/// <summary>
/// Raises the <see cref="ItemDragging" /> event.
/// </summary>
/// <param name="e">The <see cref="CancelListBoxItemDragEventArgs" /> instance containing the event data.</param>
protected virtual void OnItemDragging(CancelListBoxItemDragEventArgs e)
{
EventHandler <CancelListBoxItemDragEventArgs> handler;
handler = this.ItemDragging;
handler?.Invoke(this, e);
}
/// <summary>
/// Raises the <see cref="E:System.Windows.Forms.Control.MouseMove"/> event.
/// </summary>
/// <param name="e">A <see cref="T:System.Windows.Forms.MouseEventArgs"/> that contains the event data. </param>
protected override void OnMouseMove(MouseEventArgs e)
{
if (!this.IsDragging && e.Button == MouseButtons.Left && this.IsOutsideDragZone(e.Location))
{
CancelListBoxItemDragEventArgs args;
args = new CancelListBoxItemDragEventArgs(this.DragIndex);
this.OnItemDragging(args);
if (!args.Cancel)
{
this.IsDragging = true;
this.DoDragDrop(this.DragIndex, DragDropEffects.Move);
}
}
base.OnMouseMove(e);
}
