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);
}
