public void ClearDragSources()
{
foreach (var item in DragSources)
{
UnregisterDragCaptureZoneEvents(item);
}
DragSources.Clear();
}
public void RemoveDragSource(IDragSource dragSource)
{
if (!DragSources.Contains(dragSource))
{
throw new Exception("Элемент не найден");
}
DragSources.Remove(dragSource);
UnregisterDragCaptureZoneEvents(dragSource);
}
public void RegisterDragSource(IDragSource dragSource)
{
if (DragSources.Contains(dragSource))
{
throw new Exception("Элемент уже был зарегистрирован ранее");
}
DragSources.Add(dragSource);
RegisterDragCaptureZoneEvents(dragSource);
}
private bool InitDrag(Control c, DragSources dragSource)
{
if (!base.BeginDrag(c))
{
return(false);
}
m_dragSource = dragSource;
DropTarget.Clear();
return(true);
}
private IDragSource FindParentSelectedDragSource(IDragSource dragSource)
{
DependencyObject parent = dragSource.Instanse.Parent;
while (parent != null)
{
var parentDragSource = parent as IDragSource;
if ((parentDragSource != null) && parentDragSource.IsSelected &&
DragSources.Contains(parentDragSource))
{
return(parentDragSource);
}
parent = VisualTreeHelper.GetParent(parent);
}
return(null);
}
/// <summary>
/// Trigerred when the seconds hand is started for being dragged
/// </summary>
/// <param name="args">The drag event arguments</param>
protected void SecondsHand_DragStart(DragEventArgs args)
{
//Set the current drag source to seconds hand so that Clock_DragOver operates on it
DragSource = DragSources.SecondsHand;
}