Question

I’m using UltraWin Grid 12 (Infragistics) for Win Forms (vb.net 2010 Framework 3.5) .

Is there a way to hide all rows and only show the filtered In rows?. I need to show nothing unless a filter is selected, and when all filters are unselected, hide all rows again.

I tried a For Each … row.hidden = true, but no luck.

Answer 1

You can use a draw filter to hide all of the rows when there aren’t any that are filtered out:

public class HideRowsDrawFilter:IUIElementDrawFilter
{
    private UltraGrid grid;
    public HideRowsDrawFilter(UltraGrid grid)
    {
        this.grid = grid;
    }

    public bool DrawElement(DrawPhase drawPhase, ref UIElementDrawParams drawParams)
    {
        if (this.grid.DisplayLayout.Rows.GetFilteredOutNonGroupByRows().Length == 0)
            return true;
        return false;
    }

    public DrawPhase GetPhasesToFilter(ref UIElementDrawParams drawParams)
    {
        if (drawParams.Element is RowUIElement)
            return DrawPhase.BeforeDrawElement;
        return DrawPhase.None;
    }
}

To set the draw filter of the grid, use the following:

this.ultraGrid1.DrawFilter = new HideRowsDrawFilter(this.ultraGrid1);

Note that this only prevents drawing of the rows and they are still there so unless you disable them in another way, selection, editing, and activation will still happen.