help with where the item will be dropped during drag drop

[Tarscher]

Hi all,

Users can rearrange a listbox by a drag drop operation. All is
implemented but it's not always easy for the user to know where
exactly he is dropping his item. Does .net provide you with some sort
of functionality that indicates where you will drop your item?

Eg: when the user hovers between 2 items (Item3 and 4 here) a line
shows that it will be dropped between those 2 items. Can this be done?

Item1
Item2
item3

 

[ClayB]

Not sure how you are doing your D&D, but if you are using the Control
D&D events, one simple thing you could do is to move the selection are
you move the drop as below. To display a little line at the insertion
point would require more work.

void listBox2_DragOver(object sender, DragEventArgs e)
{
Point pt = this.listBox2.PointToClient(new Point(e.X, e.Y));
int index = this.listBox2.IndexFromPoint(pt);
if (index > -1 && index < list2.Count)
this.listBox2.SelectedIndex = index;
}
===============
Clay Burch
Syncfusion, Inc.

 

[ClayB]

You can find sample code in this FAQ entry that shows how to display a
red line at the drop site.

http://www.syncfusion.com/FAQ/WindowsForms/FAQ_c87c.aspx#q610q

=====================
Clay Burch
Syncfusion, Inc.