private static void TargetChanged(object sender, DependencyPropertyChangedEventArgs e)
{
DependencyObject Element = sender as DependencyObject;
IDragDropTarget NewTarget = e.NewValue as IDragDropTarget;
IDragDropTarget CurrentTarget = e.OldValue as IDragDropTarget;
if (Element is UIElement || Element is ContentElement)
{
if (CurrentTarget != null)
{
DragDropTargetAdapter Adapter;
DragDrop.dragDropTargets.TryGetValue(Element, out Adapter).DbC_Assure(isSuccess => isSuccess);
DragDrop.dragDropTargets.Remove(Element);
Adapter?.Dispose();
}
if (NewTarget != null)
{
DragDropTargetAdapter Adapter = DragDropTargetAdapter.Create(NewTarget, Element, true);
DragDrop.dragDropTargets.Add(Element, Adapter);
}
}
else
{
throw new InvalidOperationException("Drag and Drop target can only be registered on UIElements and ContentElements");
}
}
/*
* private CustomPopupPlacement[] HandlePopupPlacement(Size popupsize, Size targetsize, Point offset)
* {
* Point Position = this.dragLocation;
* Position.Offset(offset.X, offset.Y);
* return new[] { new CustomPopupPlacement(Position, PopupPrimaryAxis.None), };
* }*/
private void DragEnter(object sender, DragEventArgs e)
{
DragDropEffects Effect = this.GetDropEffect(e.AllowedEffects, e.KeyStates, e.Data);
this.HandleDragStart(DragDropTargetAdapter.ToDropEffect(Effect));
this.HandleDragUpdate(DragDropTargetAdapter.ToDropEffect(Effect), new DragPosition(e));
e.Effects = Effect;
e.Handled = true;
}
private void Drop(object sender, DragEventArgs e)
{
e.Effects = this.GetDropEffect(e.AllowedEffects, e.KeyStates, e.Data);
DragDropEffects DropEffects = this.GetDropEffect(e.Effects, e.KeyStates, e.Data);
this.targetHandler.DoDrop(e.Data, DragDropTargetAdapter.ToDropEffect(DropEffects), this.dragTargetHandler.GetAdditionalDropInfo(new DragPosition(e)));
e.Handled = true;
this.HandleDragEnd();
}
private void DragOver(object sender, DragEventArgs e)
{
DragDropEffects Effect = this.GetDropEffect(e.AllowedEffects, e.KeyStates, e.Data);
e.Effects = Effect;
e.Handled = true;
this.HandleDragUpdate(DragDropTargetAdapter.ToDropEffect(Effect), new DragPosition(e));
/*Window Window = Window.GetWindow(this.target);
* this.dragLocation = Window.PointToScreen(e.GetPosition(Window));
* this.popup.PrivateMembers().Call("Reposition");*/
}
