Highlighting Column/Row Headers

[Akshay Arora]

using GridControl I''m trying to figure out how to get the column/row headers to mark which cells are currenctly selected. I was hoping that there would be a property for this. I noticed in Designer, the Property section of the GridControl, it had a MarkRowHeader and a MarkColHeader property, but it''s set to true and it doesn''t highlight the selected row or column. I''ve come up with something, but it''s pretty slow. In the SelectionChanged event I change the background color of Row[0] and Col[0] to LightGray and then I go through the Selections property of the grid and change the appropriate column/row to a different color. This runs rather slow. I did it with BeginInit and EndInit and without to see the differences. Any suggestions?

[Administrator]

I think you can do this using these two events.

private void grid_CurrentCellMoved(object sender, GridCurrentCellMovedEventArgs e)
{
	GridCurrentCell cc = this.grid.CurrentCell;
	this.grid.RefreshRange(GridRangeInfo.Cell(0, cc.MoveFromColIndex));
	this.grid.RefreshRange(GridRangeInfo.Cell(0, cc.MoveToColIndex));
	this.grid.RefreshRange(GridRangeInfo.Cell(cc.MoveFromRowIndex, 0));
	this.grid.RefreshRange(GridRangeInfo.Cell(cc.MoveToRowIndex, 0));
}

private void grid_PrepareViewStyleInfo(object sender, GridPrepareViewStyleInfoEventArgs e)
{
	GridCurrentCell cc = this.grid.CurrentCell;
	if((e.RowIndex == 0 && e.ColIndex == cc.ColIndex)
		|| (e.ColIndex == 0 && e.RowIndex == cc.RowIndex))
	{
		e.Style.BackColor = mColor;
	}
}

[Akshay Arora]

Hi,

This works great if only a single cell is selected. Is there a way to do it for all selected cells? I thought about perhaps using grid.RefreshRange within the SelectionChanged event, but that starts to cause Exceptions within another event (Mouse event).

[Akshay Arora]

Hi again, I''ve actually been able to come up with a reasonable solution. For anyone else that might need this in the future:

private void HandleGridSelectionChanged( object sender, GridSelectionChangedEventArgs e ){
			if( sender is GridControl ){
				GridControl grid = (GridControl) sender;
				grid.RefreshRange( GridRangeInfo.Row( 0 ) );
				grid.RefreshRange( GridRangeInfo.Col( 0 ) );
			}
		}

private void HandleGridPrepareViewStyleInfo( object sender, GridPrepareViewStyleInfoEventArgs e ){
			GridControl grid = (GridControl) sender;
			for( int i = 0; i < grid.Selections.Ranges.Count; i++ ){
				GridRangeInfo gri = grid.Selections.Ranges[ i ];
				if( ( e.ColIndex >= gri.Left && e.ColIndex <= gri.Right && e.RowIndex == 0 ) ||
						( e.RowIndex >= gri.Top && e.RowIndex <= gri.Bottom && e.ColIndex == 0 ) ){
					e.Style.BackColor = Color.LightBlue;
					break;
				}
			}
		}