public NodeConnection Connect(NodeConnector from, NodeConnector to, string name)
{
if (from != null)
{
foreach (var other in from.Node.Connections)
{
if (other.From == from &&
other.To == to)
{
return(null);
}
}
}
if (to != null)
{
foreach (var other in to.Node.Connections)
{
if (other.From == from &&
other.To == to)
{
return(null);
}
}
}
var connection = new NodeConnection();
connection.From = from;
connection.To = to;
connection.Name = name;
if (from != null)
{
from.Node.AddConnection(connection);
}
if (to != null)
{
to.Node.AddConnection(connection);
}
if (ConnectionAdded != null)
{
var eventArgs = new AcceptNodeConnectionEventArgs(connection);
ConnectionAdded(this, eventArgs);
if (eventArgs.Cancel)
{
Disconnect(connection);
return(null);
}
}
UpdateRevisionIndex();
if (InvalidateViews != null)
{
InvalidateViews(this, EventArgs.Empty);
}
return(connection);
}
public bool ConnectionIsAllowed(NodeConnector from, NodeConnector to)
{
if (null != CompatibilityStrategy)
{
if (CompatibilityStrategy.CanConnect(from, to) == ConnectionType.Incompatible)
{
return(false);
}
}
// If someone has subscribed to the ConnectionAdding event,
// give them a chance to interrupt this connection attempt.
if (null != ConnectionAdding)
{
// Populate a temporary NodeConnection instance.
var connection = new NodeConnection();
connection.From = from;
connection.To = to;
// Fire the event and see if someone cancels it.
var eventArgs = new AcceptNodeConnectionEventArgs(connection);
ConnectionAdding(this, eventArgs);
if (eventArgs.Cancel)
{
return(false);
}
}
return(true);
}
public bool Disconnect(NodeConnection connection)
{
if (connection == null)
{
return(false);
}
if (ConnectionRemoving != null)
{
var eventArgs = new AcceptNodeConnectionEventArgs(connection);
ConnectionRemoving(this, eventArgs);
if (eventArgs.Cancel)
{
return(false);
}
}
// if (HasFocus(connection))
// FocusElement = null;
var from = connection.From;
var to = connection.To;
if (from != null && from.Node != null)
{
from.Node.RemoveConnection(connection);
}
if (to != null && to.Node != null)
{
to.Node.RemoveConnection(connection);
}
// Just in case somebody stored it somewhere ..
connection.From = null;
connection.To = null;
if (ConnectionRemoved != null)
{
ConnectionRemoved(this, new NodeConnectionEventArgs(from, to, connection));
}
UpdateRevisionIndex();
if (InvalidateViews != null)
{
InvalidateViews(this, EventArgs.Empty);
}
return(true);
}
void OnConnectionRemoved(object sender, AcceptNodeConnectionEventArgs e)
{
ShaderFragmentNodeUtil.InvalidateShaderStructure(graphControl);
}
void OnConnectionAdding(object sender, AcceptNodeConnectionEventArgs e)
{
}
void OnConnectionAdded(object sender, AcceptNodeConnectionEventArgs e)
{
e.Connection.Name = "Connection " + counter ++;
ShaderFragmentNodeUtil.InvalidateShaderStructure(graphControl);
}
public bool Disconnect(NodeConnection connection)
{
if (connection == null)
return false;
if (ConnectionRemoving != null)
{
var eventArgs = new AcceptNodeConnectionEventArgs(connection);
ConnectionRemoving(this, eventArgs);
if (eventArgs.Cancel)
return false;
}
if (HasFocus(connection))
FocusElement = null;
var from = connection.From;
var to = connection.To;
if (from != null && from.Node != null)
{
from.Node.connections.Remove(connection);
}
if (to != null && to.Node != null)
{
to.Node.connections.Remove(connection);
}
// Just in case somebody stored it somewhere ..
connection.From = null;
connection.To = null;
if (ConnectionRemoved != null)
ConnectionRemoved(this, new NodeConnectionEventArgs(from, to, connection));
this.Invalidate();
return true;
}
public NodeConnection Connect(NodeConnector from, NodeConnector to)
{
if (from == null || to == null ||
from.Node == null || to.Node == null ||
!from.Enabled ||
!to.Enabled)
return null;
foreach (var other in from.Node.connections)
{
if (other.From == from &&
other.To == to)
return null;
}
foreach (var other in to.Node.connections)
{
if (other.From == from &&
other.To == to)
return null;
}
var connection = new NodeConnection();
connection.From = from;
connection.To = to;
from.Node.connections.Add(connection);
to.Node.connections.Add(connection);
if (ConnectionAdded != null)
{
var eventArgs = new AcceptNodeConnectionEventArgs(connection);
ConnectionAdded(this, eventArgs);
if (eventArgs.Cancel)
{
Disconnect(connection);
return null;
}
}
return connection;
}
/// <summary>
/// Checks whether the connection between two connectors is allowed.
/// This is achieved through event propagation.
/// </summary>
/// <returns></returns>
private bool ConnectionIsAllowed(NodeConnector from, NodeConnector to)
{
if (HighlightCompatible && null != CompatibilityStrategy)
{
if (CompatibilityStrategy.CanConnect(from, to) == ConnectionType.Incompatible)
return false;
}
// If someone has subscribed to the ConnectionAdding event,
// give them a chance to interrupt this connection attempt.
if (null != ConnectionAdding)
{
// Populate a temporary NodeConnection instance.
var connection = new NodeConnection();
connection.From = from;
connection.To = to;
// Fire the event and see if someone cancels it.
var eventArgs = new AcceptNodeConnectionEventArgs(connection);
ConnectionAdding(this, eventArgs);
if (eventArgs.Cancel)
return false;
}
return true;
}
public NodeConnection Connect(NodeConnector from, NodeConnector to, string name)
{
if (from != null)
{
foreach (var other in from.Node.Connections)
{
if (other.From == from &&
other.To == to)
return null;
}
}
if (to != null)
{
foreach (var other in to.Node.Connections)
{
if (other.From == from &&
other.To == to)
return null;
}
}
var connection = new NodeConnection();
connection.From = from;
connection.To = to;
connection.Name = name;
if (from != null)
from.Node.AddConnection(connection);
if (to != null)
to.Node.AddConnection(connection);
if (ConnectionAdded != null)
{
var eventArgs = new AcceptNodeConnectionEventArgs(connection);
ConnectionAdded(this, eventArgs);
if (eventArgs.Cancel)
{
Disconnect(connection);
return null;
}
}
UpdateRevisionIndex();
if (InvalidateViews != null)
InvalidateViews(this, EventArgs.Empty);
return connection;
}
