DataGridView DragOver Scrolling

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Peter - 04 Jul 2007 08:00 GMT

I'm trying to figure out how to scroll the screen on a drag/drop DragOver
event for a DataGridView. I've got it scrolling down. I need some help in
figuring out how to scroll up.

private void DataGridDragOver(object sender,DragEventArgs e)
{
Rectangle rectangle = this.datagrid.ClientRectangle;

// this scrolls it down nicely.

if (e.Y > rectangle.Bottom)
this.datagrid.FirstDisplayedCell =
this.datagrid.Rows[this.datagrid.FirstDisplayedCell.RowIndex + 1].Cells[0];

// I'm looking for the triggering for determining that the grid needs to
scroll up. e.Y never goes below rectangle.Top. What do I need to check for
that indicates a scroll up is required?

}

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Peter - 04 Jul 2007 18:48 GMT

I found the answer to my own question. By reducing the height of the data
grid client rectangle to the size of the header, I can then test if the point
to client is within the header. Then using FirstDisplayedScrollingRowIndex, I
can force either a scroll up or down.

Rectangle rectangle = this.datagrid.ClientRectangle;

if (e.Y > rectangle.Bottom)
this.datagrid.FirstDisplayedScrollingRowIndex =
Math.Min(this.datagrid.FirstDisplayedScrollingRowIndex +
1,this.datagrid.Rows.Count - 1);

rectangle.Height = this.datagrid.ColumnHeadersHeight;

if (rectangle.Contains(point) == true)
this.datagrid.FirstDisplayedScrollingRowIndex =
Math.Max(this.datagrid.FirstDisplayedScrollingRowIndex - 1,0);
}

> I'm trying to figure out how to scroll the screen on a drag/drop DragOver
> event for a DataGridView. I've got it scrolling down. I need some help in
[quoted text clipped - 15 lines]
>
> }

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DataGridView DragOver Scrolling

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