/// <summary>
/// Determines whether the drop command can be executed
/// </summary>
/// <param name="param">The param.</param>
/// <returns>
/// <c>true</c> if this instance [can drop func] the specified param; otherwise, <c>false</c>.
/// </returns>
private bool CanDropFunc(object param)
{
bool canDrop = false;
System.Windows.DragEventArgs args = param as System.Windows.DragEventArgs;
TraceLab.UI.WPF.EventArgs.DropLinkEventArgs linkArgs = param as TraceLab.UI.WPF.EventArgs.DropLinkEventArgs;
if (IsExperimentRunning == false)
{
var sourceNode = linkArgs.Source as ExperimentNode;
var targetNode = linkArgs.Target as ExperimentNode;
canDrop |= (linkArgs != null &&
IsValidLinkSource(sourceNode) &&
(linkArgs.ExistingEdge != null || IsValidLinkTarget(targetNode)));
if (sourceNode != null && targetNode != null)
{
canDrop &= sourceNode.Owner == targetNode.Owner;
}
canDrop |= (args != null && args.Data.GetDataPresent("ComponentDefinition"));
}
else
{
if (args != null)
{
args.Effects = System.Windows.DragDropEffects.None;
}
}
return(canDrop);
}
/// <summary>
/// Executes drop
/// </summary>
/// <param name="param">The param.</param>
private void DropFunc(object param)
{
if (IsExperimentRunning == false)
{
TraceLab.UI.WPF.EventArgs.GraphDragEventArgs args = param as TraceLab.UI.WPF.EventArgs.GraphDragEventArgs;
TraceLab.UI.WPF.EventArgs.DropLinkEventArgs linkArgs = param as TraceLab.UI.WPF.EventArgs.DropLinkEventArgs;
if (args != null)
{
MetadataDefinition metadataDefinition = args.DragArguments.Data.GetData("ComponentDefinition") as MetadataDefinition;
if (metadataDefinition != null)
{
System.Windows.Point pos = args.Position;
AddComponentFromDefinition(metadataDefinition, pos.X, pos.Y);
}
}
else if (linkArgs != null)
{
ExperimentNodeConnection edge = (ExperimentNodeConnection)linkArgs.ExistingEdge;
// If we're NOT removing an edge, OR the new edge will be different than the old edge.
if (linkArgs.ExistingEdge == null || (edge.Source == linkArgs.Source && edge.Target != linkArgs.Target))
{
if (linkArgs.ExistingEdge != null)
{
RemoveConnection(edge);
}
if (linkArgs.Source != null && linkArgs.Target != null)
{
AddConnection((ExperimentNode)linkArgs.Source, (ExperimentNode)linkArgs.Target);
}
}
}
}
}
