditingControl.Parent;
if (editingPanel != null)
{
editingPanel.BackColor = cellStyle.BackColor;
}
}
_ownerCell = ownerCell;
}
cellBounds = DataGridViewCellExHelper.GetSpannedCellBoundsFromChildCellBounds(this, cellBounds, singleVerticalBorderAdded, singleHorizontalBorderAdded);
cellClip = DataGridViewCellExHelper.GetSpannedCellClipBounds(_ownerCell, cellBounds, singleVerticalBorderAdded, singleHorizontalBorderAdded);
return(base.PositionEditingPanel(cellBounds
, cellClip
, cellStyle
, singleVerticalBorderAdded
, singleHorizontalBorderAdded
, DataGridViewCellExHelper.InFirstDisplayedColumn(_ownerCell)
, DataGridViewCellExHelper.InFirstDisplayedRow(_ownerCell)));
}
protected override void Paint(System.Drawing.Graphics graphics, System.Drawing.Rectangle clipBounds, System.Drawing.Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
{
if (ownerCell != null && ownerCell.DataGridView == null)
{
ownerCell = null;
}
if (DataGridView == null || (ownerCell == null && columnSpan == 1 && rowSpan == 1))
{
base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts);
return;
}
var _ownerCell = this;
var columnIndex = ColumnIndex;
var _columnSpan = columnSpan;
var _rowSpan = rowSpan;
if (ownerCell != null)
{
_ownerCell = ownerCell;
columnIndex = ownerCell.ColumnIndex;
rowIndex = ownerCell.RowIndex;
_columnSpan = ownerCell.ColumnSpan;
_rowSpan = ownerCell.RowSpan;
value = ownerCell.GetValue(rowIndex);
errorText = ownerCell.GetErrorText(rowIndex);
cellState = ownerCell.State;
cellStyle = ownerCell.GetInheritedStyle(null, rowIndex, true);
formattedValue = ownerCell.GetFormattedValue(value, rowIndex, ref cellStyle, null, null, DataGridViewDataErrorContexts.Display);
}
if (CellsRegionContainsSelectedCell(columnIndex, rowIndex, _columnSpan, _rowSpan))
{
cellState |= DataGridViewElementStates.Selected;
}
var cellBounds2 = DataGridViewCellExHelper.GetSpannedCellBoundsFromChildCellBounds
(this
, cellBounds
, DataGridViewCellExHelper.SingleVerticalBorderAdded(DataGridView)
, DataGridViewCellExHelper.SingleHorizontalBorderAdded(DataGridView));
clipBounds = DataGridViewCellExHelper.GetSpannedCellClipBounds
(_ownerCell
, cellBounds2
, DataGridViewCellExHelper.SingleVerticalBorderAdded(DataGridView)
, DataGridViewCellExHelper.SingleHorizontalBorderAdded(DataGridView));
using (var g = DataGridView.CreateGraphics())
{
g.SetClip(clipBounds);
advancedBorderStyle = DataGridViewCellExHelper.AdjustCellBorderStyle(_ownerCell);
_ownerCell.NativePaint(g, clipBounds, cellBounds2, rowIndex, cellState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts & ~DataGridViewPaintParts.Border);
if ((paintParts & DataGridViewPaintParts.Border) != DataGridViewPaintParts.None) //这表示是合并单元格的最左边的单元格，边框不能画四边，只能画左上2边
{
var leftTopCell = _ownerCell;
var advancedBorderStyle2 = new DataGridViewAdvancedBorderStyle
{
Left = advancedBorderStyle.Left,
Top = advancedBorderStyle.Top,
Right = DataGridViewAdvancedCellBorderStyle.None,
Bottom = DataGridViewAdvancedCellBorderStyle.None
};
leftTopCell.PaintBorder(g, clipBounds, cellBounds2, cellStyle, advancedBorderStyle2);
var rightBottomCell = DataGridView[columnIndex + _columnSpan - 1, rowIndex + _rowSpan - 1] as DataGridViewTextBoxCellEx ?? this;
var advancedBorderStyle3 = new DataGridViewAdvancedBorderStyle
{
Left = DataGridViewAdvancedCellBorderStyle.None,
Top = DataGridViewAdvancedCellBorderStyle.None,
Right = advancedBorderStyle.Right,
Bottom = advancedBorderStyle.Bottom
};
rightBottomCell.PaintBorder(g, clipBounds, cellBounds2, cellStyle, advancedBorderStyle3);
}
}
}