public static ListViewItemSnap Start(ListView lv)
{
switch (lv.View)
{
case View.LargeIcon:
case View.Tile:
break;
default: return(null);
}
//
var items = lv.GetSortedItems();
var q = new ListViewItemSnap();
GameListItem first = null;
foreach (var pair in items)
{
var item = pair.Value;
if (first == null)
{
first = item;
q.refX = first.Position.X;
q.refY = first.Position.Y;
}
else if (q.divX == 0 && item.Position.X != q.refX)
{
q.divX = item.Position.X - first.Position.X;
}
else if (q.divY == 0 && item.Position.Y != q.refY)
{
q.divY = item.Position.Y - first.Position.Y;
}
}
return(first != null ? q : null);
}
private void lvApps_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button != MouseButtons.Left)
{
return;
}
dragItem = lvApps.GetItemAt(e.X, e.Y);
if (dragItem == null)
{
return;
}
dragItemOrigin = new Point(e.X - dragItem.Position.X, e.Y - dragItem.Position.Y);
lvApps.AutoArrange = false;
lvApps.MouseMove += lvApps_MouseMove;
dragSnap = ListViewItemSnap.Start(lvApps);
}