public void OnConnectionDragging(Point currentDragPoint, ConnectionViewModel connection)
{
// If current drag point is close to an input connector, show its snapped position.
ConnectorViewModel nearbyConnector = null;
if (connectingTo)
{
nearbyConnector = FindNearbyInputConnector(connection, currentDragPoint);
}
else
{
nearbyConnector = FindNearbyOutputConnector(connection, currentDragPoint);
}
Point pnt = (nearbyConnector != null)
? nearbyConnector.Position
: currentDragPoint;
if (connectingTo)
{
connection.ToPosition = pnt;
}
else
{
connection.FromPosition = pnt;
}
}
public ConnectionViewModel OnConnectionDragStarted(ConnectorViewModel sourceConnector, Point currentDragPoint)
{
if (sourceConnector is OutputConnectorViewModel)
{
connectingTo = true;
var connection = new ConnectionViewModel((OutputConnectorViewModel)sourceConnector)
{
ToPosition = currentDragPoint
};
Connections.Add(connection);
return(connection);
}
else if (sourceConnector is InputConnectorViewModel)
{
connectingTo = false;
var connection = new ConnectionViewModel((InputConnectorViewModel)sourceConnector)
{
FromPosition = currentDragPoint
};
if (((InputConnectorViewModel)sourceConnector).Connection != null)
{
Connections.Remove(((InputConnectorViewModel)sourceConnector).Connection);
}
Connections.Add(connection);
return(connection);
}
return(null);
}
public void OnConnectionDragCompleted(Point currentDragPoint,
ConnectionViewModel newConnection,
ConnectorViewModel sourceConnector)
{
this.currentDragPoint = currentDragPoint;
if (connectingTo)
{
InputConnectorViewModel nearbyConnector = FindNearbyInputConnector(newConnection, currentDragPoint);
if (nearbyConnector == null)
{
RequestNodePickerWindow(newConnection);
// pick
return;
}
if (nearbyConnector == null || sourceConnector.Element == nearbyConnector.Element)
{
Connections.Remove(newConnection);
return;
}
ConnectionViewModel existingConnection = nearbyConnector.Connection;
if (existingConnection != null)
{
Connections.Remove(existingConnection);
}
newConnection.To = nearbyConnector;
}
else
{
OutputConnectorViewModel nearbyConnector = FindNearbyOutputConnector(newConnection, currentDragPoint);
foreach (ConnectionViewModel con in Connections.Where(c => c.To == newConnection.To && c.From != null).ToList())
{
Connections.Remove(con);
}
if (nearbyConnector == null)
{
RequestNodePickerWindow(newConnection);
// pick
return;
}
if (nearbyConnector == null || sourceConnector.Element == nearbyConnector.Element)
{
Connections.Remove(newConnection);
return;
}
newConnection.From = nearbyConnector;
}
}
private OutputConnectorViewModel FindNearbyOutputConnector(ConnectionViewModel connection, Point mousePosition)
{
return(Elements.SelectMany(x => x.OutputConnectors).Where(x => x.IOType == (connection.To == null ? connection.From.IOType : connection.To.IOType))
.FirstOrDefault(x => AreClose(x.Position, mousePosition, 10)));
}
internal void SetCurrentConnectionContext(ConnectionViewModel context)
{
contextConnection = context;
SearchBox = "";
}