/// <summary>
/// Raises the <see cref="E:System.Windows.Forms.Control.DragDrop" /> event.
/// </summary>
/// <param name="drgevent">A <see cref="T:System.Windows.Forms.DragEventArgs" /> that contains the event data.</param>
protected override void OnDragDrop(DragEventArgs drgevent)
{
if (IsRowDragInProgress)
{
try
{
ListViewItem dropItem;
dropItem = InsertionIndex != -1 ? Items[InsertionIndex] : null;
if (dropItem != null)
{
ListViewItem dragItem;
int dropIndex;
dragItem = (ListViewItem)drgevent.Data.GetData(typeof(ListViewItem));
dropIndex = dropItem.Index;
if (dragItem.Index < dropIndex)
{
dropIndex--;
}
if (InsertionMode == InsertionMode.After && dragItem.Index < Items.Count - 1)
{
dropIndex++;
}
if (dropIndex != dragItem.Index)
{
ListViewItemDragEventArgs args;
Point clientPoint;
clientPoint = PointToClient(new Point(drgevent.X, drgevent.Y));
args = new ListViewItemDragEventArgs(dragItem, dropItem, dropIndex, InsertionMode, clientPoint.X, clientPoint.Y);
OnItemDragDrop(args);
if (!args.Cancel)
{
Items.Remove(dragItem);
Items.Insert(dropIndex, dragItem);
SelectedItem = dragItem;
OnItemDragDropCompleted(args);
}
}
}
}
finally
{
InsertionIndex = -1;
IsRowDragInProgress = false;
Invalidate();
}
}
base.OnDragDrop(drgevent);
}
/// <summary>
/// Raises the <see cref="ItemDragDrop" /> event.
/// </summary>
/// <param name="e">The <see cref="ListViewItemDragEventArgs" /> instance containing the event data.</param>
protected virtual void OnItemDragDropCompleted(ListViewItemDragEventArgs e)
{
ItemDragDropCompleted?.Invoke(this, e);
}