public void OnConnectionDragging(Point currentDragPoint, ConnectionViewModel connection)
{
// If current drag point is close to an input connector, show its snapped position.
var nearbyConnector = FindNearbyInputConnector(currentDragPoint);
connection.ToPosition = nearbyConnector?.Position ?? currentDragPoint;
}
public ConnectionViewModel OnConnectionDragStarted(ConnectorViewModel sourceConnector, Point currentDragPoint)
{
if (!(sourceConnector is OutputConnectorViewModel))
{
return(null);
}
var connection = new ConnectionViewModel((OutputConnectorViewModel)sourceConnector)
{
ToPosition = currentDragPoint
};
Connections.Add(connection);
return(connection);
}
public void OnConnectionDragCompleted(Point currentDragPoint, ConnectionViewModel newConnection, ConnectorViewModel sourceConnector)
{
var nearbyConnector = FindNearbyInputConnector(currentDragPoint);
if (nearbyConnector == null || sourceConnector.Element == nearbyConnector.Element)
{
Connections.Remove(newConnection);
return;
}
var existingConnection = nearbyConnector.Connection;
if (existingConnection != null)
{
Connections.Remove(existingConnection);
}
newConnection.To = nearbyConnector;
}