protected override void OnAttached()
{
base.OnAttached();
AssociatedObject.AllowDrop = true;
AssociatedObject.DragOver += (s, e) =>
{
if ((DropCommand?.CanExecute(DragDropManager.DragData)).GetValueOrDefault())
{
e.Effects = DragDropEffects.Move;
}
else
{
e.Effects = DragDropEffects.None;
}
e.Handled = true;
};
AssociatedObject.Drop += (s, e) =>
{
if ((DropCommand?.CanExecute(DragDropManager.DragData)).GetValueOrDefault())
{
DropCommand?.Execute(GetConvertedData(DragDropManager.DragData));
}
e.Handled = true;
};
}
private void HACK_Control_PreviewMouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
DropLinkEventArgs args = null;
if (PotentialLinkSource != null)
{
object target = PotentialLinkTarget != null ? PotentialLinkTarget.Vertex : null;
object edge = LinkBeingMoved != null ? LinkBeingMoved.Edge : null;
args = new DropLinkEventArgs(PotentialLinkSource.Vertex, target, edge);
LinkBeingMoved = null;
}
if (args != null && DropCommand.CanExecute(args))
{
/// checking if Target is different HACK_NODE is related to hard to reproduce error
/// somehow when you drag a link quickly to the existing node, but you don't really reach it or you are too far from node, then the target appears to be HACK_NODE
if (args.Target == null || (args.Target != null && args.Target.ToString().Equals("HACK_Node") == false))
{
DropCommand.Execute(args);
}
}
CancelAllDragging();
}
private bool IsValidDropTarget(IDataObject dataObject)
{
if (DropCommand == null)
{
return(false);
}
return(DropCommand.CanExecute(GetObjectFromData(dataObject)));
}
private void MultiSelectDataGrid_Drop(object sender, DragEventArgs e)
{
if (e.Data.GetDataPresent(DataFormats.StringFormat) &&
DropCommand != null &&
DropCommand.CanExecute(e.Data.GetData(DataFormats.StringFormat)))
{
DropCommand.Execute(e.Data.GetData(DataFormats.StringFormat));
}
if (DropDataCommand != null && DropDataCommand.CanExecute(e.Data))
{
DropDataCommand.Execute(e.Data);
}
}
void HACK_Control_PreviewMouseMove(object sender, MouseEventArgs e)
{
Point clickPoint = e.GetPosition(GraphLayout);
DependencyObject obj = (DependencyObject)GraphLayout.InputHitTest(clickPoint);
GraphSharp.Controls.VertexControl parent = null;
if (obj != null)
{
parent = obj.GetParent <GraphSharp.Controls.VertexControl>(this);
}
if (parent != null && parent != PotentialLinkSource && DropCommand.CanExecute(new DropLinkEventArgs(PotentialLinkSource.Vertex, parent.Vertex, null)))
{
PotentialLinkTarget = parent;
}
else
{
PotentialLinkTarget = null;
}
}
void IDropable.Drop(object data, DropLocation location)
{
var droppedElement = data as NodeItem;
if (droppedElement == null)
{
return;
}
var arg = new NodeDropRequest
{
DroppedNode = droppedElement.State.DataContext,
DropTarget = Root,
Location = location
};
if (DropCommand != null && DropCommand.CanExecute(arg))
{
DropCommand.Execute(arg);
}
}
