Dynamically Resize GridHeaderRowElement?

[Michael]

In order to try to bend the will of the GridView to do something we're attempting, I'm trying to dynamically either completely hide or to change the height of a SPECIFIC group header row down to something 1 pixel in height if the group text is blank.

I've tried all of the following:

            if (e.RowElement is GridGroupHeaderRowElement)
            {
                e.RowElement.Size = new Size(1, 1);

                e.RowElement.ShouldPaint = false;
                e.RowElement.Visibility = ElementVisibility.Hidden;
                e.RowElement.MinSize = new Size(e.RowElement.Size.Width, 0);
                e.RowElement.Size = new Size(e.RowElement.Size.Width, 1);
                e.RowElement.CoercedSize = new Size(e.RowElement.Size.Width, 1);
                e.RowElement.StretchVertically = false;
                this.ApplyThemeToElement(e.RowElement, "ControlDefault");
            }

All this has done has completely hidden the group rows but still leaves blank space where they shuold be, however now I can't select them (which is nice).

Is there any way to change the size so the space left when hidden is minimized?

Thanks in advance.

[Jack]

Hello Michael,

The following code is enough to hide the group rows. You have to set only GridElement.GroupHeaderHeight property:

this.radGridView1.GridElement.GroupHeaderHeight = 0;

I hope this helps. Should you have any further questions, don't hesitate to write back.

Kind regards,
Jack
the Telerik team

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[Michael]

Jack,

This solution reduces the height of ALL group headers.

I want to do it to a specific groups headers. Basically, if the header's test is an empty string, I want to collapse the group header so it's not visible.

[Jack]

Hello Michael,

Thank you for this clarification. Now I understand what do you want to achieve. In this case you should replace the default TableViewDefinition and override its GetRowHeight method. Here is a sample:

this.radGridView1.ViewDefinition = new CustomTableViewDefinition();

public class CustomTableViewDefinition: TableViewDefinition
{
    public override int GetRowHeight(GridViewRowInfo rowInfo, IGridView gridView)
    {
        GridViewGroupRowInfo groupRowInfo = rowInfo as GridViewGroupRowInfo;
        if (groupRowInfo != null && string.IsNullOrEmpty(groupRowInfo.GetSummary()))
        {
            return 0;
        }
        return base.GetRowHeight(rowInfo, gridView);
    }
}

If you need further assistance, I will be glad to help.

All the best,
Jack
the Telerik team

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