}
public HeaderCollection Headers{ get;private set; }
protected override void OnCellPainting(DataGridViewCellPaintingEventArgs e)
{
if (e.ColumnIndex == -1 || e.RowIndex != -1)
{
base.OnCellPainting(e);
return;
}
int lev=this.Headers.GetHeaderLevels();
this.ColumnHeadersHeight = (lev + 1) * _baseColumnHeadHeight;
for (int i = 0; i <= lev; i++)
{
HeaderItem tempHeader= this.Headers.GetHeaderByLocation(e.ColumnIndex, i);
if (tempHeader==null|| i != tempHeader.EndY || e.ColumnIndex != tempHeader.StartX) continue;
DrawHeader(tempHeader, e);
}
e.Handled = true;
}
private int ComputeWidth(int startX, int endX)
{
int width = 0;
for (int i = startX; i <= endX; i++)
width+= this.Columns[i].Width;
return width;
}
private int ComputeHeight(int startY, int endY)
{
return _baseColumnHeadHeight * (endY - startY+1);
}
private void DrawHeader(HeaderItem item,DataGridViewCellPaintingEventArgs e)
